R-410A T**ZF - Surplus City Liquidators

R-410A
T**ZF
3 - 5 Ton
60 Hertz
TABLE OF CONTENTS
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Safety Information. . . . . . . . . . . . . . . . . . . . . . . 5
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 13
Checking Supply Air CFM . . . . . . . . . . . . . . . . . . . . . . . . . 27
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . 28
No Outdoor Air Options . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . .
Gas Heating Sequence Of Operations . . . . . . . . . . . . . . .
Gas Heat Operation Errors . . . . . . . . . . . . . . . . . . . . . . . .
Flash Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Anticipator Setpoints. . . . . . . . . . . . . . . . . . . . . . . . .
Start-up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan On And Off Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
28
29
29
30
30
30
30
31
33
34
34
42
LIST OF TABLES
1
2
3
4
5
6
7
8
9
10
11
T03 thru 05ZF Unit Limitations . . . . . . . . . . . . . . . . . . . . . 6
Weights and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 8
T03 thru 05ZF Unit Accessory Weights . . . . . . . . . . . . . . 8
T03 thru 05ZF Unit Clearances . . . . . . . . . . . . . . . . . . . . 10
T03 thru 05ZF Utilities Entry . . . . . . . . . . . . . . . . . . . . . . 11
Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Gas Heat Application Data . . . . . . . . . . . . . . . . . . . . . . . 17
Gas Pipe Sizing - CapacIty of Pipe . . . . . . . . . . . . . . . . . 18
Altitude/Temperature Correction Factors . . . . . . . . . . . . 21
1
2
3
4
5
T03 thru 05ZF Component Location . . . . . . . . . . . . . . . . 6
Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
T03 thru 05ZF Cooling Only/Electric Heat Front View
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
T03 thru 05ZF Cooling Only/Gas Heat Front View Physical
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
T03 thru 05Z Fixed Outdoor Air Motorized Damper Rain
Hood Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . 10
T03 thru 05ZF Disconnect Location . . . . . . . . . . . . . . . . 10
T03 thru 05ZF Unit Side Duct Openings . . . . . . . . . . . . 11
T03 thru 05ZF Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . 11
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Compressor Restraining Bracket . . . . . . . . . . . . . . . . . . 13
12
13
14
15
16
17
18
19
20
21
T**ZF Blower Performance Side Duct . . . . . . . . . . . . . .
T**ZF Blower Performance Bottom Duct . . . . . . . . . . . .
Belt Drive RPM Selection . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Blower Specifications (Belt Drive) . . . . . . . . . . . .
Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . .
Single Stage Gas Heat Limit Control Setting . . . . . . . . .
Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . .
Gas Rate-Cubit Feet per Hour . . . . . . . . . . . . . . . . . . . .
Unit Control Board Flash Codes . . . . . . . . . . . . . . . . . . .
Ignition Control Board Flash Codes . . . . . . . . . . . . . . . .
23
25
26
26
27
30
30
33
42
42
LIST OF FIGURES
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Typical Field Power and Control Wiring . . . . . . . . . . . . .
Side Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . .
Bottom Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . .
Vent And Combustion Air Hood . . . . . . . . . . . . . . . . . . .
Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Altitude/Temperature Correction Factors . . . . . . . . . . . .
Pressure Drop Across Coil . . . . . . . . . . . . . . . . . . . . . . .
Gas Valve Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Single Stage Gas Valves . . . . . . . . . . . . . . . . . .
Proper Flame Adjustment . . . . . . . . . . . . . . . . . . . . . . .
Typical Flame Appearance . . . . . . . . . . . . . . . . . . . . . .
T03ZF (3.0 Ton) Operating Pressures . . . . . . . . . . . . . .
T04ZF (4.0 Ton) Operating Pressures . . . . . . . . . . . . . .
T05ZF (5.0 Ton) Operating Pressures . . . . . . . . . . . . . .
Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
18
18
20
20
21
27
29
31
32
32
36
36
37
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691696-UIM-A-0311
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General
Model T**ZF units are either single package cooling units or
single package gas-fired central heating furnaces with cooling
unit. Both are designed for outdoor installation on a rooftop or
slab.
The units are completely assembled on rigid, permanently
attached base rails. All piping, refrigerant charge, and electrical
wiring is factory installed and tested. The units require electric
power, gas connection, duct connections, installation of the
weatherproof convenience outlet cover, combustion air inlet
hood, flue gas outlet hoods and fixed outdoor air intake damper
(units without economizer or motorized damper option only) at
the point of installation.
The gas-fired heaters have aluminized-steel tubular heat
exchangers. The units have spark ignition with proven pilot. All
gas heaters are shipped from the factory equipped for natural
gas use, but can be field converted to L.P./ Propane with Kit
Model #1NP0440 for single stage.
Safety Considerations
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury. Improper installation,
adjustment, alteration, service or maintenance can
cause injury or property damage. Refer to this manual.
For assistance or additional information consult a
qualified installer, service agency or the gas supplier.
This system uses R-410A Refrigerant which operates at
higher pressures than R-22. No other refrigerant may be
used in this system. Gage sets, hoses, refrigerant
containers and recovery systems must be designed to
handle R-410A. If you are unsure, consult the equipment
manufacturer. Failure to use R-410A compatible servicing
equipment may result in property damage or injury.
This is a safety alert symbol. When you see this symbol
on labels or in manuals, be alert to the potential for
personal injury.
Understand and pay particular attention the signal words
DANGER, WARNING or CAUTION.
DANGER indicates an imminently hazardous situation, which,
if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation, which,
if not avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation, which, if
not avoided may result in minor or moderate injury. It is also
used to alert against unsafe practices and hazards involving
only property damage.
If the information in this manual is not followed exactly, a
fire or explosion may result causing property damage,
personal injury or loss of life.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
a. Do not try to light any appliance.
b. Do not touch any electrical switch; do not use any
phone in your building.
c. Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
d. If you cannot reach your gas supplier, call the fire
department.
Improper installation may create a condition where the
operation of the product could cause personal injury or
property damage. Improper installation, adjustment,
alteration, service or maintenance can cause injury or
property damage. Refer to this manual for assistance or
for additional information, consult a qualified contractor,
installer or service agency.
This product must be installed in strict compliance with
the installation instructions and any applicable local,
state and national codes including, but not limited to
building, electrical, and mechanical codes.
2
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
Due to system pressure, moving parts, and electrical
components, installation and servicing of air conditioning
equipment can be hazardous. Only qualified, trained service
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions
of cleaning coils and filters and replacing filters.
Observe all precautions in the literature, labels, and tags
accompanying the equipment whenever working on air
conditioning equipment. Be sure to follow all other applicable
safety precautions and codes including ANSI Z223.1 or CSAB149.1- latest edition.
Wear safety glasses and work gloves. Use quenching cloth and
have a fire extinguisher available during brazing operations.
Johnson Controls Unitary Products
691696-UIM-A-0311
Inspection
Renewal Parts
As soon as a unit is received, it should be inspected for possible
damage during transit. If damage is evident, the extent of the
damage should be noted on the carrier’s freight bill. A separate
request for inspection by the carrier’s agent should be made in
writing.
Contact your local UP parts distribution center for authorized
replacement parts.
This product must be installed in strict compliance with
the enclosed installation instructions and any applicable
local, state and national codes including, but not limited
to, building, electrical, and mechanical codes.
Approvals
Design certified by CSA as follows:
1.
For use as a cooling only unit, cooling unit with
supplemental electric heat or a forced air furnace.
2.
For outdoor installation only.
3.
For installation on combustible material.
4.
For use with natural gas (convertible to LP with kit).
The furnace and its individual shut-off valve must be
disconnected from the gas supply piping system during
any pressure testing at pressures in excess of 1/2 PSIG.
Pressures greater than 1/2 PSIG will cause gas valve
damage resulting in a hazardous condition. If it is
subjected to a pressure greater than 1/2 PSIG, the gas
valve must be replaced.
The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 PSIG.
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691696-UIM-A-0311
Product Nomenclature
T04 Z F N08 A 2 A AA 2 A
Nominal Cooling Capacity
Product Style
T03 = 3.0 Ton
T04 = 4.0 Ton
T05 = 5.0 Ton
A = Style A
Product Generation
Product Category
2 = Second Generation
Z = A/C, Single Pkg., R-410A
Additional Options
Product Identifier
AA = None
F = 13.0 SEER, A/C
Installation Options
Heat Type and Nominal Heat Capacity
A = No Options Installed
C00 = Cooling Only. Suitable for Field
Installed Electric Heat
Voltage
Gas Heat Options
1 = 208/230-1-60
2 = 208/230-3-60
4 = 460-3-60
5 = 575-3-60
N08 = 80 MBH Output Aluminized Steel, 1 Stage
(T03, T05)
N10 = 100 MBH Output Aluminized Steel, 1 Stage
(T04, T05)
Airflow
A = Direct Drive
N = Belt Drive
4
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691696-UIM-A-0311
Installation
Installation Safety Information
Read these instructions before continuing this appliance
installation. This is an outdoor combination heating and cooling
unit. The installer must assure that these instructions are made
available to the consumer and with instructions to retain them
for future reference.
1.
Refer to the unit rating plate for the approved type of gas
for this product.
2.
Install this unit only in a location and position as specified
on Page 7 of these instructions.
3.
4.
5.
Never test for gas leaks with an open flame. Use
commercially available soap solution made specifically for
the detection of leaks when checking all connections, as
specified on Pages 5, 19 and 31 of these instructions.
Always install furnace to operate within the furnace's
intended temperature-rise range with the duct system and
within the allowable external static pressure range, as
specified on the unit name/rating plate, specified in Table 9
of these instructions.
This equipment is not to be used for temporary heating of
buildings or structures under construction.
2.
National Fuel Gas Code, ANSI Z223.1 - Latest Edition
3.
Gas-Fired Central Furnace Standard, ANSI Z21.47a. Latest Edition
4.
Local building codes, and
5.
Local gas utility requirements
In Canada:
1.
Canadian Electrical Code, CSA C22.1
2.
Installation Codes, CSA - B149.1.
3.
Local plumbing and waste water codes, and
4.
Other applicable local codes.
Refer to unit application data found in this document.
After installation, gas fired units must be adjusted to obtain a
temperature rise within the range specified on the unit rating
plate.
If components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or customer’s
expense.
Size of unit for proposed installation should be based on heat
loss/heat gain calculation made according to the methods of Air
Conditioning Contractors of America (ACCA).
This furnace is not to be used for temporary heating of buildings
or structures under construction.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
Limitations
These units must be installed in accordance with the following:
In U.S.A.:
1.
The Simplicity® control board used in this product will
effectively operate the cooling system down to 0°F when
this product is applied in a comfort cooling application
for people. An economizer is typically included in this
type of application. When applying this product for
process cooling applications (computer rooms,
switchgear, etc.), please reference applications bulletin
AE-011-07 or call the applications department for
Unitary Products @ 1-877-UPG-SERV for guidance.
Additional accessories may be needed for stable
operation at temperatures below 30° F.
National Electrical Code, ANSI/NFPA No. 70 - Latest
Edition
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691696-UIM-A-0311
Belt drive or
Direct drive
blower
Electric heat
accessory location
20 Gauge aluminized
steel tubular heat exchanger
Power ventor motor with
post purge cycle
High efficiency
compressor
Economizer
hood
(accessory)
Micro-Channel
Aluminum Tube/
Aluminum Fin
Condenser
Slide-in
economizer
(accessory)
Smoke
detector
(accessory)
Full perimeter baserails
with forklift slots and
lifting holes
Knockout for side
gas supply entry
3/4" PVC female
condensate drain
Simplicity ®
control board
Knockout for
side power and
control entry
Figure 1: T03 thru 05ZF Component Location
Table 1:
T03 thru 05ZF Unit Limitations
Unit Limitations
Size
(Tons)
T03
(3.0)
T04
(4.0)
T05
(5.0)
6
Unit Voltage
Applied Voltage
Outdoor DB Temp
Min
Max
Max (°F)
208/230-3-60
187
252
125
208/230-3-60
187
252
125
575-3-60
540
630
125
208/230-1-60
187
252
125
208/230-3-60
187
252
125
460-3-60
432
504
125
575-3-60
540
630
125
Johnson Controls Unitary Products
691696-UIM-A-0311
Location
codes. Refer to Table 4 for clearances required for combustible
construction, servicing, and proper unit operation.
Use the following guidelines to select a suitable location for
these units:
1.
Unit is designed for outdoor installation only.
2.
Condenser coils must have an unlimited supply of air.
Where a choice of location is possible, position the unit on
either north or east side of building.
3.
Suitable for mounting on roof curb.
4.
For ground level installation, use a level concrete slab with
a minimum thickness of 4 inches. The length and width
should be at least 6 inches greater than the unit base rails.
Do not tie slab to the building foundation.
5.
Roof structures must be able to support the weight of the
unit and its options/accessories. Unit must be installed on a
solid, level roof curb or appropriate angle iron frame.
6.
Maintain level tolerance to 1/2” across the entire width and
length of unit.
Excessive exposure of this furnace to contaminated
combustion air may result in equipment damage or
personal injury. Typical contaminates include:
permanent wave solution, chlorinated waxes and
cleaners, chlorine based swimming pool chemicals,
water softening chemicals, carbon tetrachloride,
Halogen type refrigerants, cleaning solvents (e.g.
perchloroethylene), printing inks, paint removers,
varnishes, hydrochloric acid, cements and glues,
antistatic fabric softeners for clothes dryers, masonry
acid washing materials.
Clearances
All units require particular clearances for proper operation and
service. Installer must make provisions for adequate
combustion and ventilation air in accordance with section 5.3 of
Air for Combustion and Ventilation of the National Fuel Gas
Code, ANSI Z223.1 – Latest Edition (in U.S.A.), or Sections 7.2,
7.3, or 7.4 of Gas Installation Codes, CSA-B149.1 (in Canada) Latest Edition, and/or applicable provisions of the local building
Johnson Controls Unitary Products
Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet, combustion air
inlet or vent outlets.
Rigging And Handling
Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation. Rig the
unit by attaching chain or cable slings to the lifting holes
provided in the base rails. Spreader bars, whose length
exceeds the largest dimension across the unit, MUST be used
across the top of the unit.
If a unit is to be installed on a roof curb other than a UP
roof curb, gasketing must be applied to all surfaces that
come in contact with the unit underside.
Before lifting, make sure the unit weight is distributed
equally on the rigging cables so it will lift evenly.
Units may be moved or lifted with a forklift. Slotted openings in
the base rails are provided for this purpose.
LENGTH OF FORKS MUST BE A MINIMUM OF 42 INCHES.
All panels must be secured in place when the unit is
lifted.
