CHA16 Series
Service Literature
Corp. 9121-L7
Revised 02/99
CHA16
2 to 5 TON
CHA16 SERIES UNITS 2 THROUGH 5 TON UNITS
CHA16 series units in the 2-5 ton sizes were introduced in
the spring of 1990. The single package cooling units may
be used in both residential and commercial applications.
Electric heat is available in several Kw sizes. Units are de
signed for rooftop or side of building installation with either
bottom or horizontal discharge.
All specifications in this manual are subject to change.
For commercial applications, the CHA16 is designed to
accept any of several different thermostat control systems
with minimum field wiring. Control options such as econo
mizer, warm up kit, Honeywell W973 control or Honeywell
W7400 control connect to the unit with jack-plugs. When
plugged in the controls become an integral part of the unit
wiring. Commercial units are also equipped with a low volt
age terminal strip to facilitate thermostat field wiring.
TABLE OF CONTENTS
III -
III -
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 24
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
Accessory Air Resistance Data . . . . . . . . . . . . . . . . . . . . . Page 5
Diffuser Air Resistance Data . . . . . . . . . . . . . . . . . . . . . . . Page 5
Blower Performance Data . . . . . . . . . . . . . . . . . . . . . . Pages 68
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
UNIT COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
Control Box Components . . . . . . . . . . . . . . . . . . . . . . Pages 913
Control Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Low Voltage Terminal Strip . . . . . . . . . . . . . . . . . . . . . . . Page 11
Low Voltage Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Cooling Contactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
575 Volt Autotransformer . . . . . . . . . . . . . . . . . . . . . . . . Page 12
Indoor Blower Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
Potential Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
Start Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
Dual Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
Compressor Run Capacitor . . . . . . . . . . . . . . . . . . . . . . Page 13
Condenser Fan Capacitor . . . . . . . . . . . . . . . . . . . . . . . Page 13
Cooling Components . . . . . . . . . . . . . . . . . . . . . . . . Pages 1317
Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Loss of Charge Switch . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16
Thermometer Well . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17
Fan and Blower Components . . . . . . . . . . . . . . . . . Pages 1718
Condenser Fan and Motor . . . . . . . . . . . . . . . . . . . . . . . Page 17
Condenser Fan Motor Capacitor . . . . . . . . . . . . . . . . . . Page 17
Blower Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 17,18
Blower Motor Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
OPTIONAL ECH16 ELECTRIC HEAT . . . . . . . . . . . . . Page 18
Matchups and Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 1829
Conventional Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
Electric Heat Specification Tables . . . . . . . . . . . . . . Pages 1923
Electric Heat Parts Arrangements . . . . . . . . . . . . . Pages 2427
Thermal Heat Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27
Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
Pilot Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
Time Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
Current Limiting Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
Primary High Temperature Limit . . . . . . . . . . . . . . . Pages 28,29
Secondary High Temperature Limit . . . . . . . . . . . . . . . Page 29
Thermal Cutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29
Heating Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29
PLACEMENT AND INSTALLATION . . . . . . . . . . . . . . . Page 30
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . Page 30
STARTUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30
REFRIGERATION SYSTEM SERVICE CHECKS Pages 30,31
Gauge Manifold Attachment . . . . . . . . . . . . . . . . . . . . . Page 30
Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 3031
VIII - BLOWER OPERATION AND ADJUSTMENT . . . . . . Page 32
Blower Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 32
Determining Unit CFM . . . . . . . . . . . . . . . . . . . . . . . . . . Page 32
Blower Speed Adjustment . . . . . . . . . . . . . . . . . . . . Pages 3235
IX - MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 35
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 35
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
X - ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
Lifting Lugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
RMF16 Roof Mounting Frame . . . . . . . . . . . . . . . . . Pages 3637
Economizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 3746
Condenser Coil Guard Kit . . . . . . . . . . . . . . . . . . . . . . . Page 46
Compressor Crankcase Heater . . . . . . . . . . . . . . . . . . Page 46
DF16 Downflow Filter Kit . . . . . . . . . . . . . . . . . . . . . . . . Page 46
Timedoff Control Kit . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46,47
Optional Compressor Monitor . . . . . . . . . . . . . . . . . Pages 46,48
Low Ambient Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 49,50
Roof Curb Power Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 51
Transitions and Supply/Return Diffusers . . . . . . . . . . . Page 51
Status Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 5160
XI - FIELD WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 6167
XII - WIRING DIAGRAMS AND SEQUENCE OF OPERATION
Wiring Diagrams and Sequence of Operation . . Pages 68-101
Basic Residential Unit with Basic Thermostat . . . Pages 68,69
CHA16H with ThreePosition Economizer . . . . . . Pages 70,71
CHA16H with Modulating Economizer . . . . . . . . . . Pages 72,73
Basic SinglePhase Commercial Unit . . . . . . . . . . Pages 74,75
Basic 208/230V ThreePhase Commercial Unit . . Pages 75,76
Basic 460V or 575V Commercial Unit . . . . . . . . . . Pages 78,79
Basic ThreePosition Economizer Operation . . . . Pages 80,81
Basic Modulating Economizer Operation . . . . . . . Pages 82,83
Warm Up Kit Operation with 3Position Econ . . . . Pages 84,85
Warm Up Kit Operation with Modulating Econ . . . Pages 85,86
Night Kit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 87,88
Electric Heat Operation . . . . . . . . . . . . . . . . . . . . . Pages 90101
IV VVI VII -
Page 1
 1991 Lennox Industries Inc.
Litho U.S.A.
SPECIFICATIONS
CHA16H RESIDENTIAL HORIZONTAL ONLY UNITS
Model No.
CHA16H-261
CHA16H-311
7.8
23,200
7.8
28,600
2650
9.8
250
9.70
8.7
2 lbs. 12 oz.
8.80
3 lbs. 10 oz.
9x7
1/3
9x8
1/3
600 - 1000
3.20
3/8 - 2
750 - 1250
3.20
3/8 - 2
15
6.80
17
6.80
Tube diameter (in.) & Number of rows
Fins per inch
3/8 - 1
20
3/8 - 1.60
20
Diameter (in.) & Number of blades
Air volume (cfm)
18 - 4
2100
18 - 4
2000
1/6
200
3/4
1/6
160
3/4
♦ARI Standard 270 SRN (bels)
*ARI
Standard
210
Ratings
Total Cooling Capacity (Btuh)
Total unit watts
SEER (Btuh/Watts)
EER (Btuh/Watts)
Refrigerant (R-22) charge
Evaporator
Blower
Evaporator
Coil
Condenser
Coil
Condenser
Blower wheel nominal diameter x width (in.)
Motor horsepower
Air volume range (cfm)
Net face area (sq. ft.)
Tube diameter (in.) & Number of rows
Fins per inch
Net face area (sq. ft.)
Motor horsepower
Motor watts
Condensate drain size mpt (in.)
Fan
Electrical characteristics
Optional
Electric
Heat
Ratings
ECH16R-5
Output Btuh
•A.F.U.E.
19,000
99.0%
ECH16R-7
Output Btuh
•A.F.U.E.
ECH16R-10
Output Btuh
•A.F.U.E.
25,000
99.0%
35,000
Output Btuh
•A.F.U.E.
ECH16-15
Line voltage data
Recommended max. fuse size (amps)
Minimum circuit ampacity
Optional Lifting Lug Kit
Optional Condenser Coil Guards
99.0%
99.0%
52,000
52,000
99.0%
99.0%
30
30
19.0
20.0
RDE16-41
(1) 20 x 24 x 1 (fiberglass)
Optional Roof Mounting Frame (used with RDE16-41 only)
Model
Optional
3 position
••Economizer
No.
Modulating
Number and size
of filters (in.)
Optional Ceiling Supply and
Return Air Diffusers
25,000
99.0%
35,000
LB-62125DB
LB-82199CA
Optional Duct Enclosure
Number and size of filters (in.)
Dampers
with Gravity Exhaust
208/230 volts - 60 hz - 1 phase
19,000
99.0%
RMF16-41
REMD16-41
REMD16M-41
♦♦(1) 16 x 25 x 1
Indoor
Outdoor
(1) 14 x 25 x 1 (aluminum mesh)
Step Down
RTD9-65
Flush
Transition
Optional Outdoor Air Dampers (manual)
FD9-65
SRTH16-65
OAD3-46/65
•Annual Fuel Utilization Efficiency based on DOE test procedures and FTC labeling regulations.
••Two stage cooling thermostat required with economizer applications.
♦Sound Rating Number in accordance with ARI Standard 270.
♦♦Indoor filter is not furnished and must be field provided.
*Rated in accordance with ARI Standard 210 and DOE; 95°F outdoor air temperature and 80°F db/67°F wb entering evaporator air.
**For LPG units a field changeover kit is required and must be ordered extra.
Page 2
SPECIFICATIONS
CHA16R RESIDENTIAL UNITS
CHA16R-411
CHA16R-511
CHA16R-651
7.8
34,000
8.0
46,500
8.0
56,000
Total unit watts
3910
5470
6665
SEER (Btuh/Watts)
9.60
9.50
9.4
Model No.
♦ARI Standard 270 SRN (bels)
*ARI
Standard
210
Ratings
Total Cooling Capacity (Btuh)
EER (Btuh/Watts)
Refrigerant (R-22) charge
Evaporator
Blower
Evaporator
Coil
Blower wheel nom. dia. x width (in.)
Motor horsepower
Air volume range (cfm)
Net face area (sq. ft.)
Tube dia. (in.) & Number of rows
Fins per inch
Net face area (sq. ft.)
Condenser
Coil
Outer coil
Inner coil
Tube dia. (in.) & Number of rows
Fins per inch
Diameter (in.) & Number of blades
8.70
8.50
8.40
4 lbs. 12 oz.
5 lbs. 9 oz.
7 lbs. 0 oz.
10 x 7
10 x 8
12 x 8
1/3
1/2
3/4
900 - 1500
1200 - 2000
1500 - 2500
4.10
5.80
5.80
3/8 - 2
3/8 - 2
3/8 - 2
15
15
15
8.60
14.30
14.30
8.40
5.90
13.80
3/8 - 2
3/8 - 1.4
3/8 - 2
20
20
20
20 - 4
24 - 4
24 - 4
2200
4000
3600
Condenser
Air volume (cfm)
Fan
Motor horsepower
1/6
1/4
1/4
Motor watts
220
340
360
Condensate drain size mpt (in.)
3/4
3/4
3/4
Line voltage Recommended max. fuse size (amps)
data
Minimum circuit ampacity
45
60
60
27.0
36.0
42.0
208/230 volts - 60 hz - 1 phase
-----
-----
----27,000
99.0%
37,000
----27,000
99.0%
37,000
Electrical characteristics
Optional
Electric
Heat
Ratings
ECH16R-5
Output Btuh
•A.F.U.E.
19,000
99.0%
ECH16R-7
Output Btuh
•A.F.U.E.
ECH16R-10
Output Btuh
•A.F.U.E.
26,000
99.0%
36,000
ECH16-15
Output Btuh
•A.F.U.E.
ECH16R-10
Output Btuh
•A.F.U.E.
ECH16-15
Output Btuh
•A.F.U.E.
Optional Downflow Adaptor Kit Model no, Filters
99.0%
99.0%
99.0%
53,000
54,000
54,000
99.0%
70,000
99.0%
71,000
99.0%
71,000
99.0%
99.0%
99.0%
-----
88,000
88,000
-----
99.0%
99.0%
DF16-41, (1)16x25x1
(polyurethane)
Optional Lifting Lug Kit
Optional Condenser Coil Guards
Optional Outdoor Air Dampers (manual)
DF16-65, (1) 20x25x1
(polyurethane)
LB-62125DB
LB-82199CB
LB-82199CC
OAD16-41
OAD16-65
•Annual Fuel Utilization Efficiency based on DOE test procedures and FTC labeling regulations.
♦Sound Rating Number in accordance with ARI Standard 270.
*Rated in accordance with ARI Standard 210 and DOE; 95°F outdoor air temperature and 80°F db/67°F wb entering evaporator air.
**For LPG units a field changeover kit is required and must be ordered extra.
Page 3
SPECIFICATIONS - CHA16 COMMERCIAL UNITS
Model No.
CHA16-411 CHA16-413
♦ARI Standard 270 SRN (bels)
Total Cooling Capacity (Btuh)
*ARI
Total unit watts
Standard
SEER (Btuh/Watts)
210
Ratings
EER (Btuh/Watts)
Refrigerant (R-22) charge
Evaporator Blower wheel nominal dia. x width (in.)
Motor horsepower
Blower
Air volume range (cfm)
Evaporator Net face area (sq. ft.)
Coil
Tube dia. (in.) & No of rows & Fins/in.
Condenser Net face area (sq. ft.) outer/inner
Tube diameter (in.) & Number of rows
Coil
Fins per inch
Condenser Diameter (in.) & Number of blades
Air volume (cfm)
Fan
Motor horsepower & Motor watts
Condensate drain size mpt (in.)
1 ph
Recommended max. 208/230v
3 ph
Line voltage fuse size (amps)
460v - 3 ph
Data
1 ph
Minimum circuit
208/230v
(60hz)
3 ph
ampacity
460v - 3 ph
Electrical characteristics
Output Btuh
ECH16R-5
•A.F.U.E.
Output Btuh
ECH16R-7
•A.F.U.E.
Output Btuh
ECH16R-10
Optional
•A.F.U.E.
Electric
Output Btuh
Heat
ECH16-15
•A.F.U.E.
Ratings
Output Btuh
ECH16R-10
•A.F.U.E.
Output Btuh
ECH16-15
•A.F.U.E.
Lifting Lugs (Brackets)
Optional Condenser Coil Guards
Number and Size of Filters (in.)
Optional Roof Mounting Frame
3 position
Optional
Model No. Modulating
Economizer
Indoor
No. & size
Dampers
of filters (in.) Outdoor
3 position
Optional
Horizontal
Modulating
Model No.
Economizer
Indoor
No. & size
Dampers
of filters (in.) Outdoor
Optional Outdoor Air Dampers (manual)
Step Down
Optional Ceiling Supply and
Flush
Return Air Diffusers
Transition
CHA16-511 CHA16-513
CHA16-651 CHA16-653
8.0
8.0
7.8
34,000
56,000
46,500
3910
6665
5470
9.50
9.60
9.40
8.70
8.40
8.50
4 lbs. 12 oz.
7 lbs. 0 oz.
5 lbs. 9 oz.
12 x 8
10 x 8
10 x 7
1/3
3/4
1/2
900 - 1500
1500 - 2500
1200 - 2000
4.10
5.80
5.80
3/8 - 2 - 15
3/8 - 2 - 15
3/8 - 2 - 15
8.60/8.40
14.30/13.80
14.30/5.90
3/8 - 2
3/8 - 2
3/8 - 1.40
20
20
20
20 - 4
24 - 4
24 - 4
2200
4000
3600
1/6 - 240
1/4 - 360
1/4 - 340
3/4
3/4
3/4
45
60
60
30
40
45
15
20
25
42.0
27.0
36.0
20.0
26.0
29.0
10.0
14.0
16.0
208/230 volts - 60 hz - 1 or 3 phase 460 or 575 volts - 3 phase
--------19,000
99.0%
--------27,000
26,000
27,000
99.0%
99.0%
99.0%
37,000
36,000
37,000
99.0%
99.0%
54,000
54,000
99.0%
99.0%
71,000
71,000
99.0%
99.0%
88,000
88,000
99.0%
99.0%
◊Furnished, Factory Installed
LB-82199CC
(1) 20x25x1 (polyurethane)
RMF16-41 or RMF16-65
REMD16-65
REMD16M-65
(1) 18 x 25 x 1 (polyurethane)
(1) 18 x 25 x 1 (aluminum mesh)
EMDH16-65
EMDH16M-65
(1) 16 x 25 x 1 & (1) 14 x 25 x 1 (fiber glass)
(1) 8 x 28 x 1 (aluminum mesh)
OAD16-65
RTD9-65
FD9-65
SRT16-65
Electromechanical Thermostat
Honeywell W973 Control System with T7067 Thermostat
Honeywell W7400 Control System with T7400 Thermostat
Flexstat Thermostat (discontinued as an option after August 1989)
Prostat Thermostat
T7300 Thermostat
23H13
23H14
24H61
Furnished - Factory Installed
GEDH16-65 (use with EMDH16 or EMDHM16)
18H70 (1/2")
99.0%
53,000
99.0%
70,000
99.0%
--------◊Furnished, Field Installed
LB-82199CB
(1)16x25x1 (polyurethane)
RMF16-41
REMD16-41
REMD16M-41
(1) 14 x 25 x 1 (polyurethane)
(1) 14 x 25 x 1 (aluminum mesh)
EMDH16-41
EMDH16M-41
(1) 20 x 24 x 1 (fiber glass)
(1) 8 x 24 x 1 (aluminum mesh)
OAD16-41
Optional Controls Selection
Downflow application
Optional Control Mounts
Horizontal application
••Commercial Controls
Optional Gravity Exhaust Dampers
Optional Roof Curb Power Entry Kit
•Annual Fuel Utilization Efficiency based on DOE test procedures and FTC labeling regulations.
••Furnished as standard.Consists of: factory installed controls wiring harness, high pressure switch, loss of charge switch, low voltage terminal strip and compressor crankcase heater.
♦Sound Rating Number in accordance with ARI Standard 270.
*Rated in accordance with ARI Standard 210 and DOE; 95°F outdoor air temperature and 80°F db/67°F wb entering evaporator air.
◊Older CHA16 series units use optional field installed lifting lug kit LB-62125DB.
Page 4
ELECTRICAL DATA
CHA16H-261-311 AND CHA16(R)-411-511-651 MODELS SINGLE PHASE VOLTAGE
Model No.
CHA16H261
CHA16H311
CHA16(R)-411
CHA16(R)-511
CHA16(R) -651
208/230v
12.1
57.0
.09
1.5
2.1
4.6
30
.99
19.0
208/230v
13.5
77.4
.90
1.5
2.1
4.6
30
.95
20.0
208/230v
17.9
83.5
1.1
2.2
3.0
6.2
40
.95
27.0
208/230v
23.4
118.0
2.3
4.4
3.9
8.3
50
.92
36.0
208/230v
27.6
135.0
2.3
4.4
4.6
10.0
60
.97
42.0
Line Voltage Data 60Hz. - 1ph
Rated Load Amps
Compressor
Locked Rotor Amps
Condenser
Full Load Amps
Fan Motor
Locked Rotor Amps
Full Load Amps
Evaporator
Blower
Locked Rotor Amps
•Recommended Max. Fuse Size (amps)
Unit Power Factor
*Minimum Circuit Ampacity
CHA16-413-513-653 MODELS THREE PHASE VOLTAGE
Model No.
CHA16413
Line Voltage Data 60Hz. - 3ph
Rated Load Amps
Compressor
Locked Rotor Amps
Condenser
Full Load Amps
Fan Motor
Locked Rotor Amps
Full Load Amps
Evaporator
Blower
Locked Rotor Amps
•Recommended Max. Fuse Size (amps)
Unit Power Factor
*Minimum Circuit Ampacity
208/230v
11.3
66.0
1.1
2.2
3.0
6.2
25
.86
19.0
460v
5.2
35.0
0.70
1.3
1.8
4.4
15
.87
9.0
CHA16513
208/230v
15.4
90.0
2.3
4.4
3.9
8.3
40
.88
26.0
575v
4.5
29.0
••0.7
••1.3
••1.8
••4.4
15
.86
9.0
460v
8.4
45.0
1.1
2.0
1.8
4.4
20
.88
14.0
CHA16653
575v
6.5
36.0
••1.1
••2.0
••1.8
••4.4
15
.88
12.0
208/230v
17.7
105
2.3
4.4
4.6
10.0
45
.89
30.0
460v
9.4
55
1.1
2.0
1.8
3.8
20
.89
15.0
575v
6.3
45.0
••1.1
••2.0
••1.8
••3.8
15
.89
11.0
•Where current does not exceed 60 amps, HACR circuit breaker may be used in place of fuse.
NOTE - Extremes of operating range are plus and minus 10% of line voltage.
*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements.
••Motors are rated at 460 volts. Full Load Amps shown are for stepdown transformer output.
CHA16-651/653-6 MODELS
CHA16-651
Model No.
Line Voltage Data - Phase
Rated Load Amps
Compressor
Locked Rotor Amps
Full Load Amps
Condenser
Fan Motor
Locked Rotor Amps
Full Load Amps
Evaporator
Blower
Locked Rotor Amps
•Recommended Max. Fuse Size (amps)
Unit Power Factor
*Minimum Circuit Ampacity
208/230v 1ph.
28.0
170.0
2.3
4.4
4.6
10.0
60
.97
42.0
CHA16-653
CHA16-653
208/230v 3ph.
17.2
124.0
2.3
4.4
4.6
10.0
45
.89
30.0
460v 3ph
8.3
60.0
1.1
2.0
1.8
3.8
20
.89
15.0
CHA16-653
575v 3ph.
6.6
47.7
•• 1.1
•• 2.0
•• 1.8
•• 3.8
15
.89
11.0
CHA16-653
380/420v 3ph.
•Where current does not exceed 60 amps, HACR circuit breaker may be used in place of fuse.
NOTE - Extremes of operating range are plus and minus 10% of line voltage.
*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements.
••Motors are rated at 460 volts. Full Load Amps shown are for stepdown transformer output.
ACCESSORY AIR RESISTANCE
Total Resistance (inches water gauge)
Unit
Model
No.
CHA16H-261
CHA16H-311
CHA16-410
CHA16-510
CHA16-650
Air
Volume
(cfm)
800
1000
1200
800
1000
1200
1400
1600
1800
2000
2200
EMDH16
Economizer
Downflow
REMD16 Downflow
Economizer
With
1" Filter
Without
Filter
.15
.18
.21
.15
.18
.21
.25
.20
.23
.27
.32
.05
.06
.09
.05
.06
.09
.15
.05
.06
.08
.10
NOTEElectric heaters have no appreciable air resistance.
◊With
With
With
Pleated Fiberglass
1" Filter
2" Filter 2" Filter
------.27
.34
.42
.51
.40
.48
.56
.66
------.25
.29
.36
.47
.36
.41
.47
.54
------.18
.26
.35
.46
.30
.35
.40
.47
*Air resistance is with air filter in place.
DF16 Downflow Filter Adaptor Kit
*RDE16-41
Without
Duct
Filter Enclosure
------.10
.15
.21
.29
.17
.19
.22
.26
.11
.19
.22
-----------------
With
1" Filter
------.15
.18
.21
.25
.15
.17
.20
.23
Wet
Evaporator
◊With
With
Coil
Pleated Fiberglass
2" Filter 2" Filter
------.27
.34
.42
.51
.35
.42
.49
.57
◊Air resistance is with pleated nonwoven cotton fabric filter.
Page 5
------.13
.18
.24
.31
.22
.27
.32
.37
.08
.09
.10
.08
.09
.10
.11
.09
.10
.11
.12
DIFFUSER AIR RESISTANCE
Unit
Model
Number
CHA16(R)511513 BLOWER PERFORMANCE @ 230VOLTS
(With Horizontal Supply and Return Air Openings)
RTD9-65 Diffuser
External Static
Air
Volume
(cfm)
2 Ends
Open
1 Side
2 Ends
Open
All Ends
& Sides
Open
800
.15
.13
.11
.11
1000
.19
.16
.14
.14
1200
.25
.20
.17
.17
800
.15
.13
.11
.11
1000
.19
.16
.14
.14
1200
.25
.20
.17
.17
1400
.33
.26
.20
.20
1600
.43
.32
.24
.24
CHA16510
1800
.56
.40
.30
.30
CHA16650
2000
.73
.50
.36
.36
2200
.95
.63
.44
.44
CHA16H261
CHA16H311
CHA16410
FD9-65
Diffus
er
High
Med-High
Med-Low
Low
0
1345
1000
880
710
.05
1320
995
870
705
.10
1290
995
855
695
.15
1265
985
845
690
.20
1240
975
830
680
.25
1210
960
815
670
.30
1180
940
795
.40
1120
895
.50
1055
840
Med-High
Med-Low
Low
0
2140
1785
1535
1305
.05
2115
1770
1530
1300
.10
2090
1755
1520
1295
.15
2070
1745
1510
1290
.20
2045
1730
1500
1285
.25
2020
1715
1490
1280
.30
1995
1700
1480
1275
.40
1935
1665
1460
1260
.50
1875
1630
1430
1235
.60
1800
1585
1400
1205
.70
1710
1530
1370
1170
.75
1655
1495
1355
1150
CHA16H311 BLOWER PERFORMANCE @ 230 VOLTS
(With Horizontal Supply and Return Air Openings)
External Static
Air Volume (cfm) @ Various Speeds
Pressure(in. wg)
High
NOTE- All cfm data is measured external to unit.
CHA16H261 BLOWER PERFORMANCE @ 230 VOLTS
(With Horizontal Supply and Return Air Openings)
External Static
Air Volume (cfm) @ Various Speeds
Pressure(in. wg)
Air Volume (cfm) @ Various Speeds
Pressure(in. wg)
High
Med-High
Med-Low
Low
0
1530
1065
905
720
.05
1505
1060
905
720
.10
1475
1050
905
720
.15
1450
1040
900
715
.20
1425
1030
900
715
.25
1400
1020
895
710
660
.30
1375
1010
890
705
760
630
.40
1310
980
865
680
710
585
.50
1240
940
825
645
1135
880
760
590
.60
975
570
645
525
.60
.70
880
525
565
450
.70
1025
800
670
515
.75
825
475
515
405
.75
975
750
610
465
NOTE- All cfm data is measured external to unit.
CHA16(R)411413 BLOWER PERFORMANCE @ 230VOLTS
(With Horizontal Supply and Return Air Openings)
External Static
NOTE- All cfm data is measured external to unit.
CHA16(R)411413 BLOWER PREFORMANCE @ 230VOLTS
(With Down-Flow Supply and Return Air Openings)
Air Volume (cfm) @ Various Speeds
External Static
Air Volume (cfm) @ Various Speeds
Pressure(in. wg)
High
Med-High
Med-Low
Low
Pressure(in. wg)
High
Med-High
Med-Low
Low
0
1490
1460
1145
920
0
1415
1350
1135
915
.05
1470
1440
1135
910
.05
1395
1335
1125
905
.10
1450
1420
1125
900
.10
1375
1315
1115
895
.15
1435
1395
1120
895
.15
1360
1290
1110
890
.20
1430
1375
1115
890
.20
1355
1275
1105
885
.25
1400
1375
1105
880
.25
1325
1255
1095
875
.30
1380
1355
1095
870
.30
1310
1235
1085
865
.40
1335
1335
1070
850
.40
1265
1195
1060
845
.50
1285
1285
1030
830
.50
1220
1155
1020
825
.60
1235
1235
985
790
.60
1170
1105
975
785
.70
1185
1140
935
730
.70
1115
1045
925
725
.75
1160
1110
905
690
.75
1085
1010
895
685
NOTE- All cfm data is measured external to unit.
NOTE- All cfm data is measured external to unit.