The condenser coils should be protected from rigging
cable damage with plywood or other suitable material.
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C
D
B
A
A
B
Front
D
C
E
Front
F
Figure 2: Unit 4 Point Load Weight
Figure 3: Unit 6 Point Load Weight
Y
X
FRONT
LEFT
Figure 4: Center of Gravity
Table 2:
Weights and Dimensions
Weight (lbs.)
Center of Gravity
Size
(Tons) Shipping Operating
X
Y
T03
475
470
33
18.25
(3.0)
T04
544
539
31.5
18.5
(4.0)
T05
572
567
37
15
(5.0)
Table 3:
4 Point Load Location (lbs.)
A
B
C
D
A
6 Point Load Location (lbs.)
B
C
D
E
114
77
112
167
82
61
48
70
90
119
137
85
121
195
99
70
53
75
100
141
104
85
170
208
72
63
55
110
125
143
F
T03 thru 05ZF Unit Accessory Weights
Unit Accessory
Economizer
Power Exhaust
Electric Heat1
Gas Heat2
Weight (lbs.)
Shipping
Operating
55
50
55
50
28
28
70
70
1. Weight given is for the maximum heater size available (30KW).
2. Weight given is for the maximum number of tube heat exchangers
available (5 tube).
8
Johnson Controls Unitary Products
691696-UIM-A-0311
Figure 5: T03 thru 05ZF Cooling Only/Electric Heat Front View Physical Dimensions
Figure 6: T03 thru 05ZF Cooling Only/Gas Heat Front View Physical Dimensions
Johnson Controls Unitary Products
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691696-UIM-A-0311
27-1/2
1-5/8
27-1/2
19-3/4
19-1/2
44-7/8
Detail “A”
27-1/2
7-1/4
27-1/2
10-1/4
19-1/8
3-1/2
8-1/4
“A”
44-7/8
LH End View
Rear View
Dimension “A”
Fixed
Outdoor
12
Air Damper
Motorized
Damper
4-3/8
Detail “B”
16-1/2
Figure 7: T03 thru 05Z Fixed Outdoor Air Motorized Damper Rain Hood Physical Dimensions
Table 4:
T03 thru 05ZF Unit Clearances
Location
Front
Rear
Left Side (Filter Access)
Right Side (Cond. Coil)
Below Unit1
Above Unit2
Clearance
24” (Cooling/Electric Heat)
32” (Gas Heat)
12” (Less Economizer)
36” (With Economizer or Fixed
Air/Motorized Damper)
24” (Less Economizer)
36” (With Economizer)
24”
0”
72” (For
Condenser Air Discharge)
1. Units may be installed on combustible floors made from
wood or class A, B, or C roof covering material.
2. Units must be installed outdoors. Overhanging structures
or shrubs should not obstruct condenser air discharge
outlet.
10
Filter Access
Blower Motor Access
Dot Plugs
Field-Supplied Disconnect
Switch Location
Mounting Bracket for
Disconnect Switch
A,B
(Field Supplied)
Wiring Entry
(See Detail “B”)
Control Box Access
Disconnect Switch Location
and Motor Access Panel for
Unit with “Belt-Drive” Option
Figure 8: T03 thru 05ZF Disconnect Location
Johnson Controls Unitary Products
691696-UIM-A-0311
Figure 9: T03 thru 05ZF Unit Side Duct Openings
Table 5:
Hole
T03 thru 05ZF Utilities Entry
Opening Size (Dia.)
1
A
7/8” KO
B
2” KO1
C
D
1-5/8” KO
1-1/2” KO
Used For
Side
Bottom
Side
Power Wiring
Bottom
Gas Piping (Front)
Gas Piping (Bottom)
Control Wiring2
1. Opening in the bottom to the unit can be located by the slice in the
insulation.
2. Do not remove the 2” knockout ring.
Figure 10: T03 thru 05ZF Roof Curb
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Ductwork
Compressors
Ductwork should be designed and sized according to the
methods in Manual D of the Air Conditioning Contractors of
America (ACCA) or as recommended by any other recognized
authority such as ASHRAE or SMACNA.
The scroll compressor used in this product is specifically
designed to operate with R-410A Refrigerant and cannot be
interchanged.
A closed return duct system should be used. This will not
preclude use of economizers or outdoor fresh air intake. The
supply and return air duct connections at the unit should be
made with flexible joints to minimize noise.
The supply and return air duct systems should be designed for
the CFM and static pressure requirements of the job. They
should NOT be sized to match the dimensions of the duct
connections on the unit.
Refer to Figures 5 and 6 for bottom air duct openings. Refer to
Figure 9 for side air duct openings.
When fastening ductwork to side duct flanges on unit,
insert screws through duct flanges only. DO NOT insert
screws through casing. Outdoor ductwork must be
insulated and water-proofed.
NOTE: It is recommended that, in Canada, the outlet duct be
provided with a removable access panel. It is
recommended that this opening be accessible when
the unit is installed in service, and of a size such that
smoke or reflected light may be observed inside the
casing to indicate the presence of leaks in the heat
exchanger. The cover should be attached in a manner
adequate to prevent leakage.
Condensate Drain
Plumbing must conform to local codes. Use a sealing compound
on male pipe threads. Install a condensate drain line from the
3/4” NPT female connection on the unit to an open drain.
NOTE: The condensate drain operates in a negative pressure
in the cabinet. The condensate drain line MUST be
trapped to provide proper drainage. See Figure 11.
This system uses R-410A Refrigerant which operates at
higher pressures than R-22. No other refrigerant may be
used in this system.
The compressor also uses a polyolester (POE oil), Mobil 3MA
POE. This oil is extremely hygroscopic, meaning it absorbs
water readily. POE oil can absorb 15 times as much water as
other oils designed for HCFC and CFC refrigerants. Take all
necessary precautions to avoid exposure of the oil to the
atmosphere.
Do not leave the system open to the atmosphere. Unit
damage could occur due to moisture being absorbed by
the POE oil in the system. This type of oil is highly
susceptible to moisture absorption
POE (polyolester) compressor lubricants are known to cause
long term damage to some synthetic roofing materials.
Exposure, even if immediately cleaned up, may cause
embrittlement (leading to cracking) to occur in one year
or more. When performing any service that may risk
exposure of compressor oil to the roof, take precautions
to protect roofing.
Procedures which risk oil leakage include, but are not limited to,
compressor replacement, repairing refrigerant leaks, replacing
refrigerant components such as filter drier, pressure switch,
metering device or coil.
Units are shipped with compressor mountings which are
factory-adjusted and ready for operation.
Units with scroll compressors have a shipping bracket which
must be removed after the unit is set in place. See Figure 12.
Figure 11: Condensate Drain
12
Johnson Controls Unitary Products
691696-UIM-A-0311
Compressor
Mounting bracket
base
comply with electrical codes should not be required. If any of
the wire supplied with the unit must be replaced, replacement
wire must be of the type shown on the wiring diagram and the
same minimum gauge as the replaced wire.
A disconnect must be utilized for these units. If installing a
disconnect (field supplied or U.P. supplied accessory), refer to
Figure 8 for the recommended mounting location.
Remove these
screws (2)
Mounting bracket
top (remove)
Wire tie
(cut and remove)
Figure 12: Compressor Restraining Bracket
Do not loosen compressor mounting bolts.
Filters
One or two-inch filters can be supplied with each unit. One-inch
filters may be used with no modification to the filter racks. Filters
must always be installed ahead of evaporator coil and must be
kept clean or replaced with same size and type. Dirty filters
reduce the capacity of the unit and result in frosted coils or
safety shutdown. Refer to physical data tables, for the number
and size of filters needed for the unit. The unit should not be
operated without filters properly installed.
Make sure that panel latches are properly positioned on
the unit to maintain an airtight seal.
Power And Control Wiring
Field wiring to the unit, fuses, and disconnects must conform to
provisions of National Electrical Code (NEC), ANSI/NFPA No.
70 – Latest Edition (in U.S.A.), current Canadian Electrical
Code C221, and/or local ordinances. The unit must be
electrically grounded in accordance with NEC and CEC as
specified above and/or local codes.
Voltage tolerances which must be maintained at the
compressor terminals during starting and running conditions are
indicated on the unit Rating Plate and Table 1.
208/230-3-60 unit control transformers are factory wired
for 230v and power supply. Change tap on transformer
for 208-3-60 operation. See unit wiring diagram.
The internal wiring harnesses furnished with this unit are an
integral part of the design certified unit. Field alteration to
Johnson Controls Unitary Products
Avoid damage to internal components if drilling holes for
disconnect mounting.
NOTE: Since not all local codes allow the mounting of a
disconnect on the unit, please confirm compliance with
local code before mounting a disconnect on the unit.
Electrical line must be sized properly to carry the load. USE
COPPER CONDUCTORS ONLY. Each unit must be wired with
a separate branch circuit fed directly from the meter panel and
properly fused.
Refer to Figure 13 for typical field wiring and to the appropriate
unit wiring diagram mounted inside control doors for control
circuit and power wiring information.
When connecting electrical power and control wiring to
the unit, water-proof connectors must be used so that
water or moisture cannot be drawn into the unit during
normal operation. The above water-proofing conditions
will also apply when installing a field supplied disconnect
switch.
Power Wiring Detail
Units are factory wired for the voltage shown on the unit
nameplate. Refer to Electrical Data Table 7 to size power
wiring, fuses, and disconnect switch.
Power wiring is brought into the unit through the side of the unit
or the basepan inside the curb.
Thermostat Wiring
The thermostat should be located on an inside wall
approximately 56 inch above the floor where it will not be
subject to drafts, sun exposure or heat from electrical fixtures or
appliances. Follow the manufacturer's instructions enclosed
with thermostat for general installation procedure. Seven (7)
color-coded, insulated wires should be used to connect the
thermostat to the unit. Refer to Table 6 for control wire sizing
and maximum length.
Table 6:
Control Wire Sizes
Wire Size
Maximum Length1
18 AWG
150 Feet
1. From the unit to the thermostat and back to the unit.
13
691696-UIM-A-0311
TYPICAL POWER WIRING
REFER TO THE ELECTRICAL DATA
TABLES TO SIZE THE DISCONNECT
SWITCH, OVERCURRENT PROTECTION AND WIRING.
TYPICAL CONTROL WIRING
COOLING ONLY (24 VOLT THERMOSTAT)
THERMOSTAT
TERMINALS
1
RV
YC
COOLING / HEATING (24 VOLT THERMOSTAT)
THERMOSTAT 1
TERMINALS
UNIT TERMINAL
STRIP TB1
R
Y1
ADD
JUMPER
24 VOLT
TRANSFORMER
Y2
GF
UNIT TERMINAL
STRIP TB1
RC
R
Y
Y1
24 VOLT
TRANSFORMER
Y2
G
W
C
1
RH
W1
W2
24 VOLT THERMOSTAT 2TH07701024. TO CONTROL THE ECONOMIZER
ON SECOND STAGE COOLING, USE THE THERMOSTAT 2TH0401224.
G
G
C
1
24 VOLT THERMOSTAT 2ET07701024. TO CONTROL THE ECONOMIZER ON THE SECOND
STAGE COOLING OR TO HAVE AN ELECTRIC HEAT ACCESSORY WITH TWO STAGES OF
HEAT, USE THERMOSTAT 2TH0471024.
COOLING / HEATING (ELECTRONIC THERMOSTAT)
SINGLE STAGE
THERMOSTAT1
TERMINALS
RH
ADD
JUMPER
UNIT TERMINAL
STRIP TB1
RC
R
Y
Y1
W
W1
G
G
C
24 VOLT
TRANSFORMER
1 ELECTRONIC
PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE).
TO CONTROL THE ECONOMIZER ON SECOND STAGE COOLING, USE THERMOSTAT
2TH04700224.
Figure 13: Typical Field Power and Control Wiring
14
Johnson Controls Unitary Products
691696-UIM-A-0311
Table 7:
Electrical Data
T03 thru 05ZF (Belt Drive)
Size
(Tons)
T03
(3.0)
T04
(4.0)
T05
(5.0)
Volt
208-3-60
230-3-60
208-3-60
230-3-60
575-3-60
208-3-60
230-3-60
460-3-60
575-3-60
Compressors
(each)
OD Fan
Motors
(each)
Supply
Blower
Motor
RLA LRA
MCC
FLA
FLA
9.1
9.1
16.0
16.0
6.4
17.6
17.6
8.3
7.4
14.2
14.2
25.0
25.0
10.0
27.5
27.5
13.0
11.5
2.3
2.3
2.3
2.3
1.3
2.3
2.3
1.3
1.3
5.2
5.2
5.2
5.2
2.0
5.2
5.2
2.6
2.0
OD Fan
Motors
(each)
Supply
Blower
Motor
68.0
68.0
120.0
120.0
40.0
120.0
120.0
70.0
53.0
MCA1
(Amps)
18.9
18.9
27.5
27.5
11.0
29.5
29.5
14.3
12.3
Max
Fuse2/
Breaker3
Size
(Amps)
25
25
35
35
15
40
40
20
15
1. Minimum Circuit Ampacity.
2. Dual Element, Time Delay Type.
3. HACR type per NEC.
T03 thru 05ZF (Direct Drive)
Size
(Tons)
T03
(3.0)
T04
(4.0)
T05
(5.0)
Volt
208-3-60
230-3-60
208-3-60
230-3-60
208-1-60
230-1-60
208-3-60
230-3-60
Compressors
(each)
RLA LRA
MCC
FLA
FLA
9.1
9.1
16.0
16.0
26.2
26.2
17.6
17.6
14.2
14.2
25.0
25.0
41.0
41.0
27.5
27.5
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.3
6.0
6.0
7.6
7.6
7.6
7.6
7.6
7.6
68.0
68.0
120.0
120.0
150.0
150.0
120.0
120.0
MCA1
(Amps)
19.7
19.7
29.9
29.9
42.7
42.7
31.9
31.9
Max
Fuse2/
Breaker3
Size
(Amps)
25
25
40
40
60
60
40
40
1. Minimum Circuit Ampacity.
2. Dual Element, Time Delay Type.
3. HACR type per NEC.
Johnson Controls Unitary Products
15
691696-UIM-A-0311
Table 8:
Physical Data
T03 thru 05ZF Physical Data
Component
Models
T03ZF
T04ZF
T05ZF
3.0
4.0
5.0
Gross Capacity @ ARI A point (Btu)
38500
50500
59500
ARI net capacity (Btu)
36000
47500
57000
EER
11.0
11.0
10.8
SEER
13.0
13.0
13.0
IPLV
-
-
-
1200
1600
1750
Nominal Tonnage
ARI COOLING PERFORMANCE
Nominal CFM
System power (KW)
3.27
4.32
5.28
R-410A
R-410A
R-410A
4-14
4-4
4-15
Heating model
N08
N10
N08
N10
Heat input (K Btu)
100
125
100
125
Heat output (K Btu)
80
100
80
100
80.5
80.3
80.5
80.3
Refrigerant type
Refrigerant charge (lb-oz)
System 1
ARI HEATING PERFORMANCE
AFUE %
Steady state efficiency (%)
-
-
-
-
No. burners
4
5
4
5
No. stages
Temperature Rise Range (ºF)
1
1
1
1
45-75
45-75
25-55
35-75
Gas Limit Setting (ºF) - Direct Drive
170
165
170
165
Gas Limit Setting (ºF) - Belt Drive
210
210
210
210
Gas piping connecting (in.)
1/2
1/2
1/2
1/2
DIMENSIONS (inches)
Length
82 1/4
82 1/4
82 1/4
Width
44 7/8
44 7/8
44 7/8
32 5/8
32 5/8
32 5/8
470
539
567
Recip
Scroll
Scroll
1
1
1
100
100
100
16.3
Height
OPERATING WT. (lbs.)
COMPRESSORS
Type
Quantity
Unit Capacity Steps (%)
CONDENSER COIL DATA
Face area (Sq. Ft.)
16.3
16.3
Rows
1
1
1
Fins per inch
23
23
23
Tube diameter (in.)
Circuitry Type
0.71 / 18
0.71 / 18
0.71 / 18
2-pass Microchannel
2-pass Microchannel
2-pass Microchannel
5.06
EVAPORATOR COIL DATA
Face area (Sq. Ft.)
5.06
5.06
Rows
3
3
4
Fins per inch
13
13
13
Tube diameter
0.375
0.375
0.375
Circuitry Type
Intertwined
Intertwined
Intertwined
TXV
TXV
Orifice
Refrigerant control
16
Johnson Controls Unitary Products
691696-UIM-A-0311
T03 thru 05ZF Physical Data (Continued)
Models
Component
Nominal Tonnage
T03ZF
T04ZF
T05ZF
3.0
4.0
5.0
1
1
1
CONDENSER FAN DATA
Quantity
Fan diameter (Inch)
Type
Drive type
Quantity of motors
Motor HP each
No. speeds
24
24
24
Prop
Prop
Prop
Direct Drive
Direct Drive
Direct Drive
1
1
1
1/2
1/2
1/2
1
1
1
RPM
1090
1090
1090
Nominal total CFM
4200
4200
4200
BELT DRIVE EVAP FAN DATA
Quantity
Fan Size (Inch)
Type
1
1
1
12 x 10
12 x 10
12 x 10
Centrifugal
Centrifugal
Centrifugal
Motor Sheave
1VL44
1VL44
1VL44
Blower Sheave
AK64
AK56
AK56
Belt
A37
A36
A36
Motor HP each
1-1/2
1-1/2
1-1/2
RPM
1725
1725
1725
56
56
56
Frame size
DIRECT DRIVE EVAP FAN DATA
Quantity
1
1
1
12 x 10
12 x 10
12 x 10
Centrifugal
Centrifugal
Centrifugal
1/2
1
1
1050
1050
1050
15” x 20” x 1” or 2”
2
2
2
14” x 25” x 1” or 2”
1
1
1
Fan Size (Inch)
Type
Motor HP each
RPM
FILTERS
Optional Gas Heat
These gas-fired heaters have aluminized-steel tubular heat
exchangers with spark ignition with proven pilot.
Table 9:
For natural gas heating installations in locations requiring low
Nox emissions, Accessory model 1LN0406 must be used.
Gas Heat Application Data
Gas Heat
Option
N08
N10
All gas heaters are shipped from the factory equipped for
natural gas use. See Gas Heat Application Data Table.
Input
Capacity
(MBH)
100
125
Output
Capacity
(MBH)
80
100
Available
On Models
Gas Rate1
(Ft3/hr)
3/5 TON
4/5 TON
93
116
Temperature Rise °F At Full Input2
Min.
Max.
45/25
45/35
75/55
75/75
NOTE: Gas Heaters are shipped available for natural gas, but can be converted to L.P. with Kit Model No. 1NP0440. All furnaces meet the
latest California seasonal efficiency requirements.
1. Based on 1075 Btu/Ft.3.
2. The air flow must be adjusted to obtain a temperature rise within the range shown.
Johnson Controls Unitary Products
17
691696-UIM-A-0311
Gas Piping
Proper sizing of gas piping depends on the cubic feet per hour
of gas flow required, specific gravity of the gas and the length of
run. “National Fuel Gas Code” Z223.1 (in U.S.A.) or the current
Gas Installation Codes CSA-B149.1 (in Canada) should be
followed in all cases unless superseded by local codes or gas
utility requirements. Refer to the Pipe Sizing Table 10. The
heating value of the gas may differ with locality. The value
should be checked with the local gas utility.
NOTE: Maximum capacity of pipe in cubic feet of gas per hour
based upon a pressure drop of 0.3 inch W.C. and 0.6
specific gravity gas.
NOTE: There may be a local gas utility requirement specifying a
minimum diameter for gas piping. All units require a 1/2
inch pipe connection at the entrance fitting. Line should
not be sized smaller than the entrance fitting size.
Gas Connection
The gas supply line can be routed within the space and roof
curb, exiting through the unit’s basepan. Refer to Figure 6 for
the gas piping inlet locations. Typical supply piping
arrangements are shown in Figures 14 and 15. All pipe nipples,
fittings, and the gas cock are field supplied or may be
purchased in UP accessory kit #1GP0401.
Gas piping recommendations:
1.
A drip leg and a ground joint union must be installed in the
gas piping.
2.
Where required by local codes, a manual shut-off valve
must be installed outside of the unit.
3.
Use wrought iron or steel pipe for all gas lines. Pipe dope
should be applied sparingly to male threads only.
Figure 14: Side Entry Gas Piping
Natural gas may contain some propane. Propane is an
excellent solvent and will quickly dissolve white lead and
most standard commercial compounds. A special pipe
dope must be used when assembling wrought iron or
steel pipe. Shellac based compounds such as Gaskolac
or Stalastic, and compounds such as Rectorseal #5,
Clydes’s or John Crane may be used.
Figure 15: Bottom Entry Gas Piping
4.
All piping should be cleaned of dirt and scale by
hammering on the outside of the pipe and blowing out
loose particles. Before initial start-up, be sure that all gas
lines external to the unit have been purged of air.
5.
The gas supply should be a separate line and installed in
accordance with all safety codes as prescribed under
“Limitations”.
6.
A 1/8-inch NPT plugged tapping, accessible for test gage
connection, must be installed immediately upstream of the
gas supply connection to the unit.
7.
After the gas connections have been completed, open the
main shut-off valve admitting normal gas pressure to the
mains. Check all joints for leaks with soap solution or other
material suitable for the purpose. NEVER USE A FLAME.
Table 10: Gas Pipe Sizing - Capacity of Pipe
Length of
Pipe (ft.)
10
20
30
40
50
60
70
80
90
100
18
3/4 in.
278
190
152
130
115
105
96
90
84
79
Nominal Iron Pipe Size
1 in.
1-1/4 in.
520
1050
350
730
285
590
245
500
215
440
195
400
180
370
170
350
160
320
150
305
Johnson Controls Unitary Products
691696-UIM-A-0311
3.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
The furnace and its individual shut-off valve must be
disconnected from the gas supply piping system during
any pressure testing at pressures in excess of 1/2 PSIG.
Pressures greater than 1/2 PSIG will cause gas valve
damage resulting in a hazardous condition. If it is
subjected to a pressure greater than 1/2 PSIG, the gas
valve must be replaced.
The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 PSIG.
Threaded joints should be coated with a sealing
compound that is resistant to the action of liquefied
petroleum gases. Do not use Teflon tape.
LP Units, Tanks And Piping
All gas heat units are shipped from the factory equipped for
natural gas use only. The unit may be converted in the field for
use with LP gas with accessory kit model number 1NP0440.
All LP gas equipment must conform to the safety standards of
the National Fire Protection Association.
For satisfactory operation, adequate LP gas pressure must be
provided at the unit manifold under full load. Maintaining proper
gas pressure depends on three main factors:
1.
The vaporization rate which depends on the temperature of
the liquid and the “wetted surface” area of the container(s).
2.
The proper pressure regulation. (Two-stage regulation is
recommended).
Johnson Controls Unitary Products
The pressure drop in the lines between regulators and
between the second stage regulator and the appliance.
Pipe size required will depend on the length of the pipe run
and the total load of all appliances.
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and LP gas suppliers.
LP gas is an excellent solvent and will quickly dissolve
white lead and most standard commercial compounds. A
special pipe dope must be used when assembling
wrought iron or steel pipe for LP. Shellac base compounds
such as Gaskolac or Stalastic, and compounds such as
Rectorseal #5, Clyde’s, or John Crane may be used.
Check all connections for leaks when piping is completed using
a soap solution. NEVER USE A FLAME.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
Vent And Combustion Air Hoods
The vent hood and combustion air hood (with screens) are
shipped attached to the blower housing in the blower
compartment. These hoods must be installed to assure proper
unit function. All hoods must be fastened to the outside of the
gas heat access panel with the screws provided in the bag also
attached to the blower housing.
The screen for the combustion air intake hood is secured to the
inside of the access panel opening with three fasteners and the
screws used for mounting the hood to the panel. The top flange of
this hood slips in under the top of the access panel opening when
installing. Refer to Vent and Combustion Air Hood Figure 16.
The vent hood is installed by inserting the top flange of the hood
into the slotted opening in the access panel and securing in place.
The products of combustion are discharged horizontally through
this screened, hooded vent opening on the gas heat access panel.
19
691696-UIM-A-0311
Span Length
Defl Force
(B)
*Never Loosen
Figure 16: Vent And Combustion Air Hood
(A)
(C)*
Figure 17: Belt Adjustment
An adhesive backed label is provided over the outside of
the combustion air inlet opening to prevent moisture
from entering the unit, which could cause damage to
electrical components. Allow this closure label to remain
in place until the combustion air hood is to be installed.
Phasing
T**ZF units are properly phased at the factory. Check for proper
compressor rotation. If the blower or compressors rotate in the
wrong direction at start-up, the electrical connection to the unit
is misphased. Change the phasing of the Field Line
Connection at the factory or field supplied disconnect to
obtain proper rotation. (Scroll compressors operate in only one
direction. If the scroll is drawing low amperage, has similar
suction and discharge pressures, or producing a high noise
level, the scroll is misphased.)
Scroll compressors require proper rotation to operate
correctly. Units are properly phased at the factory. Do
not change the internal wiring to make the blower
condenser fans, or compressor rotate correctly.
Blower Rotation
Check for proper supply air blower rotation. If the blower is
rotating backwards, the line voltage at the unit point of power
connection is misphased (See ‘PHASING’).
Belt Tension
The tension on the belt should be adjusted as shown in Figure 17.
20
Procedure for adjusting belt tension:
1. Loosen six nuts (top and bottom) A.
2. Adjust by turning (B).
3. Never loosen nuts (C).
4. Use belt tension checker to apply a perpendicular
force to one belt at the midpoint of the span as shown.
Deflection distance of 4mm (5/32”) is obtained.
To determine the deflection distance from normal position,
use a straight edge from sheave to sheave as reference
line. The recommended deflection force is as follows:
Tension new belts at the max. deflection force
recommended for the belt section. Check the belt
tension at least two times during the first 24 hours of
operation. Any retensioning should fall between the min.
and max. deflection force values.
5. After adjusting retighten nuts (A).
CFM Static Pressure and Power-Altitude and Temperature
Corrections
The information below should be used to assist in application of
product when being applied at altitudes at or exceeding 1000
feet above sea level.
The air flow rates listed in the standard blower performance
tables are based on standard air at sea level. As the altitude or
temperature increases, the density of air decreases. In order to
use the indoor blower tables for high altitude applications,
certain corrections are necessary.
A centrifugal fan is a “constant volume” device. This means
that, if the rpm remains constant, the CFM delivered is the
same regardless of the density of the air. However, since the air
at high altitude is less dense, less static pressure will be
generated and less power will be required than a similar
application at sea level. Air density correction factors are shown
in Table 11 and Figure 18.
Johnson Controls Unitary Products
691696-UIM-A-0311
Table 11: Altitude/Temperature Correction Factors
Air
Temp.
40
50
60
70
80
90
100
0
1.060
1.039
1.019
1.000
0.982
0.964
0.946
1000
1.022
1.002
0.982
0.964
0.947
0.929
0.912
2000
0.986
0.966
0.948
0.930
0.913
0.897
0.880
3000
0.950
0.931
0.913
0.896
0.880
0.864
0.848
4000
0.916
0.898
0.880
0.864
0.848
0.833
0.817
Altitude (Ft.)
5000
0.882
0.864
0.848
0.832
0.817
0.802
0.787
6000
0.849
0.832
0.816
0.801
0.787
0.772
0.758
7000
0.818
0.802
0.787
0.772
0.758
0.744
0.730
8000
0.788
0.772
0.757
0.743
0.730
0.716
0.703
9000
0.758
0.743
0.729
0.715
0.702
0.689
0.676
10000
0.729
0.715
0.701
0.688
0.676
0.663
0.651
1.100
1.050
Correction Factor
1.000
Sea Level
0.950
1000 ft
0.900
2000 ft
0.850
3000 ft
0.800
5000 ft
0.750
6000 ft
7000 ft
4000 ft
8000 ft
0.700
9000 ft
10000 ft
0.650
0.600
40
50
60
70
80
90
100
Air Temperature (ºF)
Figure 18: Altitude/Temperature Correction Factors
The examples below will assist in determining the airflow
performance of the product at altitude.
blower tables to select the blower speed and the BHP
requirement.
Example 1: What are the corrected CFM, static pressure, and
BHP at an elevation of 5,000 ft. if the blower performance data
is 1,400 CFM, 0.6 IWC and 0.67 BHP?
Solution: As in the example above, no temperature
information is given so 70°F is assumed.
Solution: At an elevation of 5,000 ft. the indoor blower will still
deliver 1,400 CFM if the rpm is unchanged. However, Table 12
must be used to determine the static pressure and BHP. Since
no temperature data is given, we will assume an air temperature
of 70°F. Table 11 shows the correction factor to be 0.832.
Corrected static pressure = 0.6 x 0.832 = 0.499 IWC
Corrected BHP = 0.67 x 0.832 = 0.56
Example 2: A system, located at 5,000 feet of elevation, is to
deliver 1,400 CFM at a static pressure of 1.5". Use the unit
Johnson Controls Unitary Products
The 1.5" static pressure given is at an elevation of 5,000 ft. The
first step is to convert this static pressure to equivalent sea level
conditions.