Page 6
CHA16(R)511513 BLOWER PERFORMANCE @ 230VOLTS
(With Down-Flow Supply and Return Air Openings)
External Static
Pressure(in. wg)
CHA16653 BLOWER PERFORMANCE @ 460/575 VOLTS
(With Horizontal Supply and Return Air Openings)
Air Volume (cfm) @ Various Speeds
High
Med-High
Med-Low
External Static
Air Volume @ Various Speeds
Low
Pressure (in. wg)
High
Medium
Low
0
2850
2430
1940
.05
2805
2385
1920
.10
2760
2345
1905
.15
2715
2310
1885
.20
2670
2275
1870
.25
2640
2240
1850
.30
2605
2210
1825
.40
2515
2140
1775
.50
2445
2120
1710
0
2065
1715
1515
1305
.05
2055
1705
1505
1300
.10
2040
1690
1495
1300
.15
2020
1680
1485
1295
.20
2000
1665
1475
1290
.25
1975
1650
1470
1285
.30
1950
1635
1450
1280
.40
1885
1600
1425
1260
.50
1810
1565
1395
1225
.60
2355
1990
1600
.60
1730
1525
1360
1175
.70
2270
1920
1590
1110
.75
2225
1880
1545
.70
.75
1645
1600
1600
1320
1455
1295
1070
NOTE- All cfm data is measured external to unit.
NOTE- All cfm data is measured external to unit.
CHA16413 BLOWER PERFORMANCE @ 460/575 VOLTS
(With Down-Flow Supply and Return Air Openings)
CHA16413 BLOWER PERFORMANCE @ 460/575 VOLTS
(With Horizontal Supply and Return Air Openings)
External Static
External Static
Air Volume @ Various Speeds
Pressure (in. wg)
High
Medium
Low
0
1710
1590
1105
.05
1685
1565
1105
10
1655
1535
1105
.15
1630
1510
1100
.20
1610
1490
1095
.25
1570
1470
1085
.30
1540
1445
1075
.40
1475
1385
1040
.50
1405
1330
1010
.60
1335
1260
960
.70
1240
1185
885
.75
1180
1150
825
NOTE- All cfm data is measured external to unit.
Pressure (in. wg)
High
Medium
Low
0
1625
1465
1100
.05
1600
1445
1100
.10
1570
1420
1100
.15
1455
1395
1095
.20
1525
1385
1090
.25
1485
1365
1075
.30
1465
1340
1070
.40
1400
1285
1035
.50
1335
1235
1005
.60
1260
1165
955
.70
1170
1085
875
.75
1100
1045
815
NOTE- All cfm data is measured external to unit.
CHA16513 BLOWER PERFORMANCE @ 460/575 VOLTS
(With Down-Flow Supply and Return Air Openings)
CHA16513 BLOWER PERFORMANCE @ 460/575 VOLTS
(With Horizontal Supply and Return Air Openings)
External Static
Air Volume @ Various Speeds
External Static
Air Volume @ Various Speeds
Air Volume @ Various Speeds
Pressure (in. wg)
High
Medium
Low
Pressure (in. wg)
High
Medium
Low
0
2160
1815
1210
0
2140
1745
1175
.05
2125
1800
1210
.05
2120
1730
1175
.10
2095
1790
1200
.10
2080
1720
1170
.15
2060
1780
1200
.15
2045
1710
1170
2005
1695
1165
.20
2025
1760
1195
.20
.25
1990
1745
1190
.25
1975
1680
1160
.30
1955
1730
1185
.30
1940
1665
1150
.40
1885
1690
1170
.40
1870
1625
1135
.50
1805
1640
1140
.50
1790
1580
1110
.60
1715
1575
1105
.60
1705
1515
1075
.70
1615
1495
1065
.70
1615
1430
1030
.75
1560
1445
1040
.75
1565
1375
1000
NOTE- All cfm data is measured external to unit.
NOTE- All cfm data is measured external to unit.
Page 7
CHA16653 BLOWER PERFORMANCE @ 460/575 VOLTS
(With Down-Flow Supply and Return Air Openings)
External Static
CHA16(R)651653 BLOWER [email protected] 230 VOLTS
(With Horizontal Supply and Return Air Openings)
External Static
Air Volume @ Various Speeds
Air Volume (cfm) @ Various Speeds
Pressure (in. wg)
High
Medium
Low
Pressure (in. wg)
High
Med-High
Med
Med-Low
Low
0
.05
2725
2680
2405
2365
1905
1890
0
.05
2850
2820
2530
2475
2255
2230
1970
1965
1640
1645
.10
2635
2325
1870
.10
2790
2475
2205
1955
1645
.15
2590
2290
1855
.15
2760
2455
2180
1940
1630
.20
2550
2255
1840
.20
2725
2435
2160
1925
1610
.25
2515
2220
1820
.25
2680
2405
2150
1910
1600
.30
2485
2190
1795
.30
2630
2375
2135
1895
1585
.40
2395
2120
1745
.40
2570
2315
2080
1860
1560
.50
2325
2050
1680
.50
2510
2270
2025
1795
1525
.60
2235
1970
1570
.60
2410
2180
1960
1755
1475
.70
2150
1900
1560
.70
2335
2115
1900
1690
1425
.75
2100
1860
1515
.75
2300
2070
1865
1650
1390
NOTE- All cfm data is measured external to unit.
NOTE- All cfm data is measured external to unit.
CHA16(R)651653 BLOWER [email protected] 230 VOLTS
(With Down-Flow Supply and Return Air Openings)
External Static
Pressure (in. wg)
0
.05
.10
.15
.20
.25
.30
.40
.50
.60
.70
.75
Air Volume (cfm) @ Various Speeds
High Med-High
Med
Med-Low Low
2725
2695
2665
2635
2600
2555
2510
2445
2385
2285
2210
2175
2490
2435
2430
2415
2395
2365
2335
2275
2230
2140
2075
2030
2235
2210
2185
2160
2140
2130
2115
2060
2005
1940
1880
1845
1940
1930
1925
1910
1895
1880
1865
1830
1765
1725
1660
1615
1620
1625
1625
1610
1590
1580
1565
1540
1505
1455
1405
1370
NOTE- All cfm data is measured external to unit.
CHA16-410 AND CHA16-510/650
PARTS ARRANGEMENT
CHA16H PARTS ARRANGEMENT
CONDENSER FAN
OPTIONAL
SUPPLY
OPTIONAL
RETURN
COMPRESSOR
CONTACTOR
OPTIONAL
ELECTRIC
HEAT
EVAPORATOR
COIL
SUPPLY
RETURN
DRAIN
CONTROL
BOX
SUPPLY
BLOWER
SUPPLY BLOWER
RETURN
EVAPORATOR COIL
FIGURE 1
Page 8
CONDENSER
COIL
COMPRESSOR
OPTIONAL
ELECTRIC
HEAT
CONTROL
BOX
I-APPLICATION
II-UNIT COMPONENTS
CHA16 2-5 ton units are available in three model and three
cabinet sizes (refer to the Engineering Handbook for more
specific application data). CHA16H models are available
only in the smallest cabinet and are applicable for residen
tial installations with horizontal supply and discharge air
only. CHA16H units are singlephase only and are not
equipped for installation of Lennox' optional thermostat
control systems. CHA16R models are residential only
units available in both the small and large convertible
(downflow or horizontal) cabinets. CHA16R models, like
the CHA16H models, are singlephase only and are not
equipped for installation of Lennox' optional thermostat
control systems. CHA16 models are residential or com
mercial units available in single or threephase and avail
able in both the small and large convertible (downflow or
horizontal) cabinets. CHA16 models are factory equipped
with the hardware required for installing Lennox' optional
thermostat control systems. Lennox' optional thermostat
control systems are the same controls, harnesses, and
harness plugs used in all 16 series commercial air condi
tioners, heat pumps and gas/electrics. For example, a
Honeywell W973 control will plug in to a CHA16-411 as
easily as it will plug in to a CHA16-1853 (and no field wiring
is required for either).
CHA16 unit components are shown in figure 1.
A-Control Box Components
CHA16H control box is shown in figure 2. The control box
is located adjacent to the compressor compartment behind
the electric heat access panel.
CHA16R-411 and CHA16-410 control box is shown in fig
ures 3 and 4. CHA16R-511/651 and CHA16-510/650 con
trol box is shown in figures 5 and 6. In both units, the control
box is located in the heating compartment behind the heat
ing compartment access panel.
The indoor blower access panel (all units) is located on the
opposite side of the unit from the control box access. Fig
ure 1 shows typical blower compartment access.
CHA16H CONTROL BOX
C1
CAPACITOR
WIRING
GROMMET
K3
BLOWER
RELAY
T1
TRANSFORMER
C5
CAPACITOR
ELECTRIC
HEAT SECTION
K1
CONTACTOR
FIGURE 2
Page 9
CHA16R-411 CONTROL BOX COMPONENTS
WIRING GROMMET
C12
DUAL
CAPACITOR
K3
BLOWER RELAY
F1 FUSE
ELECTRIC
HEAT
SECTION
T1
TRANSFORMER
K1
COMPRESSOR
CONTACTOR
FIGURE 3
WIRING GROMMET
CHA16-411/413 CONTROL BOX COMPONENTS
C12 DUAL CAPACITOR
(411 Units)
C1 FAN CAPACITOR
(413 UNITS)
T1
TRANSFORMER
F1
FUSE
T4
AUTO TRANSFORMER
(CHA16-413-1J only)
K3
BLOWER RELAY
ELECTRIC
HEAT SECTION
TB1
TERMINAL BOARD
K1
COMPRESSOR
CONTACTOR
FIGURE 4
WIRING GROMMET
CHA16R-511/651 CONTROL BOX
C7 START
CAPACITOR
K31 POTENTIAL
RELAY
K3
BLOWER RELAY
C12
DUAL CAPACI
TOR
F1 FUSE
ELECTRIC HEAT
SECTION
T1 TRANSFORMER
K1 COMPRESSOR
CONTACTOR
FIGURE 5
Page 10
CHA16-511/513/651/653 CONTROL BOX
K3
BLOWER RELAY
K31 POTENTIAL
RELAY
CHA16-511/651 units only
C7 START CAPACITOR
CHA16-511/651
units only
T4
AUTO TRANSFORMER
(CHA16-513/653-575v only)
LOCATION FOR
P AND Y VOLTAGE
WIRING
GROMMET
T1
TRANSFORMER
LOCATION FOR
G AND J VOLTAGE
F1 FUSE
TB1 TERMINAL
BOARD
K1 COMPRESSOR
CONTACTOR
C12
DUAL CAPACITOR
(CHA16-511/651 only)
OR
C1
CAPACITOR
(CHA16-513/653 only)
FIGURE 6
1-Transformer T1
3-Transformer Fuse F1
CHA16 series units use a
single line voltage to 24VAC
transformer located in the
control box. The transformer
supplies power to control cir
cuits in the unit. Transform
ers
are
rated
as shown in table 1. P volt
age (208/230V) transform
ers use two primary voltage
taps as shown in figure 7.
208 / 230 VOLT
TRANSFORMER
PRIMARY SECONDARY
ORANGE
BLUE
240 VOLTS
RED
Transformers used in CHA16H and CHA16R units are not
equipped with internal secondary voltage overcurrent
protection. Transformers in all other units are equipped
with an integral fuse connected in series with the blue sec
ondary voltage wire. The fuse may be accessed outside
the transformer and is rated as shown in table 1.
4-Cooling Contactor K1
208 VOLTS
BLACK
K1 is a 24V to line voltage contactor used to energize the
compressor and condenser fan in response to thermostat
demand. Threephase units use threepoledoublebreak
contactors. Singlephase units use singlepole contactors.
YELLOW
FIGURE 7
TABLE 1
T1 TRANSFORMER RATING
Unit
CHA16H261
CHA16H311
CHA16R411/511/651
CHA16411P/413Y
CHA16511P/513Y
CHA16651P/653Y
CHA16413G
CHA16513/653G
CHA16413/513/653J
VA
Internal
Primary Secondary Rating
Fuse
230VAC
24VAC
45
No Fuse
208/
230VAC
24VAC
70
3.5A
480VAC
440VAC
24VAC
24VAC
70
48
3.5A
2.5A
575VAC
24VAC
70
3.5A
WARNING
Electric shock hazard.
Can cause injury or death.
Singlephase units are equipped
with singlepole contactors. One
leg of compressor, capacitor and
condenser fan are always con
nected to line voltage. Turn off
power at disconnect before ser
vicing.
2-Terminal Strip TB1
All CHA16 commercial units are equipped with a low volt
age terminal strip (TB1). The strip is used for making up all
indoor thermostat and outdoor unit low voltage control wir
ing connections (see figures 4 and 6). The terminal strip is
located at the bottom left corner of the control box.
Page 11
NOTE-Contactor K1 is energized by the thermostat
control system. Depending on the control system
installed, the contactors may or may not be immediately
energized upon demand. Refer to the operation se
quence for the control system installed.
5-Autotransformer T4
AUTOTRANSFORMER T4
CHA16-413-1J ONLY
RED
460V
BLACK
575V
BROWN
CHA16-413 (575V) units
use a line voltage to 460V
autotransformer to power
the indoor blower. The auto
transformer is connected
directly to line voltage and is
powered at all times. It has
a maximum VA rating of
3.4A. See figure 8.
NOTE- Before servicing unit, be sure to identify the
compressor and fan sides of dual capacitor C12.
FIGURE 8
6-Indoor Blower Relay K3 (Cooling Speed)
208/230 volt units use a single 2PDT relay to energize the
indoor blower motor. 460 volt and 575 volt units use a
single 3PDT relay. The relay coil is energized by blower
demand from indoor thermostat terminal G" (cooling de
mand or fan switch in ON" position). When the coil is ener
gized, a set of N.O. contacts closes to energize the blower
motor on high speed. When there is a demand for heat, the
blower is energized by the blower relay located inside the
electric heat section of the unit.
460 (G) and 575(J) voltage units use a unique blower mo
tor. The motor utilizes a set of N.C. relay contacts (K3) to
complete an internal circuit when the motor is on low or
medium (heating) speed.
7-Potential Relay K31
8-Start Capacitor C7
Unit
CHA16511
CHA16R511
CHA16651
CHA16R651
Start Capacitor Ratings
C7 Start Capacitor Rating
135 155 MFD.
@ 320 VAC
176 216 MFD.
@ 320 VAC
The start capacitor uses a 15K ohm 2 watt bleed" resistor
connected in parallel with the capacitor terminals. A resis
tor is used to slowly discharge the capacitor when not in
use.
9-Dual Capacitor C12
CHA16 and CHA16R three, four and five ton singlephase
units use permanent split capacitor (PSC) motors in both
compressor and condenser fan. A single dual" capacitor
is used for both. A dual capacitor is two independent ca
pacitors inside one can. The fan side of the capacitor and
the compressor side of the capacitor have different ratings.
The capacitor is located inside the compressor compart
ment. Refer to table 3. See figures 3, 4, 5 and 6 for loca
tion.
TABLE 3
Unit
Relay K31 is used in singlephase -511 and -651 units only
and is located in the control box. It is a potential relay which
controls the operation of the starting circuit. The relay is
normally closed when the compressor (contactor K1) is deenergized. Capacitor (C7) is connected to a set of N.C. K31
contacts and is used to assist the compressor in starting.
When K1 energizes, the compressor immediately begins
startup. K31 remains de-energized during compressor
start-up and the start capacitor (C7) remains in the circuit.
As the compressor gains speed K31 is energized by elec
tromotive forces generated by the compressor. When K31
energizes, its contacts open to take the start capacitor out
of the circuit.
TABLE 2
All singlephase units (size -511 and larger) use a com
pressor start capacitor (C7) connected in parallel with the
compressor side of dual capacitor C12. The start capacitor
is energized during compressor startup and is switched off
by potential relay K31 when the compressor nears full
speed. Threephase units do not use start capacitors.
Table 2 shows start capacitor ratings for singlephase
CHA16s. The capacitor is mounted in the unit control box.
See figures 5 and 6 for capacitor location.
Run Capacitor Ratings
Key
Number
Type/
Rating
CHA16H261
C5
Single Capacitor
30 mfd compressor
@ 370V
CHA16H311
C5
Single Capacitor
35 mfd compressor
@ 370V
CHA16511
CHA16R511
C12
Dual Capacitor
40 mfd compressor
7.5 mfd fan
@ 440V
CHA16651
CHA16R651
C12
Dual Capacitor
45 mfd compressor
7.5 mfd fan
@ 440V
CHA16411
CHA16R411
C12
Dual Capacitor
40 mfd compressor
5 mfd fan
@ 370V
CHA16H261
CHA16H311
CHA16413Y
C1
Single Capacitor
5 mfd fan
@ 370V
CHA16413G/413J
CHA16513Y/513G/513J
CHA16653Y/653G/653J
C1
Single Capacitor
7 mfd fan
@ 370V
Page 12
10-Compressor Run Capacitor C5
All singlephase units use permanentsplitcapacitor com
pressor motors which require run capacitors to maximize
compressor efficiency. Three ton and larger units use the
compressor side of dual capacitor C12 while units smaller
than three tons use a single run capacitor C5. Table 3
shows C5 run capacitors used in CHA16 singlephase
units. Threephase units do not use run capacitors. See fig
ures 2 through 6 for capacitor location.
11-Fan Capacitor C1
All threephase CHA16 units use singlephase PSC con
denser fan motors. Motors are equipped with a fan" run
capacitor to maximize motor efficiency. The fan capacitor
is located in the compressor compartment and is electrical
ly connected as shown in the unit wiring diagram. Capaci
tor
ratings
are
shown
in
table 3.
In some single phase units, the fan capacitor is combined
with the compressor run capacitor in C12. Refer to dual ca
pacitor C12.
B-Cooling Components
Summary of Features
All units use DX cooling. Cooling in commercial units
(CHA16) may also be supplemented by fieldinstalled
economizer. CHA16H-261/311, CHA16-411/413 and
CHA16R-411 units use a single slab-type enhanced fin
evaporator with rifled tubing and capillary cap" tubes as
the
primary
expansion
device
(figure
10).
CHA16R-511/651 and CHA16-511/513/651/653 units use
a single slab-type enhanced fin evaporator with rifled tub
ing and a thermal expansion valve TXV" as the primary ex
pansion device (figure 9). CHA16R and CHA16H series
units are not equipped with crankcase heater, high pres
sure switch or loss of charge switch. All -510/-650 units are
equipped with thermometer well for charging. All models
use draw-through type condenser fans.
PLUMBING COMPONENTS
THERMAL EXPANSION VALVE SYSTEMS
HIGH PRESSURE AND LOSS OF CHARGE SWITCHES USED ON CHA16 UNITS ONLY.
CHA16(R)-510/650
SUCTION LINE
GAUGE PORT
CHA16510
THERMOMETER
WELL and LIQUID
GAUGE PORT
LIQUID LINE GAUGE PORT
EXPANSION VALVE
LIQUID LINE
EVAPORATOR
COIL
CONDENSER COIL
COMPRESSOR TERMINAL BOX
SUCTION LINE
GAUGE PORT
CHA16650
LOSS OF CHARGE SWITCH
(CHA16 only)
DISCHARGE LINE
HIGH PRESSURE SWITCH
(CHA16 only)
FIGURE 9
Page 13
PLUMBING COMPONENTS CAPILLARY TUBE SYSTEMS
CHA16H-261
EVAPORATOR COIL
SUCTION LINE
SUCTION LINE
GAUGE PORT
CONDENSER COIL
CAPILLARY TUBES
LIQUID LINE
GAUGE PORT
LIQUID LINE
DISCHARGE LINE
COMPRESSOR TERMINAL BOX
SUCTION LINE
GAUGE PORT
CHA16H-311
SUCTION
LINE
EVAPORATOR COIL
CONDENSER COIL
CAPILLARY TUBES
LIQUID LINE
COMPRESSOR TERMINAL BOX
DISCHARGE LINE
CHA16(R)-410
LIQUID LINE
GAUGE PORT
LIQUID LINE
GAUGE
PORT
LIQUID LINE
SUCTION LINE
EVAPORATOR COIL
CONDENSER COIL
COMPRESSOR
TERMINAL BOX
SUCTION LINE
GAUGE PORT
DISCHARGE LINE
LOSS OF CHARGE
SWITCH
(CHA16 only)
FIGURE 10
Page 14
HIGH PRESSURE
SWITCH
(CHA16 only)
TABLE 4
CHA16 SERIES UNITS - COMPRESSOR SPECIFICATIONS
Voltage/
Phase
Unit
Locked
Rotor
Amps
Rated
Load
Amps
Oil
Charge
Fl. Oz.
CHA16H-261
208/230/1
57.0
12.1
40
CHA16H-311
CHA16R-411
208/230/1
208/230/1
77.4
83.5
13.5
17.6
40
55
CHA16-411
CHA16-413-1Y
208/230/1
208/230/3
83.5
66.0
17.6
11.5
55
55
CHA16-413
CHA16R-511
575/3
208/230/1
35.0
118.0
5.3
23.4
55
55
CHA16-511
CHA16-513
208/230/1
208/230/3
118.0
90.0
23.4
15.4
55
55
CHA16-513
CHA16-513
CHA16R-651
460/3
575/3
208/230/1
45.0
36.0
135.0
8.4
6.5
27.6
55
55
70
CHA16-651
CHA16-653
208/230/1
208/230/3
135.0
105.0
27.6
17.7
70
70
CHA16-653
460/3
55.0
9.4
70
45.0
6.3
70
CHA16-653
575/3
28
170
208/230/3
124
17.2
60
8.3
460/3
575/3
47.7
6.6
*Texaco Capella WF-32 or Suniso 3GS or White Oil M/M Sontex 200-LT
**Heat Pump Grade Mineral
***Not Specified
CHA16-651-6
CHA16-653-6
CHA16-653-6
CHA16-653-6
208/230/1
1-Compressor B1
Table 4 shows the specifications of compressors used in all
units. Reciprocating compressors used in early model
CHA16 commercial units are equipped with insertion type
crankcase heaters. CHA16-6 model units use scroll com
pressors and are not equipped with crankcase heaters. All
compressors are protected by internal pressure relief
valves and internal overload protection circuitry.
WARNING
Electric Shock Hazard.
Can cause injury or death.
Do not operate without protective
cover over terminals. Disconnect
power before removing protec
tive cover. Discharge capacitors
before servicing unit.
2-High Pressure Limit S4
Viscosity
***
190-210
Oil Type
***
**
Crankcase
Heater
None
40 watt Insertion
Type Self
Regulating
None
***
190-210
***
***
**
***
*
30 watt Insertion
Type Self
Regulating
None
30 watt Insertion
Type Self
Regulating
190-210
**
40 watt Insertion
Type Self
Regulating
190-210
*
None
62
72
72
72
ries with the compressor contactor. When discharge pres
sure rises above 410+10 psig (indicating a problem in the
system) the switch opens and the compressor is de-ener
gized ( the economizer can continue to operate.) After the
problem has been found and corrected, the switch can be
reset by pushing the reset button.
3-Loss of Charge Switch S24
The loss of charge switch is an autoreset SPST N.C.
switch which opens on a pressure drop. All commercial
units (CHA16) are equipped with the switch. CHA16R and
CHA16H are not equipped with the switch. The switch is lo
cated in the compressor discharge line and is wired in se
ries with the high pressure switch and compressor contac
tor. When discharge pressure drops below 25+5 psig (indi
cating a loss of charge in the system) the switch opens and
the compressor is de-energized. The switch automatically
resets when refrigerant is added and discharge line pres
sure rises above 55+5 psig.
4-Condenser Coil
The high pressure limit is a manually reset SPST N.C.
All CHA16s have a single condenser coil. Each coil has two
switch which opens on a pressure rise. All commercial
rows (CHA16-511/513 and CHA16R-511 have 1-1/2 rows)
units (CHA16) are equipped with the limit. CHA16R and
of copper tubes fitted with ripple-edged aluminum en
CHA16H are not equipped with the limit. The switch is lo
cated in the compressor discharge line and is wired in se
hanced fins.
Page 15
5-Evaporator Coil
a-Capillary Tube Systems
All CHA16s have a single slab evaporator coil. The coil has
two rows of rifled copper tubes fitted with ripple-edged alu
minum fins. An expansion device feeds multiple parallel
circuits through the coil.
EVAPORATOR PLUMBING
CHA16H-261, CHA16H-311,
CHA16-411/413 and CHA16R-411
SUCTION LINE
CHA16H-261, CHA16H-311, CHA16-411/413 and
CHA16R-411 units use capillary tubes as the primary
expansion device in the indoor coil. Multiple cap tubes
feed independent parallel circuits through the coil. Ex
pansion takes place at the point where the cap tubes
enter the coil. See figure 11.
EVAPORATOR PLUMBING
CHA16-511/513, CHA16-651/653
CHA16R-511 and CHA16R-651
EVAPORATOR
CAP TUBES
CAPILLARY TUBE
EXPANSION DEVICE
EVAPORATOR
EVAPORATOR
LIQUID LINE
EXPANSION
VALVE FED BY
LIQUID LINE
EVAPORATOR
SENSING
BULB STRAPPED
TO SUCTION LINE
EQUAL
IZER
LINE
CAPILLARY TUBE
EXPANSION DEVICE
CAP TUBES
FEED
ER
TUBES
LIQUID LINE
SUCTION
LINE
FEEDER TUBES
SUCTION LINE
FIGURE 11
FIGURE 12
Page 16
b-Expansion Valve
3-Blower Motor B3
CHA16 -510 through -650 series units use a Thermal
Expansion Valve (TXV) as the primary expansion de
vice. See figure 12.
6-Thermometer Well (Figure 13)
THERMOMETER WELL
All CHA16-510/650 series
units are factory equipped
with a thermometer well for
charging the unit. The well is
THERMOMETER
used to accurately measure
WELL
the temperature of the liquid
LIQUID LINE
GAUGE PORT
line. The temperature mea
LIQUID LINE
sured is then used to calcu
late the approach or subcool
FIGURE 13
ing temperature. Approach
and subcooling tempera
tures are compared to tables printed in the charging sec
tion of this manual to determine the correct charge. Ther
mometer wells are equipped with a gauge port for connec
tion of high pressure gauge.
All CHA16 series units use singlephase PSC blower mo
tors. A single run capacitor is mounted on the blower hous
ing. All motors use multiple speed taps. Typically, the high
speed tap is energized during compressor operation and a
lower speed tap is energized during heating operation.
Blower motors in CHA16 -261, -311, -411 and -511 units
have four speed taps. Motors in CHA16-651 units have
five speed taps. All 460 voltage units have three taps.
Blower motor specifications are listed in table 6. Blower
performance ratings are listed in the tables on pages 6, 7
and 8.
TABLE 6
To accurately measure the temperature of the liquid line,
the well should be filled with a light mineral oil before using.
This will ensure good heat transfer to the thermometer.