Sea level static pressure = 0.6 / .832 = 0.72"
Enter the blower table at 1,400 sCFM and static pressure of
0.72". The rpm listed will be the same rpm needed at 5,000 ft.
Suppose that the corresponding BHP listed in the table is 0.7.
This value must be corrected for elevation.
BHP at 5,000 ft. = 0.7 x .832 = 0.58
21
691696-UIM-A-0311
Drive Selection
1.
Determine side or bottom supply air duct application.
2.
Determine desired airflow.
3.
Calculate or measure the amount of external static pressure.
4.
Using the operating point determined from steps 1, 2 & 3, locate this point on the appropriate supply air blower performance table. (Linear
interpolation may be necessary.)
5.
Noting the RPM and BHP from step 4, locate the appropriate motor and/or drive on the RPM selection table.
6.
Review the BHP compared to the motor options available. Select the appropriate motor and/or drive.
7.
Review the RPM range for the motor options available. Select the appropriate drive if multiple drives are available for the chosen motor.
8.
Determine turns open to obtain the desired operation point.
Example
1.
2200 CFM
2.
1.6 iwg
3.
Using the supply air blower performance table below, the following data point was located: 1478 RPM & 1.82 BHP.
4.
Using the RPM selection table below, Size X and Model Y is found.
5.
1.82 BHP exceeds the maximum continuous BHP rating of the 1.5 HP motor. The 2 HP motor is required.
6.
1478 RPM is within the range of the 2 HP drive.
7.
Using the 2 HP motor and drive, 2.5 turns open will achieve 1478 RPM.
Example Supply Air Blower Performance
Air Flow
(CFM)
2000
2200
2400
2600
Available External Static Pressure - IWG
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Supplied
Drive
907
1.00
960
1.24
1015 1.51
1074 1.83
Standard Drive Option
990
1043
1099
1157
1.07
1.31
1.59
1.90
1070
1123
1178
1237
1.15
1.39
1.66
1.98
1146
1199
1255
1314
1.23
1.47
1.74
2.06
HIgh Static Drive Option
1220
1273
1329
1387
1.31
1.55
1.83
2.14
1291
1344
1400
1458
1.40
1.64
1.92
2.23
1359
1412
1468
-
1.49
1.73
2.01
-
1425
1478
1534
-
1.58
1.82
2.10
-
1488
1541
1597
-
1.68
1.92
2.19
-
1550
1602
1658
-
1.77
2.01
2.29
-
Table X: RPM Selection
Size
(Tons)
Model
HP
Max
BHP
Motor
Sheave
Blower
Sheave
5 Turns
Open
4 Turns
Open
3 Turns
Open
2 Turns
Open
1 Turn
Open
Fully
Closed
X
Y
1.5
2
1.73
2.3
1VL44
1VP56
AK56
AK56
930
1325
995
1395
1060
1460
1130
1525
1195
1590
1260
1660
22
Johnson Controls Unitary Products
691696-UIM-A-0311
Table 12: T**ZF Blower Performance Side Duct
T03ZF (3 Ton Belt Drive) Side Duct
Air Flow
(CFM)
800
1000
1200
1400
1600
1.
2.
3.
4.
Available External Static Pressure - IWG1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Supplied Drive
634
0.34
735
0.39
659
0.39
760
0.45
685
0.47
786
0.52
716
0.57
816
0.62
752
0.69
852
0.75
828
853
879
909
945
0.45
0.51
0.58
0.68
0.81
Standard Drive Option
914
0.52
995
0.59
939
0.57 1019 0.65
965
0.65 1045 0.72
995
0.75 1076 0.82
1032 0.88 1112 0.95
1070
1094
1120
1151
1187
0.67
0.72
0.80
0.90
1.03
1140
1165
1191
1221
1258
0.75
0.80
0.88
0.98
1.11
HIgh Static Drive Option
1207 0.83 1270 0.92
1232 0.89 1295 0.97
1258 0.96 1321 1.05
1288 1.06 1352 1.15
1324 1.19 1388 1.27
1332 1.00
1356 1.06
1382 1.13
1413 1.23
1449 1.36
FS4
Blower performance includes gas heat exchangers and 1” filters. See STATIC RESISTANCE table for additional applications.
See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.
kW = BHP x 0.932.
Field Supplied Drive.
T04ZF (4 Ton Belt Drive) Side Duct
Air Flow
(CFM)
1000
1200
1400
1600
1800
2000
1.
2.
3.
4.
Available External Static Pressure - IWG1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
703
733
770
811
857
907
Field Supplied Drive
0.39
786
0.47
866
0.44
817
0.52
896
0.52
853
0.60
933
0.64
895
0.71
974
0.80
940
0.87 1020
1.00
990
1.07 1070
0.54
0.60
0.67
0.79
0.95
1.15
942
973
1010
1051
1097
1146
0.62
0.68
0.76
0.87
1.03
1.23
1016
1047
1083
1125
1171
1220
Standard Drive Option
0.71 1087 0.79 1155
0.76 1118 0.85 1186
0.84 1154 0.93 1222
0.96 1196 1.04 1264
1.11 1242 1.20 1310
1.31 1291 1.40 1359
0.88
0.94
1.02
1.13
1.29
1.49
1221
1252
1288
1330
1375
1425
0.98
1.03
1.11
1.23
1.38
1.58
HIgh Static Drive Option
1284 1.07 1345 1.17
1315 1.12 1376 1.22
1352 1.20 1413 1.30
1393 1.32 1454 1.42
1439 1.48 1500 1.58
1488 1.68 1550 1.77
FS4
Blower performance includes gas heat exchangers and 1” filters. See STATIC RESISTANCE table for additional applications.
See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.
kW = BHP x 0.932.
Field Supplied Drive.
T05ZF (5 Ton Belt Drive) Side Duct
Air Flow
(CFM)
1200
1400
1600
1800
2000
2200
2400
2600
Available External Static Pressure - IWG1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
733
770
811
857
907
960
1015
1074
Field Supplied Drive
0.44
817
0.52
896
0.52
853
0.60
933
0.64
895
0.71
974
0.80
940
0.87 1020
1.00
990
1.07 1070
1.24 1043 1.31 1123
1.51 1099 1.59 1178
1.83 1157 1.90 1237
0.60
0.67
0.79
0.95
1.15
1.39
1.66
1.98
973
1010
1051
1097
1146
1199
1255
1314
0.68
0.76
0.87
1.03
1.23
1.47
1.74
2.06
Standard Drive Option
1047 0.76 1118 0.85
1083 0.84 1154 0.93
1125 0.96 1196 1.04
1171 1.11 1242 1.20
1220 1.31 1291 1.40
1273 1.55 1344 1.64
1329 1.83 1400 1.92
1387 2.14 1458 2.23
1186
1222
1264
1310
1359
1412
1468
-
0.94
1.02
1.13
1.29
1.49
1.73
2.01
-
1252
1288
1330
1375
1425
1478
1534
-
HIgh Static Drive Option
1.03 1315 1.12 1376
1.11 1352 1.20 1413
1.23 1393 1.32 1454
1.38 1439 1.48 1500
1.58 1488 1.68 1550
1.82 1541 1.92 1602
2.10 1597 2.19 1658
-
1.22
1.30
1.42
1.58
1.77
2.01
2.29
-
1. Blower performance includes gas heat exchangers and 1” filters. See STATIC RESISTANCE table for additional applications.
2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.
3. kW = BHP x 0.932.
Johnson Controls Unitary Products
23
691696-UIM-A-0311
T03 - 05ZF (3-5 Ton Direct Drive) Side Duct
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
1.0
CFM
0.9
WATTS
53
AVAILABLE EXTERNAL STATIC PRESSURE - IWG2
0.5
0.6
0.7
0.8
CFM
43
5 (HI)
4 (MED/HI)
3 (MED)
2 (MED/LOW)
1 (LOW)
5 (HI)
4 (MED/HI)
3 (MED)
2 (MED/LOW)
1 (LOW)
5 (HI)
4 (MED/HI)
3 (MED)
2 (MED/LOW)
1 (LOW)
0.4
WATTS
33
MOTOR1
SPEED
0.3
CFM
UNIT
TONNAGE
0.2
1574
1480
1332
1227
1075
1913
1722
1621
1332
2245
2135
2010
1748
1562
320
263
208
171
130
539
408
362
223
883
771
637
413
327
1530
1433
1286
1178
992
2067
1877
1682
1580
1290
2247
2116
1989
1704
1529
335
276
221
183
134
696
557
426
380
237
931
784
656
432
339
1488
1389
1241
1129
930
2027
1839
1634
1532
1232
2236
2108
1975
1669
1491
349
290
234
195
145
714
571
438
391
247
950
808
675
451
356
1451
1347
1195
1076
858
1991
1798
1597
1502
2211
2078
1938
1631
-
363
303
246
207
158
734
585
455
406
964
826
696
468
-
1411
1303
1146
1021
1953
1764
1554
1461
2171
2041
1900
1589
-
376
316
258
220
749
602
472
423
979
844
715
479
-
1374
1257
1097
953
1910
1721
1506
1411
2114
2004
1867
1551
-
390
329
272
235
764
619
490
440
971
859
730
497
-
1331
1208
1031
891
1860
1677
1450
1359
2034
1955
1822
1513
-
403
343
288
248
769
638
505
455
940
861
740
513
-
1292
1153
962
1770
1621
1404
1324
1948
1886
1784
1465
-
417
358
303
743
653
521
469
898
843
756
523
-
1249
1080
919
1621
1545
1370
1278
1855
1792
1716
-
430
374
313
685
639
536
485
854
806
748
-
1. Factory set on medium speed tap.
2. Includes allowances for a wet evaporator coil, 1” filters, and the heat exchangers. Refer to STATIC RESISTANCES Table for resistance
values.
3. Side Duct application (230 Volts)
24
Johnson Controls Unitary Products
691696-UIM-A-0311
Table 13: T**ZF Blower Performance Bottom Duct
T03ZF (3 Ton Belt Drive) Bottom Duct
Air Flow
(CFM)
800
1000
1200
1400
1600
Available External Static Pressure - IWG1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Supplied Drive
613
0.35
724
0.40
640
0.40
751
0.46
669
0.48
779
0.53
702
0.57
812
0.63
741
0.70
852
0.75
826
853
881
914
954
0.46
0.52
0.59
0.69
0.81
Standard Drive Option
920
0.53 1007 0.60
947
0.58 1034 0.65
975
0.65 1063 0.73
1009 0.75 1096 0.82
1048 0.88 1135 0.95
1089
1116
1144
1177
1217
0.67
0.73
0.80
0.90
1.02
1165
1192
1220
1254
1293
0.75
0.80
0.88
0.98
1.10
HIgh Static Drive Option
1237 0.83 1306 0.91 1372 1.00
1264 0.89 1333 0.97 1399 1.05
1293 0.96 1361 1.04 1427 1.13
1326 1.06 1394 1.14 1460 1.22
1365 1.18 1434 1.26 1500 1.35
Field Supplied Drive
1. Blower performance includes gas heat exchangers and 1” filters. See STATIC RESISTANCE table for additional applications.
2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.
3. kW = BHP x 0.932.
T04ZF (4 Ton Belt Drive) Bottom Duct
Air Flow
(CFM)
1000
1200
1400
1600
1800
2000
Available External Static Pressure - IWG1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
688
722
761
807
856
910
Field Supplied Drive
0.40
779
0.47
866
0.45
812
0.53
899
0.53
852
0.60
939
0.65
897
0.72
984
0.80
947
0.87 1034
0.99 1001 1.06 1088
0.55
0.60
0.68
0.79
0.95
1.14
949
983
1022
1068
1118
1172
0.63
0.68
0.76
0.87
1.02
1.22
1029
1063
1103
1148
1198
1252
Standard Drive Option
0.71 1107 0.80 1181
0.76 1140 0.85 1215
0.84 1180 0.92 1254
0.95 1225 1.04 1300
1.11 1275 1.19 1349
1.30 1329 1.39 1403
0.88
0.93
1.01
1.13
1.28
1.47
1253
1286
1326
1371
1421
1475
0.97
1.03
1.10
1.22
1.37
1.56
HIgh Static Drive Option
1322 1.07 1388 1.16
1355 1.12 1422 1.21
1395 1.20 1462 1.29
1440 1.31 1507 1.40
1490 1.46 1557 1.56
1544 1.66 1611 1.75
Field Supplied Drive
1. Blower performance includes gas heat exchangers and 1” filters. See STATIC RESISTANCE table for additional applications.
2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.
3. kW = BHP x 0.932.
T05ZF (5 Ton Belt Drive) Bottom Duct
Air Flow
(CFM)
1200
1400
1600
1800
2000
2200
2400
2600
Available External Static Pressure - IWG1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
722
761
807
856
910
968
1029
1093
Field Supplied Drive
0.45
812
0.53
899
0.53
852
0.60
939
0.65
897
0.72
984
0.80
947
0.87 1034
0.99 1001 1.06 1088
1.23 1059 1.30 1146
1.50 1119 1.57 1206
1.81 1183 1.88 1270
0.60
0.68
0.79
0.95
1.14
1.37
1.65
1.95
983
1022
1068
1118
1172
1229
1290
1354
0.68
0.76
0.87
1.02
1.22
1.45
1.72
2.03
Standard Drive Option
1063 0.76 1140 0.85
1103 0.84 1180 0.92
1148 0.95 1225 1.04
1198 1.11 1275 1.19
1252 1.30 1329 1.39
1309 1.53 1387 1.62
1370 1.81 1448 1.89
1434 2.11 1511 2.20
1215
1254
1300
1349
1403
1461
1522
1586
0.93
1.01
1.13
1.28
1.47
1.71
1.98
2.29
1286
1326
1371
1421
1475
1533
1593
-
HIgh Static Drive Option
1.03 1355 1.12 1422 1.21
1.10 1395 1.20 1462 1.29
1.22 1440 1.31 1507 1.40
1.37 1490 1.46 1557 1.56
1.56 1544 1.66 1611 1.75
1.80 1602 1.89 1668 1.99
2.07 1663 2.16 1729 2.26
Field Supplied Drive
1. Blower performance includes gas heat exchangers and 1” filters. See STATIC RESISTANCE table for additional applications.
2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.
3. kW = BHP x 0.932.
Johnson Controls Unitary Products
25
691696-UIM-A-0311
T03 - 05ZF (3-5 Ton Direct Drive) Bottom Duct
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
CFM
WATTS
1.0
WATTS
53
0.9
CFM
43
5 (HI)
4 (MED/HI)
3 (MED)
2 (MED/LOW)
1 (LOW)
5 (HI)
4 (MED/HI)
3 (MED)
2 (MED/LOW)
1 (LOW)
5 (HI)
4 (MED/HI)
3 (MED)
2 (MED/LOW)
1 (LOW)
AVAILABLE EXTERNAL STATIC PRESSURE - IWG2
0.5
0.6
0.7
0.8
0.4
WATTS
33
MOTOR1
SPEED
0.3
CFM
UNIT
TONNAGE
0.2
1520
1430
1287
1185
1040
1846
1662
1566
1287
2166
2060
1940
1688
1509
320
263
208
171
130
539
408
362
223
883
771
637
413
327
1478
1384
1242
1138
959
1995
1812
1624
1526
1246
2169
2042
1920
1645
1477
335
276
221
183
134
696
557
426
380
237
931
784
656
432
339
1438
1342
1199
1091
900
1957
1776
1577
1480
1190
2158
2035
1907
1611
-
349
290
234
195
145
714
571
438
391
247
950
808
675
451
-
1401
1302
1155
1041
1922
1736
1542
1450
2134
2006
1870
1575
-
363
303
246
207
734
585
455
406
964
826
696
468
-
1363
1259
1108
987
1885
1704
1501
1411
2095
1970
1834
1534
-
376
316
258
220
749
602
472
423
979
844
715
479
-
1327
1215
1060
921
1844
1662
1454
1363
2040
1934
1802
1498
-
390
329
272
235
764
619
490
440
971
859
730
497
-
1286
1168
997
862
1795
1619
1400
1312
1963
1888
1759
1461
-
403
343
288
248
769
638
505
455
940
861
740
513
-
1248
1114
930
1709
1566
1356
1279
1881
1821
1722
-
417
358
303
743
653
521
469
898
843
756
-
1207
1044
889
1566
1492
1323
1235
1791
1730
1657
-
430
374
313
685
639
536
485
854
806
748
-
1. Factory set on medium speed tap.
2. Includes allowances for a wet evaporator coil, 1” filters, and the heat exchangers. Refer to STATIC RESISTANCES Table for resistance
values.
3. Bottom Duct application (230 Volts)
Table 14: Belt Drive RPM Selection
Size
(Tons)
T03
(3.0)
T04
(4.0)
T05
(5.0)
Model
HP
Max
BHP
Motor
Sheave
Blower
Sheave
5 Turns
Open
4 Turns
Open
3 Turns
Open
2 Turns
Open
1 Turn
Open
Fully
Closed
ZF
1.5
1.73
1VL44
AK64
805
865
920
980
1035
1095
ZF
1.5
1.73
1VL44
AK56
930
995
1060
1130
1195
1260
ZF
1.5
1.73
1VL44
AK56
930
995
1060
1130
1195
1260
* Field Option Sheave.
Table 15: Indoor Blower Specifications (Belt Drive)
Size
(Tons)
T03
(3.0)
T04
(4.0)
T05
(5.0)
26
Motor
Motor Sheave
Blower Sheave
Datum Dia.
Datum Dia.
Bore (in.) Model
Bore (in.) Model
(in.)
(in.)
Belt
HP
RPM
Eff.
SF
Frame
1-1/2
1725
0.8
1.15
56
2.8 - 3.8
7/8
1VL44
6.0
1
AK64
A37
1-1/2
1725
0.8
1.15
56
2.8 - 3.8
7/8
1VL44
5.2
1
AK56
A36
1-1/2
1725
0.8
1.15
56
2.8 - 3.8
7/8
1VL44
5.2
1
AK56
A36
Johnson Controls Unitary Products
691696-UIM-A-0311
Checking Supply Air CFM
The RPM of the supply air blower will depend on the required
CFM, the unit accessories or options and the static resistances
of both the supply and the return air duct systems. With this
information, the motor speed tap (direct drive) or the motor
pulley number of turns open (belt drive) can be determined from
the Blower Performance Data Tables.
drop across a wet coil under field conditions would be
inaccurate. To assure a dry coil, the compressors should
be deactivated while the test is being run.
4.
Knowing the pressure drop across a dry coil, the actual
CFM through the unit can be determined from the curve in
Pressure Drop vs. Supply Air CFM (Figure 19).
Note the following:
The supply air CFM must be within the limitations shown in
the Unit Physical Data Table .
2.
Pulleys can be adjusted in half turn increments.
3.
The tension on the belt should be adjusted as shown in the
Belt Adjustment Figure 17.
4.
Tighten blower pulley and motor sheave set screws after
any adjustments. Re-check set screws after 10-12 hrs run
time is recommended.
Start the supply air blower motor. Adjust the resistances in both
the supply and the return air duct systems to balance the air
distribution throughout the conditioned space. The job
specifications may require that this balancing be done by
someone other than the equipment installer.
To check the supply air CFM after the initial balancing has been
completed:
1.
Remove the two 5/16” dot plugs from the blower motor and
the filter access panels shown in Figure 8.
2.
Insert at least 8" of 1/4 inch tubing into each of these holes
for sufficient penetration into the air flow on both sides of
the indoor coil.
NOTE: The tubes must be inserted and held in a position
perpendicular to the air flow so that velocity pressure
will not affect the static pressure readings.
3.
Using an inclined manometer, determine the pressure drop
across a dry evaporator coil. Since the moisture on an
evaporator coil may vary greatly, measuring the pressure
Failure to properly adjust the total system air quantity and
static pressure can result in extensive system damage.
After readings have been obtained, remove the tubes and
reinstall the two 5/16” dot plugs that were removed in Step 1.
NOTE: De-energize the compressors before taking any test
measurements to assure a dry indoor coil.
0.9
T05
0.8
PRESSURE DROP (IWG)
1.
0.7
0.6
T03
T04
0.5
0.4
0.3
0.2
0.1
0
0
500
1000
1500
2000
2500
3000
3500
NOMINAL CFM
Figure 19: Pressure Drop Across Coil
Table 16: Additional Static Resistance
Size
(Tons)
CFM
Cooling Only1
Economizer2 3
T03 (3.0)
T04 (4.0)
T05 (5.0)
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.23
0.26
0.29
0.32
0.07
0.08
0.09
0.11
0.13
0.15
0.17
0.20
0.23
0.26
0.30
1. Add these values to the available static resistance in the respective Blower Performance Tables.
2. Deduct these values from the available external static pressure shown in the respective Blower Performance Tables.
3. The pressure drop through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct
is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.
Johnson Controls Unitary Products
27
691696-UIM-A-0311
Operation
High-Pressure Limit Switch
Cooling Sequence Of Operation
During cooling operation, if a high-pressure limit switch opens,
the UCB will de-energize the compressor, initiate the ASCD
(Anti-short cycle delay), and stop the condenser fan. If the call
for cooling is still present at the conclusion of the ASCD, the
UCB will re-energize the compressor.
For the T**ZF series of units, the thermostat makes a circuit
between “R” and “Y1” for the first stage of cooling.
The call is passed to the Unit Control Board (UCB), which
then determines whether the requested operation is available
and, if so, which components to energize.
For gas heating, the UCB monitors the "W1" call but does not
handle the operation of the gas furnace. An ignition control
board controls the gas heater operation. For electric heat units,
the UCB passes the call to the electric heater. In both cases,
when the "W1" call is sensed, the indoor air blower is energized
following a specified heating delay.
If at any time a call for both heating and cooling are present, the
heating operation will be performed. If operating, the cooling
system is halted as with a completion of a call for cooling.
Heating always takes priority.
Continuous Blower
By setting the room thermostat fan switch to "ON," the supply
air blower will operate continuously.
Intermittent Blower
With the room thermostat fan switch set to "AUTO" and the
system switch set to either the "AUTO" or "HEAT" settings, the
blower is energized whenever a cooling or heating operation is
requested. The blower is energized after any specified delay
associated with the operation.
When energized, the indoor blower has a minimum run time of
30 seconds. Additionally, the indoor blower has a delay of 10
seconds between operations.
No Outdoor Air Options
When the thermostat calls for cooling, the low-voltage control
circuit from “R” to “Y1” and “G” is completed. The compressor and
condenser fan motor are energized. After completing the specified
fan on delay for cooling, the UCB will energize the blower motor.
Once the thermostat has been satisfied, it will de-energize Y1. If
the compressor has satisfied its minimum run time, the
compressor and condenser fan de-energize. Otherwise, the
unit operates the cooling system until the minimum run time for
the compressor has been completed. After the compressor deenergizes, the blower is stopped following the elapse of the fan
off delay for cooling.
To be available, a compressor must not be locked-out due to a
high or low-pressure switch or freezestat trip and the anti-short
cycle delay (ASCD) must have elapsed.
Cooling Operation Errors
Each cooling system is monitored for operation outside of the
intended parameters. Errors are handled as described below. All
system errors override minimum run times for compressors.
28
Should a high-pressure switch open three times within two
hours of operation, the UCB will lock-out the associated
compressor and flash a code (see Table 20).
Low-Pressure Limit Switch
The low-pressure limit switch is not monitored during the initial
30 seconds of a cooling system's operation. For the following
30 seconds, the UCB will monitor the low-pressure switch to
ensure it closes. If the low-pressure switch fails to close after
the 30-second monitoring phase, the UCB will de-energize the
compressor, initiate the ASCD, and stop the condenser fan.
Once the low-pressure switch has been proven (closed during the
30-second monitor period described above), the UCB will monitor
the low-pressure limit switch for any openings. If the low-pressure
switch opens for greater than 5 seconds, the UCB will de-energize
the compressor, initiate the ASCD, and stop the condenser fan.
If the call for cooling is still present at the conclusion of the
ASCD, the UCB will re-energize the compressor.
Should a low-pressure switch open three times within one hour
of operation, the UCB will lock-out the compressor and flash a
code (Table 20).
Freezestat
During cooling operation, if a freezestat opens, the UCB will deenergize the compressor, initiate the ASCD, and stop the
condenser fan. If the call for cooling is still present at the
conclusion of the ASCD, the UCB will re-energize the halted
compressor.
Should a freezestat open three times within two hours of
operation, the UCB will lock-out the associated compressor and
flash a code (Table 20).
Low Ambient Cooling
To determine when to operate in low ambient mode, the UCB
has a pair of terminals connected to a temperature-activated
switch set at 45ºF. When the low ambient switch is closed and
the thermostat is calling for cooling, the UCB will operate in the
low ambient mode.
Low ambient mode operates the compressors in this manner:
10 minutes on, 5 minutes off. The indoor blower is operated
throughout the cycle. The 5-minute off period is necessary to
defrost the indoor coil.
Low ambient mode always begins with compressor operation.
Compressor minimum run time may extend the minutes of
compressor operation. The defrost cycle will begin immediately
following the elapse of the minimum run time.
Johnson Controls Unitary Products
691696-UIM-A-0311
When operating in low ambient mode, the UCB will not lockout
the compressors due to a freezestat trip. However, a freezestat
trip will de-energize the associated compressor. If the call for
cooling is still present at the end of the ASCD and the freezestat
has closed, the unit will resume operation.
Safety Controls
The unit control board monitors the following inputs for each
cooling system:
1.
A suction line freezestat to protect against low evaporator
temperatures due to a low airflow or a low return air
temperature, (opens at 26 ± 5 °F and resets at 38 ± 5°F).
2.
A high-pressure switch to protect against excessive
discharge pressures due to a blocked condenser coil or a
condenser motor failure, (opens at 625 ± 25 psig).
3.
A low-pressure switch to protect against loss of refrigerant
charge, (opens at 50 ± 5 psig).
temperature limit switch circuit. If they are in the expected state,
then the ICB energizes the draft motor and verifies that the
centrifugal switch located on the end of the draft motor closes.
After the centrifugal switch closes, a 15 second heat exchanger
purging period is completed. After this purging period, the ICB
will simultaneously energize the pilot gas valve and the ignition
coil. Once the flame sensor senses a pilot flame is present, the
ignition coil is de-energized. The ICB checks for pilot flame
stability and once the ICB is satisfied that the pilot flame is
stable, the main gas valve is energized by the ICB. The UCB
will energize the indoor blower after a 45 second delay from the
call for heat. The ICB and UCB both monitor the furnace safety
devices during the furnace operation. When the call for heat is
satisfied, the ICB closes the pilot and main gas valves and
performs a 30 second purging of the heat exchanger by
continuing the operation of the draft motor. The UCB continues
the operation of the indoor blower for a configurable amount of
time after the call for heat is satisfied.
Redundant valve
The above pressure switches are hard-soldered to the unit. The
refrigeration systems are independently monitored and
controlled. On any fault, only the associated system will be
affected by any safety/preventive action.
The unit control board monitors the temperature limit switch of
electric heat units and the temperature limit switch and the gas
valve of gas furnace units.
Main valve
Gas main
To main burner
Gas Valve
To pilot burner
Figure 20: Gas Valve Piping
Compressor Protection
In addition to the external pressure switches, the compressor
also has inherent (internal) protection. If there is an abnormal
temperature rise in a compressor, the protector will open to shut
down the compressor. The UCB incorporates features to
minimize compressor wear and damage. An Anti-Short Cycle
Delay (ASCD) is utilized to prevent operation of a compressor
too soon after its previous run. Additionally, a minimum run time
is imposed any time a compressor is energized.
The ASCD is initiated on unit start-up and on any compressor
reset or lock-out.
Flash Codes
The UCB will initiate a flash code associated with errors within
the system. Refer to UNIT CONTROL BOARD FLASH CODES
Table 20.
Reset
Remove the call for cooling, by raising thermostat setting higher
than the conditioned space temperature. This resets any
pressure or freezestat flash codes.
Gas Heating Sequence Of Operations
When there is a W1 call for heat, the heat relay (RW1) is
energized by the unit control board (UCB). The RW1-1 contacts
immediately close energizing the ignition control board (ICB).
The ICB checks the state of the flame sense circuit, the roll out
switch, the centrifugal switch and the primary / auxiliary
Johnson Controls Unitary Products
Gas Heat Operation Errors
During furnace operation, the ICB monitors the flame sense
circuit, the centrifugal switch, the primary limit switch and the
roll out switch. If a signal from any of the inputs moves to a fault
state, then the ICB immediately closes the pilot and main gas
valves. The ICB will determine the device that is signaling a
fault and flash a code for that device. A primary limit trip,
centrifugal switch trip or flame sense fault triggers a temporary
lock out. An auxiliary limit or a roll out switch trip requires
intervention to reset the ICB. The UCB also monitors the
primary limit and gas valve.