BLOWER MOTOR - 1075 RPM - CCW ROTATION
Motor Phase HP
Unit
Volts
FLA
CHA16H-261
208/230
1
1/3
2.1
CHA16H-311
208/230
1
1/3
2.1
CHA16-411/413 CHA16R-411
CHA16-413
208/230
460
1
1
1/3
1/2
3.9
1.8
CHA16-511/513 CHA16R-511
208/230
1
1/2
3.9
460
1
3/4
1.8
575
208/230
1
1
3/4
3/4
0.7
4.6
460
575
1
1
3/4
3/4
1.8
0.7
CHA16-513
CHA16-513
CHA16-651/653 CHA16R-651
C-Fan and Blower
CHA16-653
CHA16-653
1-Condenser Fan and Motor B4
The table on pages 2, 3 and 4 in this manual show the
specifications of condenser fans used in CHA16s. The
condenser fan in all units is controlled by cooling contactor
K1. The condenser fan can be accessed by removing the
fan grill located on top of the unit.
2-Condenser Fan Motor Capacitor C1
All CHA16s use singlephase PSC condenser fan motors.
Table 5 shows fan run capacitor ratings for CHA16s.
A third (blue) tap on G (460V) and J (575V) volt motors is
used to complete an internal circuit during low or medium
speed operation. It must never be connected to line volt
age. During low speed (red tap) operation, the high speed
(black) tap is disconnected from line voltage and is con
nected to blue internal wiring tap. Internal wiring is shown
in figure 14.
460 VOLT BLOWER MOTOR WINDINGS
HIGH SPEED
WINDING
TABLE 5
CONDENSER FAN MOTOR CAPACITOR
Unit & Unit Voltage
Type
MFD @ Volts
ORANGE
BLACK
MEDIUM SPEED
WINDING
BLUE
LOW SPEED
WINDING
YELLOW
RED
CHA16H-261
CHA16H-311
208/230
208/230
Single
Single
7
7
370
370
CHA16-411
CHA16R-411
208/230
Dual (shared with
compressor)
5
370
CHA16-413
208/230
Single
5
370
CHA16-511/651
208/230
CHA16R-511/651
Single
7
370
The motor has three sets of windings. The high speed winding is inde
pendent of the other two and the medium and low speed windings are
tied together with a center tap. High speed is accomplished by ener
gizing the high speed windings. Medium speed is accomplished by
connecting the medium speed and high speed windings in series. Low
speed is accomplished by connecting the low, medium and high
speed windings in series. Refer to unit wiring diagram and Corp.
8909-L7.
CHA16-413/513/653 ALL
Single
7
370
FIGURE 14
Page 17
1-Relay K15
CAUTION
Relay K15 is a singlepole singlethrow relay located
on the control panel of all commercial singlephase
ECH16 units (15, 20 and 25 kW). K15 is equipped with
a 24VAC coil which is energized when pilot relay K43
closes. When K15 is energized, the first stage heating
elements are energized. (HE1 in ECH1615; HE1 and
HE2 in ECH1620 and ECH1625).
Potential for damage to 460V and 575V blower mo
tors and/or unit electrical circuits.
The blue blower motor lead must never be con
nected to a line voltage power lead (blower de
mand from heat relay or blower relay). Refer to
unit wiring diagram for proper wiring.
Can result in improper operation, increased cur
rent flow and/or burnt windings.
2-Contactor K15
Contactor K15 is a threepole double break contactor
used in all commercial threephase ECH16 units. K15
is equipped with a 24VAC coil which is energized when
pilot relay K43 closes. When K15 is energized, the first
stage heating elements are energized.
4-Indoor Blower Motor Capacitor C4
All CHA16 208/230v units use singlephase PSC motors. A
run capacitor is mounted on the blower housing. Capacitor
ratings are shown in table 7.
460v and 575v units use singlephase PSC 460v blower
motors. A run capacitor is located on the blower housing.
TABLE 7
Unit 208/230v
Contactor K15 used in ECH16151Y and
ECH16251G units is equipped with a set of auxiliary
singlepole doublethrow contacts. The auxiliary con
tacts are not used in this application.
3-Relay K16
Relay K16 is a singlepole singlethrow relay located
on the control panel of all commercial singlephase
ECH16 units (15, 20 and 25 kW). K16 is equipped with
a 24VAC coil which is energized when pilot relay K43
closes. When K16 is energized, the second stage heat
ing elements are energized (HE2 in ECH1615; HE3
and
HE4
in
ECH1620
and
ECH1625).
Blower Capacitor Rating
CHA16H-261/-311
7 MFD at 370 V
CHA16-411P/-413Y CHA16R-411
10 MFD at 370 V
CHA16-511P/-513Y CHA16R-411
20 MFD at 370 V
CHA16-651P/-653Y CHA16R-411
CHA16-413G,J
20 MFD at 370 V
10 MFD at 370 V
CHA16-513G,J
10 MFD at 370 V
CHA16-653G,J
20 MFD at 370 V
4-Contactor K16
Contactor K16 is a threepole double break contactor
used in commercial 20 and 25 kW threephase ECH16
units. K16 is equipped with a 24VAC coil which is ener
gized when time delay DL2 closes. When K16 is ener
gized, the second stage heating elements are ener
gized.
III-OPTIONAL ECH16 ELECTRIC HEAT
A-Matchups and Ratings
Tables 8, 9, 10, 11 and 12 show all possible CHA16 to
ECH16 matchups. Also shown in the tables are ECH16
electrical ratings.
5-Relay K17
B-Electric Heat Components
ECH16 parts arrangement is shown in figures 15, 16, 17,
18, 19, 20 and 21. All ECH16 units consist of electric heat
ing elements exposed directly to the airstream. Elements
are sequenced on and off by heat relays or contactors in
response to thermostat demand.
Page 18
Relay K17 is a singlepole singlethrow relay located
on the control panel of all commercial singlephase
ECH16 units (15, 20 and 25 kW). K17 is equipped with
a 24VAC coil which is energized when pilot relay K43
closes. When K17 is energized, the third stage heating
elements are energized (HE3 in ECH1615; HE5 and
HE6 in ECH1620 and ECH1625).
TABLE 8
CHA16261 & CHA16311 ELECTRIC HEAT DATA
Optional Single Point Power Source Boxes
Single
Package
Unit
Model No.
Electric
Heater
Model No.
& Net Weight
No. of
Steps &
Phase
Volts
Input
Heater Only
*Minimum
Circuit
Ampacity
Electric
Heat
Kw
Input
Electric
Heat
Btuh
Input
208
22.5
3.7
12,600
Heater Sub
Fuse Box
Model No.
Unit Sub
Fuse Box
Model No.
Total Unit &
Electric Heat
*Minimum
Circuit
Ampacity
25.1
ECH16R5
1 step
220
23.9
4.2
14,300
ECH16R
ECH16261
26.5
(4 lbs.)
(1 phase)
230
24.9
4.6
15,700
26/415
240
26.0
5.0
17,100
28.6
208
31.6
5.3
18,100
34.3
27.5
ECH16R7
1 step
220
33.5
5.9
20,100
ECH16R
(5 lbs.)
(1 phase)
230
35.0
6.4
21,800
26/657
240
36.5
7.0
23,900
39.1
208
45.1
7.5
25,600
47.8
CHA16H261
ECH16261
36.1
37.6
ECH16R10
1 step
220
47.8
8.4
28,700
ECH16R
(5 lbs.)
(1 phase)
230
50.0
9.2
31,400
26/6510
240
52.1
10.0
34,100
54.8
208
67.8
11.3
38,600
70.4
ECH16261
50.4
52.6
ECH1615
1 step
220
71.6
12.6
43,000
ECH16261
(18 lbs.)
(1 phase)
230
74.9
13.8
47,100
77.5
240
78.1
15.0
51,200
80.8
208
22.5
3.7
12,600
25.1
ECH16311
74.3
ECH16R5
1 step
220
23.9
4.2
14,300
ECH16R
26.5
(4 lbs.)
(1 phase)
230
24.9
4.6
15,700
26/415
240
26.0
5.0
17,100
28.6
208
31.6
5.3
18,100
34.3
27.5
ECH16R7
1 step
220
33.5
5.9
20,100
ECH16R
(5 lbs.)
(1 phase)
230
35.0
6.4
21,800
26/657
240
36.5
7.0
23,900
39.1
208
45.1
7.5
25,600
47.8
CHA16311
ECH16311
36.1
37.6
ECH16RR10
1 step
220
47.8
8.4
28,700
ECH16R
(5 lbs.)
(1 phase)
230
50.0
9.2
31,400
26/6510
240
52.1
10.0
34,100
54.8
208
67.8
11.3
38,600
70.4
ECH16311
50.4
52.6
ECH1615
1 step
220
71.6
12.6
43,000
ECH16311
(18 lbs.)
(1 phase)
230
74.9
13.8
47,100
77.5
240
78.1
15.0
51,200
80.8
*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.
Page 19
74.3
TABLE 9
CHA16(R)411413 ELECTRIC HEAT DATA
Optional Single Point Power Source Boxes
Single
Package
Unit
Model No.
CHA16411
CHA16R411
Electric
Heater
Model No.
& Net Weight
No. of
Steps &
Phase
ECH16R5
(4 lbs.)
1 step
(1 phase)
ECH16R7
(5 lbs.)
1 step
(1 phase)
ECH16R10
(5 lbs.)
1 step
(1 phase)
ECH1615
(18 lbs.)
1 step
(1 phase)
ECH1620
(19 lbs.)
1 step
(1 phase)
ECH165
(17 lbs.)
1 step
(3 phase)
ECH167
(17 lbs.)
CHA16413
ECH1610
(17 lbs.)
ECH1615
(20 lbs.)
ECH1620
(20 lbs.)
1 step
(3 phase)
1 step
(3 phase)
1 step
(3 phase)
2 steps
(3 phase)
Volts
Input
Heater Only
*Minimum
Circuit
Ampacity
Elec
tric
Heat
Kw
Input
208
220
230
240
208
220
230
240
208
220
230
240
208
220
230
240
208
220
230
240
208
220
230
240
208
220
230
240
440
460
480
208
220
230
240
440
460
480
208
220
230
240
440
460
480
208
220
230
240
440
460
480
22.5
23.9
24.9
26.0
31.6
33.5
35.0
36.5
45.1
47.8
50.0
52.1
67.8
71.6
74.9
78.1
90.3
95.5
99.8
104.1
13.0
13.8
14.4
15.0
18.3
19.3
20.1
21.0
9.6
10.1
10.5
26.1
27.6
28.9
30.1
13.8
14.4
15.0
39.1
41.4
43.2
45.1
20.6
21.6
22.5
52.1
55.1
57.6
60.1
27.6
28.9
30.1
3.7
4.2
4.6
5.0
5.3
5.9
6.4
7.0
7.5
8.4
9.2
10.0
11.3
12.6
13.8
15.0
15.0
16.8
18.4
20.0
3.7
4.2
4.6
5.0
5.3
5.9
6.4
7.0
5.8
6.5
7.0
7.5
8.4
9.2
10.0
8.4
9.2
10.0
11.3
12.6
13.8
15.0
12.6
13.8
15.0
15.0
16.8
18.4
20.0
16.8
18.4
20.0
Electric
Heat
Btuh
Input
12,600
14,300
15,700
17,100
18,100
20,100
21,800
23,900
25,600
28,700
31,400
34,100
38,600
43,000
47,100
51,200
51,200
57,300
62,800
68,300
12,600
14,300
15,700
17,100
18,100
20,100
21,800
23,900
19,800
22,200
23,900
25,600
28,700
31,400
34,100
28,700
31,400
34,100
38,600
43,000
47,100
51,200
43,000
47,100
51,200
51,200
57,300
62,800
68,300
57,300
62,800
68,300
Heater Sub
Fuse Box
Model No.
Unit Sub
Fuse Box
Model No.
ECH16R
26/415
ECH16411
ECH16R
26/657
ECH16411
ECH16R
26/6510
ECH16411
ECH16411
ECH16411
ECH16413
ECH16413
ECH16413
ECH16413
ECH16413
ECH16413
ECH16413
ECH16413
ECH16413
*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.
Page 20
Total Unit &
Electric Heat
*Minimum Circuit
Ampacity
26.3
27.6
28.6
29.8
35.4
37.3
38.8
40.3
48.9
51.5
53.8
55.9
71.5
75.4
78.6
81.9
94.0
99.3
103.5
107.9
16.8
17.5
18.1
18.8
22.0
23.0
23.9
24.8
11.9
12.4
12.8
29.9
31.4
32.6
33.9
16.0
16.6
17.3
42.9
45.1
47.0
48.9
22.9
23.9
24.8
55.9
58.9
61.4
63.9
29.9
31.1
32.4
TABLE 10
CHA16(R)511/651 ELECTRIC HEAT DATA
Optional Single Point Power Source Boxes
Single
Package
Unit
Model No.
Electric
Heater
Model No.
& Net Weight
No. of
Steps &
Phase
ECH16R7
1 step
(5 lbs.)
(1 phase)
Electric
Heat
Kw
Input
Electric
Heat
Btuh
Input
208
31.6
5.3
18,100
220
33.5
5.9
230
35.0
240
36.5
Heater Sub
Fuse Box
Model No.
Unit Sub
Fuse Box
Model No.
20,100
ECH16R
ECH16511
6.4
21,800
26/657
7.0
23,900
Total Unit &
Electric Heat
*Minimum
Circuit
Ampacity
36.5
38.4
39.9
41.4
208
45.1
7.5
25,600
1 step
220
47.8
8.4
28,700
ECH16R
(5 lbs.)
(1 phase)
230
50.0
9.2
31,400
26/6510
240
52.1
10.0
34,100
57.0
208
67.8
11.3
38,600
72.6
50.0
ECH16511
52.6
54.9
ECH16R15
1 step
220
71.6
12.6
43,000
(18 lbs.)
(1 phase)
230
74.9
13.8
47,100
79.8
240
78.1
15.0
51,200
83.0
208
90.3
15.0
51,200
95.1
ECH16511
ECH16511
76.5
ECH1620
1 step
220
95.5
16.8
57,300
(19 lbs.)
(1 phase)
230
99.8
18.4
62,800
104.6
240
104.1
20.0
68,300
109.0
100.4
208
112.9
18.8
64,200
ECH1625
1 step
220
119.4
21.0
71,700
(19 lbs.)
(1 phase)
230
124.9
23.0
78,500
129.8
240
130.3
25.0
85,300
135.1
117.8
ECH16511
124.3
208
31.6
5.3
18,100
ECH16R7
1 step
220
33.5
5.9
20,100
ECH16R
(5 lbs.)
(1 phase)
230
35.0
6.4
21,800
26/657
240
36.5
7.0
23,900
42.3
208
45.1
7.5
25,600
50.9
37.4
ECH16651
39.3
40.8
ECH16R10
1 step
220
47.8
8.4
28,700
ECH16R
(5 lbs.)
(1 phase)
230
50.0
9.2
31,400
26/6510
240
52.1
10.0
34,100
57.9
208
67.8
11.3
38,600
73.5
CHA16651
CHA16R651
Heater Only
*Minimum
Circuit
Ampacity
ECH16R10
CHA16511
CHA16R511
Volts
Input
ECH16651
53.5
58.3
ECH16R15
1 step
220
71.6
12.6
43,000
(18 lbs.)
(1 phase)
230
74.9
13.8
47,100
ECH16651
77.4
80.6
240
78.1
15.0
51,200
83.9
208
90.3
15.0
51,200
ECH1620
1 step
220
95.5
16.8
57,300
96.0
(19 lbs.)
(1 phase)
230
99.8
18.4
62,800
105.5
240
104.1
20.0
68,300
109.9
ECH16651
101.3
208
112.9
18.8
64,200
ECH1625
1 step
220
119.4
21.0
71,700
118.6
(19 lbs.)
(1 phase)
230
124.9
23.0
78,500
130.6
240
130.3
25.0
85,300
136.0
ECH16651
*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.
Page 21
125.1
TABLE 11
CHA16513 ELECTRIC HEAT DATA
Single
Package
Unit
Model No.
Electric
Heater
Model No.
& Net Weight
ECH167
(17 lbs.)
ECH1610
(17 lbs.)
No. of
Steps &
Phase
1 step
(3 phase)
1 step
(3 phase)
CHA16513
ECH1615
(17 lbs.)
ECH1620
(20 lbs.)
ECH1625
(20 lbs.)
1 step
(3 phase)
2 step
(3 phase)
2 steps
(3 phase)
Optional Single Point Power Source
Total Unit &
Unit Sub
Electric Heat
Fuse Box
*Minimum
Model No.
Circuit
Ampacity
Volts
Input
Heater Only
*Minimum
Circuit
Ampacity
Electric
Heat
Kw
Input
Electric
Heat
Btuh
Input
208
220
230
240
18.3
19.3
20.1
21.0
5.3
5.9
6.4
7.0
18,100
20,100
21,800
23,900
440
460
480
9.6
10.1
10.5
5.8
6.5
7.0
19,800
22,200
23,900
ECH16513/653
11.9
12.4
12.8
550
575
600
7.6
8.0
8.4
5.8
6.4
7.0
19,800
21,800
23,900
ECH16413/513
9.9
10.3
10.6
208
220
230
240
26.1
27.6
28.9
30.1
7.5
8.4
9.2
10.0
25,600
28,700
31,400
34,100
440
460
480
13.8
14.4
15.0
8.4
9.2
10.0
28,700
31,400
34,100
ECH16513/653
16.0
16.6
17.3
550
575
600
11.0
11.5
12.0
8.4
9.2
10.0
28,700
31,400
34,100
ECH16413/513
13.3
13.8
14.3
208
220
230
240
39.1
41.4
43.2
45.1
11.3
12.6
13.8
15.0
38,600
43,000
47,100
51,200
440
460
480
20.6
21.6
22.5
12.6
13.8
15.0
43,000
47,100
51,200
ECH16513/653
22.9
23.9
24.8
550
575
600
16.5
17.3
18.0
12.6
13.7
15.0
43,000
46,800
51,200
ECH16413/513
18.8
19.5
20.3
208
220
230
240
52.1
55.1
57.6
60.1
15.0
16.8
18.4
20.0
51,200
57,300
62,800
68,300
440
460
480
27.6
28.9
30.1
16.8
18.4
20.0
57,300
62,800
68,300
ECH16513/653
29.9
31.1
32.4
550
575
600
22.0
23.0
24.0
16.8
18.3
20.0
57,300
62,400
68,300
ECH16413/513
24.3
25.3
26.3
208
220
230
240
65.1
68.9
72.0
75.1
18.8
21.0
22.9
25.0
64,200
71,700
78,100
85,300
440
460
480
34.5
36.0
37.6
21.0
22.9
25.0
71,700
78,100
85,300
ECH16513/653
36.8
38.3
39.9
550
575
600
27.6
28.9
30.1
21.1
23.0
25.0
72,000
78,500
85,300
ECH16413/513
29.9
31.1
32.4
ECH16513
ECH16513
ECH16513
ECH16513
ECH16513
*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.
Page 22
23.1
24.1
25.0
25.9
31.0
32.5
33.8
35.0
44.0
46.3
48.1
50.0
57.0
60.0
62.5
65.0
70.0
73.8
76.9
80.0
TABLE 12
CHA16653 ELECTRIC HEAT DATA
Single
Package
Unit
Model No.
Electric
Heater
Model No.
& Net Weight
ECH167
(17 lbs.)
ECH1610
(17 lbs.)
No. of
Steps &
Phase
1 step
(3 phase)
1 step
(3 phase)
CHA16653
ECH1615
(17 lbs.)
ECH1620
(20 lbs.)
ECH1625
(20 lbs.)
1 step
(3 phase)
2 step
(3 phase)
2 steps
(3 phase)
Optional Single Point Power Source
Total Unit &
Unit Sub
Electric Heat
Fuse Box
*Minimum
Model No.
Circuit
Ampacity
Volts
Input
Heater Only
*Minimum
Circuit
Ampacity
Electric
Heat
Kw
Input
Electric
Heat
Btuh
Input
208
220
230
240
18.3
19.3
20.1
21.0
5.3
5.9
6.4
7.0
18,100
20,100
21,800
23,900
440
460
480
9.6
10.1
10.5
5.8
6.5
7.0
19,800
22,200
23,900
ECH16513/653
11.9
12.4
12.8
550
575
600
7.6
8.0
8.4
5.8
6.4
7.0
19,800
21,800
23,900
ECH16653
9.9
10.3
10.6
208
220
230
240
26.1
27.6
28.9
30.1
7.5
8.4
9.2
10.0
25,600
28,700
31,400
34,100
440
460
480
13.8
14.4
15.0
8.4
9.2
10.0
28,700
31,400
34,100
ECH16513/653
16.0
16.6
17.3
550
575
600
11.0
11.5
12.0
8.4
9.2
10.0
28,700
31,400
34,100
ECH16653
13.3
13.8
14.3
208
220
230
240
39.1
41.4
43.2
45.1
11.3
12.6
13.8
15.0
38,600
43,000
47,100
51,200
440
460
480
20.6
21.6
22.5
12.6
13.8
15.0
43,000
47,100
51,200
ECH16513/653
22.9
23.9
24.8
550
575
600
16.5
17.3
18.0
12.6
13.8
15.0
43,000
46,800
51,200
ECH16653
18.8
19.5
20.3
208
220
230
240
52.1
55.1
57.6
60.1
15.0
16.8
18.4
20.0
51,200
57,300
62,800
68,300
440
460
480
27.6
28.9
30.1
16.8
18.4
20.0
57,300
62,800
68,300
ECH16513/653
29.9
31.1
32.4
550
575
600
22.0
23.0
24.0
16.8
18.3
20.0
57,300
62,400
68,300
ECH16653
24.3
25.3
26.3
208
220
230
240
65.1
68.9
72.0
75.1
18.8
21.0
22.9
25.0
64,200
71,700
78,100
85,300
440
460
480
34.5
36.0
37.6
21.0
22.9
25.0
71,700
78,100
85,300
ECH16513/653
36.8
38.3
39.9
550
575
600
27.6
28.9
30.1
21.1
23.0
25.0
72,000
78,500
85,300
ECH16653
29.9
31.1
32.4
ECH16653
ECH16513
ECH16653
ECH16513
ECH16653
*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.
Page 23
24.0
25.0
25.9
26.8
31.9
33.4
34.6
35.9
44.9
47.1
49.0
50.9
57.9
60.9
63.4
65.9
70.9
74.6
77.8
80.9
PARTS ARRANGEMENT ECH16R5/7/10P
Thermal (Heat)
Relay K33
Thermal (Heat)
Relay K32
S15
Primary Limit S15
S15
S15
Thermal (Heat)
Relay K32
Primary Limit S15
Secondary Limit F5
Secondary Limit F5
5Kw
7/10Kw
FIGURE 15
PARTS ARRANGEMENT ECH16-15-P
Electric Heat Relay K15
Electric Heat Relay K16
Electric Heat Relay K17
Pilot Relay K43
S15
K17
K43
K16
K15
S20
Primary Limit S15
35A FUSE
Secondary Limit S20
Current Limiting Fuses F3
S20
Current Limiting Fuses F3
60A FUSE
S20
FIGURE 16
Page 24
PARTS ARRANGEMENT ECH16-20/25-P
Electric Heat Relay K15
Electric Heat Relay K16
Electric Heat Relay K17
Pilot Relay K43
S15
K17
K43
K16
K15
S20
S15
Primary Limit S15
Secondary Limit S20
Current Limiting Fuses F3
S20
Current Limiting Fuses F3
S20
FIGURE 17
PARTS ARRANGEMENT ECH16-5/15-Y and ECH16-5/15-G,J
Electric Heat Contactor K15
S15
K43
Pilot Relay K43
K15
S20
S15
Primary Limit S15
Secondary Limit S20
S20
Current Limiting Fuses F3
S20
FIGURE 18
Page 25
PARTS ARRANGEMENT ECH16-20-Y
First Stage
Electric Heat Contactor K15
Second Stage
Electric Heat Contactor K16
S15
K15
Pilot Relay K43
S15
K43
K16
Primary Limit S15
Secondary Limits S20
Current Limiting Fuses F3
DL2
S20
S20
S20
S20
Second Stage Delay DL2
Current Limiting Fuses F3
FIGURE 19
PARTS ARRANGEMENT ECH16-25-Y
First Stage
Electric Heat Contactor K15
Second Stage
Electric Heat Contactor K16
S15
K15
Pilot Relay K43
K43
S20
S15
K16
Secondary Limits S20
60A FUSE
Second Stage
Current Limiting Fuses F3
Second Stage Delay DL2
Primary Limit S15
DL2
S20
S20
S20
S20
40A FUSE
First Stage
Current Limiting Fuses F3
FIGURE 20
Page 26
PARTS ARRANGEMENT ECH16-20/25-G,J
Electric Heat Contactor K15
S15
K43
K15
Primary Limit S15
Pilot Relay K43
Secondary Limits S20
Current Limiting Fuses F3
S20
S20
S20
S20
FIGURE 21
6-Thermal (Heat) Relay K32, K33
TABLE 13
THERMAL (HEAT) RELAYS
ECH16 Usage*
Relay / Operation
K32
K33
Thermal sequencing (heat) relays are used to energize
heating elements in ECH16R electric heaters. A heat
FOUR TIMINGS
relay is a normally open relay with a resistive element
CONTROL VOLTAGE COIL
for a coil and a bimetal disc actuating the contacts.
M2
M1
When the relay is energized, internal resistance heats
M4
M3
the bimetal disk causing the contacts to close. When
H
H
the relay is deenergized, the disk cools and the con
M2
M1
tacts open.
M4
M3
TYPICAL
A sequencing relay has THERMAL SEQUENCING
H
H
multiple contacts. Each
(HEAT) RELAY
Acts as two independent con
set of contacts is con
trols. 24VAC coil. K32 controls
M2
M1M2 and M3M4 contacts.
nected to a separate bi
K33 controls M5M6 and M7M8
M1
metal disk. When the
contacts. Contacts close 1110
H
after HH is energized and open
relay is energized, in
1110 sec. after HH is deener
H
ternal resistance heats
gized. All contacts operate on a
first on last off basis.
the bimetal disks at dif
ferent rates causing the
TWO TIMINGS
contacts to close at dif
CONTROL VOLTAGE
FIGURE 22
ferent times. The con
COIL
M2
M1
tacts are calibrated to
M4
M3
operate on a first on last off basis. Some heat relays
H
H
may have two resistive coils; each with its own set of
24VAC coil. Both sets of con
contacts. Although they are physically attached, they
tacts close 1110 after HH is en
operate as two independent relays. Figure 22 shows a
ergized and open 1110 sec. af
ter HH is deenergized. Termi
typical heat relay. Table 13 describes the heat relays
nals M1M2 operate on a first on
used in ECH16 series units.
last off basis.
Page 27
ECH16R7P
ECH16R7P
ECH16R10P ECH16R10P
ECH16R5P
7-Resistor R6
10-Fuse F3
A resistor is used in parallel with the coil of heat relay
K32 in ECH16R5 electric heaters. The resistor is rated
150 ohm + 10%, 10 watt.
The resistor reduces the effects of inrush current on the
thermostat. Heat relay K32 draws approximately 0.7
amps immediately after being energized. As the relay
coil heats, the current subsides. Within a few seconds
after being energized, the current is reduced to mini
mum
level
(approximately
0.18
amps).