Temperature Limits
The primary limit is located such that the temperature
sensitive switch can sense the temperature of the heat
exchanger tubes. On single stage models the limit is mounted
to the condenser partition panel. On two stage models the limit
is mounted just above the inlet of the heat exchanger tubes on
the right side. If a primary limit (LS) fault occurs (the primary
limit opens due to excessive heat exchanger temperature),
then the ICB will flash the appropriate code (Table 21) and
monitor the primary limit. The UCB will energize the indoor
blower and the ICB will energize the draft motor while the
primary limit is open. When the primary limit closes and the
call for heat still exists, the ICB will start the ignition sequence
over and the UCB will de-energize the blower for 45 seconds.
However, the auxiliary limit is in series with the primary limit
and it takes first control. If the excessive heat has been high
29
691696-UIM-A-0311
enough to cause the auxiliary limit (AUX) to open, then the
ICB will flash the primary limit code but the furnace will not
retry ignition during the same call for heat. The auxiliary limit is
of the manual reset type and is mounted in the upper right
hand corner of the panel between the burner manifold and the
flue gas collector box just behind the draft motor. If the
auxiliary switch has opened, then special attention should be
paid to the primary limit as it may be faulty as well. However,
the auxiliary switch is sized such that multiple trips of the
primary limit due to complete blower failure will cause enough
heat to build up and trip the auxiliary.
If the primary limit opens three times within one hour, then the
UCB will lock on the indoor blower and flash a fault code
(Table 20).
Flame Sense Circuit
The flame sensor is mounted on the left hand side of the burner
assembly and is positioned such that the pilot flame surrounds
the tip of the sensor. On a call for heat the ICB checks for the
flame sense circuit to be open. If open, then the ICB initiates the
purging and ignition sequence. Once the pilot flame is present,
the ICB monitors the flame sense circuit for pilot flame stability.
If the pilot flame is unstable or lost completely, then the ICB will
immediately close both the pilot and main gas valves. The ICB
will retry the purging and ignition sequence. If the flame is
unstable or lost more than 16 times during the same call for
heat, then the ICB will lock out furnace operation for 5 minutes.
Table 17: Single Stage Gas Heat Limit Control Setting
Unit
(Tons)
3
4
5
5
Gas Valve
The UCB monitors the gas valve (GV). Any time the UCB senses
voltage at the GV without a call for heat for a continuous fiveminute period, the UCB will lock on the indoor blower and a flash
code on the UCB is initiated (Table 20). When the UCB no longer
senses voltage at the GV the UCB will de-energize the indoor
blower after the expiration of the indoor blower heating off delay.
If the voltage has been sensed at the GV for at least 15
seconds during the fan on delay for heating and the UCB no
longer senses voltage at the GV (W1 call for heat removed or
an ICB fault exists), then the UCB forces the indoor blower on
for the indoor blower heating off delay.
The gas valve is of the redundant type. If for any reason the
main gas valve fails in the open position, then the redundant
valve ahead of the main gas valve will shut off the flow of gas to
both the pilot and main gas valves.
Centrifugal Switch
The centrifugal switch is mounted on the end of the draft motor
and it is an integral part of the motor assembly. On a call for
heat, the ICB checks the centrifugal switch (CS) for open state
before it energizes the draft motor. If it is closed, then the ICB
will lock out the furnace and flash a code (Table 21). If open,
then the ICB will energize the draft motor and verify that the
switch closes before initiating the purging and ignition
sequence. If at any time during furnace operation the
centrifugal switch opens, then the ICB will de-energize the pilot
and main gas valves and monitor the centrifugal switch. If the
centrifugal switch closes and the call for heat still exists, then
the ICB will retry the purging and ignition sequence.
Capacity, MBH
Input
Output
100
80
125
100
100
80
125
100
Limit Control Opens, °F
Direct Drive
Belt Drive
170
210
165
210
170
210
165
210
Flash Codes
The UCB will initiate a flash code associated with errors within
the system. Refer to UNIT CONTROL BOARD FLASH CODES
Table 20.
Resets
Remove the call for heating by lowering the thermostat setting
lower than the conditioned space temperature. This resets any
flash codes.
Heat Anticipator Setpoints
It is important that the anticipator setpoint be correct. Too high
of a setting will result in longer heat cycles and a greater
temperature swing in the conditioned space. Reducing the
value below the correct setpoint will give shorter “ON” cycles
and may result in the lowering of the temperature within the
conditioned space.
Table 18: Gas Heat Anticipator Setpoints
Gas Valve
Honeywell VR8204M
White-Rogers 36E36
Anticipator Setpoints
0.60 amp
0.54 amp
Start-up (Cooling)
Rollout Switch
Prestart Check List
This temperature sensitive switch is located in the burner
vestibule just above the right hand side of the burner assembly.
In the event of the flame spilling out into the burner manifold
area the rollout switch will open, the ICB will close both the
main and pilot gas valves and flash a code (Table 21). The ICB
will not retry the ignition sequence during the same call for heat.
After installation has been completed:
30
1.
Check the electrical supply voltage being supplied. Be sure
that it is the same as listed on the unit nameplate.
2.
Set the room thermostat to the off position.
3.
Turn unit electrical power on.
4.
Set the room thermostat fan switch to on.
5.
Check indoor blower rotation.
Johnson Controls Unitary Products
691696-UIM-A-0311
• If blower rotation is in the wrong direction. Refer to
Phasing Section in general information section.
• Check blower drive belt tension.
6.
5.
Set room thermostat to desired temperature. (If thermostat
“set” temperature is above room temperature, pilot burner
ignition will occur and, after an interval to prove pilot flame,
main burners will ignite).
Check the unit supply air (CFM). See “CHECKING
SUPPLY AIR CFM” on page 27.
To Shut Down:
7.
Measure evaporator fan motor's amp draw.
1.
Turn “off” electric power to unit.
8.
Set the room thermostat fan switch to off.
2.
9.
Turn unit electrical power off.
Depress knob of gas valve while turning to “off” position or
position the switch to the “off” position.
Operating Instructions
Post-Start Check List (Gas)
1.
Turn unit electrical power on.
After the entire control circuit has been energized and the
heating section is operating, make the following checks:
2.
Set the room thermostat setting to lower than the room
temperature.
1.
3.
Compressor will energize after the built-in time delay (five
minutes).
Check for gas leaks in the unit piping as well as the supply
piping.
Post Start Check List
1.
Verify proper system pressures.
2.
Measure the temperature drop across the evaporator coil.
3.
Measure the system Amperage draw across all legs of 3
phase power wires.
4.
Measure the condenser fan amp draw.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
Shut Down
1.
Set the thermostat to highest temperature setting.
2.
Turn off the electrical power to the unit.
2.
Check for correct manifold gas pressures. See “Checking
Gas Input” on page 33.
3.
Check the supply gas pressure. It must be within the limits
shown on rating nameplate. Supply pressure should be
checked with all gas appliances in the building at full fire. At
no time should the standby gas line pressure exceed 13",
nor the operating pressure drop below 5.0" for natural gas
units. If gas pressure is outside these limits, contact the
local gas utility for corrective action.
Start-up (Gas Heat)
Pre-start Check List
Complete the following checks before starting the unit.
1.
Check the type of gas being supplied. Be sure that it is the
same as listed on the unit nameplate.
2.
Make sure that the vent and combustion air hoods have
been properly installed.
“ON” - “OFF” Control
Pilot Adj.
(Under Screw)
High Fire Adj.
(Under Screw)
Operating Instructions
Honeywell
VR8204M
This furnace is equipped with an intermittent pilot
and automatic re-ignition system. DO NOT attempt
to manually light the pilot.
“ON” - “OFF” Control
Figure 21: Typical Single Stage Gas Valves
Manifold Gas Pressure Adjustment
To Light Pilot And Main Burners:
1.
Turn “off” electric power to unit.
Adjustments to gas flow may be made by turning the pressure
regulator adjusting screws on the automatic gas valve.
2.
Turn room thermostat to lowest setting.
Adjust as follows:
3.
Turn gas valve knob or switch to “on” position.
1.
4.
Turn “on” electric power to unit.
Johnson Controls Unitary Products
Remove the adjustment screw cap on the regulator.
31
691696-UIM-A-0311
2.
To decrease the gas pressure, turn the adjusting screw
counterclockwise.
(3) be sure to replace cover screw after adjustment to prevent
possible gas leakage.
3.
To increase the gas pressure, turn the adjusting screw
clockwise.
Put the system into operation and observe through complete
cycle to be sure all controls function properly.
4.
Replace adjustment screw caps.
Burner Instructions
NOTE: The factory set high-fire manifold pressure for these
furnaces is 3.50 IWG. The actual manifold pressure
depends on the local fuel heating value.
Burner assembly bracket
Flame sensor bulb
1/8” gap between carry-over
tube and flame sensor bulb
Carry-over tube
To check or change burners, pilot or orifices, CLOSE MAIN
MANUAL SHUT-OFF VALVE AND SHUT OFF ALL ELECTRIC
POWER TO THE UNIT.
1.
Remove the screws holding either end of the manifold to
the burner supports.
2.
Open the union fitting in the gas supply line just upstream
of the unit gas valve and downstream from the main
manual shut-off valve.
3.
Remove the gas piping closure panel.
4.
Disconnect wiring to the gas valves and spark ignitors.
Remove the manifold-burner gas valve assembly by lifting
up and pulling back.
Burner
Heat Tube
Exchanger
Pilot Tube
Burner Flame
(Blue Only)
Adjustable Shutter
Figure 22: Proper Flame Adjustment
Pilot Checkout
The pilot flame should envelope the end of the flame sensor. To
adjust pilot flame, (1) remove pilot adjustment cover screw, (2)
increase or decrease the clearance for air to the desired level,
32
Gas Supply Pipe
Figure 23: Typical Flame Appearance
Johnson Controls Unitary Products
691696-UIM-A-0311
Burners are now accessible for service.
Reverse the above procedure to replace the assemblies. Make
sure that burners are level and seat at the rear of the heat
exchanger.
Burner Air Shutter Adjustment
Adjust burner shutters so no yellow flame is observed in the
heat exchanger tubes.
Checking Gas Input
Natural Gas
1.
Turn off all other gas appliances connected to the gas meter.
2.
With the furnace turned on, measure the time needed for
one revolution of the hand on the smallest dial on the
meter. A typical gas meter usually has a 1/2 or a 1 cubic
foot test dial.
3.
Using the number of seconds for each revolution and the
size of the test dial increment, find the cubic feet of gas
consumed per hour from the Gas Rate - Cubic Feet Per
Hour (Table 19).
If the actual input is not within 5% of the furnace rating (with
allowance being made for the permissible range of the regulator
setting), replace the orifice spuds with spuds of the proper size.
NOTE: To find the Btu input, multiply the number of cubic feet
of gas consumed per hour by the Btu content of the gas
in your particular locality (contact your gas company for
this information - it varies widely from city to city.)
Johnson Controls Unitary Products
Table 19: Gas Rate-Cubit Feet per Hour1
Seconds for
One Rev.
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
Size of Test Dial
1/2 cu. ft.
1 cu. ft.
180
360
150
300
129
257
113
225
100
200
90
180
82
164
75
150
69
138
64
129
60
120
56
113
53
106
50
100
47
95
45
90
43
86
41
82
39
78
37
75
36
72
35
69
34
67
32
64
31
62
30
60
1. By actual measurement, it takes 38 seconds for the hand on
the 1-cubic foot dial to make a revolution with a 100,000 Btuh
furnace running. Using this information, located 38 seconds
in the first column in the table above. Read across to the
column headed “1 Cubic Foot”, where you will see that 95
cubic feet of gas per hour are consumed by the furnace at
that rate. Multiply 95 X 1050 (the Btu rating of the gas
obtained from the local gas company). The result is 99,750
Btuh, which is close to the 100,000 Btuh rating of the furnace.
33
691696-UIM-A-0311
2.
If the blower motor runs with the fan switch in the ON
position but will not run after the compressor has energized
when the fan switch is in the AUTO position, check the
room thermostat for contact between R and G in the AUTO
position during calls for cooling.
3.
If the supply air blower motor does not energize when the
fan switch is set to ON, check that line voltage is being
supplied to the contacts of the M2, contactor, and that the
contactor is pulled in. Check for loose wiring between the
contactor and the supply air blower motor.
After the temperature rise has been determined, the cfm can be
calculated as follows:
4.
After about 20 minutes of operation, determine the furnace
temperature rise. Take readings of both the return air and the
heated air in the ducts (about six feet from the furnace) where
they will not be affected by radiant heat. Increase the blower
cfm to decrease the temperature rise; decrease the blower cfm
to increase the rise. Refer to the In Door Blower Specification
Table 15.
If M2 is pulled in and voltage is supplied to M2, lightly touch
the supply air blower motor housing. If it is hot, the motor
may be off on internal protection. Cancel any thermostat
calls and set the fan switch to AUTO. Wait for the internal
overload to reset. Test again when cool.
5.
If M2 is not pulled in, check for 24 volts at the M2 coil. If 24
volts are present at M2 but M2 is not pulled in, replace the
contactor.
6.
Failing the above, if there is line voltage supplied at M2, M2
is pulled in, and the supply air blower motor still does not
operate, replace the motor.
7.
If 24 volts is not present at M2, check that 24 volts is
present at the UCB supply air blower motor terminal,
“FAN”. If 24 volts is present at the FAN, check for loose
wiring between the UCB and M2.
8.
If 24 volts is not present at the “FAN” terminal, check for 24
volts from the room thermostat. If 24 volts are not present
from the room thermostat, check for the following:
Adjustment Of Temperature Rise
The temperature rise (or temperature difference between the
return air and the heated air from the furnace) must lie within
the range shown on the rating plate and the data in the Gas
Heat Application Table 9.
CFM =
Btuh Input x 0.8
108
. x oF Temp. Rise
Charging The Unit
T03ZF and T04ZF units use Thermal Expansion Devices;
T05ZF Units use a Fixed Orifice for Refrigerant Control. Charge
all units to 12° subcooling.
Troubleshooting
Troubleshooting of components may require opening
the electrical control box with the power connected to
the unit. Use extreme care when working with live
circuits! Check the unit nameplate for the correct line
voltage and set the voltmeter to the correct range before
making any connections with line terminals.
a. Proper operation of the room thermostat (contact
between R and G with the fan switch in the ON position
and in the AUTO position during operation calls).
b. Proper wiring between the room thermostat and the
UCB.
c. Loose wiring from the room thermostat to the UCB.
9.
When not necessary, shut off all electric power to the
unit prior to any of the following maintenance
procedures so as to prevent personal injury.
If 24 volts is present at the room thermostat but not at the
UCB, check for proper wiring between the thermostat and
the UCB, i.e. that the thermostat G terminal is connected to
the G terminal of the UCB, and for loose wiring.
10. If the thermostat and UCB are properly wired, replace the
UCB.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation which could cause injury to person
and/or damage unit components. Verify proper
operation after servicing.
On a call for cooling, the supply air blower motor is operating
but the compressor is not (the room thermostat fan switch is in
the “AUTO” position).
1.
If installed, check the position of the economizer blades. If
the blades are open, the economizer is providing free
cooling and the compressors will not immediately operate.
If both stages of cooling are requested simultaneously and
the economizer provides free cooling, following a short
delay the compressor will be energized unless it is locked
out, unless this option has been disabled through computer
communications.
2.
If no economizer is installed or the economizer is not
opening to provide free cooling and the compressor does
not energize on a call for cooling, check for line voltage at
On calls for cooling, if the compressors are operating but the
supply air blower motor does not energize after a short delay
(the room thermostat fan switch is in the “AUTO” position).
1.
34
Turn the thermostat fan switch to the ON position. If the
supply air blower motor does not energize, go to Step 3.
Johnson Controls Unitary Products
691696-UIM-A-0311
the compressor contactor, M1, and that the contactor is
pulled in. Check for loose wiring between the contactor and
the compressor.
3.
If M1 is pulled in and voltage is supplied at M1, lightly touch
the compressor housing. If it is hot, the compressor may be
off on inherent protection. Cancel any calls for cooling and
wait for the internal overload to reset. Test again when
cool.
4.
If M1 is not pulled in, check for 24 volts at the M1 coil. If 24
volts are present and M1 is not pulled in, replace the
contactor.
5.
Failing the above, if voltage is supplied at M1, M1 is pulled
in, and the compressor still does not operate, replace the
compressor.
6.
If 24 volts is not present at M1, check for 24 volts at the
UCB terminal, C1. If 24 volts is present, check for loose
wiring between C1 and the compressor contactor.
7.
If 24 volts is not present at the C1 terminal, check for 24
volts from the room thermostat at the UCB Y1 terminal. If
24 volts is not present from the room thermostat, check for
the following:
a. 24 volts at the thermostat Y1 terminal
b. Proper wiring between the room thermostat and the
UCB, i.e. Y1 to Y1, Y2 to Y2
c. Loose wiring from the room thermostat to the UCB.
8.
If 24 volts is present at the UCB Y1 terminal, the
compressor may be out due to an open high-pressure
switch, low-pressure switch, or freezestat. Check for 24
volts at the HPS1, LPS1, and FS1 terminals of the UCB. If
a switch has opened, there should be a voltage potential
between the UCB terminals, e.g. if LPS1 has opened, there
will be a 24-volt potential between the LPS1 terminals.
9.
If 24 volts is present at the UCB Y1 terminal and none of
the protection switches have opened, the UCB may have
locked out the compressor for repeat trips. The UCB
should be flashing an alarm code. If not, press and release
the ALARMS button on the UCB. The UCB will flash the
last five alarms on the LED. If the compressor is locked
out, cancel any call for cooling. This will reset any
compressor lock outs.
NOTE: While the above step will reset any lockouts, the
compressor may be held off for the ASCD. See the next
step.
out, the UCB may have the compressor in an ASCD.
Check the LED for an indication of an ASCD cycle. The
ASCD should time out within 5 minutes. Press and release
the TEST button to reset all ASCDs.
11. If 24 volts is present at the UCB Y1 terminal and the
compressor is not out due to a protective switch trip, repeat
trip lock out, or ASCD, the economizer terminals of the
UCB may be improperly wired. Check for 24 volts at the Y1
“OUT” terminal of the UCB. If 24 volts is present, trace the
wiring from Y1 “OUT” for incorrect wiring. If 24 volts is not
present at the Y1 “OUT” terminal, the UCB must be
replaced.
12. For units without economizers: If 24 volts is present at the
Y1 OUT terminal, check for 24 volts at the Y1 “ECON”
terminal. If 24 volts is not present, check for loose wiring
from the Y1 “OUT” terminal to the Mate-N-Lock plug, the
jumper in the Mate-N-Lock plug, and in the wiring from the
Mate-N-Lock plug to the Y1 “ECON” terminal.
13. For units with economizers: If 24 volts is present at the Y1
“OUT” terminal, check for 24 volts at the Y1 “ECON”
terminal. If 24 volts is not present, check for loose wiring
from the Y1 “OUT” terminal to the Mate-N-Lock plug, a
poor connection between the UCB and economizer MateN-Lock plugs, loose wiring from the Mate-N-Lock plug to
the economizer, back to the Mate-N-Lock plug, and from
the Mate-N-Lock plug to the Y1 “ECON” terminal. If nothing
is found, the economizer actuator may have faulted and is
failing to return the 24-volt “call” to the Y1 “ECON” terminal
even though the economizer is not providing free cooling.
To test, disconnect the Mate-N-Locks and jumper between
the WHITE and YELLOW wires of the UCB’s Mate-N-Lock
plug. If the compressor energizes, there is a fault in the
economizer wiring or actuator.
14. The UCB can be programmed to lock out compressor
operation during free cooling and in low ambient
conditions. These options are not enabled by default. Local
distributors can test the UCB for this programming.
For units with factory installed economizers, the UCB is
programmed to lock out compressor operation when the
LAS set point is reached.
For units without factory installed or with field installed
economizers, the UCB allows compressor operation all the
time. This programming can be checked or changed by the
local distributor.
15. If none of the above correct the error, replace the UCB.
10. If 24 volts is present at the UCB Y1 terminal and none of
the switches are open and the compressor is not locked
Johnson Controls Unitary Products
35
691696-UIM-A-0311
Normal Operating Pressures
3 Ton Charging Chart
Outdoor Temp (ºF)
115º
Discharge Pressure (psi)
460.0
105º
410.0
95º
360.0
85º
310.0
75º
260.0
65º
210.0
100
105
110
115
120
125
130
135
140
145
150
155
160
165
Suction Pressure (psi)
1. Make sure that condenser fan is running when charging.
2. This chart is applicable to unit with the TXV's left to the factory setting. If the TXV's have
been adjusted in the field, The charging chart may no longer apply.
Figure 24: T03ZF (3.0 Ton) Operating Pressures
4 Ton Charging Chart
Outdoor Temp (ºF)
520
115º
Discharge Pressure (psi)
470
105º
420
95º
370
85º
320
75º
270
65º
220
105
110
115
120
125
130
135
140
145
150
155
160
Suction Pressure (psi)
1. Make sure that condenser fan is running when charging.
2. This chart is applicable to unit with the TXV's left to the factory setting. If the TXV's have been
adjusted in the field, The charging chart may no longer apply.
Figure 25: T04ZF (4.0 Ton) Operating Pressures
36
Johnson Controls Unitary Products
691696-UIM-A-0311
5 Ton Charging Chart
Outdoor Temp (ºF)
Discharge Pressure (psi)
530
115°
480
105°
430
95°
380
85°
330
75°
280
65°
230
105
110
115
120
125
130
135
140
145
150
155
160
Suction Pressure (psi)
1. Make sure that condenser fan is running when charging.
2. This chart is applicable to unit with the TXV's left to the factory setting. If the TXV's
have been adjusted in the field, Whe charging chart may no longer apply.
Figure 26: T05ZF (5.0 Ton) Operating Pressures
Gas Heat Troubleshooting Guide
Troubleshooting of components may require opening
the electrical control box with the power connected to
the unit. Use extreme care when working with live
circuits! Check the unit nameplate for the correct line
voltage and set the voltmeter to the correct range before
making any connections with line terminals.
When not necessary, shut off all electric power to the
unit prior to any of the following maintenance
procedures so as to prevent personal injury.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation, which could cause injury to person
and/or damage unit components. Verify proper
operation after servicing.
Flash Code Troubleshooting
Power to the unit should be interrupted during the
Johnson Controls Unitary Products
The furnace may shut down on a high temperature
condition during the procedure. If this occurs, the UCB
energize the supply air blower motor until the high
temperature limit has reset. Caution should be used at
all times as the supply air blower may energize
regardless of the room thermostat fan switch position.
Before beginning symptomatic troubleshooting activities read
the flash code LEDs on the unit control board (UCB) and the
ignition control board (ICB). Fault codes have a quick sequence
of flashes indicating the flash code number followed by a pause
with the LED off. The ICB flash codes are repeated until the
fault is cleared. The ICB monitors itself, the centrifugal switch,
lockout due to > 16 pilot flame losses, primary limit, rollout and
a flame present when the ICB expects no flame.
With power applied to the unit, if the LED on the ICB is flashing
the heartbeat and the furnace will not operate, then proceed to
the symptomatic troubleshooting section. If the ICB LED is not
flashing, then perform the ICB troubleshooting procedures. If the
ICB has a flash code other than the heartbeat, then determine
the flash code and locate its troubleshooting procedures in the
flash code troubleshooting section. Refer to Table 21 for flash
code identification and component causing fault.
troubleshooting of individual components unless otherwise
indicated. All troubleshooting procedures assume the unit is
wired per the wiring diagram. If there is any indication the unit
37
691696-UIM-A-0311
has been previously repaired, then the first priority is to verify
that the furnace is wired per the wiring diagram. Miss-wired
units will give false flash codes.
Ignition Control Board
The ICB controls the ignition of the pilot, the opening and
closing of the gas valves and the operation of the draft (inducer)
motor. It also monitors all the furnace safety components.
If the ICB LED is on steady, then verify the wiring of the unit to
the wiring diagram and if ok, then replace the ICB. If the unit
has power and the ICB LED is not flashing, then remove the 3
pin connector (single stage gas heat) or 4 pin connector (2
stage gas heat) from the ICB. Measure the control voltage
between terminals 1 and 2 of the wiring harness connector. The
control voltage must be between 18 and 30 volts. If control
voltage is not present, then check the 3.2A circuit breaker to
verify that the circuit breaker has control voltage on both input
and output terminals. If control voltage is present on the input
and not the output of the circuit breaker, then reset or replace
the circuit breaker as necessary. If control voltage is present on
both sides of the circuit breaker, then check the power and
common wires between the unit control box and the ICB and
repair as necessary. If the control voltage is present, then verify
the cleanliness of the harness and the ICB connector, clean if
necessary and reconnect the wiring harness to the ICB and
observe ICB LED. If it now flashes the heartbeat, then the fault
was a bad connection between the harness connector and the
ICB connector or a broken wire exists in the harness. With the
harness connected to the ICB, gently move the wires in the
harness while observing the ICB LED. If heartbeat is steady,
then verify proper operation of the furnace. If the ICB does not
flash the heartbeat, then gently move the wires in the harness
connector while observing the ICB LED. If you get any flashes
of the ICB LED, then there is still a bad connection or a broken
wire. If no flashes are seen while gently moving the wires with
the harness connected to the ICB, then replace the ICB and
verify proper operation of the furnace.
Centrifugal Switch
The centrifugal switch is an integral part of the draft motor. The
centrifugal switch closes when the motor speed increases to
~2500 rpm and opens when the motor speed descends to
~2000 rpm.
If a flash code indicates the centrifugal switch is causing a fault,
then
1.
If the flash code indicates the switch is open with the draft
(inducer) motor on (flash code 2), then
a. Disconnect power to the unit. Using a screw driver, spin
the draft motor blower wheel. If bound or dragging, then
visually inspect the draft motor blower wheel area for
debris. If debris is present, then clear debris and verify
proper furnace operation. If clear, then replace the draft
motor and verify proper furnace operation.
b. Restore power to unit and induce a call for heat.
Measure the voltage across the two draft motor leads
(white and red on single stage models and white and
38
2.
black on two stage models). If it is less than 177 volts,
then check and repair the power circuit to the draft
motor. If the voltage is greater than 176 volts and the
draft motor is not turning, then disconnect power and
draft motor power leads. Measure the resistance of the
draft motor windings. If an open circuit exists in the
motor, then replace the draft motor. If the voltage is
greater than 176 volts and the motor is turning, then
check the centrifugal switch wiring between the ICB and
the draft motor. If ok, then disconnect power to the unit
and place the gas valve in the off position. Prepare to
temporarily jumper the wires connected to terminals 3
and 8 of the ICB 9 pin harness connector by
disconnecting the draft motor leads from the 9 pin
harness. Restore the power to the unit and induce a call
for heat. Jumper wires 3 and 8. If the ignition sequence
is started after 15 seconds (audible sparking of the
igniter), then replace the draft motor reconnecting the
centrifugal switch wiring per the wiring diagram. If not,
then replace the ICB, remove the jumper and reconnect
the centrifugal switch wiring per the wiring diagram.
Place the gas valve in the on position and verify proper
furnace operation.
If the flash code indicates the switch is closed with the draft
(inducer) motor off (flash code 3), then disconnect the 9 pin
connector from the ICB and measure the continuity of the
centrifugal switch with a battery powered test light or an
ohm meter between terminals 3 and 8 of the harness
connector. If a closed circuit is indicated, then check the
wiring between the ICB and the draft motor. If the wiring is
not shorted together, then replace the draft motor. If an
open circuit is indicated, then reconnect the 9 pin wiring
harness to the ICB and remove power to the unit for at
least 20 seconds. Restore power to the unit. If the ICB
continues to flash a code 3, then replace the ICB.
Pilot Flame Lockout
The ICB counts the number of flame losses during the same call
for heat. If more than 16 flame losses occur within the same call
for heat, then the control temporarily locks out furnace operation
for 5 minutes (flash code 5). If the call for heat remains after the
5 minutes, then the ICB will retry the ignition sequence. The
flame losses can be due to low inlet pressure, debris around
flame sensor, plugged pilot burner, soot on the surface of the
flame sensor or misadjusted pilot pressure. Remove the power
to the unit for 20 seconds and then restore power to the unit.
Induce a call for heat and observe the pilot flame in the flame
sensor area to determine the best course of action.
1.
If the flame is strong and stable in the flame sensor area,
then verify the position of the flame sensor per the start up
procedures. If ok, then remove the flame sensor and check
the cleanliness of the electrode. If clean, then replace the
flame sensor and adjust pilot per the start up procedures. If
not clean, then clean, reinstall and adjust pilot per the start
up procedures.
2.
If the flame is weak or unstable in the flame sensor area,
then verify the gas inlet pressure. If gas inlet pressure is
above the minimum inlet pressure stated on unit data label,
Johnson Controls Unitary Products
691696-UIM-A-0311
then adjust the pilot pressure per the start up procedures. If
the pilot cannot be adjusted to obtain a strong and stable
flame in the flame sensor area, then remove the burner
assembly and verify the pilot burner assembly is open
internally and the holes in the burner are clean. Check the
pilot orifice size to the unit data plate and the cleanliness of
the pilot orifice. Verify that the flame sensor electrode is
clean and is adjusted properly. After cleaning or
replacement of the pilot assembly components, reinstall the
burner assembly and adjust pilot per the start up procedure.