Contactor K16 used in ECH16251Y unit is equipped
with a set of auxiliary singlepole doublethrow con
tacts. The auxiliary contacts are not used in this ap
plication.
8-Relay K43
Relay K43 is a doublepole double throw pilot relay
used in all commercial ECH16 units. The relay uses a
24VAC coil which is energized by thermostat demand.
The coil is wired in series with the primary high temper
ature limit S15. If an overtemperature condition exists,
pilot relay K43 is immediately deenergized and elec
tric heat operation immediately stops.
When relay K43 is energized, normally open contacts
K431 and K432 close. When K431 closes, contactor
K15 (and time delay DL2 if so equipped) are energized
to begin electric heat operation. When K432 closes,
the indoor blower begins operating on heating speed.
9-Time Delay DL2
Time delay DL2 is an electronic singlepole single
throw time delay relay used in commercial 20 and 25
kW threephase ECH16 units. DL2 allows staging by
providing a timed interval between the first and second
sets of heating elements. DL2 is energized with contac
tor K15 when pilot relay K431 closes. When the delay
coil is energized, its normally open contacts are
delayed 30 seconds (+20%) before closing. When the
delay coil is deenergized, its contacts are delayed one
second (+20%) before opening.
F3 is a current limiting fuse connected in series with
each leg of electric heat. Fuses used in ECH16 series
units are shown in table 14.
TABLE 14
ECH16 FUSE RATINGS
Unit
Fuse F3
Usage
Quantity HE=Heating Element
ECH16151P
35.0A @ 250V
60.0A @ 250V
Two
Two
ECH16201P
45.0A @ 250V
Six
ECH16251P
60.0A @ 250V
Six
ECH1651Y
ECH1671Y
ECH16101Y
ECH16151Y
20.0A @ 250V
25.0A @ 250V
40.0A @ 250V
60.0A @ 250V
Three
Three
Three
Three
ECH16201Y
40.0A @ 250V
Six
ECH1671G,J
ECH16101G
ECH16101J
ECH16151G
ECH16151J
40.0A @ 250V
60.0A @ 250V
10.0A @ 600V
20.0A @ 600V
15.0A @ 600V
30.0A @ 600V
25.0A @ 600V
Three
Three
Three
Three
Three
Three
Three
ECH16201G
40.0A @ 600V
Three
ECH16201J
30.0A @ 600V
Three
ECH16251G
50.0A @ 600V
Three
ECH16251J
40.0A @ 600V
Three
ECH16251Y
HE(1)
HE(2) & HE(3)
HE(1), HE(2), HE(3),
HE(4), HE(5), HE(6)
HE(1), HE(2), HE(3),
HE(4), HE(5), HE(6)
HE(1), HE(2),
HE(3) HE(2),
HE(1),
HE(3)
HE(1), HE(2),
HE(3) HE(2),
HE(1),
HE(3) HE(2), HE(3),
HE(1),
HE(4), HE(5), HE(6)
HE(1), HE(2),
HE(3)
HE(4), HE(5),
HE(6)
HE(1), HE(2),
HE(3) HE(2),
HE(1),
HE(3) HE(2),
HE(1),
HE(3)
HE(1), HE(2),
HE(3) HE(2),
HE(1),
HE(3)
HE(1), HE(2), HE(3),
HE(4), HE(5), HE(6)
HE(1), HE(2), HE(3),
HE(4), HE(5), HE(6)
HE(1), HE(2), HE(3),
HE(4), HE(5), HE(6)
HE(1), HE(2), HE(3),
HE(4), HE(5), HE(6)
All fuses are dual element U.L. Class RK5.
11-High Temperature Primary S15
Page 28
S15 is the primary high temperature limit. It is located in
the electric heat unit immediately downstream from the
heating elements. S15 is a singlepole singlethrow
normally closed thermostat. S15 ratings are shown in
table 15. A typical primary limit is shown in figure 23.
In ECH16R series
units, multiple S15
thermostats may be
used. One S15 ther
mostat is wired in se
ries with each heating
element. When S15
trips, some heating
elements may remain
operable.
13-High Temperature Secondary F5
PRIMARY LIMIT S15,
SECONDARY LIMIT S20
ECH16R series units use
thermal cutoff fuses for sec
ondary high temperature
protection. The fuses are
connected in series with
each heating element (figure
24). The fuses are ceramic
nonresettable fusible links
which must be replaced after
FIGURE 24
being tripped. Each cutoff is preset to open at 170°F +
3°F.
THERMAL CUTOFF
FUSE F5
FIGURE 23
TABLE 15
Unit
ECH16 PRIMARY TEMPERATURE LIMIT S15 RATINGS
Open on Rise
Close on Fall
ECH16R51P
ECH16R71P*
ECH16R101P*
ECH16R151P
ECH16151Y
ECH16201Y
ECH1671G,1J
ECH16101G,1J
ECH16151G,1J
ECH16201G,1J
150°F + 5°F
110°F + 7°F
140°F + 5°F
100°F + 6°F
ECH16201P
135°F + 5°F
95°F + 6°F
ECH16251P
ECH1651Y
ECH1671Y
145°F + 5°F
105°F + 6°F
120°F + 5°F
100°F + 6°F
ECH16101Y
150°F + 5°F
115°F + 6°F
ECH16251Y
ECH16251G
ECH16251J
155°F + 5°F
115°F + 7°F
160°F + 5°F
120°F + 6°F
14-Heating Elements
ECH16 and ECH16R heating elements are composed
of helix wound nichrome wire heating elements which
are exposed directly to the airstream. Heating ele
ments are energized directly by contactors or thermal
(heat) relays located on the control panel. Once ener
gized, heat transfer to the airstream is instantaneous.
Overtemperature protection is provided by primary and
secondary high temperature limits. Overcurrent
protection (ECH16 commercial units only) is provided
by current limiting fuses. Heating elements used in
ECH16 and ECH16R units are shown in table 16.
TABLE 16
Unit
All S15 thermostats are autoreset type singlepole singlethrow.
*Uses two thermostats; one connected to each heating element.
In ECH16 commercial units, only one S15 thermostat is
used. A single S15 thermostat is wired in series with
pilot relay K43. When S15 trips, all heating elements
are deenergized.
12-High Temperature Secondary S20
ECH16 commercial units use nonresettable thermo
stats for secondary high temperature protection. One
switch is connected in series with each leg of the ele
ment assembly. Each S20 thermostat is physically lo
cated adjacent to the element it is protecting. S20 is a
singlepole singlethrow normally closed thermostat.
The thermostat actuates at 185°F + 8°F on a tempera
ture rise and cannot be reset. Once tripped, it must be
replaced.
Page 29
ECH165P
ECH167P
ECH1610P
ECH1615P
ECH1620P
ECH1625P
ECH165Y
ECH167Y
ECH1610Y
ECH1615Y
ECH1620Y
ECH1625Y
ECH167G
ECH1610G
ECH1615G
ECH1620G
ECH1625G
ECH167J
ECH1610J
ECH1615J
ECH1620J
ECH1625J
Total Watts
Number of Elements/
Arrangement
5000 @ 240V
7000 @ 240V
10000 @ 240V
15000 @ 240V
20000 @ 240V
25000 @ 240V
5000 @ 240V
7000 @ 240V
10000 @ 240V
15000 @ 240V
20000 @ 240V
25000 @ 240V
7000 @ 480V
10000 @ 480V
15000 @ 480V
20000 @ 480V
25000 @ 480V
7000 @ 600V
10000 @ 600V
15000 @ 600V
20000 @ 600V
25000 @ 600V
1
2/ Parallel
2 / Parallel
3/ Parallel
3 / Parallel
3 / Parallel
3 / Delta
3 / Delta
3 / Deta
3 / Delta
6 / Delta
6 / Delta
3 / Wye
3 / Wye
3 / Wye
6 / Wye
6 / Wye
3 / Wye
3 / Wye
3 / Wye
6 / Wye
6 / Wye
IV-PLACEMENT AND INSTALLATION
B-Cooling StartUp:
NOTE-The following is a generalized procedure and
does not apply to all thermostat control systems. Elec
tronic and ramping thermostat control systems may op
erate differently. Refer to operation sequence section of
this manual for more information.
Make sure that the unit is installed in accordance with the
installation instructions and all applicable codes. See ac
cessories section for conditions requiring use of the option
al roof mounting frame (RMF16).
V-ELECTRICAL CONNECTIONS
A-Power Supply
Refer to startup directions and refer closely to the unit wir
ing diagram when servicing. Refer to unit nameplate for
minimum circuit ampacity and maximum fuse size.
230/460/575 volt units are factory wired with orange wire
connected to control transformer primary. 208 volt units
are field wired with red wire connected to control transform
er primary.
WARNING
1- Set fan switch to AUTO or ON and move the system
selection switch to COOL. Adjust the thermostat to a
setting far enough below room temperature to bring on
the compressor.
2- Close unit disconnect switch. Compressor will start
and cycle with demand.
3- Refrigerant circuit is charged with HCFC-22 refriger
ant. See unit rating plate for correct amount of charge.
4- Refer to Refrigeration System Service Checks section
for proper method to check refrigerant charge.
C-Heating Startup:
Set room thermostat for proper heat or auto operation, if
switching subbase is used. Close disconnect switch and
position heat setpoint lever above room temperature. Re
fer to CHA16 unit installation instructions sections for addi
tional information on start-up operations and adjustments.
Electric shock hazard.
Can cause injury or death.
Singlephase units are equipped
with singlepole contactors. One
leg of compressor, capacitor and
condenser fan are always con
nected to line voltage. Turn off
power at disconnect before ser
vicing.
VII-REFRIGERATION SYSTEM
SERVICE CHECKS
B-Field Wiring
The charge should be checked during startup using the
method outlined below.
Unit and optional control field wiring is shown in the unit
diagram section of this manual.
A-Gauge Manifold Attachment
VI-STARTUP - OPERATION
Service gauge ports are identified in figures 10 and 9. At
tach gauge manifold high pressure line to liquid line gauge
port on thermometer well. Attach gauge manifold low pres
sure line to suction line service port.
A-Preliminary Checks
1- Make sure that the unit is installed in accordance with
installation instructions and applicable codes.
2- Inspect electrical wiring, both field and factory installed
for loose connections. Tighten as required.
3- Check to ensure that refrigerant lines are in good con
dition and do not rub against the cabinet or other refrig
erant lines.
4- Check voltage at the disconnect switch. Voltage must
be within the range listed on nameplate. If not, consult
the power company and have the voltage condition
corrected before starting the unit.
5- Recheck voltage with unit running. If power is not with
in range listed on unit nameplate, stop unit and consult
power company. Check amperage of unit. Refer to unit
nameplate for correct running amps.
NOTE - When unit is properly charged (whether by ap
proach or subcooling method) liquid line pressures
should approximate those given in table 18.
B-Charging
It is not recommended that the system be charged below
60°F (15°C). If charging below 60°F is required or if the
system is completely void of refrigerant, the recommended
and most accurate method of charging is to weigh refriger
ant into unit according to amount shown on unit nameplate
and in the specifications table. If weighing facilities are not
available or if the unit is just low on charge, use the follow
ing procedures:
Page 30
Unit Void of Refrigerant
TABLE 17
1- Connect an upright HCFC-22 drum to the center port
of gauge manifold. Purge air from connecting line.
Subcooling °F at Various Ambient Temps.
65°F 75°F
85°F
95°F 105°F 115°F
MODEL NO.
CHA16H-261
CHA16H-311
CHA16R-411
CHA16-411
2- Start unit.
3- Open drum valve and charge a quantity of refrigerant
gas into the system through the compressor suction
port, then close refrigerant drum valve. Allow unit to
run for a few minutes to stabilize operating pressure.
Determine correct charge as follows.
14
17
18
18
1- This method uses a thermometer inserted in thermom
eter well to check liquid temperature. Make sure well is
filled with oil before checking.
2- Allow unit to run for at least five minutes to stabilize
pressures.
CHA16H-261/311, CHA16-411/413
and CHA16R-411 ONLY
(CHA16-510/650 skip to step 6)
(Subcooling Method)
14
15
14
14
12
12
12
12
8
9
8
8
IMPORTANT
3- If ambient temperature is above 60°F (15°C), place
thermometer in well and read temperature.
Potential for improper charging.
Can result in improper operation or component
failure.
4- Read liquid line pressure from gauge and convert to
condensing temperature using standard HCFC-22
temperature/pressure conversion chart (or conversion
scale on gauge).
Use table 18 as a general guide for performing
maintenance checks. When unit is properly
charged (whether by approach or subcooling
method) line pressures should approximate those
given in table 18. Table 18 is not a procedure for
charging the system. Minor variations in these
pressures may be expected due to differences in
installations. Significant deviations could mean
that the system is not properly charged or that a
problem exists with some component in the sys
tem. Used prudently, table 18 could serve as a
useful service guide.
5- The difference between the liquid line temperature
(from step 3) and the conversion temperature (from
step 4) is subcooling (subcooling = conversion temp.
minus liquid temp.). Subcooling temperature should
approximate the values given in table 17. Add refriger
ant to increase subcooling and remove refrigerant to
reduce subcooling.
TABLE 18
NORMAL OPERATING PRESSURES
75 °F
14
16
16
16
CHA16-511/513
CHA16-651/653
CHA16R-511 and CHA16R-651 ONLY
(Approach Method)
6- Check ambient (outdoor) temperature.
7- If ambient temperature is above 60°F (15°C), place
thermometer in well and read temperature.
8- Approach temperature is the difference between am
bient and liquid line temperatures (Approach = liquid
minus ambient.) Approach temperature should be 4°F
(2°C) for CHA16-511/513 and CHA16R-511 units. Ap
proach temperature should be 9°F (5°C) for
CHA16-651/653 and CHA16R-651 units. Refrigerant
must be added to lower approach temperature. Re
move refrigerant from system to increase approach
temperature.
CHECKING CHARGE
ALL UNITS
65 °F
14
17
18
18
85 °F
95 °F
115 °F
105 °F
MODEL NO.
LIQ.
+ 10
PSIG
SUC.
+5
PSIG
LIQ.
+ 10
PSIG
SUC.
+5
PSIG
LIQ.
+ 10
PSIG
SUC.
+5
PSIG
LIQ.
+ 10
PSIG
SUC.
+5
PSIG
LIQ.
+ 10
PSIG
SUC.
+5
PSIG
LIQ.
+ 10
PSIG
SUC.
+5
PSIG
CHA16H-261
CHA16H-311
170
171
69
63
198
201
73
69
226
223
77
76
261
266
82
80
295
302
83
83
329
339
86
86
CHA16-411/413
CHA16R-411
CHA16-511/513
CHA16R-511
163
64
187
69
216
74
253
78
296
83
332
87
159
71.8
187
73.4
216
75.2
248
77
283
78.8
321
80.7
CHA16-651/653
CHA16R-651
153
69.3
181
70.2
211
72.1
244
74
280
75.8
319
77.6
Page 31
VIII-INDOOR BLOWER
OPERATION / ADJUSTMENT
C-Blower Speed Adjustment
208v/230v ONLY
TABLE 19
A-Blower Operation
NOTE - The following is a general procedure and does
not apply to all thermostat control systems.
1- Blower operation is dependent on thermostat control
system option that has been installed in the CHA16.
Refer to Control System Options" section for detailed
descriptions of blower operation.
2- Generally, blower operation is set at the thermostat
subbase fan switch. With the fan switch in the ON"
position, the blower operates continuously. With the
fan switch in the AUTO" position, the blower cycles
with demand (or, with some control systems, runs con
tinuously while the heating or cooling circuits cycle).
3- In most cases, the blower and entire unit will be off
when the system switch is in the OFF" position. The
only exception is immediately after a heating demand
until blower control switches off.
All -261, -311, -411 and
-413 units (208/230V only)
have four speed leadless
blower motors. The speed
ports are arranged as
shown in table 19.
All -511, -513, -651 and -653
units (208/230V only) have
five speed leadless blower
motors. The speed ports are
arranged as shown in table
20.
TABLE 20
FIVE SPEED BLOWER MOTOR
Speed
Tap Number
Low
Medium-Low
Medium
Medium-High
High
Common
6
5
4
3
2
1
Blower speed selection is accomplished by changing the
taps in the harness connector at the blower motor (see fig
ure 27). Blower speeds are shown in table 21.
TABLE 21
B-Determining Unit CFM
1- The following measurements must be made with a dry
indoor coil. Run the blower without the cooling de
mand. Air filters must be in place when measurements
are taken.
2- Measure static pressure external to the unit (from sup
ply to return).
Unit
-261
-311
-411-50
-411-100
-413-50
-413-100
-511
-513
-651-75
-651-125
-653-75
-653-125
To Measure Discharge Static Pressure:
a-Measure tap locations as shown in figure 25.
b-Punch a 1/4" diameter hole.
Insert manometer hose
flush with the inside edge of
hole or insulation. Seal
around hole with perma
gum. Connect zero end of
manometer to the dis
charge (supply) side of sys
tem. Connect other end of
manometer to return duct
as above.
FOUR SPEED BLOWER MOTOR
Speed
Tap Number
Low
5
Medium-Low
4
Medium-High
3
High
2
Common
1
STATIC PRESSURE
TAP LOCATIONS
208v/230v FACTORY SET BLOWER SPEED
Cool (port)
Heat(port)
208v
230v
High (2)
High (2)
Med-Hi (3)
Med-Hi (3)
Med-Hi (3)
Med-Hi (3)
Medium (4)
Medium (4)
Med-Hi (3)
Med-Hi (3)
Med-Hi (3)
Med-Hi (3)
High (2)
High (2)
Med-Lo (4)
Med-Hi (3)
Med-Lo (4)
Med-Hi (3)
Med-Lo (4)
Med-Lo (5)
Medium (4)
Medium (4)
Medium (4)
Medium (4)
Med-Hi (3)
Med-Hi (3)
Low (5)
Med-Lo (4)
Low (5)
Med-Lo (4)
Medium (4)
Medium (4)
Med-Lo (5)
Med-Lo (5)
Med-Lo (5)
Med-Lo (5)
Each motor port in a leadless motor (figure 27) is analogous
to speed taps (pigtails) used in previous Lennox units. Each
motor is capable of four or five different speeds depending on
unit (refer to unit wiring diagram).
UNIT
MANOMETER
FIGURE 25
c-With only the blower motor running, observe the ma
nometer reading.
d-Seal around the hole when check is complete.
3- The CFM can be adjusted by changing the motor
speed taps. Follow the blower speed change instruc
tions below.
Each unit is factory wired to provide a single cooling speed
and a single heating speed. The speeds can be changed
by moving the cooling wire or the heating wire to a different
port at the harness connector.
Heating Speed:
Factory blower speeds are listed in a table on the unit wir
ing diagram. Adjust the blower heating speed for proper air
temperature rise (listed on unit rating plate).
Page 32
To measure temperature rise, place thermometers in sup
ply and return air plenums. Turn up thermostat to start unit.
After plenum thermometers have reached their highest
and most steady readings, subtract thermometer read
ings. The difference should be in the range listed on unit
rating plate. If temperature is high, wire blower to a higher
speed; if temperature is too low, wire blower to a slower
speed. Repeat this procedure until desired temperature
rise is obtained.
Cooling Speed:
Factory blower speeds are listed in a table on the unit wir
ing diagram. Blower performance tables are listed in the
first section of this manual. Section VIII-B-Determining
Unit CFM" shows how to measure discharge static pres
sure. Once discharge static pressure has been deter
mined, compare the value to the blower performance
tables listed in the first section of this manual. If CFM is low,
wire the blower to a higher speed; if CFM is high, wire the
blower to a lower speed. Repeat this procedure until de
sired CFM is reached.
The motor is equipped with speed leads (taps) for changing
motor speed. Taps are routed through jackplug J43/P43 and
then connected to harness plug P38 along with line voltage
wires from blower relay (see figure 26). Jackplug J43/P43 al
lows motor to be disconnected from harness in case of a motor
failure. If the motor should fail, it can be easily disconnected at
J43/P43, the new motor can then be connected at the same
plug and no field wiring is required. Jumper J38 then com
pletes the circuit from the unit to the blower motor and provides
the proper heating and cooling speeds. J38 also provides the
necessary blue leg" circuit which 460V motors require (refer
to figure 26 for more information). Blower speed selection is
accomplished by changing the harness jumperplug in the
harness connector at the blower motor).
Three J38 jumperplugs are provided with the unit. Each
provides the speeds marked on the jack (Hi-Cool/Lo-Heat,
Med-Cool/Med-Heat or Hi-Cool/Med-Heat) and the blue
leg" circuit referred to in figure 28.
BLOWER SPEED TAP SELECTION
460V and 575V UNITS
J43/P43
D-Blower Speed Adjustment
460V and 575V Units
Late Production ONLY
TABLE 22
All 460V and 575V units
460/575V BLOWER MOTOR
have three speed blower Speed
Tap Color
motors with pigtail leads Low
Red
Yellow
(taps). The taps are ar Medium
High
Black
ranged as shown in table Internal Circuit
Blue
22. Both 460V and 575V Common
Orange
units use a 460V PSC single phase blower motor. 575V
units use a step-down transformer in the unit control box to
provide 460V to the motor.
BLOWER
MOTOR
P38
BLOWER
J38
Three J38 jumpers are provided with the unit. Each is marked
with different speeds. To change blower speeds, disconnect the
installed J38 jumper and install one of the other J38 jumpers.
FIGURE 26
BLOWER SPEED TAP SELECTION
208/230V UNITS
1
2
PORT
UNIT
HARNESS CONNECTOR
3
BLOWER MOTOR
4
TAB
5
6
MOTOR HARNESS
CONNECTOR PORTS
DISCONNECT HARNESS PLUG. DEPRESS TAB TO RE
LEASE WIRE CONNECTOR. SELECT NEW SPEED PORT.
INSERT WIRE UNTIL CONNECTOR CLICKS IN PLACE.RE
CONNECT HARNESS PLUG TO MOTOR.
FIGURE 27
Page 33
CHA16 460V BLOWER COMPARTMENT
EARLY PRODUCTION UNITS
460 VOLTAGE BLOWER MOTOR
NOTE This is a generalized diagram.
Unit jackplugs are not shown.
Blue
B3
K3-2
2
L1
Black-high
K3-2
5
8
Red-low
Yellowmed
Electric
Heat Relay
K3-3
Orange-common
K3 = COOLING BLOWER RELAY
L3
J43/P43 JACKPLUG
DO NOT CHANGE SPEED TAPS HERE
CHANGE SPEED TAPS AT PIGTAILS
LOCATED IN CONTROL BOX
NOTE-The blue tap on 460 voltage motors is not a speed tap. It is
used to complete an internal circuit when operating in medium or
low speed. This switching is accomplished by blower relay K3.
DO NOT CONNECT THE BLUE TAP TO LINE VOLTAGE OR
MOTOR DAMAGE WILL RESULT.
FIGURE 29
FIGURE 28
Use the steps outlined in the previous section (Blower
Speed Adjustment 208V/230V Only) to determine which
J38 jumper to use.
CHA16 460V CONTROL BOX
EARLY PRODUCTION UNITS
SPEED TAP CHANGES ARE MADE IN THE CONTROL BOX.
UNIT IS FACTORY WIRED FOR HIGH SPEED COOLING
(BLACK MOTOR WIRE TO BLACK UNIT WIRE) AND LOW
SPEED HEATING (YELLOW MOTOR WIRE TO YELLOW
UNIT WIRE). RED (LOW SPEED TAP) IS NOT USED.
CAUTION
Potential for damage to 460V and 575V blower mo
tors and/or unit electrical circuits.
TO CHANGE BLOWER SPEEDS,
REFER TO FIGURES 31, 32 and 33.
The blue blower motor lead must never be con
nected to a line voltage power lead (blower de
mand from heat relay or blower relay). Refer to
unit wiring diagram for proper wiring.
Red
Low
Can result in improper operation, increased cur
rent flow and/or burnt windings.
Yellow
Medium
E-Blower Speed Adjustment
460V and 575V Units
Early Production ONLY
Black
High
Early production units use the same 460V blower motor but
are not equipped with the J38/P38 jackplug for changing
blower speeds. Blower motor wires are routed back to the
unit control box where the wires end in pigtails. Blower mo
tor speed can then be changed by rearranging the pigtail
connections.
Page 34
Blue
Internal Circuit
Orange
Common
FIGURE 30
FIELD CHANGE OF BLOWER SPEED TAPS
TO
MEDIUM SPEED COOLING
and
MEDIUMMedium
SPEED
HEATING
High
Speed
Speed
Low Speed
IMPORTANT
Potential for unit damage.
Although 460v units are equipped with a three
speed blower motor, units are not designed or ap
proved for low speed blower operation. Low
speed (red) tap should never be connected.
Winding
J43/P43 1
Can result in excessive heat exchanger tempera
ture rise resulting in component damage.
High Speed
Winding
J43/P43 1
Medium Speed
Winding
2
4
Black
High
Blue
Orange
Common
Black
High
Blue
8
Black
High
Yellow
Medium
Black
High
Blue
8
Electric Heat
Relay
2
K3-2
Blower Relay
J2/P2-7
5
9
Electric Heat
Relay
K3-3
Blower Relay
IX-MAINTENANCE
WARNING
FIELD CHANGE OF BLOWER SPEED TAPS TO
HIGH SPEED COOLING/HIGH SPEED HEATING
Electric shock hazard.
Can cause injury or death.
Low Speed
Winding
Medium Speed
Winding
3
Turn off electrical power to unit
before performing maintenance
or service operation on the unit.
5
Yellow
Medium
Blue
L1
FIGURE 33
FIGURE 31
4
3
L3
7
3
L1
2
Red
Low
9
9
Black
High
Yellow
Medium
J2/P2-9
K3-3
Blower Relay
Orange
Common
5
Yellow
Medium
Red
Low
J2/P2
5
J43/P43 1
3
Yellow
Medium
2
High Speed
Winding
Winding
Blue
Orange
Common
5
K3-2
Blower Relay
L3
4
Low Speed
Winding
3
Orange
Common
2
Orange
Common
FIELD CHANGE OF BLOWER SPEED TAPS TO
HIGH SPEED COOLING/MEDIUM SPEED HEATING
Winding
Red
Low
WARNING
Sharp metallic edges.
Blue
Orange
Common
Yellow
Medium
Black
High
Be careful when servicing unit to avoid accidental
contact with sharp metallic edges which may re
sult in injury.
J2/P2-9
8
Electric Heat
Relay
2
K3-2
Blower Relay
5
J2/P2-7
9
K3-3
Blower Relay
3
L3
L1
A-Filters
CHA16 units require field provided field installed filters. Fil
ters should be installed in return air duct. A filter kit is avail
able for downflow discharge applications. Filters should be
checked monthly (or more frequently in severe use) and
cleaned or replaced regularly. Take note of AIR FLOW DI
RECTION" marking on the filter frame when re-installing.
NOTE - Filters must be U.L.C. certified or equivalent for
use in Canada.
FIGURE 32
Page 35
B-Lubrication
A tethered pin is inserted in the bracket and through a hole
Supply Air Motor Bearings - Bearings are prelubricated; no
further lubrication is required.
Condenser Fan Motor Bearings - Bearings are prelubricated
for extended life. No further lubrication is needed.
in the base channel of the unit. The pin is used only to hold
the bracket in place; it does not support any weight. The
bracket bottom lip supports the weight of the unit.
TABLE 23
C-ECH16 and ECH16R Series Electric Heat
Unit
ECH16 and ECH16R electric heaters are used as primary
heat for CHA16 series units. Heating elements and fuses
should be inspected yearly. If cracked or broken elements
are found, the element should be replaced. See Lennox
Repair parts for electric heat coil replacement kit.
D-Evaporator Coil
Maximum Unit Weight
380 Lbs.
CHA16H-261/311-50/75
CHA16-411/413-50/100
CHA16R-411-50/100
CHA16-511/513/651/653-125
CHA16-651/653-75
CHA16R-511/651-125
CHA16R-511-75
500 Lbs.
650 Lbs.
1- Clean coil, if necessary.
2- Check connecting lines and coil for oil leaks.
3- Check condensate drain pan and line, if necessary.
If unit must be lifted for service, use only lifting lugs and
E-Condenser Coil
lifting. To prevent cabinet damage never use chains for lift
1- Clean and inspect condenser coil. (May be flushed
with a water hose.)
2- Inspect connecting lines and coils for oil leaks.
NOTE-If owner complains of insufficient cooling, unit
should be gauged and refrigerant charge checked. Re
fer to Checking Charge section.
ing unit.
cables with spreader bars to lift unit. Table 23 shows maxi
mum unit weight. Figure 35 shows how to rig the unit for
RIGGING UNIT FOR LIFTING
SPREADER BARS
Lifting Point Should
Be Directly Above
Center Of Gravity.
F-Electrical
1- Check all wiring for loose connections.
2- Check for correct voltage at unit (unit operating).
3- Check amp-draw on both condenser fan motor and
blower motor.
Fan Motor Rating Plate ____ Actual ________
Indoor Blower Motor Rating Plate____ Actual____
UNIT
FIGURE 35
X-ACCESSORIES
This section describes the application of most of the op
tional accessories which can be connected to the CHA16.
Some of the accessories (for example, the Warm Up Con
trol Kit) are described in the operation sequence section of
this manual.
Optional lifting lug kit consists of
four brackets like that shown in
figure 34. Brackets are used to
lift unit during installation or
when servicing. Lugs are factory
furnished and field installed in
commercial units and are option
al field installed in residential
units. Lifting lugs can be re
moved from unit and reused.
B-RMF16 Mounting Frame
When installing a CHA16 unit
on a combustible surface for
downflow discharge applica
A-Lifting Lugs
LIFTING LUG KIT
MOUNTING
BRACKETS
FOR LIFTING
RMF16
MOUNTING FRAME
tions, RMF16 roof mounting
(figure 36) frame is required.
Otherwise, the RMF16 is rec
ommended but not required.
The CHA16, if not mounted
on a flat (roof) surface, MUST
FIGURE 36
be supported under all edges and under the middle of the
FIGURE 34
unit to prevent sagging. The CHA16 MUST be mounted
level within 1/16" per linear foot in any direction.
Page 36
The assembled RMF16 mounting frame is shown in figure
36. Refer to the RMF16 installation instructions for details of
proper assembly and mounting. The roof mounting frame
MUST be squared to the roof before mounting. Plenum sys
tem MUST be installed before unit is set on mounting frame.
Refer to the RMF16 installation instructions for proper ple
num construction.
A total of eight different economizers are available
for CHA16 commercial units. Table 24 describes the
economizers which are available.
2-REMD16 Downflow Economizer
REMD16M Downflow Economizer
TYPICAL FIELD FABRICATED
MOUNTING FRAME
The REMD16 and REMD16M economizers (figure
UNIT
CHA16s. The economizer opens a set of dampers to
38) are designed for use with standard (downflow)
allow 0 to 100 percent outdoor air to be used for cool
ing when outdoor humidity and temperature are ac
ceptable. Additional (2nd stage) cooling demand is
directed to the compressor while the dampers re
main open. If outdoor air becomes unacceptable,
MOUNTING
FRAME
the outdoor air dampers close to a predetermined
FIGURE 37
minimum position while the compressor cooling cir
Many types of roof framing or supports can be used to
mount the CHA16 unit, depending upon different roof
structures. A typical field fabricated roof mounting frame is
shown in figure 37.
C-Economizers
REMD16(M) and EMDH16(M) economizers can
only be applied to CHA16 commercial units.
CHA16R (residential) units are not equipped with
the necessary wiring hardware and therefore cannot
accept the economizers.
CHA16H units are not designed to accept economiz
ers and are not equipped with the necessary wiring.
An REMD16M or REMD16 can be field installed in a
CHA16H if necessary by using a RDE16-41 down
turn transition. This application is covered in more
detail later in this section.
TABLE 24
CHA16 ECONOMIZERS (2-5 TON UNITS)
Economizer
Type
REMD16-41
Three Position Downflow
REMD16-65
Modulating Downflow
Three Position Downflow
REMD16M-65
Modulating Downflow
EMDH16-41
EMDH16M-41
Three Position Horizontal
Modulating Horizontal
EMDH16-65
Three Position Horizontal
EMDH16M-65
REMD16 DOWNFLOW ECONOMIZER
REMD16M DOWNFLOW ECONOMIZER
OUTDOOR AIR
DAMPERS
1-Application
REMD16M-41
cuit cycles as needed.
Modulating Horizontal
Unit
Matchup
CHA16H-261
CHA16H-311
CHA16-410
CHA16H-261
CHA16H-311
CHA16-410
CHA16-510
CHA16-650
CHA16-510
CHA16-650
CHA16-410
CHA16-410
CHA16-510
CHA16-650
CHA16-510
CHA16-650
ENTHALPY CONTROL
TYPICAL
(REMD16M shown)
CONTROL ACCESS
COVER
DAMPER MOTOR
OUTDOOR AIR
DAMPER HOOD
FACTORY INSTALLED
RETURN AIR FILTER
RETURN AIR
DAMPERS
FIGURE 38
Refer to the REMD16-41/65 Installation Instruction
Manual for specific details regarding installation. Re
fer to the sequence of operation flowcharts (in back
of this manual) for detailed operation of the econo
mizer. The sequence of operation flowcharts also
describe how the economizer interacts with the
CHA16 and the control system being used.
Page 37
REMD16M PARTS ARRANGEMENT
ENTHALPY CONTROL
ACCESS COVER
REMOTE
MOUNTING BASE
DAMPER MOTOR
MIXED AIR
SENSOR
NOTE - Mixed air sensor is shown
as it is factory installed in an
REMD16M-41. REMD16M-65 is
similar. Mixed air sensor should
be removed from economizer and
installed in supply air stream as
shown in figure 44.
REMD16 PARTS ARRANGEMENT
ACCESS COVER
ENTHALPY CONTROL
OUTDOOR AIR DAMPERS
MIXED AIR
SENSOR CONTROL
DAMPER MOTOR
MIXED AIR
SENSING BULB
NOTE - Mixed air sensor and
sensing bulb are shown as they
are factory installed in an
REMD16-41. REMD16-65 is simi
lar. Mixed air sensor should be re
moved from economizer and
installed in unit blower compart
ment and sensing bulb should be
installed in supply air stream as
shown in figure 44.
RETURN AIR DAMPERS
FIGURE 39
Page 38
EMDH16M PARTS ARRANGEMENT
OUTDOOR AIR DAMPERS
ACCESS COVER
REMOVED
NOTE - Mixed air sensor is shown as
it is factory installed in an
EMDH16M-41. EMDH16M-65 is
similar. Mixed air sensor should be
removed from economizer and
installed in supply air stream as
shown in figure 44.
OUTDOOR DAMPER
HOOD
MIXED AIR SENSOR
ENTHALPY SENSOR
DAMPER MOTOR
TRANSITION
RETURN AIR DAMPERS
RETURN DUCT
FLANGE
ENTHALPY CONTROL
on REMOTE
MOUNTING BASE
WIRING HARNESS
(connects to jackplug in
blower compartment)
FILTER
EMDH16 PARTS ARRANGEMENT
OUTDOOR AIR DAMPERS
NOTE - Mixed air sensor and sensing
bulb are shown as they are factory
installed
in
an
EMDH16-41.
EMDH16-65 is similar. Mixed air sen
sor should be removed from economiz
er and installed in unit blower compart
ment and sensing bulb should be
installed in supply air stream as shown
in figure 44.
OUTDOOR DAMPER
HOOD
ACCESS COVER
REMOVED
ENTHALPY SENSOR
TRANSITION
DAMPER MOTOR
WIRING HARNESS
(connects to jackplug in
blower compartment)
RETURN AIR DAMPERS
RETURN DUCT
FLANGE
MIXED AIR
SENSING BULB
MIXED AIR
SENSOR CONTROL
FIGURE 40
Page 39
ENTHALPY CONTROL
FILTER
3-EMDH16 Horizontal Economizer
4-Economizer Operation
EMDH16M Horizontal Economizer
a-Enthalpy Control: Setpoint Control
The EMDH16 and EMDH16M economizers (figure
The key to economizer operation is the enthalpy con
trol. The enthalpy control senses total heat content in
outside air (temperature plus humidity) and uses that
information to control the amount of outside air
brought into the system. When the outside air en
thalpy is below the control setpoint, the control actu
ates a motor which in turn adjusts outdoor dampers
to meet cooling demands of the building. When the
heat content rises above control setpoint, the control
de-activates and dampers close to preset minimum
(not closed) position.
41) operate like the REMD16 and REMD16M except
they are designed for CHA16 units requiring hori
zontal discharge and return air. Internal components
and operation of the horizontal economizer are iden
tical to the downflow economizer.
Refer to the EMDH16-41/65 Installation Instruction
Manual for specific details regarding installation.
Refer to the sequence of operation flowcharts (in
ENTHALPY CHART
back of this manual) for detailed operation of the
economizer. The sequence of operation flowcharts
also describe how the economizer interacts with the
CHA16 and the control system being used.
CHART
CURVE
CONTROL
POINT 50%
°F RH °C
A
B
73
70
23
21
C
D
67
63
19
17
EMDH16 HORIZONTAL ECONOMIZER
EMDH16M HORIZONTAL ECONOMIZER
FACTORY
OUTDOOR AIR
INSTALLED
DAMPERS
TRANSITION
(under hood)
OUTDOOR AIR
DAMPER HOOD
° °
RETURN AIR
DAMPERS
CONTROL ACCESS
COVER REMOVED
FACTORY INSTALLED
RETURN AIR FILTER
FIGURE 42
FIGURE 41
The physical location of controls in REMD16M and
REMD16 economizers is shown in figure 39. The
physical location of controls in EMDH16M and
EMDH16 economizers is shown in figure 40.
Page 40
Two types of adjustment may be made at the control.
The first is the control setpoint. The setpoint deter
mines the temperature and humidity conditions at
which the outdoor air dampers will open and close.
The recommended setpoint is A." If the economizer
is allowing air which is too warm or too humid into the
system, the control may be changed to a lower set
point (B,C or D). Refer to enthalpy chart figure 42.
Example:
If the enthalpy control is set at setpoint A" as shown in
figure 42, the following situation could occur. A cooling
demand when the outside air is at 75° and 20 percent
humidity would drive the economizer outdoor air damp
ers open to utilize outdoor air for cooling. The compres
sor cooling circuit would be disabled. However, if the
outdoor air should change to 70°F (a drop in tempera
ture) and 70 percent humidity (a dramatic rise in humid
ity), the total heat content" of the outdoor air would rise
above the enthalpy control setpoint and de-activate the
damper motor to the preset minimum position. If cool
ing demand is still present when the total heat of the
outside air rises above the control setpoint, cooling de
mand is routed from the economizer to the compressor
cooling circuit.
ENTHALPY SENSOR
ALL ECONOMIZERS
ENTHALPY
SENSOR
OUTDOOR
AIR DAMPERS
DAMPER HOOD
b-Minimum Positioner
The second type of adjustment which may be made
at the control is the minimum position of the outdoor
damper blades. Each economizer has a minimum
positioner switch (potentiometer) which allows the
outdoor dampers to be adjusted to a preset mini
mum position. This allows a preset amount of air ex
change at all times during unit operation. When unit
operation stops, the dampers drive fully closed. The
potentiometer is located on the enthalpy control face
(modulating economizer) or on the damper motor
(three position economizer.)
c-Enthalpy Sensor
The enthalpy sensor is located on the outside por
tion of the outdoor damper blades (as shown in fig
ure 43). The sensor monitors the total heat content of
the outdoor air (temperature plus humidity) and
sends the information to the enthalpy control. The
enthalpy control uses the information to determine if
outdoor air can be used for cooling.
FIGURE 43
d-Mixed Air Sensor
The sensor measures the resultant temperature of
the mixed air downstream of the evaporator coil.
The mixed air temperature is used by the enthalpy
control when outdoor dampers are open to help de
termine whether outdoor air dampers should close.
Modulating economizers are equipped with a single
mixed air sensor. Three position economizers are
equipped with a separate sensor (switch) and sens
ing bulb which are connected by a cap tube.
The mixed air sensor (bulb) is located in the supply
air stream. The sensor (modulating economizer) or
sensing bulb (three position economizer) fits
through a factory supplied hole in the panel dividing
the unit return and supply air (see figure 44). The
three position economizer sensor (switch) mounts to
pre-drilled holes in the unit panel dividing return and
supply air.
e-Wiring, Installation, Maintenance
The economizer uses a harness plug to connect to
the CHA16's harness connector located in the blow
er compartment. Refer to figure 45 for REMD16
installation or figure 46 for EMDH16 installation. Al
though a harness connector is used to connect the
CHA16 to the economizer, the economizer electri
cally connects to the CHA16 differently depending
on which control system has been installed. The dif
ferent electrical connections are made in relay kits
Page 41
and controls located in the control area of the blower
compartment. All connections are made with quickconnect type harness connectors. For specific de
tails of economizer wiring and operation, refer to the
sequence of operation section of this manual.
MIXED AIR SENSOR
CHA16 UNIT
SUPPLY
AIR
SENSOR HOLE
LOCATION
Figure 45 shows how an REMD16 is installed in a
CHA16 cabinet. Figure 46 shows how an EMDH16 is
installed in a CHA16 cabinet. For detailed installa
tion and maintenance instructions, refer to the
REMD16-41/65 Installation Instruction Manual or
the EMDH16-41/65 Installation Instruction Manual.
CONTROL
HARNESS
REMD16 INSTALLATION
BLOWER
COMPARTMENT
REMD16M and EMDH16M
MIXED AIR SENSOR
INSTALLATION
DOWNFLOW
RETURN AIR OPENING
REMD16
or
REMD16M
FIGURE 45
CONTROL
HARNESS
EMDH16 INSTALLATION
MIXED AIR
SENSOR
UNIT
REMD16 and EMDH16
MIXED AIR SENSOR
INSTALLATION
EMDH16
or
EMDH16M
FIGURE 46
CONTROL
HARNESS
MIXED AIR
SENSOR
f-Modulating Damper Motor Check
Honeywell W7459A
CAP
TUBE
1- Disconnect main power to the CHA16.
2- Turn thermostat control to OFF position (occu
pied mode).
SENSOR
BULB
3- Install jumper across terminals 6-9 on blower
relay in unit control box.
4- Install jumper across enthalpy control termi
nals T and T1. See figure 47 for terminal loca
tion.
FIGURE 44
Page 42
5- Restore power to unit. Outdoor damper should
drive to fully open position (60 to 90 sec. re
quired for full travel). Observe travel for proper
damper operation.
6- Disconnect power to the unit. Outdoor damper
should spring return to closed position.
MODULATING
SOLID STATE ENTHALPY CONTROL
TR
B
C
A
D
7- Disconnect power to unit and remove jumper.
Replace all panels.
8- Restore power to unit. Outdoor damper should
drive to mid (minimum) position (requires
approximately 90 seconds for full travel). Ad
just minimum position by turning thumb wheel
on damper motor.
THREE POSITION
SOLID STATE ENTHALPY CONTROL
TR1
+
B
TR
C
+
A
SO
D
+
SR
+
5
TR1
5
1
2
MINIMUM 3
POSITIONER
4
T
T1
P
P1
1
2
3
4
X
6
LED
D
LED
FIGURE 47
FIGURE 48
7- Remove T and T1 jumper then restore power
to the unit. Outdoor damper should drive to
minimum position. Adjust minimum damper
position pot located on control. See figure 47.
8- Disconnect power to unit and remove jumper
on blower relay terminals 6-9. Replace all pan
els. Restore power to unit.
g-ThreePositionDamperMotorCheck
Honeywell W7459C
1- Disconnect main power to the CHA16.
2- Remove the control access cover (see figures
39 and 40).
3- Install jumper across enthalpy control termi
nals D and TR1. See figure 48 for terminal
location.
4- Restore power to unit. Outdoor damper should
drive to fully open position (requires approxi
mately 90 seconds for full travel). Observe
travel for proper damper operation.
5- Disconnect power to unit. Damper should
spring return to closed position.
6- Remove jumper installed in step 3. Install
jumper across enthalpy control terminals X
and TR1. See figure 48 for terminal location.
Page 43
h-Warm Up Kit
An optional warm up kit may be added to either
REMD16 or EMDH16 economizer (except CHA16s
using a Honeywell W7400 Control System). The
Warm Up Kit holds the dampers closed during night
setback and morning warm up. When the first ther
mostat demand of the day is satisfied, the warm up
kit opens the outdoor dampers to minimum position.
The warm up kit mounts to the CHA16 in the control
mounting area of the blower compartment. The kit
plugs into the unit wiring harness inline between the
unit and the economizer. For detailed wiring and op
eration, refer to the sequence of operation section of
this manual.
i-Night Relay
Optional night relay must be added to economizer
when night setback functions are desired with W973
or electromechanical control systems. Kit includes a
DPDT relay which is hard-wired to the economizer
harness.
If a W973 system is used, the relay holds the outdoor
dampers closed during setback. If an electrome
chanical thermostat system is used, the relay holds
the outdoor dampers closed during setback, de-en
ergizes the indoor thermostat and energizes the set
back thermostat. Night relay is not required for any
other control system. Field wiring is shown in the fol
lowing section section of this manual. Night relay
wiring diagram designation is K11.
D-OAD16 Outdoor Air Damper
The OAD16 outdoor air
OAD16
FRESH
damper section (figure
AIR DAMPER
49) installs in the
CHA16R or CHA16 to al
low a fixed amount of out
LOOSEN
side air into the system.
SCREWS AND
SLIDE DOWN
The OAD16 replaces the
TO ALLOW
unit side panel where a
MORE AIR INTO
SYSTEM
downflow economizer
would normally be
installed. The dampers
FIGURE 49
may be manually ad
justed and locked in place
to allow up to 25 percent outside air into the system at all
times. Refer to the OAD16 installation instruction manual
for specific installation procedure. The washable filter sup
plied with the OAD16 can be cleaned with water and a mild
detergent. It should be sprayed with Filter Handicoater
when dry prior to reinstallation. Filter Handicoater is R.P.
Products coating no. 418 and is available as Lennox Part
No. P-8-5069.
E-RDE16-41 Duct Enclosure for
REMD16-41 and REMD16M-41
Economizer Limited Application
CHA16H Series Units Only
CHA16H may be converted to downflow operation by add
ing an RDE16-41 downturn transition and RMF16-41 roof
mounting frame as shown in figure 53. A manual outdoor
air damper is factory provided with the RDE16. The damp
er is located in the access panel covering the economizer
opening. The damper provides a field set amount of out
door air exchange (0 to 25%) at all times.
REMD16-41 (or REMD16M-41) economizer may be used
with CHA16H units in a limited downflow only application.
However, neither economizer can be directly mounted to
CHA16H. The RDE16-41 duct enclosure must be used to
provide the proper opening for economizer. Duct enclo
sure RDE16-41 mounts to the CHA16H horizontal air
openings and the economizer slides in the RDE16-41
economizer opening (see figure 50 for installation).
REMD16-41 / REMD16M-41 TO CHA16H INSTALLATION
SUPPLY AIR
RETURN AIR
RDE16-41
UNIT
REMD16-41 or
REMD16M-41
REMOVE PANEL
TO INSTALL
ECONOMIZER
RMF16-41
FIGURE 50
Page 44
CHA16H TO REMD16(M)-41 ECONOMIZER
FIELD WIRING - WIRE ROUTING
J3/P4
ECONOMIZER HARNESS
REMD16(M)-41
ECONOMIZER
WIRING HARNESS
SUPPLIED
WITH RDE16-41
RDE16-41 TRANSITION
CHA16H UNIT
(B" SECTION WIRING DIAGRAM)
HEATING
COMPARTMENT
ECONOMIZER
PIGTAILS
SEE C19 TO B34
WIRING DIAGRAM
(BACK OF THIS
MANUAL)
CONTROL BOX
COMPRESSOR
COMPARTMENT
FIGURE 51
CHA16H TO REMD16-41 or REMD16M-41 ECONOMIZER
FIELD WIRING
RH
RC
INDOOR
THERMOSTAT
SEE C19 TO B34
WIRING DIAGRAM
(BACK OF THIS MANUAL)
NOTE - ALL FIELD WIRING IS
IN ADDITION TO FACTORY
WIRING AND UNIT FIELD WIR
ING EXCEPT WHERE NOTED.
ACC
CHA16H
PIGTAILS
S12
NIGHT STAT
R
G
Y1
W1
C
L1
L2
G
W1
K11 OPTIONAL
REQUIRED IF NIGHT
SETBACK IS DESIRED.
REMOVE (SPLICE INTO)
FACTORY WIRE.
W2
CMC3-1
CLOCK
Y2
Y1
X
6
THERMOSTAT TO ECONOMIZER - 2 WIRES
UNIT TO ECONOMIZER - 5 WIRES
UNIT TO THERMOSTAT - 3 WIRES
FIELD WIRING
FIELD WIRING REQUIRED
FOR NIGHT SETBACK
FACTORY WIRING
10
3
1
15
4
12
13 14
2
8
9
5
J3 ECONOMIZER JACK
INSIDE RDE16-41 TRANSITION
MATES TO ECONOMIZER PLUG P4
11
7
9
6
3
4
1
ECONOMIZER
FIGURE 52
Page 45
7
K11
RDE16 DUCT ENCLOSURE
The CHA16H is not facto
ry equipped with the nec
essary wiring needed to
UNIT
RDE16
connect an REMD16-41
or REMD16M-41. To
compensate for the lack
of unit harness, an econ
FACTORY
omizer harness is pro
INSTALLED
vided in the RDE16-41.
FRESH AIR
The economizer con
RMF16-41 DAMPER
nects to the RDE16-41
FIGURE 53
harness using jackplugs.
The RDE16-41 uses pigtails to hard-wire the economizer
harness to the unit. Field wire routing is shown in figure 51.
Field wiring is shown in figure 52.
The kit includes rails which install in the blower compart
ment and allow the (one inch thick) filter (furnished) to slide
in. Two kits are available. DF16-41 (figure 54) installs in
-410 units and DF16-65 (figure 55) installs in -510/-650
units.
DF16-65 DOWNFLOW FILTER KIT
SECURING
SCREW
LEFT FILTER
BRACKET
Optional compressor crankcase heater is available for field
installation in any residential unit (208/230v only). The
heater is a 45 watt belly band type and is wired directly to
line voltage.
H-DF16 Downflow Filter Kit
Optional downflow filter kit may be added to any CHP16
unit not equipped with factory installed filter brackets. The
kit provides a means for filtering (downflow) return air in
side the cabinet.
DF16-41 DOWNFLOW FILTER KIT
SECURING
SCREW
RIGHT FILTER
BRACKET
BLOWER
FIGURE 54
FIGURE 55
I-Timed-Off Control Kit (Figure 56)
Optional field installed timed-off controls prevent the
CHA16 compressor from short cycling. After a thermostat
demand, automatic reset timed-off control keeps compres
sor off for 3-7 minutes.
Operation:
1- If the compressor has been de-energized for more
than 3-7 minutes, there will be a 3-10 second delay af
ter receiving a thermostat demand before the com
pressor can be energized.
2- After the compressor has been de-energized, the con
trol keeps the compressor off for 3-7 minutes.
3- If thermostat demand is present after 3-7 minutes,
compressor is immediately energized.
4- If there is no thermostat demand at the end of the 3-7
minute timed off period, the compressor remains deenergized until the next thermostat demand when all
safety circuits are closed.
Wiring:
1- Disconnect power to the unit.
2- Make wiring connections per figure 56.
J-OptionalCompressorMonitor(Figure57)
FILTER BRACKET
FILLER PIECE
(REMOVE FOR 2"
FILTER)
LEFT FILTER
BRACKET
SECURING
SCREW
FILTER BRACKET
FILLER PIECE
(REMOVE FOR 2" FILTER)
NOTE - Some electronic thermostats have built in time
delay. Field installed time delay is not needed.
G-Compressor Crankcase Heater
CHA16R and CHA16H (208/230v) only
SECURING
SCREW
(LEFT
SIDE)
SECURING SCREW
RIGHT FILTER
BRACKET
F-Condenser Coil Guard Kit
Optional condenser coil guard kit is available for all units.
The kit includes PVC coated steel wire coil guard which is
field installed. CHA16H units require one guard,
CHA16-411/413 and CHA16R-411 units require two
guards
and
CHA16-511/513/651/653
and
CHA16R-511/651 require three guards.
BLOWER
Optional compressor monitor can be installed in all units to
provide low ambient protection for the compressor. The
monitor (figure 57) is a N.O. temperature switch located in
the control box area. It is wired in series with the compres
sor contactor. When ambient temperature drops below
40°F, the switch opens and de-energizes the compressor
contactor thereby protecting the compressor from low am
bient operation.
Page 46
TIMED-OFF KIT (40G20)
TYPICAL FIELD WIRING OF 2-5 TON UNITS
CHA16(R) SINGLEPHASE SHOWN
other units similar
TimedOff
Control
1
3
2
FIGURE 56
Page 47
DENOTES FIELD
INSTALLED
OPTIONAL COMPONENTS
OPTIONAL COMPRESSOR MONITOR
TYPICAL FIELD WIRING OF 2-5 TON UNITS
CHA16(R) SINGLEPHASE SHOWN
other units similar
DENOTES FIELD
INSTALLED
OPTIONAL COMPONENTS
Compressor Monitor
(Low Ambient Lockout S3)
FIGURE 57
Page 48
K-Low Ambient Kit
The optional low ambient kit (figure 58) allows for mechani
cal cooling operation at low outdoor temperature.
The low ambient pressure switch is factory set to CUT-IN at
285psig with a difference of 146psig (CUT-OUT at
140psig). Adjustment should not be needed. If adjustment
is needed, adjust the switch as follows:
NOTE-Compressor monitor cannot be used with optional
low ambient kit. Optional field installed compressor moni
tor MUST be disconnected before allowing low ambient kit
to be used.