Primary or Aux Temperature Limit
The temperature limits limit the temperature in the furnace to a
safe level. If a temperature higher than the preset limit is
achieved due to low or no air flow through the furnace, then the
temperature limits opens and the ICB closes the gas valve and
flashes code 6. The primary limit is automatic reset type while
the auxiliary limit is manual reset type. If either one opens, then
the ICB removes power to the gas valve and the UCB
energizes the indoor blower until the primary limit automatically
resets or the auxiliary limit is manually reset. Verify adequate air
flow through the furnace. If air flow is nonexistent or weak, then
troubleshoot and repair the conditioned space air circulation
system as necessary. Reset the auxiliary limit and verify proper
operation of the furnace. If airflow is normal, then verify the gas
input rate to the furnace following the start up procedures
(auxiliary limit must be reset before the furnace will operate). If
after verifying the circulating air system, the input rate to the
furnace and that the air temperature rise through the furnace is
within the rise range on the unit data plate the flash code still
exists, then set the gas valve to the off position and temporarily
apply control voltage (~24 volts) to pin 9 of the 9 pin ICB
connector. With power applied to the unit, if the ICB LED
continues to flash a code 6, then replace the ICB and return unit
to operation (you must remove the temporary voltage to pin 9
before the gas valve is turned on). If the ICB LED flashes a
heartbeat, then replace the limit that is opening, remove the
temporary voltage applied to pin 9, turn on the gas valve, restart
the furnace and verify proper operation of the furnace.
4.
Cracked heat exchanger tube(s). If a heat exchanger tube or
tubes is cracked, then the flow through the heat exchanger
is restricted and the flame will either roll out of the tube inlet
or heat will build to an abnormal level in the burner area.
This can usually be determined by observing burner flame
with and without indoor blower operation. If the flame
changes when the blower is running compared to when it is
not, then visually inspect the heat exchanger tubes.
If all of the above are found to be in good condition or within the
operating ranges, then set the gas valve to the off position and
temporarily apply control voltage (~24 volts) to pin 6 of the 9 pin
ICB connector. With power applied to the unit, if the ICB LED
continues to flash a code 7, then replace the ICB and return unit
to operation (you must remove the temporary voltage to pin 6
before the gas valve is turned on). If the ICB LED flashes a
heartbeat, then replace the rollout switch, remove the
temporary voltage applied to pin 6, turn on the gas valve, restart
the furnace and verify proper operation of the furnace.
Unexpected Flame Presence
If a flame is present without a call for heat (flash code 8), then
the ICB will continue operation of the draft motor and the UCB
will call for indoor operation when either of the temperature limit
opens. If the unit is correctly wired and there is not a call for
heat, then check for control voltage to the gas valve. If control
voltage exists at the gas valve, then replace the ICB. If voltage
is not present at the gas valve, then replace the gas valve.
Gas Valve Stuck Off or On
If the pilot and/or the main valves are sensed to be off more
than 1 second when commanded to be on, the control will shut
off all outputs and enter a hard lockout (flash code 9). Likewise,
if the pilot and/or the main valves are sensed to be on more
than 1 second when commanded to be off, the control will shut
off all outputs and enter a hard lockout (flash code 9). The
control will not respond to thermostat demands during a hard
lockout. The only way to recover from a hard lockout is to
remove and reapply 24VAC power to the control.
Rollout Switch
Flame Sense Circuit Failure
The rollout switch is installed to protect the furnace from
damage due to excessive heat in the burner area. There are 4
main reasons the rollout switch will open (flash code 7) due to
excessive heat in the burner area. You must remove power to
the unit for 20 seconds to reset the ICB.
If the control detects an internal hardware failure in the flame
sense circuit, it shuts off all outputs and enters a hard lockout
(flash code 10). The control will not respond to thermostat
demands during a hard lockout. The only way to recover from a
hard lockout is to remove and reapply 24VAC power to the
control. If problem persists after removal and reapplication of
24VAC power, the board may need to be replaced.
1.
A blocked flue outlet is the most common cause for the
rollout switch to open. Check the flue outlet for debris and
clear if necessary.
2.
Loose blower wheel on draft motor. Verify that the blower
wheel is securely fastened to the draft motor shaft.
3.
Unit operating outside the air temperature rise range stated
on the unit data plate. Either the air flow through the
furnace is not sufficient or the gas input rate to the furnace
exceeds the recommended rate. Verify both conditions are
within the published ranges.
Johnson Controls Unitary Products
Symptomatic Troubleshooting
On calls for heating, the draft motor operates and the furnace
lights but the supply air blower motor does not energize after a
short delay (the room thermostat fan switch is in “AUTO”
position).
1.
Place the thermostat fan switch in the “ON” position. If the
supply air blower motor energizes, go to Step 10.
39
691696-UIM-A-0311
2.
If the supply air blower motor does not energize when the
fan switch is set to “ON,” check that line voltage is being
supplied to the contacts of the M2 contactor, and that the
contactor is pulled in. Check for loose wiring between the
contactor and the supply air blower motor.
3.
If M2 is pulled in and voltage is supplied at M2, lightly touch
the supply air blower motor housing. If it is hot, the motor
may be off on inherent protection. Cancel any thermostat
calls and set the fan switch to “AUTO”, wait for the internal
overload to reset. Test again when cool.
4.
If M2 is not pulled in, check for 24 volts at the M2 coil. If 24
volts is present at M2 but M2 is not pulled in, replace the
contactor.
5.
Failing the above, if there is line voltage supplied at M2, M2
is pulled in, and the supply air blower motor still does not
operate, replace the motor.
6.
If 24 volts is not present at M2, check that 24 volts is
present at the supply air blower motor terminal on the UCB.
If 24 volts is present at the UCB terminal, check for loose
wiring between the UCB and M2.
7.
If 24 volts is not present at the UCB supply air blower motor
terminal, check for 24 volts from the room thermostat. If 24
volts is not present from the room thermostat, check for the
following:
3.
a. Proper operation of the room thermostat (contact
between R and G with the fan switch in the “ON”
position and in the “AUTO” position during operation
calls).
b. Proper wiring between the room thermostat and the
UCB.
c. Loose wiring from the room thermostat to the UCB.
8.
9.
If 24 volts is present at the room thermostat but not at the
UCB, check for proper wiring between the thermostat and
the UCB, i.e. that the thermostat G terminal is connected to
the G terminal of the UCB, and for loose wiring.
If the thermostat and UCB are properly wired, replace the
UCB.
10. If the blower motor runs with the fan switch in the “ON”
position but does not run shortly after the furnace has
ignited when the fan switch is in the “AUTO” position,
check the room thermostat for contact between R and G
during “W1” calls.
The draft motor is a 230 volt draft motor on all models
regardless of unit supply voltage. If the ICB is flashing a
code other than the heartbeat, then troubleshoot the device
indicated by the fault code. If not, then remove power to the
unit for more than 20 seconds. If upon restoring the power
to the unit the draft motor does not start with a call for heat,
then verify that terminal “L1” of the ICB has a minimum of
120 volts to ground on 230 and 460 volt models or a
minimum of 18 volts to ground on 575 volt models. If
terminal “L1” does not have the minimum voltage, then
check the wiring between the unit control box and the ICB
on all models and on 460 volt models, the transformer in
the gas heat compartment and its wiring. If terminal “L1”
does have the minimum voltage, then check for the
minimum voltage on terminal “IND” of the ICB on single
stage models and terminal “IND HIGH” of the ICB on two
stage models. If voltage is not present at the terminal, then
verify wiring between the control box and the ICB. If all
wiring is intact, then ICB is at fault. If voltage is present at
the terminal on 230 and 460 volt models, then the draft
motor is at fault. On 575 volt models, if voltage is present at
the terminal, then check the draft motor relay (DMR on
single stage gas heat and DMR-2 on two stage gas heat)
mounted above the ICB. First verify that the relay is pulled
in by visual inspection. If not, then verify the minimum
voltage is present between terminals “A” and “B” of the
relay. If the minimum voltage is not present, then check the
wiring. If it is present, then verify that a minimum of 150
volts is present at terminals “5” and “7” of the draft motor
relay. If not present at terminal “7” of the draft motor relay,
then troubleshoot the transformer in blower section and its
wiring. If present at terminal “7” and not at terminal “5” of
the draft motor relay, then the relay is at fault. If the
minimum voltage is present at terminal 5 of the draft motor
relay, then the draft motor is at fault.
The ignitor sparks at the pilot burner but the pilot does not ignite
and a gas odor is detected at the draft motor outlet.
1.
Adjust the pilot adjust screw on the gas valve as described
in “PILOT CHECKOUT” on page 32.
2.
Check the supply pressure as described in “POST START
CHECK LIST” on page 31. Make adjustments as
necessary.
3.
Check the pilot orifice and pilot burner for obstruction as
described in paragraph above. Clean as needed but the
problem should not be the gas valve.
On calls for heating, the supply air blower operates but the draft
motor does not (the room thermostat fan switch is in the
“AUTO” position).
The pilot burner ignites but the ignitor continues to spark and
the main burners do not ignite.
1.
The draft motor has inherent protection. If the motor shell is
hot to the touch, wait for the internal overload to reset.
1.
Make the same checks and adjustment as described in
“PILOT CHECKOUT” on page 32.
2.
If the motor shell is cold with the room thermostat calling
for heat, check if 24 volts is present at the room thermostat
but not at the UCB, check for proper wiring between the
thermostat and the UCB, i.e. that the thermostat “W1”
terminal is connected to the “W1” terminal of the UCB, and
for loose wiring.
2.
Check the supply pressure as described in “POST START
CHECK LIST” on page 31. Make adjustments as
necessary.
3.
Make sure that the pilot burner is not bent or damaged.
4.
Make sure that the ground connections at the pilot burner,
gas valve and ignition control are intact. Check the ignitor
40
Johnson Controls Unitary Products
691696-UIM-A-0311
wire for good electrical connection. If all are intact, replace
the ignition control.
The pilot burner lights and the spark stops but the main burners
do not light.
1.
Check electrical connections between the ignition control
and the gas valve. If intact, check for 24 volts across
terminals “MV” and “GROUND” terminals. If no voltage
detected, replace ignition control. If voltage is present,
replace gas valve.
Main burners light but exhibit erratic flame characteristics.
1.
Adjust air shutters as described in “BURNER AIR
SHUTTER ADJUSTMENT” on page 33.
2.
Check the main burner orifices for obstruction and
alignment. Removal procedure is described in BURNER
INSTRUCTIONS on page 32. Clean or replace burner
orifices and burners as needed.
Unit Flash Codes
Various flash codes are utilized by the unit control board (UCB)
and the ignition control board (ICB) to aid in troubleshooting.
Flash codes are distinguished by the short on and off cycle
used (approximately 200ms on and 200ms off). To show normal
operation, the control boards flashes a 1 second on, 1 second
off “heartbeat” during normal operation. This is to verify that the
UCB and the ICB are functioning correctly. Do not confuse this
Johnson Controls Unitary Products
with an error flash code. To prevent confusion, a 1-flash, flash
code is not used.
Current alarms or active restrictions are flashed on the UCB
LED.
• LAST ERROR - When this button is pressed and released
one time within five seconds, it flashes the last five flash
codes on the board’s LED. The most recent alarm is
shown first and the oldest alarm is shown last.
When pressed and released twice within a five second
span, the fault history is cleared.
• TEST RESET - When this button is pressed and released
one time within five seconds, any anti-short cycle delays
(ASCD) is by-passed for one cycle.
When this button is pressed twice within five seconds, any
active lockouts are reset.
• COMM SET UP - If the board is to be networked with
other units, this button is used to set the network address.
The first time the button is pressed within five seconds, it
scans the bus, then assigns itself the first available
address {starts at 2}. It then flashes that address one time.
Pressing the button two times within five seconds causes
the control to flash its address.
Pressing the button three times within five seconds forces
the control to reset its address to 1, which is the factory
default.
41
Fan On And Off Delays
The fan ON and OFF delays can be field adjusted by pressing a
combination of buttons on the UCB.
• Gas Heat Option #1 - Press the LAST ERROR and
TEST RESET buttons simultaneously and then release.
The control flashes three times as it writes a 30 second
delay ON and a 90 second delay OFF to the program.
• Gas Heat Option #2 - Press the COMM SETUP and
TEST RESET buttons simultaneously and then release.
The control flashes four times as it writes a 30 second
delay ON and a 180 second delay OFF to the program.
• Electric Heat - Press and release the COMM SETUP and
LAST ERROR buttons at the same time. The control
flashes twice on the LED as the control writes a 0 second
ON and a 30 second OFF fan delay to the control’s
program memory.
Comm Setup
Button
Last Error
Button
Test Reset
Button
Control Board
LED
Table 20: Unit Control Board Flash Codes
Flash Code
On Steady
Heart Beat
1 Flash
2 Flashes
3 Flashes
5 Flashes
7 Flashes
9 Flashes
10 Flashes
11 Flashes
13 Flashes
14 Flashes
OFF
Description
Control Failure - Replace Control
Normal Operation
Not Applicable
Control waiting ASCD1
HPS1 - Compressor Lock out
LPS1 - Compressor Lock out
FS1 - Compressor Lock out
Ignition Control Locked Out/
Ignition Control Failure / Limit Switch Trip / No
Jumper Plug in Heat Section
Compressors Locked Out On Low
Outdoor Air Temperature1
Compressors Locked Out Because The
Economizer Is Using Free Cooling1
Compressor Held Off Due To Low Voltage1
EEPROM Storage Failure (Control Failure)
No Power or Control Failure
Figure 27: Unit Control Board
Table 21: Ignition Control Board Flash Codes
Flash Code
Heart Beat
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes
10 Flashes
Description
Normal Operation
Not Applicable
Pressure / Centrifugal Switch Open with Inducer On
Pressure / Centrifugal Switch Closed with Inducer
Off
Not Applicable
Lock Out From Too Many Flame Losses
High Temperature Switch Open (Primary or Aux.)
Rollout Switch Open
Flame Present With Gas Off
Gas Valve Stuck Off or On
Flame Sense Circuit Failure
1. These flash codes do not represent alarms.
Subject to change without notice. Printed in U.S.A.
Copyright © 2011 by Johnson Controls, Inc. All rights reserved.
Johnson Controls Unitary Products
5005 York Drive
Norman, OK 73069
691696-UIM-A-0311
Supersedes: Nothing
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