FIELD WIRING LOW AMBIENT KIT
COMPRESSOR
CONTACTOR
LOW AMBIENT
PRESSURE SWITCH
Low ambient kit field wiring is shown in figure 59. The low
ambient pressure switch is wired in series with the con
denser fan L1 lead. Refer to the low ambient kit installation
instruction manual for detailed installation instructions.
BLUE
BLUE
DISCONNECT
OPTIONAL
COMPRESSOR
MONITOR
COND
FAN
LOW AMBIENT KIT
TYPICAL INSTALLATION
LOW AMBIENT
PRESSURE SWTICH
COMP
HIGH PRESSURE
SWITCH
COMPRESSOR
COMPRESSOR
JUNCTION BOX
LOSS OF CHARGE
SWITCH
HIGH PRESSURE
SWITCH
DISCHARGE
LINE
SHOCK
LOOP
FIGURE 59
1- Loosen knob securing screw to allow knob stop to
pass over fixed stop on control (see figure 60).
LOSS OF
CHARGE
SWITCH
DIFFERENCE (set by knob) = CUT-IN POINT (fixed) mi
nus CUT-OUT POINT
2- Rotate the knob as needed to set the difference indica
tor at 145psig (1000kPa).
3- Tighten the securing screw after adjusting.
VALVE
DEPRESSOR TEE
To find CUT-OUT point, re-arrange the equation so that:
CUT-OUT = CUT-IN minus the DIFFERENCE.
FIGURE 58
The low ambient pressure switch cycles the condenser fan
while allowing normal compressor operation. This intermit
tent fan operation results in a high evaporating tempera
ture which allows the system to operate without icing the
evaporator coil and losing capacity.
LOW AMBIENT ADJUSTMENT
KNOB
SECURING
SCREW
ROTATE COUNTERCLOCKWISE
FIXED
STOP
Adjustment:
The low ambient pressure switch is adjustable but the ad
justment knob does not adjust CUT-IN or CUT-OUT points.
CUT-IN point is fixed and cannot be adjusted. The scale on
the switch measures the difference in pressure between
preset CUT-IN and adjustable CUT-OUT points. Adjust
ment knob changes CUT-OUT point by adjusting the DIF
FERENCE between CUT-IN and CUT-OUT.
Page 49
ADJUSTMENT
KNOB
SET INDICATOR
AT 140 PSIG
LOW AMBIENT
CONTROL
LOW AMBIENT ADJUSTMENT DETAIL
FIGURE 60
LOW AMBIENT KIT (LB44961)
TYPICAL FIELD WIRING OF 2-5 TON UNITS
CHA16H SINGLE-PHASE SHOWN
FIGURE 61
Page 50
90° WATER TIGHT
FLEXIBLE CONDUIT
TYPICAL ROOF CURB POWER ENTRANCE
DISCONNECT
BOX
WATER TIGHT
FLEXIBLE CONDUIT
STRAIGHT FLEXIBLE
CONDUIT FITTING
WATER TIGHT
FLEXIBLE CONDUIT
UNIT
90° WATER TIGHT
FLEXIBLE CONDUIT
CONDUIT
COUPLING
NIPPLE
(5" LENGTH)
L-Roof Curb Power Kit
MOUNTING
FRAME
UNIT
CONDUIT
COUPLING
CONDUIT 90° WATER TIGHT
COUPLING FLEXIBLE CONDUIT
WATERTIGHT
LOCKNUT
MOUNTING
FRAME
CONDUIT
COUPLING
WATER TIGHT
LOCKNUT
NIPPLE
(5" LENGTH)
FIGURE 62
NOTE - Status panels are not applicable to all CHA16
Optional Roof Curb Power kit allows line and low voltage
power to be brought into unit from RMF16 roof mounting
frame. Figure 62 shows typical installations. Roof Curb
Power kit is applicable only to larger (-410, -510 and -650)
unit sizes and can be used on both RMF16-41 and
RMF16-65 roof mounting frames. Two 7/8" knockouts are
provided along the long rails of each mounting frame. All
components in Roof Curb Power kit are field assembled
and field installed.
M-Transitions
Optional supply/return transitions (SRT16 AND SRTH16)
are available for use with downflow CHA16s utilizing the
optional RMF16 roof mounting frame. The transition must
be installed in the RMF16 mounting frame before mounting
the CHA16 to the frame. Refer to the manufacturer's in
structions included with the transition for detailed installa
tion procedures.
control systems. The following section details status
panel applications.
SP11 STATUS PANEL
Cool Mode
Heat Mode
Compressor 1
Compressor 2
No Heat
Filter
N-Supply and Return Diffusers
Optional flush mount diffuser/return FD9-65 and extended
mount diffuser/return RTD9-65 are available for use with
the CHA16. Refer to the manufacturer's instructions in
cluded with the transition for detailed installation proce
dures.
FIGURE 63
O-Status Panels SP11 and SSP11
P-SP11 Application -
Optional status panels allow remote monitoring of system
operation. Two types of panels are available. The SP11 (fig
ure 63) provides system readout only. The SSP11 switching
status panel (figure 64) is a combination switching subbase
and system readout. The SSP11 also has an After Hours
Timer" to override the unoccupied mode (night heating set
back / cooling setup).
Required Equipment: Readout Relay Kit
Page 51
Optional Equipment: Filter Switch Kit
The SP11 can be applied to all CHA16 control systems.
To operate an SP11, a readout relay kit is required to
interface the CHA16 to the SP11.
Q-SSP11 ApplicationRequired Equipment with Electrome
chanical Thermostat: Readout Relay Kit
2- The HEAT MODE" LED lights green during normal
heating operation.
Required Equipment with W973 Control:
Readout Relay Kit and SSP11 Relay Kit
Optional Equipment: Filter Switch Kit
3- The COMPRESSOR 1" LED lights green when the
compressor is running. The light turns red if a com
pressor safety switch opens during a compressor
demand (singlephase units must be equipped with
optional Controls Package for the red function of this
LED to operate).
4- The COMPRESSOR 2" LED is not used in CHA16
210 through 650 series units.
SSP11 SWITCHING STATUS PANEL
5- The NO HEAT" LED lights red on a loss of heat dur
ing a heating demand.
6- FILTER" LED lights red when filter pressure switch
contacts close indicating dirty filter.
Cool Mode
HEAT
Heat Mode
OFF
AUTO
SYSTEM
Compressor 1
AUTO
Compressor 2
ON
No Heat
7- The SYSTEM" switch on the SSP11 has five posi
tions to indicate the following functions:
OFF" - System off.
HEAT" - System operates in heating mode.
AUTO" - System automatically provides heating or
cooling on demand.
COOL" - System operates in cooling mode.
EM HEAT" - (Emergency Heat) Not used in CHA16
units, but if placed in this position, the unit operates
in the normal heating only mode.
COOL
EM HEAT
FAN
AFTER HOURS TIMER
Filter
START
FIGURE 64
The SSP11 can be applied to CHA16s using standard
electromechanical thermostat or Honeywell W973
control systems only. The Flexstat, Prostat, W7400
and T7300 control systems provide switching features
similar to the SSP11, therefore, the SSP11 is not need
ed. To operate an SSP11, a readout relay kit is required
to interface the CHA16 to the SSP11. An SSP11 relay
kit is also required in units using an electromechanical
thermostat.
Optional filter switch kit is required to make the
dirtyfilter light functional.
R-Indications and Functions
Both status panels are identical in function except for
switching and after hours capabilities of SSP11.
1- The COOL MODE" LED lights green to indicate
economizer free cooling" operation when unit in
cludes the economizer option. Otherwise, the LED
indicates mechanical cooling operation.
Page 52
8- The FAN" switch on the SSP11 has two positions to
indicate the following functions:
AUTO" - Blower cycles with demand.
ON" - Blower runs continuously.
9- The AFTER HOURS TIMER" on the SSP11 pro
vides override of unoccupied mode operation (night
heating setback / cooling setup) from 0 to 12 hours.
In the occupied (day) mode, the after hours timer
has no effect on unit operation.
The unit must be in the unoccupied mode (night) to
activate the timer. Set the potentiometer for the
number of hours desired override and push the mo
mentary start button. The unit reverts to occupied
mode operation for the set number of hours.
S-Installation and Wiring
The SP11 and SSP11 require relay kits to interface the
status panel to the control system and the unit. The fol
lowing sections list the operation sequence and instal
lation procedures for the relay kits and the status pan
els.
READOUT RELAY KIT (RRB) FIELD WIRING
DL6
1
1
2
CURRENT SENSING RELAY FIELD WIRING
Current Sensing Loop
C
3
4
3
NO
5
6
C
6
4
C
5
7
K29
8
9
K28
ECH16-185
Line Voltage L1
NC
10
EXISTING WIRING
FIELD WIRING
FIGURE 65
T-Readout Relay Kit
A readout relay kit (readout relay box - RRB) is re
quired for all units using either the SP11 or SSP11
status panels. RRB is shown in figure 66 and field
wiring (preparation of RRB for field wiring to status
panels) is shown in figure 65. The RRB includes re
lays which interface the status panels to the unit. The
status panels will not operate without the RRB.
READOUT RELAY BOX
RELAY K29
TERMINAL STRIP
TIME DELAY DL6
CONNECT FIELD WIRING
AS SHOWN IN FIGURE 65.
FIGURE 66
RRB Sequence of Operation:
1- Initial heating demand (W1) from the unit is routed
through RRB terminal 2 to SP11 terminal 2 to light
the green HEAT" light.
2- The same heat demand is routed through RRB
terminal 2 and through (RRB relay) K29 N.C. con
tacts to energize time delay DL6.
3- DL6 begins 60 second count before closing.
4- After current sensing relay K28 receives 24VAC
power, N.O. contacts close.
5- When current is sensed, N.O. contacts open.
Page 53
6- When K28 N.O. contacts open, time delay DL6 re
sets. When DL6 resets, the NO HEAT" light is
prevented from energizing.
7- If the current sensing relay does not sense cur
rent (indicating a problem with the electric heat or
the safety circuits) before time delay DL6 finishes
its 60 second count, time delay contacts close
and red NO HEAT" light is energized.
8- Other status panel lights are directly controlled by
the individual unit functions.
CHA16R Units:
The COMPRESSOR" light cannot be wired to
turn red. Each lead is connected to the low volt
age wire between the compressor contactor coil
and thermostat terminal Y1. The light will turn
green to indicate compressor operation during a
cooling demand.
CHA16 Units:
Each lead is connected electrically to either side
of the compressor's high pressure and loss of
charge switch. If the high pressure or loss of
charge switch should open, the green voltage
side of the COMPRESSOR" light would drop out
leaving only the red COMPRESSOR" light on.
1-Current Sensing Relay
A current sensing relay is connected to the RRB in
units equipped with electric heat. The current sens
ing relay momentarily closes its normally open con
tacts when power is applied to the relay coil (power is
applied to the coil when first stage thermostat de
mand is received by CHA16 terminal strip TB1). As
soon as current is sensed by the current sensing
relay, the normally open contacts reopen.
When the current sensing relay (normally open) con
tacts are closed, time delay DL6 is energized. DL6
begins a 30 second count before closing. When DL6
closes, the NO HEAT" light is energized.
Line voltage L1 passes through the current sensing
loop in the current sensing relay (figure 65). When
current is sensed with first stage heating demand
present, the current sensing relay's normally open
contacts reopen. When the contacts reopen, time
delay DL6 loses power and resets and the
NO HEAT" light is deenergized.
U-To wire an SP11 to a CHA16
1- Disconnect power to the unit.
2- Make electrical connections as shown in fig
ure 68, 69 and 70.
V-SSP11 Relay Kit
3- Relay K21 energizes when the SSP11 FAN"
switch is in the ON" position. Contacts K21-1
switch to allow the fan to run continuously.
SSP11 RELAY KIT INTERNAL WIRING
1 2
7 4 5
3
6
1
4
1
4
5
8
5
8
9
12
9
12
13
14
13
14
RELAY
K21
RELAY
K20
EXISTING WIRING
FIELD WIRING
FIGURE 67
An SSP11 relay kit (figure 67) is required on units us
ing an electromechanical thermostat and an SSP11
switching status panel. The kit is used with the RRB
(readout relay kit) to interface the SSP11 to the ther
mostat. The SSP11 relay kit must not be used on any
other control system.
SSP11 Relay Kit Sequence of Operation:
1-The SSP11 relay kit contains two relays which af
fect unit operation.
2- Relay K20 energizes when the SSP11 is switched
to EM HEAT." Contacts K20-1 open to de-acti
vate the green HEAT" light. Simultaneously, the
control switch routes power backward through
the HEAT" light. The HEAT" light changes to red.
Relay K20 has no other effect on unit operation.
Page 54
W-To wire an SSP11 to a CHA16
1- Disconnect power to the unit.
2- Make electrical connections as shown in figures
71 and 72.
X-Filter Switch Kit
An air filter switch kit is available for use with the SP11
and SSP11. The air filter switch is activated by high
negative pressure in the blower compartment caused
by dirty air filters or other restrictions. When high neg
ative pressure causes the switch to close, power is
routed from terminal strip terminal TB1-6 through the
switch to the red FILTER" light in the SP11 or SSP11.
See figure 73.
SP11 FIELD WIRING
ELECTROMECHANICAL OR
ELECTRONIC THERMOSTATS
ELECTROMECHANICAL OR
ELECTRONIC THERMOSTAT
TB1 TERMINAL
STRIP TB1
Y1
Y1
W1
G
G
4
RH
CONTACTORS
K1
5
6
RC
REMOVE FACTORY-INSTALLED
JUMPER WIRES FROM TB1 (4 TO
5, 8 TO 9, AND 14 TO 15) WHEN
USING WARM-UP KIT
L1
L2
L3
TI
T2
T3
7
8
Y2
10
W1
9
11
Y2
NOT ON ALL
THERMOSTATS
W2
Page 55
14
X
SP11 STATUS
PANEL
W2
15
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
READOUT
RELAY KIT AND
CURRENT SENSING
RELAY (Figure 65).
S27 OPTIONAL
FILTER SWITCH KIT
NO
C
1st STAGE
COMPRESSOR #1
OPTIONAL EQUIPMENT
24VAC FIELD INSTALLED
24V EXISTING WIRING
NOTE-All field wiring shown is in addition to thermostat and other
control wiring. Refer to unit and control wiring diagrams.
FIGURE 68
S24
S4
SP11 FIELD WIRING W973
CONTROL SYSTEM
OPTIONAL
REMOTE
SENSOR
RT2
T7067
THERMO
STAT
R
7
T
6
4
10
11
TB1 UNIT
TERMINAL
STRIP TB1
1
W1
2
H1
H2
Y1
G
3
4
5
R
Y
B
W
TR
TR
W973 Module 1
5
2
H3 C2
4
3
T1
T
C3
C1
CONTACTORS
5
K1
6
9
7
8
8
10
Page 56
DC WIRES MUST
BE RUN IN SEP
ARATE
SHIELDED
CABLE
REMOVE
FACTORYINSTALLED JUMPER WIRES
FROM TB1 (4 TO 5, 8 TO 9, AND
14 TO 15)
1
RT1
L2
L3
TI
T2
T3
9
11
Y2
14
L1
W2
15
1
2
3
4
5
6
7
8
9
10
SP11
STATUS
PANEL
12F83
1
2
3
4
5
6
7
8
9
10
NO
READOUT
RELAY KIT AND
CURRENT SENSING
RELAY (Figure 65).
C
CMC3-1
TIMER
S27 OPTION
AL
FILTER
SWITCH
KIT 97C85
OPTIONAL EQUIPMENT
24VAC FIELD INSTALLED
24V EXISTING WIRING
NOTE-All field wiring shown is in addition to thermostat and other
control wiring. Refer to unit and control wiring diagrams.
FIGURE 69
S24
S4
1st STAGE
COMPRESSOR #1
SP11 FIELD WIRING
W7400 CONTROL SYSTEM
OPTIONAL
REMOTE SEN
SOR
RT2
R
T
REMOVE FACTORY-INSTALLED
JUMPER WIRES ON TB1 (4 TO 5, 8
TO 9, AND 14 TO 15)
W1
TB1 UNIT
TERMI
NAL
STRIPY1
T7400
THERMO
STAT
1
Y1
W7400
CONTROL
MODULE
W2
W1
2
G
4
3
4
CONTACTORS
5
K1
6
7
8
DC WIRES MUST
BE RUN IN CABLE
SEPARATE FROM
AC WIRES
10
L1
L2
L3
TI
T2
T3
9
11
Y2
Page 57
W2
14
1
2
3
4
5
6
7
8
9
10
SP11
STATUS PANEL
12F83
1
2
3
4
5
6
7
8
9
10
NO
READOUT
RELAY KIT AND
CURRENT SENSING
RELAY (Figure 65).
C
15
S27 OPTIONAL
FILTER SWITCH
KIT 97C85
S24
OPTIONAL EQUIPMENT
24VAC FIELD INSTALLED
24V EXISTING WIRING
NOTE-All field wiring shown is in addition to thermostat and other
control wiring. Refer to unit and control wiring diagrams.
FIGURE 70
S4
1st STAGE
COMPRESSOR #1
OPTIONAL
REMOTE
SENSOR
RT2
SSP11 FIELD WIRING
W973 CONTROL SYSTEM
1
3
2
REMOVE THREE FACTORYINSTALLED JUMPER WIRES ON
TB1 (4 to 5, 8 to 9, and 14 to 15)
CMC3-1
CLOCK
R
7
1
T
6
2
4
3
5
8
H1
TB1 UNIT
TERMINAL
STRIP TB1
T7067
THERMOSTAT
H2
Y1
W1
G
4
CONTACTORS
5
K1
6
8
10
7
Y2
CAUTION: DC WIRES
MUST BE RUN IN CABLE
SEPARATE FROM AC
WIRES
Page 58
11
12
13
14
15
16
17
18
19
20
14
L1
L2
L3
TI
T2
T3
9
11
1
2
3
4
5
6
7
8
9
10
21
R
Y
B
C3 C1
W
TR
TR
W973 Module 1
5
2
H3 C2
4
3
T1
T
W2
15
1
2
3
4
5
6
7
8
9
10
NO
C
S27
OPTIONAL FIL
TER SWITCH KIT
1st STAGE
COMPRESSOR #1
READOUT
RELAY KIT SEE
FIGURE 66
DC WIRES MUST BE
RUN IN SEPARATE
CABLE
SSP11
SWITCHING STATUS
PANEL
OPTIONAL EQUIPMENT
24VAC FIELD INSTALLED
24V EXISTING WIRING
FIGURE 71
S24
S4
SSP11 FIELD WIRING ELECTROMECHANICAL
AND ELECTRONIC THERMOSTATS
ELECTROMECHANICAL OR
ELECTRONIC THERMOSTAT
TB1 TERMINAL
STRIP
Y1
Y1
DISCONNECT
FACTORY
INSTALLED
WIRE
G
RC
NO
C
G
4
S27 OPTIONAL
FILTER SWITCH KIT
X
K1
5
6
X TERMINAL
NOT ON ALL
THERMOSTATS
RH
REMOVE FACTORY-INSTALLED JUMPER
WIRES FROM TB1 (4 TO 5, 8 TO 9, AND 14 TO
15) WHEN USING WARM-UP KIT
CONTACTORS
W1
L1
L2
L3
TI
T2
T3
7
8
10
Y2
9
11
Y2
W2
14
15
W1
1
3
CMC3-1 TIME
CLOCK
Page 59
2
1
2
3
4
5
6
7
8
9
10
21
11
12
13
14
15
16
17
18
19
20
W2
READOUT RELAY
KIT
1
2
3
4
5
6
7
8
9
10
7
6
5
4
3
2
1
SSP11
RELAY
KIT
OPTIONAL EQUIPMENT
24VAC FIELD INSTALLED
24V EXISTING WIRING
SSP11 SWITCHING
STATUS PANEL
FIGURE 72
1st STAGE
COMPRESSOR #1
S24
S4
TYPICAL FILTER SWITCH INSTALLATION
LEAVE LOW SIDE OF SWITCH OPEN TO
ATMOSPHERE OF BLOWER COMPARTMENT
SECURE FILTER SWITCH
TO BLOWER HOUSING OR INSIDE MULLION
ATTACH HOSE TO HIGH SIDE OF SWITCH
GCS16 UNIT
BLOWER HOUSING
HORIZONTAL SUPPLY AND RETURN AIR COVERS
FIELD SUPPLIED AIR FILTER
MOUNTED IN RETURN AIR DUCT
SUPPLY AIR
RETURN AIR
FIGURE 73
P age 60
ROUTE HOSE THROUGH DUCT TO OPPOSITE
SIDE OF FILTER
XI-FIELD WIRING
CHA16H-261/311 WITH ECH16-1P SERIES ELECTRIC HEAT PACKAGE SINGLE DISCONNECT
SWITCH APPLICATION
(ECH16-15-1P SHOWN)
POWER
SUPPLY
WIRES
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
ELECTRIC ELEMENT/
CONTROL BOX JACK
(J2)
ELECTRIC ELEMENT/
CONTROL BOX
ASSEMBLY
RACEWAY
ECH16-P FUSE
BOX ASSEMBLY
LOW
VOLTAGE
PIGTAILS
FUSE
HOLDER
CONTACTOR
(K1)
COMPRESSOR
COMPARTMENT
LOAD
WIRES
POWER
WIRES
POWER SUPPLY WIRES
(connect to center terminals)
FIGURE 74
CHA16(R)-411, -511, -651 AND CHA16-261, -311, -411, -511, -651
WITH ECH16-1P SERIES ELECTRIC HEAT PACKAGE-SINGLE DISCONNECT SWITCH APPLICATION
(ECH16-15-1P SHOWN)
ELECTRIC ELEMENT/
CONTROL BOX ASSEMBLY
ELECTRIC ELEMENT/
CONTROL BOX JACK
(J2)
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
ECH16
FUSE BOX
ASSEMBLY
LOW VOLTAGE
FIELD WIRING
MAKE-UP AREA
CONTACTOR
(K1)
LOAD
WIRES
FUSE HOLDER
COMPRESSOR
COMPARTMENT
POWER SUPPLY
WIRES
LOAD WIRES
POWER WIRES
FIGURE 75
Page 61
POWER SUPPLY WIRES
(connect to center terminals)
CHA16-413, -513, -653 WITH ECH16-Y, -G, -J SERIES ELECTRIC HEAT PACKAGE
SINGLE DISCONNECT SWITCH APPLICATION
(ECH16-20/25-1Y SHOWN)
ELECTRIC ELEMENT/
CONTROL BOX AS
SEMBLY
ELECTRIC ELEMENT/
CONTROL BOX JACK
(J2)
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
ECH16
FUSE BOX
ASSEMBLY
LOW VOLTAGE
FIELD WIRING
MAKE-UP AREA
LOAD
WIRES
CONTACTOR
(K1)
FUSE HOLDER
COMPRESSOR
COMPARTMENT
POWER SUPPLY
WIRES
LOAD WIRES
POWER WIRES
FIGURE 76
FIGURE 77
Page 62
POWER SUPPLY WIRES
(connect to center terminals)
CHA16H-261/311 WITH ECH16-1P SERIES ELECTRIC HEAT PACKAGE
MULTIPLE DISCONNECT SWITCH APPLICATION
(ECH16-15-1P SHOWN)
POWER SUPPLY WIRES FROM
TWO DISCONNECT SWITCHES
ELECTRIC ELEMENT/CONTROL
BOX JACK (J2)
ELECTRIC ELEMENT/
CONTROL BOX ASSEMBLY
RACEWAY
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
LOW
VOLTAGE
PIGTAILS
FUSE
HOLDER
CONTACTOR
(K1)
COMPRESSOR
COMPARTMENT
POWER
SUPPLY
WIRES
POWER SUPPLY WIRES
FIGURE 78
CHA16(R)-411, -511, -651 AND CHA16-261, -311, -411, -511, -651
WITH ECH16-1P SERIES ELECTRIC HEAT PACKAGE-MULTIPLE DISCONNECT SWITCH APPLICATION
(ECH16-15-1P SHOWN)
ELECTRIC ELEMENT/
CONTROL BOX ASSEMBLY
ELECTRIC ELEMENT/
CONTROL BOX JACK
(J2)
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
LOW VOLTAGE
FIELD WIRING
MAKE-UP AREA
FUSE HOLDER
CONTACTOR
(K1)
POWER SUPPLY
WIRES FROM TWO
DISCONNECT
SWITCHES
POWER SUPPLY
WIRES
FIGURE 79
Page 63
COMPRESSOR
COMPARTMENT
CHA16-413, -513, -653 WITH ECH16-Y, -G, -J SERIES ELECTRIC HEAT PACKAGE
MULTIPLE DISCONNECT SWITCH APPLICATION
(ECH16-20/25-1Y SHOWN)
ELECTRIC ELEMENT/
CONTROL BOX ASSEMBLY
ELECTRIC ELEMENT/
CONTROL BOX JACK
(J2)
LOW VOLTAGE
FIELD WIRING
MAKE-UP AREA
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
CONTACTOR
(K1)
POWER SUPPLY
WIRES FROM TWO
DISCONNECT
SWITCHES
FUSE HOLDER
POWER SUPPLY
WIRES
FIGURE 80
FIGURE 81
Page 64
COMPRESSOR
COMPARTMENT
POWER SUPPLY
WIRES
CHA16H-261/311 WITH ECH16R-1P SERIES ELECTRIC HEAT PACKAGE
SINGLE DISCONNECT SWITCH APPLICATION
(ECH16R-10-1P SHOWN)
ELECTRIC ELEMENT
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
ELECTRIC ELEMENT
JACK (J2)
ECH16 FUSE
BOX ASSEMBLY
FOR
CHA16H/CHP16H
UNIT
RACEWAY
LOW
VOLTAGE
PIGTAILS
PIGTAILS
ASSEMBLY
ECH16R FUSE BOX
ASSEMBLY FOR
ELECTRIC HEAT
CONTACTOR
(K1)
COMPRESSOR
COMPARTMENT
LOAD
WIRES
POWER
WIRES
POWER SUPPLY WIRES
(connect to center terminals)
FIGURE 82
CHA16(R)-411, -511, -651 AND CHA16-261, -311, -411, -511, -651
WITH ECH16R-1P SERIES ELECTRIC HEAT PACKAGE-SINGLE DISCONNECT SWITCH APPLICATION
(ECH16R-10-1P SHOWN)
ELECTRIC ELEMENT/
JACK (J2)
PIGTAILS
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
ECH16 FUSE BOX
ASSEMBLY FOR
CHA16/CHP16 UNIT
LOW VOLTAGE
FIELD WIRING
MAKE-UP AREA
LOAD
WIRES
ELECTRIC ELEMENT
ASSEMBLY
ECH16R FUSE
BOX ASSEMBLY
FOR ELECTRIC
HEAT
CONTACTOR
(K1)
COMPRESSOR
COMPARTMENT
POWER SUPPLY
WIRES
LOAD WIRES
POWER SUPPLY WIRES
(connect to center terminals)
POWER WIRES
FIGURE 83
Page 65
FIGURE 84
CHA16H-261/311 WITH ECH16R-1P SERIES ELECTRIC HEAT PACKAGE
MULTIPLE DISCONNECT SWITCH APPLICATION
(ECH16R-10-1P SHOWN)
ELECTRIC ELEMENT
POWER SUPPLY WIRES TO (2)
DISCONNECT SWITCHES
ELECTRIC ELEMENT
JACK (J2)
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
ASSEMBLY
RACEWAY
CONTACTOR
(K1)
LOW
VOLTAGE
PIGTAILS
WIRE
NUTS
POWER
SUPPLY
WIRES
COMPRESSOR
COMPARTMENT
POWER SUPPLY WIRES
FIGURE 85
Page 66
CHA16(R)-411, -511, -651 AND CHA16-261, -311, -411, -511, -651
WITH ECH16R-1P ELECTRIC HEAT PACKAGE-MULTIPLE DISCONNECT SWITCH
(ECH16-10-1P SHOWN)
ELECTRIC ELEMENT/
CONTROL BOX JACK
(J2)
UNIT 24 VOLT HARNESS
ASSEMBLY PLUG (P2)
ELECTRIC ELEMENT
ASSEMBLY
LOW VOLTAGE
FIELD WIRING
MAKE-UP AREA
POWER SUPPLY
WIRES TO TWO
DISCONNECT
SWITCHES
CONTACTOR
(K1)
POWER SUPPLY
WIRES
WIRE
NUTS
COMPRESSOR
COMPARTMENT
FIGURE 86
FIGURE 87
Page 67
6
2
Page 68
1
3
5
4
3
residential CHA16H or CHA16R with basic thermostat
XII–WIRING DIAGRAMS AND OPERATION SEQUENCE
C24 diagram with B30 diagram
B30 DIAGRAM AND C24 DIAGRAM
CHA16H or CHA16R Residential SinglePhase Unit
XII-OPERATION SEQUENCE
The flowcharts in this section show the step by step sequence that takes place when thermo
stat demand is received by the CHA16. The sequence describes the actions of devices in the
unit which control blowers, fans gas valves and other components in the system. The se
quence is outlined by numbered steps which correspond to circled numbers on the adjacent
diagram.
The following is an explanation of Lennox' model number designations:
CHA16R: Residential unit without crankcase heater, high pressure switch, loss of
charge switch and low voltage terminal strip.
CHA16H: Same as CHA16R except in horizontal only (nonconvertible) cabinet.
Page 69
CHA16: Commercial unit with crankcase heater, high pressure switch, loss of
charge switch and low voltage terminal strip.
CHA16R and CHA16H units are designed for residential use only and are not equipped with
the necessary hardware for connecting optional control systems or economizer. The C24
thermostat section is a straightforward residential thermostat designed for the CHA16R and
CHA16H exclusively. The thermostat used may be electromechanical or electronic.
NOTE This is a basic operation sequence for a singlephase CHA16. The sequence
shows a singlephase CHA16R or CHA16H connected to a C24" thermostat control sec
tion.
A-CHA16H SinglePhase Unit
Basic residential CHA16H is a singlestage heat, singlestage cool unit.
Sequence of Operation:
1- Line voltage energizes transformer T1. Transformer T1 provides 24VAC power to all unit
controls and thermostat.
2- Cooling demand energizes Y1 and G in the thermostat. Y1 energizes compressor contactor
K1. G energizes relay K3.
3- K1 is a singlepole contactor which allows compressor terminal R and one leg of the con
denser fan powered at all times. K11 closes to energize the compressor and the condenser
fan. The condenser fan begins operating.
4- K32 switches to energize the blower on high speed. K31 switches to power the economizer
(if equipped). Dampers open to minimum position.
Heating:
5- In heating mode relay contacts K31 and K32 are in their normally closed (N.C.) position.
The circuit from K31 to P25, through the electric heat unit, and returning through P27 and
K32 to the blower motor allows the electric heat unit to control blower operation in the heat
ing mode.The blower is typically energized by a set of electric heat contacts in the ECH16.
6- Heating demand initiates at W1 in the thermostat and passes through directly to the ECH16
electric heat (if installed). The indoor blower is energized when ECH16 thermal relay con
nected to P27 closes.
Alternate for Units Equipped with Start Components:
3- As the compressor gains speed, compressor terminal S is powered by start capacitor C7.
When the compressor nears full speed potential relay K31 is energized and the start capaci
tor is taken out of the circuit. K31 remains energized during compressor operation. Run side
of dual capacitor C12 (and run capacitor C5, if so equipped) remains in the circuit between
terminals R and S during all compressor operation to optimize motor efficiency.
C19 diagram with B30 diagram and D8 diagram
special limited commercial application of residential CHA16H
with basic thermostat, downturn transition and threeposition economizer
6
1
Page 70
2
3
4
5
3
B30 DIAGRAM WITH C19 DIAGRAM AND D8 DIAGRAM
Limited Commercial Application of
CHA16H Residential SinglePhase Unit Connected To RDE16 and ThreePosition Economizer
with Basic Electromechanical or Electronic Thermostat
B-C19 DIAGRAM and B30 DIAGRAM with D8 DIAGRAM (commercial application of
electromechanical or electronic thermostat wired to a residential unit with three
position economizer).
CHA16H units, even though not equipped for commercial use, may be converted to commer
cial downflow use in a special limited application. This application requires the use of
RDE1631 roof duct enclosure to convert the unit to downflow use. The RDE1631 includes
a factory installed harness for connecting optional REMD1631 or REMD16M31.
Basic residential CHA16H is a singlestage heat, singlestage cool unit.
Sequence of Operation:
1- Line voltage energizes transformer T1. Transformer T1 provides 24VAC power to all unit
controls and thermostat.
2- Cooling demand energizes Y1 and G in the thermostat. Y1 energizes compressor contactor
K1. G energizes relay K3.
3- K1 is a singlepole contactor which allows compressor terminal R and one leg of the con
denser fan powered at all times. K11 closes to energize the compressor and the condenser
fan. The condenser fan begins operating.
4- K32 switches to energize the blower on high speed. K31 switches to power the economizer
(if equipped). Dampers open to minimum position.
Heating:
5- In heating mode relay contacts K31 and K32 are in their normally closed (N.C.) position.
The circuit from K31 to P25, through the electric heat unit, and returning through P27 and
K32 to the blower motor allows the electric heat unit to control blower operation in the heat
ing mode. The blower is typically energized by a set of electric heat contacts in the ECH16.
6- Heating demand initiates at W1 in the thermostat and passes through directly to the ECH16
electric heat (if installed). The indoor blower is energized when ECH16 thermal relay con
nected to P27 closes.
Alternate for Units Equipped with Start Components:
3- As the compressor gains speed, compressor terminal S is powered by start capacitor C7.
When the compressor nears full speed potential relay K31 is energized and the start capaci
tor is taken out of the circuit. K31 remains energized during compressor operation. Run side
of dual capacitor C12 (and run capacitor C5, if so equipped) remains in the circuit between
terminals R and S during all compressor operation to optimize motor efficiency.
Page 71
C19 diagram with B30 diagram and D5 diagram
special limited commercial application of residential CHA16H
with basic thermostat, downturn transition and modulating economizer
8
4
2
9
13 16
6
15
10
5
Page 72
11
12
1
3
18
17
14
7
B30 DIAGRAM WITH C19 DIAGRAM AND D5 DIAGRAM
Limited Commercial Application of
CHA16H Residential SinglePhase Unit Connected To RDE16 and Modulating Economizer
with Basic Electromechanical or Electronic Thermostat
Page 73
C-C19 DIAGRAM and B30 DIAGRAM with D5 DIAGRAM (commercial application of
electromechanical or electronic thermostat wired to a residential unit with modu
lating economizer).
CHA16H units, even though not equipped for commercial use, may be converted to commer
cial downflow use in a special limited application. The application requires use of RDE16 roof
duct enclosure to convert the unit to downflow use. The RDE16-31 includes a factory
installed harness for connecting optional REMD16M-41 or REMD16-41 economizer.
NOTE - The RDE16 economizer harness is represented in diagram C19. The economizer
harness and jack J3 are located inside the RDE16, not inside the unit as in other CHA16
commercial units. REMEMBER, this is a limited application converting a residential unit to
commercial use.
The harness (shown in diagram C19) has pigtails on the unit end and harness jack J3 on the
economizer end. The unit end of the harness hard wires to the unit and thermostat with pig
tails. Economizer jack J3 at the economizer end of the harness connects directly into econo
mizer plug P4. Field wiring is shown in more detail in figure 52.
This particular application connects the REMD16M modulating economizer to the CHA16H.
The RDE16 return air side panel is removed and the REMD16M slides into the side of the
cabinet (exactly as it would into the side of a commercial CHA16). Economizer harness jack
is located in the return air compartment of the RDE16. This installation is shown in figures 50
and 51 .
Operation Sequence:
1- Line voltage energizes transformer T1. Transformer T1 provides 24VAC power to all unit
controls and thermostat.
2- Heating demand initiates at W1 in the thermostat and energizes electric heat if installed.
3- Indoor blower B3 is energized on heating speed through normally closed relay K32 when
thermal heat relay in the ECH16 closes.
4- Economizer outdoor air dampers are held closed by relay K32 (no minimum outdoor air ex
change).
Cooling:
I. Enthalpy Control in Low Position (outside air can be used for cooling).
1st stage cool (all models):
5- Cooling demand energizes thermostat terminals Y1 and G.
6- Blower demand from terminal G energizes blower relay K3.
7- Relay contacts K31 switch to allow economizer dampers to operate.
Contacts K32 switch to energize indoor blower B3 on cooliing speed.
8- Cooling demand Y1 is sent to enthalpy control A6 terminal 1.
9- Enthalpy control A6 has determined that outside air can be used for cooling and has
switched relay 1K and 2K internally.
10- Cooling demand is routed through enthalpy control to energize internal relay 1S. Internal
contacts 1S1 close to complete a circuit through damper motor terminals T and T1.
11- When a voltage is applied across terminals T and T1 of damper motor, the damper motor is
energized and outdoor dampers open. Supply air sensor R1 varies the voltage across T and
T1 and the outdoor air dampers adjust accordingly. First stage cooling is provided by outdoor
air.
2nd stage cool (all models):
12- Economizer outdoor air dampers remain open.
13- Additional cooling demand is routed from thermostat Y2 through enthalpy control terminals 3
and 5 to energize K1. The compressor provides all additional cooling.
14- K1 is a single pole contactor, allowing compressor terminal R and one leg of the condenser
fan to be powered at all times. K1-1 closes to energize compressor terminal C, condenser
fan motor and the run capacitors for each motor. Condenser fan and compressor immedi
ately begin operating.
II. Enthalpy Control in High Position (outside air cannot be used for cooling).
15- Enthalpy control internal relays 1K and 2K switch. Internal relay 1S is de-energized and 1S1
opens. Outdoor air dampers close to minimum position.
16- Cooling demand is sent from thermostat terminal Y1 through enthalpy control terminals 1
and 2 and through enthalpy control terminal 5 to energize the compressor. The compressor
handles all cooling.
17- K1 is a single pole contactor, allowing compressor terminal R and one leg of the condenser
fan to be powered at all times. K1-1 closes to energize compressor terminal C, condenser
fan motor and the run capacitors for each motor. Condenser fan and compressor immedi
ately begin operating.
18- Thermostat terminal G energizes relay K3. K3-1 closes to energize the indoor blower on
cooling speed and K3-2 closes to energize the damper motor. Outdoor dampers open to
minimum position.
Night Setback (optional field installed-not shown)
19- Optional field installed time-clock (not shown), night thermostat S12 (not shown) and Night
Relay Kit K11 must be connected for night setback operation (night setback relay K11 not
factory equipped in modulating economizer). See figure 52.
20- Blower B3 operates only during a heating demand when night thermostat is closed.
21- When clock contacts close (not shown), relay K11 energizes. Contacts K11-1 open to dis
able the day thermostat and contacts K11-2 open to drive the dampers full closed.
22- (Not Shown) Night thermostat S12 is typically set with setpoints below thermostat S1. Dur
ing unoccupied periods, K11-1 opens while S1 is disabled. When S12 closes, power is sup
plied to S1 and the unit operates normally. When S12's setpoint is reached, S12 opens, S1 is
disabled and unit operation stops.
23- Shortly before the building is to be occupied, clock contacts open to de-energize relay K11.
Contacts K11-1 close to restore power the thermostat S1 and Contacts K11-2 close to re
store power to the minimum positioner. Outdoor air dampers open to minimum position dur
ing blower operation.
C1 diagram with B30 diagram
6
2
Page 74
1
3
5
4
3
commercial singlephase CHA16 with basic thermostat
C1 DIAGRAM AND B30 DIAGRAM
Single-Phase Commercial CHA16 without Economizer
Connected to Electromechanical Thermostat
D-COMMERCIAL THERMOSTAT SYSTEMS
Commercial units (CHA16) are factory equipped with crankcase heater, high pressure
switch, loss of charge switch and low voltage terminal strip. Units are also equipped with
commercial controls wiring harness and jackplugs for connecting Lennox commercial con
trols and thermostats.
1- C1 SECTION and B30 SECTION (electromechanical thermostat wired to single
phase commercial unit)
The C1 thermostat section is a straight-forward electromechanical thermostat design for the
commercial CHA16. CHA16R and CHA16H units are designed for residential use only and
are not equipped with the necessary hardware for connecting optional control systems or
economizer.
511 and 651 units are factory equipped with hard start components (start capacitor and po
tential relay). 261, 311 and 411 units are not. All units except for 411s use separate compres
sor and fan run capacitors. 411s use a single dual" capacitor for both the compressor and
condenser fan motors. 651 units use two compressor run capacitors connected in parallel.
NOTE-This is a basic operation sequence for a single-phase CHA16. The sequence shows
a single-phase commercial CHA16 connected to a C1" thermostat control section.
Sequence of Operation:
1- Line voltage energizes transformer T1. Transformer T1 provides 24VAC power to all unit
controls and thermostat.
2- Cooling demand energizes Y1 and G in the thermostat. Y1 energizes compressor contactor
K1. G energizes relay K3.
3- K1 is a singlepole contactor which allows compressor terminal R and one leg of the con
denser fan powered at all times. K11 closes to energize the compressor and the condenser
fan. The condenser fan begins operating.
4- K32 switches to energize the blower on high speed. K31 switches to power the economiz
er (if equipped). Dampers open to minimum position.
Heating:
5- In heating mode relay contacts K31 and K32 are in their normally closed (N.C.) position.
The circuit from K31 to P25, through the electric heat unit, and returning through P27 and
K32 to the blower motor allows the electric heat unit to control blower operation in the heat
ing mode. The blower is typically energized by a set of electric heat contacts in the ECH16.
6- Heating demand initiates at W1 in the thermostat and passes through directly to the ECH16
electric heat (if installed). The indoor blower is energized when ECH16 thermal relay con
nected to P27 closes.
Alternate for Units Equipped with Start Components:
3- As the compressor gains speed, compressor terminal S is powered by start capacitor C7.
When the compressor nears full speed potential relay K31 is energized and the start capaci
tor is taken out of the circuit. K31 remains energized during compressor operation. Run side
of dual capacitor C12 (and run capacitor C5, if so equipped) remains in the circuit between
terminals R and S during all compressor operation to optimize motor efficiency.
Page 75
C1 diagram with B31 diagram
7
2
3
Page 76
6
5
1
4
208/230V-3ph. commercial unit without economizer
connected to electromechanical thermostat
C1 DIAGRAM AND B31 DIAGRAM
Three-Phase Commercial CHA16 without Economizer
Connected to Electromechanical Thermostat
2- C1 SECTION and B31 SECTION (electromechanical thermostat wired to 208/230V
threephase commercial unit)
Sequence of Operation:
1- Compressor crankcase heater is selfregulating and is powered at all times by line voltage.
2- Line voltage energizes transformer T1. Transformer T1 provides 24VAC power to all unit
controls and thermostat.
3- Cooling demand energizes Y1 and G in the thermostat. Y1 passes through pressure
switches S4 and S24 to energize compressor contactor K1. G energizes relay K3.
4- K11 closes to energize the compressor and condenser fan. Both immediately begin operat
ing.
5- K32 switches to energize the blower on high speed. K31 switches to power the economizer
(if equipped). Dampers open to minimum position.
Heating:
6- In heating mode relay contacts K31 and K32 are in their normally closed (N.C.) position.
The circuit from K31 to P25, through the electric heat unit, and returning through P27 and
K32 to the blower motor allows the electric heat unit to control blower operation in the heat
ing mode. The blower is typically energized by a set of electric heat contacts in the ECH16.
7- Heating demand initiates at W1 in the thermostat and passes through directly to the ECH16
electric heat (if installed). The indoor blower is energized when ECH16 thermal relay con
nected to P27 closes.
Page 77
C1 diagram with B32 diagram
8
2
4
Page 78
3
7
6
5
1
460V and 575V commercial units without economizer
connected to electromechanical thermostat
C1 DIAGRAM AND B32 DIAGRAM
Three-Phase Commercial CHA16 without Economizer
Connected to Electromechanical Thermostat
3- C1 SECTION and B32 SECTION (electromechanical thermostat wired to 460V or
575V threephase commercial unit)
Sequence of Operation:
1- Compressor crankcase heater is selfregulating and is powered at all times by line voltage.
2- Line voltage energizes transformers T1. Transformer T1 provides 24VAC power to all unit
controls and thermostat.
3- Transformer T4 is used in 575V units only. T4 provides 460VAC to indoor blower B3. Re
duced voltage is provided to the common leg of the blower. It is powered at all times.
4- Cooling demand energizes Y1 and G in the thermostat. Y1 passes through pressure
switches S4 and S24 to energize compressor contactor K1. G energizes relay K3.
5- K11 closes to energize the compressor and condenser fan. Both immediately begin operat
ing.
6- K32 switches to energize the blower on high speed. K31 switches to power the economiz
er (if equipped). Dampers open to minimum position.
Heating:
7- In heating mode relay contacts K31 and K32 are in their normally closed (N.C.) position.
The circuit from K31 to P25, through the electric heat unit, and returning through P27 and
K32 to the blower motor allows the electric heat unit to control blower operation in the heat
ing mode. The blower is typically energized by a set of electric heat contacts in the ECH16.
8- Heating demand initiates at W1 in the thermostat and passes through directly to the ECH16
electric heat (if installed). The indoor blower is energized when ECH16 thermal relay con
nected to P27 closes.
Page 79
C1diagram with D8 diagram
electromechanical thermostat with threeposition economizer
5
4
11
6
10
11
7
Page 80
3
1
2
8
9
Thermostat Footnotes
Economizer Footnotes
C1 DIAGRAM WITH D8 DIAGRAM
Electromechanical Thermostat with ThreePosition Economizer
Page 81
4-C1 Section with D8 Section - Basic (threeposition) Economizer Operation
When an REMD16 or EMDH16 Economizer section is applied to the CHA16 with electrome
chanical thermostat, two stages of cooling are available dependent on the actions of the en
thalpy control inside the economizer. By sensing outside temperature and relative humidity,
the enthalpy control determines if outside air can be used as a first stage of cooling. If so, 1st
stage cooling is handled by outdoor air dampers and 2nd stage cooling is handled by the
compressor. When outdoor air conditions become unsatisfactory for cooling, the outdoor air
dampers close and the compressor handles all cooling demand.
NOTE - In order to understand how optional controls affect operation of the CHA16, you
must first read and understand how all the CHA16 components work.
Factory jumper-plug P3 is removed from unit harness jack J3 and discarded. Economizer
plug P4 replaces plug P3. These connections are made in the unit blower compartment.
Operation Sequence:
NOTE - In this operation sequence the unit diagram has been omitted in order to concen
trate on the interaction between thermostat and controls.
1- Economizer outdoor air dampers drive full closed anytime blower B3 is not operating.
2- Enthalpy control A6 terminal X and damper motor terminal X are powered by unit relay K3
when there is a blower demand or by K13 when there is a heating demand . When 24VAC is
applied between terminals TR and X, the damper motor is energized and the outdoor damp
ers open to mid (minimum) position.
3- Economizer jack J28 is not used in this application and should remain disconnected.
4- Blower B3 is energized by thermostat terminal G. On a cooling demand, thermostat terminal
G energizes relay K3 (not shown) which in turn energizes the blower. When K3 energizes,
K3-1 closes to energize the blower and K3-2 closes to energize the economizer and open
the outdoor air dampers to mid (minimum) position.
I. Enthalpy Control in Low Position (outside air can be used for cooling).
1st stage cool (all models):
5- Initial cooling demand Y1 is sent to enthalpy control A6 terminal 1.
6- Enthalpy control A6 has determined that outside air can be used for cooling and has
switched internal 1K and 2K internally.
7- Cooling demand is routed through enthalpy control terminal 6 and through discharge air
thermostat S13 to enthalpy control terminal D and damper motor terminal D.
8- When 24VAC is applied across terminals D and T of damper motor, the damper motor ener
gizes and outdoor dampers open fully. First stage cooling is provided by outdoor air.
2nd stage cool (all models):
9- Economizer outdoor air dampers remain open.
10- Additional cooling demand is routed from thermostat Y2 through enthalpy control terminals 3
and 5 to energize the compressor. The compressor provides all additional cooling demand.
II. Enthalpy Control in High Position (outside air cannot be used for cooling).
Cooling:
11- Cooling demand is sent from thermostat terminal Y1 through enthalpy control terminals 1
and 2 and through enthalpy control terminal 5 to energize the compressor. The compressor
handles all cooling.
Night Setback (optional field installed - not shown)
12- Optional field installed time clock, night thermostat S12 (not shown) and Night Relay K11
(figure 52) must be connected for night setback operation.
13- Blower B3 operates only during a heating demand when night thermostat is closed.
14- When clock contacts close, relay K11 energizes. Contacts K11-1 open to disable the day
thermostat and contacts K11-2 open to drive the dampers full closed.
15- Night thermostat S12 is typically set with setpoints below thermostat S1. During unoccupied
periods, K11-1 opens while S1 is disabled. When S12 closes, power is supplied to S1 and
the unit operates normally. When S12's setpoint is reached, S12 opens, S1 is disabled and
unit operation stops.
16- Shortly before the building is to be occupied, clock contacts open to de-energize relay K11.
Contacts K11-1 close to restore power the thermostat S1 and Contacts K11-2 close to re
store power to the minimum positioner. Outdoor air dampers open to mid (minimum) position
during blower operation.
C1 diagram with D5 diagram
electromechanical thermostat with modulating economizer
24V POWER
12
15
3
12 14
ECONOMIZER
1
BLOWER
HEAT 1
11
13
4
HEAT 2
COOL 2
5
10
2
9
8
COOL 1
11
6
Page 82
14
12 16
12
24V COMMON
7
14
Economizer Footnotes
Thermostat Footnotes
C1 DIAGRAM with D5 DIAGRAM
Electromechanical Thermostat with Modulating Economizer
Page 83
5-C1 Section with D5 Section - Basic (modulating) Economizer Operation
When an REMD16M or EMDH16M Economizer section is applied to the CHA16 with electro
mechanical thermostat, two stages of cooling are available dependent on the actions of the
enthalpy control inside the economizer. By sensing outside temperature and relative humid
ity, the enthalpy control determines if outside air can be used as a first stage of cooling. If so,
1st stage cooling is handled by outdoor air dampers and 2nd stage cooling is handled by the
compressor. The enthalpy control continuously adjusts the outdoor air dampers to maintain
a balanced mixed air temperature. When outdoor air conditions become unsatisfactory for
cooling, the outdoor air dampers close and the compressor handles all cooling demand.
NOTE - In order to understand how optional controls affect operation of the CHA16, you
must first read and understand how all the CHA16 components work.
Factory jumper-plug P3 is removed from unit harness jack J3 and discarded. Economizer
plug P4 replaces plug P3. These connections are made in the unit blower compartment.
Operation Sequence:
NOTE - In this operation sequence the unit diagram has been omitted in order to concen
trate on the interaction between thermostat and controls.
1- Economizer outdoor air dampers drive full closed anytime blower B3 is not operating.
2- Damper motor terminal TR is powered by unit relay K3 when there is a blower demand or by
K13 when there is a heating demand. When 24VAC is applied between terminals TR and
TR1, the damper motor is energized and the outdoor dampers open to minimum position.
3- Blower B3 is energized by thermostat terminal G. On a cooling demand, thermostat terminal
G energizes relay K3 which in turn energizes the blower. When K3 energizes, K3-1 closes to
energize the blower and K3-2 closes to energize the economizer (see step 2) and open the
outdoor air dampers to minimum position.
I. Enthalpy Control in Low Position (outside air can be used for cooling).
1st stage cool (all models):
4- Initial cooling demand Y1 is sent to enthalpy control A6 terminal 1.
5- Enthalpy control A6 has determined that outside air can be used for cooling and has
switched internal 1K and 2K internally.
6- Cooling demand is routed through enthalpy control to energize internal relay 1S. Internal
contacts 1S1 close to complete a circuit through damper motor terminals T and T1.
7- When a voltage is applied across terminals T and T1 of damper motor, the damper motor
energizes and outdoor dampers open. Supply air sensor R1 varies the voltage across T and
T1 and the outdoor air dampers adjust accordingly. First stage cooling is provided by outdoor
air.
2nd stage cool (all models):
8- Economizer outdoor air dampers remain open.
9- Additional cooling demand is routed from thermostat Y2 through enthalpy control terminals 3
and 5 to energize the compressor. The compressor provides all additional cooling.
II. Enthalpy Control in High Position (outside air cannot be used for cooling).
Cooling:
10- Enthalpy control internal relays 1K and 2K switch. Internal relay 1S is de-energized and 1S1
opens. Outdoor air dampers close to minimum position.
11- Cooling demand is sent from thermostat terminal Y1 through enthalpy control terminals 1
and 2 and through enthalpy control terminal 5 to energize the compressor. The compressor
handles all cooling.
Night Setback (optional field installed)
12- Optional field installed time clock, night thermostat S12 and Night Relay K11 must be con
nected for night setback operation (night setback relay K11 not factory equipped in modulat
ing economizer - it must be field installed for night setback).
13- Blower B3 operates only during a heating demand when night thermostat is closed.
14- When clock contacts close, relay K11 energizes. Contacts K11-1 open to disable the day
thermostat and contacts K11-2 open to drive the dampers full closed.
15- Night thermostat S12 is typically set with setpoints below thermostat S1. During unoccupied
periods, K11-1 opens while S1 is disabled. When S12 closes, power is supplied to S1 and
the unit operates normally. When S12's setpoint is reached, S12 opens, S1 is disabled and
unit operation stops.
16- Shortly before the building is to be occupied, clock contacts open to de-energize relay K11.
Contacts K11-1 close to restore power the thermostat S1 and Contacts K11-2 close to re
store power to the minimum positioner. Outdoor air dampers open to minimum position dur
ing blower operation.
C2-1 diagram with D8 diagram
electromechanical thermostat with threeposition economizer and warm-up
24V POWER
8
ECONOMIZER
BLOWER
7a
9
HEAT 1
1 7c
HEAT 2
COOL 2
6 12
COOL 1
14
Page 84
7b
17
2
16
15
3
10
18
5
13
11
4
24V COMMON
Economizer Footnotes
Unit Footnotes
C2-1 DIAGRAM WITH D8 DIAGRAM
Electromechanical Thermostat with ThreePosition Economizer and Warm Up
6-C2-1 Section with D8 Section
An optional feature of the REMD16 and EMDH16 Economizer is a warm-up kit which holds
economizer outdoor air dampers closed during night heat operation and while the CHA16 is
warming the building after night setback. The warm-up kit temporarily disables the econo
mizer (dampers are held closed) during morning warm-up to keep cool outside air from being
mixed with return air. Once the temperature setpoint is reached, the economizer is allowed
to operate normally (outdoor air dampers open to mid position to allow for required minimum
air exchange).
NOTE - In order to understand how optional controls affect operation of the CHA16, you
must first read and understand how all the CHA16 components work.
NOTE 1-The warm-up kit requires the use of optional time clock CMC3-1.
2-Optional field installed night relay (not shown - see C11 diagram) and night thermostat
S12 are also required. Field wiring is shown in figure 52.
3-The warm-up kit can only be applied to CHA16 units with economizer.
Page 85
WARNING - CONNECT ONLY RELAY KITS DESIGNED FOR THIS CONTROL SYS
TEM. RELAY KITS DESIGNED FOR OTHER CONTROL SYSTEMS ARE NOT COM
PATIBLE AND CONTROL DAMAGE OR FAILURE WILL RESULT. FOR EXAMPLE, A
W973 RELAY KIT MUST NOT BE CONNECTED TO AN ELECTROMECHANICAL
THERMOSTAT CONTROL SYSTEM.
WARNING - BE CAREFUL TO CONNECT RELAY KITS TO THE PROPER JACK AND
PLUG IN THE CHA16 BLOWER COMPARTMENT. REFER TO WIRING DIAGRAM. IM
PROPER CONNECTION WILL CAUSE CONTROL FAILURE.
The warm-up kit mounts in the control mounting area of the CHA16 blower compartment. No
wiring is required. Jumper plug P3 is removed and discarded. Warm-up kit harness plug P8
connects directly into jack J3 in the blower compartment. Warm-up kit harness jack J8 con
nects to economizer harness plug P4.
Operation Sequence:
NOTE - This operation sequence emphasizes warmup kit operation. Unit diagram has
been omitted.
1- When relay K41 is energized during normal operation, the economizer functions normally
and is locked in until night setback.
2- Economizer outdoor air dampers drive full closed anytime blower B3 is not operating.
Night Setback:
3- Time clock CMC3-1 should be adjusted so that clock contacts remain closed during hours
when the building is not occupied. The contacts are set to open shortly (usually 1 hour) be
fore the building is to be occupied.
4- When clock contacts close, relay K11 (not shown) in the economizer and K42 in the warm-up
kit are energized.
5- Contacts K11-1 open to disconnect power to thermostat S1. K11-2 (not shown) open to drive
the dampers full closed.
6- Contacts K42-1 open to disengage relay K41.
7- When relay K41 disengages, power is disconnected to the economizer:
a-Contacts K41-1 open to lock out economizer operation.
b-Contacts K41-2 close (not used).
c-Contacts K41-3 open to disconnect power to the economizer.
d-Contacts K41-4 open (not used).
8- During unoccupied periods, K11-1 opens and S1 is disabled. When S12 closes, power is
returned to S1 and the unit operates (heating demand) normally. When S12's setpoint is
reached, S12 opens, S1 is disabled and unit operation stops.
9- Blower operates only on demand energized by CHA16 heat relay K25 when S12 is closed.
10- Thermostat S1 and economizer remain inoperable until time clock CMC3-1 contacts open.
First Heat Demand After Night Setback (Begin Warm-Up)
11- Shortly before the building is to be occupied, time clock CMC3-1 contacts open.
12- Relay K42 disengages and contacts K42-1 close.
13- Relay K11 disengages. Contacts K11-1 close to allow power to thermostat S1. Contacts
K11-2 close to allow outdoor air dampers to open. Note that dampers remain closed until
relays K3 and K41 are energized.
14- Since contacts K40-1 are normally closed and contacts K42-1 have just switched closed,
timer DL7 is energized. Timer DL7 is normally open and closes 30 seconds after being ener
gized.
15- If heat demand W1 reaches relay K40 before delay DL7 closes, contacts K40-1 open, delay
DL7 loses power and resets and the economizer is locked out for the first heat demand by
relay K41 (contacts K41-3 remain open). If heat demand W1 reaches relay K40 after delay
DL7 closes, relay K41 energizes and the economizer locks in for the day until night setback.
16- When first heat demand is satisfied, relay K40 disengages and relay contacts K40-1 close.
Relay contacts K42-1 are already closed (clock contacts open). Time delay DL7 begins 30
second count. If a second heat demand W1 reaches relay K42 within 30 seconds, delay DL7
loses power and resets. If a second heat demand W1 does not reach relay K42 within 30
sec., time delay DL7 contacts close and relay K41 energizes.
17-When relay K41 energizes, the economizer is allowed to operate normally, controlled by relay
K3:
a-Contacts K41-1 close to lock in economizer operation until night setback.
b-Contacts K41-2 open (not used).
c-Contacts K41-3 close to allow power to the economizer.
d-Contacts K41-4 close (not used).
18- Once energized, relay K41 locks in and the economizer operates until relay K42 is energized
by night setback (contacts K42-1 open to disengage relay K41).
C2-1 diagram with D5 diagram
electromechanical thermostat with modulating economizer and warm-up
24V POWER
8
5
ECONOMIZER
13
BLOWER
7c
HEAT 1
7a 12
9
HEAT 2
COOL 2
6
COOL 1
16 14
Page 86
7b
18
5
12
3 10 11
1
17
24V COMMON
Thermostat Footnotes
15
4
Economizer Footnotes
13
13
2
C2-1 DIAGRAM WITH D5 DIAGRAM
Electromechanical Thermostat with Modulating Economizer and WarmUp
7-C2-1 Section with D5 Section
An optional feature of the REMD16M and EMDH16M Economizer is a warm-up kit which
holds economizer outdoor air dampers closed during night heat operation and while the
CHA16 is warming the building after night setback. The warm-up kit temporarily disables the
economizer (outdoor dampers are held closed) during morning warm-up to keep cool out
side air from being mixed with return air. Once the temperature setpoint is reached, the econ
omizer is allowed to operate normally (outdoor air dampers open to minimum position to al
low required minimum air exchange.
NOTE - In order to understand how optional controls affect operation of the CHA16, you
must first read and understand how all the CHA16 components work.
NOTE 1-The warm-up kit requires the use of optional time clock CMC3-1.
2-Optional field installed night relay K11 (may or may not be factory installed in econo
mizer) and night thermostat S12 are also required.
3-The warm-up kit can only be applied to CHA16s with economizer.
Page 87
WARNING - CONNECT ONLY RELAY KITS DESIGNED FOR THIS CONTROL SYS
TEM. RELAY KITS DESIGNED FOR OTHER CONTROL SYSTEMS ARE NOT COM
PATIBLE AND CONTROL DAMAGE OR FAILURE WILL RESULT. FOR EXAMPLE, A
W973 RELAY KIT MUST NOT BE CONNECTED TO AN ELECTROMECHANICAL
THERMOSTAT CONTROL SYSTEM.
WARNING - BE CAREFUL TO CONNECT RELAY KITS TO THE PROPER JACK AND
PLUG IN THE CHA16 BLOWER COMPARTMENT. REFER TO WIRING DIAGRAM. IM
PROPER CONNECTION WILL CAUSE CONTROL FAILURE.
The warm-up kit mounts in the control mounting area of the CHA16 blower compartment. No
wiring is required. Jumper plug P3 is removed and discarded. Warm-up kit harness plug P8
connects directly into jack J3 in the blower compartment. Warm-up kit harness jack J8 con
nects to economizer harness plug P4.
Operation Sequence:
NOTE-This operation sequence emphasizes warm-up kit operation. Unit diagram has
been omitted.
1- When relay K41 is energized during normal operation, the economizer functions normally
and is locked in until night setback.
2- Economizer outdoor air dampers drive full closed anytime blower B3 is not operating.
Night Setback:
3- Time clock CMC3-1 should be adjusted so that clock contacts remain closed during hours
when the building is not occupied. The contacts are set to open shortly (usually 1 hour) be
fore the building is to be occupied.
4- When clock contacts close, relay K11 in the economizer and K42 in the warm-up kit are en
ergized.
5- Contacts K11-1 open to disconnect power to thermostat S1. K11-2 contacts open to drive
the dampers full closed.
6- Contacts K42-1 open to disengage relay K41.
7- When relay K41 disengages, power is disconnected to the economizer:
a-Contacts K41-1 open to lock out economizer operation.
b-Contacts K41-2 close (not used).
c-Contacts K41-3 open to disconnect power to the economizer.
d-Contacts K41-4 open (not used).
8- During unoccupied periods, K11-1 opens and S1 is disabled. When S12 closes, power is
returned to S1 and the unit operates (heating demand) normally. When S12's setpoint is
reached, S12 opens, S1 is disabled and unit operation stops.
9- Blower operates only on demand energized by CHA16 heat relay K25 when S12 is closed.
10- Thermostat S1 and economizer remain inoperable until time clock CMC3-1 contacts open.
First Heat Demand After Night Setback (Begin Warm Up)
11- Shortly before the building is to be occupied, time clock CMC3-1 contacts open.
12- Relay K42 disengages and contacts K42-1 close.
13- Relay K11 disengages. Contacts K11-1 close to allow power to thermostat S1. Contacts
K11-2 close to allow outdoor air dampers to open. Note that dampers remain closed until
relays K3 and K41 are energized.
14- Since contacts K40-1 are normally closed and contacts K42-1 have just switched closed,
timer DL7 is energized. Timer DL7 is normally open and closes 30 seconds after being ener
gized.
15- If heat demand W1 reaches relay K40 before delay DL7 closes, contacts K40-1 open, delay
DL7 loses power and resets and the economizer is locked out for the first heat demand by
relay K41 (contacts K41-3 remain open). If heat demand W1 reaches relay K40 after delay
DL7 closes, relay K41 energizes and the economizer locks in for the day until night setback.
16- When first heat demand is satisfied, relay K40 disengages and relay contacts K40-1 close.
Relay contacts K42-1 are already closed (clock contacts open). Time delay DL7 begins 30
second count. If a second heat demand W1 reaches relay K42 within 30 sec., delay DL7
loses power and resets. If a second heat demand W1 does not reach relay K42 within 30
sec., time delay DL7 contacts close and relay K41 energizes.
17-When relay K41 energizes, the economizer is allowed to operate normally, controlled by
relay K3:
a-Contacts K41-1 close to lock in economizer operation until night setback.
b-Contacts K41-2 open (not used).
c-Contacts K41-3 close to allow power to the economizer.
d-Contacts K41-4 close (not used).
18- Once energized, relay K41 locks in and the economizer operates until relay K42 is energized
by night setback (contacts K42-1 open to disengage relay K41).
C11-1 diagram
electromechanical thermostat with night setback relay kit
24V POWER
3
ECONOMIZER
BLOWER
4
HEAT 1
HEAT 2
COOL 2
COOL 1
Page 88
1
24V COMMON
5
2
C11 DIAGRAM
Electromechanical Thermostat
with Night Setback Thermostat
and without Economizer
Page 89
8-C11 SECTION (electromechanical thermostat with night relay kit)
Optional night (setback relay) kit allows CHA16 units without economizer (REMD16 or
EMDH16) to automatically set back the thermostat to reduce energy consumption during
times when the building is not occupied. The night kit achieves this by electrically disconnect
ing thermostat S1 and connecting a night thermostat during periods when the building is not
occupied. The night thermostat can then be adjusted with a lower setpoint as needed for un
occupied heating.
NOTE - In order to understand how these optional controls affect the operation of the
CHA16, you must first understand how all CHA16 components work. Refer to the operation
sequence for basic unit operation.
WARNING - CONNECT ONLY RELAY KITS DESIGNED FOR THIS CONTROL SYS
TEM. RELAY KITS DESIGNED FOR OTHER CONTROL SYSTEMS ARE NOT COM
PATIBLE AND CONTROL DAMAGE OR FAILURE WILL RESULT. FOR EXAMPLE, ON
UNITS USING AN ELECTROMECHANICAL THERMOSTAT WITHOUT AN ECON
OMIZER, A WARM-UP KIT MUST NOT BE CONNECTED. ONLY THE OPTIONAL
NIGHT KIT CAN BE USED.
WARNING - BE CAREFUL TO CONNECT RELAY KITS TO THE PROPER JACK AND
PLUG IN THE CHA16 BLOWER COMPARTMENT. REFER TO WIRING DIAGRAM. IM
PROPER CONNECTION WILL CAUSE CONTROL FAILURE.
NOTE 1-The night kit accessory requires the use of optional time clock CMC3-1/ and optional
night thermostat.
2-The time clock accessory requires the use of field wired night kit relay K11.
No wiring is required for installing the kit. Jumper plug P3 is removed from the unit and dis
carded. Night kit harness plug P4 connects directly into jack J3 in the unit blower compart
ment.
Night Setback:
NOTE-This operation sequence emphasizes night kit operation. Unit diagram has
been omitted.
1- Time clock CMC3-1 contacts are open during normal operation of the unit when the building
is occupied. All cooling and heating stages function normally.
2- When clock contacts switch closed (when the building is not occupied) relay K11 is
energized.
3- When relay K11 is energized, contacts K11-1 open disconnecting power to thermostat S1.
Thermostat S1 remains disconnected until clock contacts open (usually 1 hour before the
building is to be occupied). During the time thermostat S1 is disconnected, night thermostat
S12, which has been set at a lower setpoint than S1, controls operation of the unit.
During unoccupied periods, K11-1 opens and S1 is disabled. When S12 closes, power is
supplied to S1 and the unit operates normally. When S12's setpoint opens, S1 is disabled
and unit operation stops.
4- The blower operates as normal, controlled by heating demand when S12 is closed.
5- Shortly before the building is to be occupied, time clock CMC3-1 contacts open and relay
K11 is de-energized. Contacts K11-1 then close and power is restored to thermostat S1.
A28 diagram with B30 diagram
5kw residential electric heat matched
to singlephase air conditioner
3
1
Page 90
5
2
4
7
8
6
A28 DIAGRAM WITH B30 DIAGRAM
ECH16 5kw SinglePhase Electric Heat with CHA16, CHA16R or CHA16H
9-A28 SECTION with B30 SECTION
This section explains the operation sequence of optional electric heating units. Thermostat
and optional economizer wiring diagrams are omitted from this section in order to simplify the
operation sequence.
Optional ECH16R5 electric heat is a singlephase heating unit designed for residential use.
The R" designation denotes that this electric heat unit cannot interact with commercial unit
economizer dampers to provide minimum air exchange during heating mode.
The ECH16R unit plugs in to the CHA16 using jackplugs J2/P2. No field wiring is required.
ECH16R Operation Sequence:
NOTE-This operation sequence emphasizes electric heat operation. Thermostat diagram
has been omitted.
1- When disconnect is closed, line voltage is supplied to unit controls and indoor thermostat.
2- On a call for indoor blower from the thermostat, blower relay K3 is energized. Relay K3 is not
energized during heating operation and K3 contacts remain in normally closed position.
3- Normally closed K31 contacts allow optional electric heat unit to energize (optional) econo
mizer damper for minimum air exchange during a call for heat (does not apply to ECH16R
units).
4- Normally closed K32 contacts allow optional electric heat unit to control indoor blower op
eration.
5- On a call for heat (thermostat W1), thermal heat relay K32 and resistor R6 are energized.
Within 1110 seconds, contacts K321 close followed by K322.
6- When K321 closes, line voltage is routed through K32 to energize the medhigh indoor
blower tap. The indoor blower begins operating.
7- When K322 closes, heating element HE1 is energized. Note that the indoor blower may op
erate for several seconds before the heating element is energized.
8- When heating demand stops, heat relay K32 cycles off on a laston firstoff basis.
Page 91
A29 diagram with B30 diagram
7kw or 10kw residential electric heat
matched to singlephase air conditioner
3
5
Page 92
1
2
4
7
8
9
6
A29 DIAGRAM WITH B30 DIAGRAM
ECH16R 7kw or 10kw SinglePhase Electric Heat with CHA16, CHA16R or CHA16H
Page 93
10-A29 SECTION with B30 SECTION
This section explains the operation sequence of optional electric heating units. Thermostat
and optional economizer wiring diagrams are omitted from this section in order to simplify the
operation sequence.
Optional ECH16R7, -10 electric heat are singlephase heating units designed for residential
use. The R" designation denotes that this electric heat unit cannot interact with commercial
unit economizer dampers to provide minimum air exchange during heating mode.
The ECH16R units plug in to the CHA16 using jackplugs J2/P2. No field wiring is required.
Thermal heat relays K31 and K32 in the ECH16R7 and ECH16R10 are unique. The relays
are physically connected to each other yet are electrically independent. Since the relays are
electrically independent each is marked with its own key number. The timings are the same
and any variance may be accounted for by the tolerance of the relays. If either relay fails,
both must be replaced as a single unit.
ECH16R Operation Sequence:
NOTE - This operation sequence emphasizes electric heat operation. Thermostat diagram
has been omitted.
1- When disconnect is closed, line voltage is supplied to unit controls and indoor thermostat.
2- On a call for indoor blower from the thermostat, blower relay K3 is energized. Relay K3 is not
energized during heating operation and K3 contacts remain in normally closed position.
3- Normally closed K31 contacts allow optional electric heat unit to energize (optional) econo
mizer damper for minimum air exchange during a call for heat (does not apply to ECH16R
units).
4- Normally closed K32 contacts allow optional electric heat unit to control indoor blower op
eration.
5- On a call for heat (thermostat W1), thermal heat relays K32 and K33 are energized. Within
1110 seconds, contacts K321 and K331 close followed by K322 and K332.
6- When either K321 or K331 close, line voltage is routed through K32 to energize the med
high indoor blower tap (K32 and K33 operate independently). The indoor blower begins op
erating.
7- When K322 closes, heating element HE1 is energized. Note that the indoor blower may op
erate for several seconds before the heating element is energized.
8- When K332 closes, heating element HE2 is energized. Note that the indoor blower may op
erate for several seconds before the heating element is energized.
9- When heating demand stops, heat relays K32 and K33 cycle off on a laston firstoff basis.
A12 diagram with B30 diagram
15kw, 20kw or 25kw electric heat
matched to singlephase air conditioner
6
3
5
2
Page 94
1
4
8
7
9
A12 DIAGRAM WITH B30 DIAGRAM
ECH16 15kw, 20kw or 25kw SinglePhase Electric Heat with CHA16, CHA16R or CHA16H
11-A12 SECTION with B30 SECTION
This section explains the operation sequence of optional electric heating units. Thermostat
and optional economizer wiring diagrams are omitted from this section in order to simplify the
operation sequence.
Optional ECH1615, -20 and 25 singlephase electric heat units are designed for residential
or commercial use. These units are capable of directing optional economizer dampers to
allow minimum fresh air exchange during electric heat operation.
The ECH16 units plug in to the CHA16 using jackplugs J2/P2. No field wiring is required.
ECH16R Operation Sequence:
NOTE - This operation sequence emphasizes electric heat operation. Thermostat diagram
has been omitted.
1- When disconnect is closed, line voltage is supplied to unit controls and indoor thermostat.
2- On a call for indoor blower from the thermostat, blower relay K3 is energized. Relay K3 is not
energized during heating operation and K3 contacts remain in normally closed position.
3- Normally closed K31 contacts allow optional electric heat unit to energize (optional) econo
mizer damper for minimum air exchange during a call for heat.
4- Normally closed K32 contacts allow optional electric heat unit to control indoor blower op
eration.
5- On a call for heat (thermostat W1), economizer/heat relay K43 is energized. K431 and
K432 immediately close.
6- When K431 contacts close, heat relays K15, K16 and K17 are energized. K151, K161 and
K171 immediately close.
7- When K432 contacts close, line voltage is routed through K32 to energize the medhigh
indoor blower tap. The indoor blower begins operating.
8- When 151 closes, heating element HE1 is energized. When 161 closes, heating element
HE2 is energized. When 171 closes, heating element HE3 is energized.
9- When heating demand stops, economizer/heat relay K43 is deenergized and K431 and
K432 open immediately. All three heating elements and the indoor blower are deenergized
simultaneously.
Page 95
A13 diagram with B31 diagram
5kw, 7kw, 10kw or 15kw electric heat matched to
208/230V threephase air conditioner
6
3
5
2
Page 96
1
7
8
9
4
A13 DIAGRAM WITH B31 DIAGRAM
ECH16 5kw, 7kw, 10kw or 15kw 208/230V ThreePhase Electric Heat with CHA16
12-A13 SECTION with B31 SECTION
This section explains the operation sequence of optional electric heating units. Thermostat
and optional economizer wiring diagrams are omitted from this section in order to simplify the
operation sequence.
Optional ECH165, -7, 10 and 15 threephase electric heat units are designed for commer
cial use. These units are capable of directing optional economizer dampers to allow mini
mum fresh air exchange during electric heat operation.
The ECH16 units plug in to the CHA16 using jackplugs J2/P2. No field wiring is required.
ECH16 Operation Sequence:
NOTE-This operation sequence emphasizes electric heat operation. Thermostat diagram
has been omitted.
1- When disconnect is closed, line voltage is supplied to unit controls and indoor thermostat.
2- On a call for indoor blower from the thermostat, blower relay K3 is energized. Relay K3 is not
energized during heating operation and K3 contacts remain in normally closed position.
3- Normally closed K31 contacts allow optional electric heat unit to energize (optional) econo
mizer damper for minimum air exchange during a call for heat.
4- Normally closed K32 contacts allow optional electric heat unit to control indoor blower op
eration.
5- On a call for heat (thermostat W1), economizer/heat relay K43 is energized. K431 and
K432 immediately close.
6- When K431 contacts close, heating contactor K15 is energized. Contacts K151 immedi
ately close.
7- When K432 contacts close, line voltage is routed through K32 to energize the medhigh
indoor blower tap. The indoor blower begins operating.
8- When 151 closes, heating elements HE1, HE2 and HE3 are energized. HE1, HE2 and HE3
are connected in a delta" configuration for threephase operation.
9- When heating demand stops, economizer/heat relay K43 is deenergized and K431 and
K432 open immediately. All three heating elements and the indoor blower are deenergized
simultaneously.
Page 97
A14 diagram with B31 diagram
20kw or 25kw electric heat matched to
208/230V threephase air conditioner
6
3
9
5
2
Page 98
1
7
8
10
11
4
A14 DIAGRAM WITH B31 DIAGRAM
ECH16 20kw or 25kw 208/230V ThreePhase Electric Heat with CHA16
Page 99
13-A14 SECTION with B31 SECTION
This section explains the operation sequence of optional electric heating units. Thermostat
and optional economizer wiring diagrams are omitted from this section in order to simplify the
operation sequence.
Optional ECH1620 and 25 208/230V threephase electric heat units are designed for com
mercial use. These units are capable of directing optional economizer dampers to allow mini
mum fresh air exchange during electric heat operation.
The ECH16 units plug in to the CHA16 using jackplugs J2/P2. No field wiring is required.
ECH16 Operation Sequence:
NOTE-This operation sequence emphasizes electric heat operation. Thermostat diagram
has been omitted.
1- When disconnect is closed, line voltage is supplied to unit controls and indoor thermostat.
2- On a call for indoor blower from the thermostat, blower relay K3 is energized. Relay K3 is not
energized during heating operation and K3 contacts remain in normally closed position.
3- Normally closed K31 contacts allow optional electric heat unit to energize (optional) econo
mizer damper for minimum air exchange during a call for heat.
4- Normally closed K32 contacts allow optional electric heat unit to control indoor blower op
eration.
5- On a call for heat (thermostat W1), economizer/heat relay K43 is energized. K431 and
K432 immediately close.
6- When K431 contacts close, heating contactor K15 and timedelay DL2 are both energized.
Contacts K151 immediately close. DL2 begins 30 second count before closing.
7- When K432 contacts close, line voltage is routed through K32 to energize the medhigh
indoor blower tap. The indoor blower begins operating.
8- When 151 closes, heating elements HE1, HE2 and HE3 are energized. HE1, HE2 and HE3
are connected in a delta" configuration for threephase operation.
9- After 30 second count, time delay DL2 closes and energizes heating contactor K16. K161
closes immediately.
10- When K161 closes, heating elements HE4, HE5 and HE6 are energized. HE4, HE5 and
HE6 are connected in a delta" configuration for threephase operation.
11- When heating demand stops, economizer/heat relay K43 is deenergized and K431 and
K432 open immediately. All three heating elements connected to K15 and the indoor blower
are deenergized simultaneously. All three heating elements connected to K16 are deener
gized when DL2 contacts open (about one second later).
A15 diagram with B32 diagram
7kw, 10kw, 15kw, 20kw or 25kw electric heat matched
to 460V or 575V threephase
air conditioner
3
5
2
Page 100
1
6
7
4
8
9
A15 DIAGRAM WITH B32 DIAGRAM
ECH16 7kw, 10kw, 15kw, 20kw or 25kw
460V or 575V ThreePhase Electric Heat with CHA16
14-A15 SECTION with B32 SECTION
This section explains the operation sequence of optional electric heating units. Thermostat
and optional economizer wiring diagrams are omitted from this section in order to simplify the
operation sequence.
Optional ECH16 460V and 575V threephase electric heat units are designed for commercial
use. These units are capable of directing optional economizer dampers to allow minimum
fresh air exchange during electric heat operation.
The ECH16 units plug in to the CHA16 using jackplugs J2/P2. No field wiring is required.
ECH16 Operation Sequence:
NOTE-This operation sequence emphasizes electric heat operation. Thermostat diagram
has been omitted.
1- When disconnect is closed, line voltage is supplied to unit controls and indoor thermostat.
2- On a call for indoor blower from the thermostat, blower relay K3 is energized. Relay K3 is not
energized during heating operation and K3 contacts remain in normally closed position.
3- Normally closed K31 contacts allow optional electric heat unit to energize (optional) econo
mizer damper for minimum air exchange during a call for heat.
4- Normally closed K32 contacts allow optional electric heat unit to control indoor blower op
eration.
5- On a call for heat (thermostat W1), economizer/heat relay K43 is energized. K431 and
K432 immediately close.
6- When K431 contacts close, heating contactor K15 is energized. Contacts K151 immedi
ately close.
7- When K432 contacts close, line voltage is routed through K32 to energize the medhigh
indoor blower tap. The indoor blower begins operating.
8- When 151 closes, heating elements HE1, HE2 and HE3 are energized. HE1, HE2 and HE3
are connected in a wye" configuration for threephase operation.
9- When heating demand stops, economizer/heat relay K43 is deenergized and K431 and
K432 open immediately. All heating elements and the indoor blower are deenergized si
multaneously.
Page 101
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement