bch installation instruction

®
INSTALLATION INSTRUCTION
SUNLINE 2000
SINGLE PACKAGE HEAT PUMPS
WITH OR WITHOUT SUPPLEMENTAL ELECTRIC HEAT
511.06-N3Y (500)
Supersedes: 511.06-N3Y (1294)
035-12546-000
MODELS B1CH180 & 240
(8.5 - 8.8 EER)
208/230/460 VOLT
MODELS ONLY
208/230/575 VOLT
MODELS ONLY
SAFETY CONSIDERATIONS
REFERENCE
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, maintain or service this
equipment.
Additional information on the design, installation, operation and
service of this equipment is available in the following reference
forms:
Observe all precautions in the literature, on labels and tags
accompanying the equipment whenever working on air
conditioning equipment. Be sure to follow all other safety
precautions that apply.
Wear safety glasses and work gloves, and follow all safety
codes. Use a quenching cloth and have a fire extinguisher
available for all brazing operations.
GENERAL
YORK Model BCH units are single package heat pumps
designed for outdoor installation on a rooftop or a slab. These
units can be equipped with factory installed electric heaters for
cooling/heating applications.
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, duct connections and installation of fixed outdoor air
intake damper (units without economizer or motorized damper
option only) at the point of installation.
The supplemental electric heaters have nickel-chrome
elements and utilize single point power connection.
INSPECTION
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. Refer to Form 50.15-NM for additional information.
• 55.70-N1
• 55.70-N2
• 44-320-10
- General Installation
- Pre-start & Post-start Check List
- Barometric Relief Damper Accessory
Renewal Parts:
• Refer to the Renewal Parts Manual for complete listing of
replacement parts on this equipment.
All forms referenced in this instruction may be ordered from:
Standard Register
Norman, OK 73069
Toll Free: Tel. 877-318-9675/Fax. 877-379-7920
APPROVALS
Design certified by ETL & CGA as follows:
1. For use as a heat pump only unit or a heat pump with or
without supplemental electric heat.
2. For outdoor installation only.
3. For installation on combustible material.
CAUTION
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.
WARNING
INCORRECT INSTALLATION MAY CREATE A CONDITION
WHERE THE OPERATION OF THE PRODUCT COULD CAUSE
PERSONAL INJURY OR PROPERTY DAMAGE
Installer should pay particular attention to the words: NOTE, CAUTION and WARNING. Notes are intended to clarify or make
the installation easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personal injury
and/or equipment damage may result if installation procedure is not handled properly.
511.06-N3Y
TABLE OF CONTENTS
General ................................................................................ 1
Inspection............................................................................. 1
Reference............................................................................. 1
Approvals ............................................................................. 1
Nomenclature....................................................................... 2
MAINTENANCE
Normal Maintenance ......................................................... 18
TABLES
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
INSTALLATION
Limitations ............................................................................ 3
Location ............................................................................... 3
Rigging and Handling .......................................................... 3
Clearances........................................................................... 3
Ductwork .............................................................................. 3
Fixed Outdoor Air Intake Damper ........................................ 4
Condensate Drain ................................................................ 4
Compressors........................................................................ 4
Filters ................................................................................... 4
Service Access .................................................................... 4
Thermostat........................................................................... 4
Power and Control Wiring .................................................... 4
Optional Electric Heaters ..................................................... 5
Optional Economizer/Mot. Damper Rain Hood ................... 5
Optional Power Exhaust Rain Hood .................................... 7
Description
Page
Unit Application Data ..................................
3
Control Wire Sizes ......................................
5
Electric Heat Application Data ....................
5
Physical Data ..............................................
8
Four and Six Point Loads............................ 10
Supply Air Blower Perf. 15 Ton.................... 12
Supply Air Blower Perf. 20 Ton.................... 12
Static Resistances ...................................... 13
Power Exhaust Performance ...................... 13
Blower Motor and Drive Data...................... 13
Electrical Data (Basic Units) ....................... 14
Electrical Data (Units w/Elec. Heat)............ 14
Heat Anticipator Setpoints .......................... 16
FIGURES
No.
1
2
3
4
5
6
7
8
9
10
11
12
OPERATION
Cooling System.................................................................. 15
Preliminary Operation Cooling........................................... 15
Cooling Sequence of Operation......................................... 15
Heating Sequence of Operation ........................................ 15
Heat Anticipator Setpoints ................................................. 16
Checking Supply Air CFM.................................................. 16
Defrost Sequence of Operation ......................................... 17
Secure Owner’s Approval .................................................. 18
Description
Page
Typical Rigging............................................
3
Center of Gravity.........................................
3
Fixed Outdoor Air Damper..........................
4
Recommended Drain Piping.......................
4
Typical Field Wiring .....................................
5
Adjusting Enthalpy Setpoint........................
7
Dimensions and Clearances.......................
9
Four and Six Point Loads............................ 10
Belt Adjustment........................................... 16
Pressure Drop versus Supply Air CFM ...... 16
Defrost Initiation Times ............................... 17
Ambient Modified Time/Temp. Control ........ 18
PRODUCT NOMENCLATURE
B
1
C
H
1
8
0
E
0
1
8
2
5
PRODUCT CATEGORY
B = Single Package Heat Pump
(Air Cooled)
PRODUCT GENERATION
1 = 1st Generation
NOMINAL HEATING
CAPACITY
PRODUCT IDENTIFIER
018 = 18 KW
036 = 36 KW
054 = 54 KW
072 = 72 KW
CH = Heat Pump
NOMINAL COOLING
CAPACITY
180 = 15 Tons
240 = 20 Tons
2
FACTORY INSTALLED
HEAT
E
C
FACTORY INSTALLED
OPTION CODE
EC = Sing. Input Economizer
DK = Diff. Input Economizer
FD = Sing. Input Economizer
w/Power Exhaust
CF = Diff. Input Economizer
w/Power Exhaust
BG = Motor Outdoor Air
Damper
VOLTAGE CODE
25 = 208/230-3-60
46 = 460-3-60
58 = 575-3-60
A = No Heat
E = Electric
Unitary Products Group
511.06-N3Y
INSTALLATION
LIMITATIONS
These units must be installed in accordance with the following
national and local safety codes:
In U.S.A.:
1. National Electrical Code ANSI/NFPA No. 70.
2. Local electric utility requirements.
In Canada:
1. Current Canadian Electrical Code CSA C22.1.
2. Local electrical codes.
Refer to the Unit Application Data and to thefor Electric Heat
Application Data table.
If components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or the customer’s
expense.
Size of unit for proposed installation should be based on heat
loss/heat gain calculation made according to the methods of
the Air Conditioning Contractors of America (ACCA).
TABLE 1 - UNIT APPLICATION DATA
Model Size
208/230-3-60
Voltage Variation,
460-3-60
1
Min. / Max.
575-3-60
Supply Air CFM, Min. / Max.
Wet Bulb Temperature (°F)
of Air on Indoor Coil
Min. / Max.
Dry Bulb Temperature (°F)
of Air on Outdoor Coil
Min. / Max.
15 TON
20 TON
187 / 253
414 / 506
518 / 630
45002 / 7200 6000 / 9400
FIG. 1 - TYPICAL RIGGING
Units may also be moved or lifted with a forklift, from the front
or rear only, providing that an accessory skid is used.
LENGTH OF FORKS MUST BE A MINIMUM OF 90".
Refer to the Physical Data tablefor unit weights and to the figure
below for approximate center of gravity.
OUTDOOR
COIL END
57 / 72
45 / 120
1
Rated in accordance with ARI Standard 110, utilization range "A".
2
5,000 CFM on 15 ton models with either a 54 or 72 KW heater at 208/230 volts.
LOCATION
FIG. 2 - CENTER OF GRAVITY
Use the following guidelines to select a suitable location for
these units.
1. Unit is designed for outdoor installation only.
2. Outdoor 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. 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 rail
dimensions. Do not tie slab to the building foundation.
4. Roof structures must be able to support the weight of the
unit and its options and/or accessories. Unit must be
installed on a solid level roof curb or appropriate angle iron
frame.
CLEARANCES
CAUTION: If a unit is to be installed on a roof curb or
special frame other than a YORK roof curb,
gasketing must be applied to all surfaces that
come in contact with the unit underside.
5. Maintain level tolerance to 1/2" maximum across the entire
length or width of the unit.
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 round lifting holes
provided in the base rails. Spreaders, whose length exceeds
the larger dimension across the unit, MUST be used across the
top of the unit. Refer to the Typical Rigging Figure.
Unitary Products Group
All units require certain clearances for proper operation and
service. Refer to the Dimensions and Clearances Figure for the
clearances required for combustible construction, servicing,
and proper unit operation.
WARNING: Do not permit overhanging structures or shrubs to
obstruct outdoor air discharge outlet.
DUCTWORK
Ductwork should be designed and sized according to the
methods in Manual Q of the Air Conditioning Contractors of
America (ACCA).
A closed return duct system shall be used. This shall 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 transmission of noise.
The supply and return air duct systems should be designed for
the CFM and static requirements of the job. They should NOT
be sized to match the dimensions of the duct connections on
the unit.
CAUTION: When fastening ductwork to side duct flanges on
the unit, insert screws through duct flanges only.
DO NOT insert screws through casing.
Outdoor ductwork must be insulated and
waterproofed.
Refer to the Dimensions and Clearances Figure for information
concerning side and bottom supply and return air duct openings.
3
511.06-N3Y
FIXED OUTDOOR AIR INTAKE DAMPER
This damper is shipped inside the return air compartment. It is
completely assembled and ready for installation. A damper
baffle inside the hood is adjustable to provide variable
amounts of outdoor air intake on units that are not provided
with an economizer or a motorized damper option.
Gasketing and mounting screws are provided in a parts bag
attached to the hood assembly. Apply gasketing to the three
flange surfaces on the hood prior to installing the hood. Extend
gasketing 1/4" beyond the top and bottom of the two side
flanges to insure adequate sealing.
Adjusting the damper to the desired air flow may be done before
mounting the hood into position or (after installation) by
removing the front hood panel or the screen on the bottom of
the hood. Damper baffle in position 1 will allow approximately
10% recirculated air flow, position 2 approximately 15% and, to
allow approximately 25%, remove the damper baffle.
On units with bottom return air applications, install the damper
assembly over the opening in the side return air access panel.
Remove and discard the opening cover and the covering over
the hood mounting holes (used for shipping) before installing.
Secure with the screws provided.
On units with side return air applications, install the damper
assembly on the return air ductwork as close to the unit as
possible. Cut an opening 16" high by 18" wide in the ductwork
to accommodate the damper. Using the holes in the hood
flanges as a template, drill 9/64" dia. (#26 drill) holes into the
ductwork and secure with the screws provided.
CAUTION: If outdoor air intake will not be required on units
with bottom return air applications, the damper
assembly should still be mounted on the side return
air access panel, per the instructions above, to
insure moisture is not drawn into the unit during
operation. The covering over the mounting holes
only need be removed. Do not remove the opening
cover.
FIG. 4 - RECOMMENDED DRAIN PIPING
COMPRESSORS
Units are shipped with compressor mountings factory-adjusted
and ready for operation.
CAUTION: Do Not loosen compressor mounting bolts.
FILTERS
2" filters are supplied with each unit. Filters must always be
installed ahead of the indoor coil and must be kept clean or
replaced with same size and type. Dirty filters will reduce the
capacity of the unit and will result in frosted coils or safety
shutdown. Minimum filter area and required sizes are shown in
the Physical Data table.
SERVICE ACCESS
Access to all serviceable components is provided by the
following removable panels:
•
•
•
•
•
•
•
Compressor compartment
Electric Heat compartment
Side Supply & Return Air compartments (Two panels)
Blower compartment (Three panels)
Main control box
Filter compartment
Outdoor Air compartment (Two panels)
Refer to Dimensions and Clearnaces Figure for location of
these access panels.
CAUTION: Make sure that all screws and panel latches are
replaced and properly positioned on the unit to
maintain an air-tight seal.
THERMOSTAT
FIG. 3 - FIXED OUTDOOR AIR DAMPER
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate drain line
from the 1" NPT female connection on the unit to an open drain.
An alternate drain connection (1" NPT female coupling) is
provided inboard on the same centerline as the exterior
location.
The room thermostat should be located on an inside wall
approximately 56" above the floor where it will not be subject
to drafts, sun exposure or heat from electrical fixtures or
appliances. Follow manufacturer’s instructions enclosed with
thermostat for general installation procedure. Color coded
insulated wires (#18 AWG) should be used to connect
thermostat to unit. Eight conductors are required.
The subbase on the low voltage thermostat includes an
"Emergency Heat" position on the system switch and a pilot
light. In the "Emergency Heat" position, the thermostat will
provide electric resistance heat only. The compressors will not
run. The pilot light will indicate that the switch is on "EM HT".
Nine conductors are required for this application.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the
National Electrical Code, ANSI / NFPA No. 70 (in U.S.A.),
current Canadian Electric Code (CEC) CSA C22.1 (in Canada)
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.
NOTE: The condensate drain operates in a negative pressure
in the cabinet. The condensate drain line MUST be
trapped to provide proper drainage.
4
Unitary Products Group
511.06-N3Y
FIG. 5 - TYPICAL FIELD WIRING
The internal wiring harness furnished with this unit is an integral
part of a ETL and CGA design certified unit. Field alteration to
comply with electrical codes should not be required.
A fused disconnect switch should be field provided for the unit.
The switch must be separate from all other circuits. Wire entry
at knockout openings require conduit fittings to comply with
CEC (in Canada), NEC (in U.S.A.) and/or local codes. Refer to
the Dimensions and Clearances Figure for installation location.
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.
Electrical line must be sized properly to carry the load. Each
unit must be wired with a separate branch circuit fed directly
from the meter panel and properly fused.
CAUTION: When connecting electrical power and control
wiring to the unit, waterproof type connectors
Unitary Products Group
MUST BE USED so that water or moisture cannot
be drawn into the unit during normal operation. The
above waterproofing conditions will also apply
when installing a field-supplied disconnect switch.
TABLE 2 - CONTROL WIRE SIZES
Wire Size1 AWG. Gauge
22
20
19
18
16
40
120
150
190
305
Maximum Wire Length2 Feet
Notes:
1. Solid, Class II copper wire
2. Based on a voltage drop of 1.2 volts per wire.
3. Total wire length is from unit to room thermostat, and back to unit
5
511.06-N3Y
Refer to the Typical Field Wiring Figure and to the appropriate
unit wiring diagram for control circuit and power wiring
information.
all the control sensors are factory mounted as part of the
"Factory installed" economizer option.
ENTHALPY SET POINT ADJUSTMENT
OPTIONAL ELECTRIC HEATERS
The factory installed heaters are wired for single point power
supply. Power supply need only be brought into the single point
terminal block and thermostat wiring to the low voltage terminal
strip located in the upper portion of the unit control box.
These ETL and CGA approved heaters are located within the
central compartment of the unit with the heater elements
extending into the supply air chamber. Refer to the Dimensions
and Clearances Figure for access panel location.
TABLE 3 - ELECTRIC HEAT APPLICATION DATA
NOMINAL
HEATER SIZE
(KW)
18
36
54
72
VOLTAGE
3 PHASE,
60 HZ
208/230,460,575
208/230,460,575
208/230
460, 575
208/230
460, 575
MINIMUM CFM
(UNIT SIZE)
15 TON
20 TON
4500
6000
4500
6000
5000
6000
4500
5000
6000
4500
Fuses are supplied, where required, by the factory. Some KW sizes
require fuses and others do not. Refer to the Electric Heat Application
table for minimum CFM limitations and to the Electrical Data table for
electrical data.
OPTIONAL ECONOMIZER/MOTORIZED DAMPER
RAIN HOOD
The instruction for the optional economizer/motorized damper
rain hood can be found in form 44-320-2. Use these instructions
when field assembling an economizer rain hood onto a unit.
The outdoor and return air dampers, the damper actuator, the
damper linkage, the outdoor and return air divider baffles, and
Remove the economizer access panel from the unit to check
the following adjustments. Loosen but do not remove the two
panel latches.
CAUTION: Extreme care must be exercised in turning both
the setpoint and minimum position adjusting
screws to prevent twisting them off.
1. The enthalpy set point may now be set by selecting the
desired setpoint shown in the Adjusting Enthalpy Setpoint
Figure. Adjust as follows:
• For a single enthalpy operation, carefully turn the set
point adjusting screw to the “A”, “B”, “C” or “D” setting
corresponding to the lettered curve.
• For a dual enthalpy operation, carefully turn the set point
adjusting screw fully clockwise past the “D” setting.
2. To check that the damper blades move smoothly without
binding, carefully turn the minimum position adjusting
screw fully clockwise and then energize and de-energize
terminals “R” to “G”. With terminals “R” to “G” energized,
turn the minimum position screw counterclockwise until the
desired minimum position has been attained.
3. Replace the economizer access panel. Reposition the two
latches horizontally and retighten the screws.
POWER EXHAUST/BAROMETRIC RELIEF DAMPER
AND RAIN HOOD OPTION
The instructions for the power exhaust/barometric relief
damper and rain hood can be found in form 44-320-10. The
exhaust fan, all supporting brackets, angles, and the wiring are
factory installed as part of the power exhaust option.
All of the components, including the dampers, hardware, and
mounting instructions are shipped in a single package external
from the unit. The hood must be field assembled and installed.
Power exhaust is not available as a field installed option.
6
Unitary Products Group
511.06-N3Y
FIG. 6 - ENTHALPY SETPOINT ADJUSTMENT
Unitary Products Group
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511.06-N3Y
TABLE 4 - PHYSICAL DATA
UNIT SIZE
15 TON 20 TON
SUPPLY AIR CENTRIFUGAL BLOWER (Dia. x Wd. in.) 15 x 15 18 x 15
BLOWER
FAN MOTOR HP
5
7.5
ROWS DEEP
4
4
INDOOR
FINS PER INCH
13
13
COIL
FACE AREA (Sq. Ft.)
15.5
20.5
PROPELLER DIA. (in.) (Each)
30
30
OUTDOOR
FANS
FAN MOTOR HP
(Each)
1
1
(Two Per Unit) NOM. CFM TOTAL
(Each)
6500
7200
ROWS DEEP
3
3
OUTDOOR
FINS PER INCH
15
15
COILS
FACE AREA (Sq. Ft.)
36.0
43.3
2
COMPRESSOR 7-1/2 TON TANDEM
(Qty. Per Unit) 10 TON TANDEM
2
QUANTITY PER UNIT (16" X 20" X 2")
4
QUANTITY PER UNIT (16" X 25" X 2")
4
AIR
FILTERS
QUANTITY PER UNIT (18" X 24" X 2")
5
TOTAL FACE AREA (sq. ft.)
15.0
20.0
20/8
24/0
REFRIGERANT 22 SYSTEM NO. 1
CHARGE
(lbs./oz.)
SYSTEM NO. 2
22/8
25/0
MODELS
8
OPERATING WEIGHTS (LBS.)
Basic Unit Heat Pump
Economizer
Economizer with
Power Exhaust
Motorized Damper
Options
18 KW
36 KW
Electric Heat
(Nominal KW) 54 KW
72 KW
Roof Curb
Accessories Barometric Damper
Wood Skid
15 TON 20 TON
2000
2200
160
245
150
25
30
35
40
175
45
200
185
45
220
Unitary Products Group
511.06-N3Y
RETURN AIR
SUPPLY AIR
OUTDOOR AIR
OUTDOOR AIR
(Economizer)
All dimensions are in inches. They are subject to change without notice. Certified dimensions will be provided upon request.
UTILITIES ENTRY DATA
HOLE
A
B
OPENING
SIZE
(DIA.)
1-1/8" KO
3/4" NPS (Fem.)
3-5/8" KO
3" NPS (Fem.)
USED FOR
Control
Wiring
Power
Wiring
Front
Bottom
Front
Bottom
DUCT COVERS - Units are shipped with the bottom
duct openings covered. An accessory flange kit is available for connecting side ducts.
For bottom duct applications:
1. Remove the side panels from the supply and return
air compartments to gain access to the bottom
supply and return air duct covers.
2. Remove and discard the bottom duct covers. (Duct
openings are closed with sheet metal covers except
when the unit includes a power exhaust option. The
covering consists of a heavy black paper composition.)
3. Replace the side supply and return air compartment
panels.
For side duct applications;
1. Replace the side panels on the supply and return air
compartments with the accessory flange kit panels.
2. Connect ductwork to the duct flanges on the rear of
the unit.
CLEARANCES
OUTDOOR SECTION
Front
INDOOR SECTION
Back
Left Side (Filter Access)
Right Side (Cond. Coil)
Below Unit1
Above Unit2
36"
24" (Less Economizer)
49" (With Economizer)
24" (Less Economizer)
36"3 (With Economizer)4
36"
20"
72" With 36" Maximum
Horizontal Overhang
(For Outdoor Air
Discharge Outlet)
NOTE: Unit and ductwork are approved for zero clearance to combustible
materials when equipped with electric heat.
1
Units (applicable in U.S.A. only) may be installed on combustible floors made
from wood or class A, B or C roof covering material.
Units must be installed oudoors. Overhanging structures or shrubs should
not obstruct outdoor air discharge outlet.
3
If economizer is factory installed, the assembled hood kit must be removed
prior to final installation. This hood is 54" long.
4
Remove hood kit prior to final installation.
2
DETAIL "X" (ACCESSORY SIDE SUPPLY AND RETURN AIR OPENINGS)
FIG. 7 - DIMENSIONS & CLEARANCES - 15 & 20 TON
Unitary Products Group
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511.06-N3Y
B
F
E
C
A
D
A
FRONT
C
FRONT
D
4 POINT LOADS
B
6 POINT LOADS
FIG. 8- FOUR AND SIX POINT LOADS
TABLE 5 - FOUR AND SIX POINT LOADS
UNIT
TOTAL
2,190
2,390
180
240
A
513
514
4 - POINT LOADS (LBS)
B
535
538
C
583
684
D
559
654
NOTE: These weights are with economizer and 36kW electric heat.
UNIT
180
240
TOTAL
2,190
2,390
A
342
343
B
358
359
6 - POINT LOADS (LBS)
C
D
373
388
407
456
E
372
436
F
357
389
NOTE: These weights are with economizer and 36kW electric heat.
10
Unitary Products Group
511.06-N3Y
TABLE 6 - SUPPLY AIR BLOWER PERFORMANCE (15 TON)
180 MBH - BOTTOM DUCT CONNECTIONS
BLOWER
SPEED,
(RPM)
MOTOR
PULLEY
(TURNS
OPEN)*
4500
ESP
BHP
CFM
6000
5250
6750
7200
KW
ESP
BHP
KW
ESP
BHP
KW
ESP
BHP
KW
ESP
BHP
KW
2.2
2.3
2.4
2.6
2.7
2.8
2.9
0.7
0.8
0.9
1.0
1.1
1.2
1.3
3.0
3.1
3.4
3.6
3.7
3.8
3.9
2.7
2.8
3.0
3.2
3.3
3.4
3.5
0.5
0.6
0.7
0.8
0.9
1.0
1.1
3.2
3.5
3.7
4.0
4.1
4.2
4.5
2.9
3.1
3.3
3.6
3.7
3.8
4.0
0.2
0.3
0.5
0.6
0.7
0.9
4.1
4.4
4.7
4.8
5.0
5.2
3.7
3.9
4.2
4.3
4.5
4.7
0.2
0.4
0.5
0.6
0.7
4.5
4.9
5.1
5.4
5.7
4.0
4.4
4.6
4.8
5.1
1.0
1.1
1.3
1.4
1.5
1.7
2.0
3.6
3.7
3.9
4.0
4.2
4.5
4.7
3.2
3.3
3.5
3.6
3.8
4.0
4.2
0.8
0.9
1.1
1.2
1.3
1.5
1.8
4.0
4.1
4.5
4.7
4.9
5.1
5.5
3.6
3.7
4.0
4.2
4.4
4.6
4.9
0.5
0.6
0.8
1.0
1.2
-
4.7
4.8
5.1
5.5
5.7
-
4.2
4.3
4.6
4.9
5.1
-
0.4
0.5
0.7
-
5.0
5.1
5.6
-
4.4
4.6
5.0
-
0.8
0.9
1.0
1.1
1.3
1.4
3.1
3.3
3.6
3.7
3.9
4.0
2.8
3.0
3.2
3.3
3.5
3.6
0.6
0.7
0.8
0.9
1.1
1.2
3.5
3.7
4.0
4.1
4.5
4.7
3.1
3.3
3.6
3.7
4.0
4.2
0.2
0.3
0.5
0.6
0.9
1.0
4.1
4.4
4.7
4.8
5.3
5.5
3.7
3.9
4.2
4.3
4.7
4.9
0.2
0.4
0.5
0.7
-
4.5
5.0
5.1
5.7
-
4.0
4.4
4.6
5.1
-
0.9
1.1
1.2
1.3
1.5
1.8
2.0
4.1
4.5
4.7
4.9
5.1
5.5
5.7
3.7
4.0
4.2
4.4
4.6
4.9
5.1
0.6
0.9
1.0
1.2
-
4.8
5.3
5.5
5.7
-
4.3
4.7
4.9
5.1
-
0.5
0.7
-
5.1
5.7
-
4.6
5.1
-
208 VOLT AND STANDARD DRIVE
850
870
915
965
980
1010
1040
6.0**
5.5
4.5
3.5
3.0
2.0
1.0
0.9
1.0
1.1
1.2
1.3
1.4
1.5
2.4
2.5
2.6
2.9
3.0
3.1
3.2
208 VOLT AND HIGH SPEED DRIVE ACCESSORY
965
980
1025
1065
1095
1130
1170
6.0
5.5
4.5
3.5
3.0
2.0
1.0
1.2
1.3
1.5
1.6
1.7
1.9
2.1
2.9
3.0
3.2
3.4
3.5
3.7
3.9
2.6
2.7
2.9
3.0
3.1
3.3
3.5
230/460/575 VOLT AND STANDARD DRIVE
870
915
965
980
1040
1065
6.0**
5.0
4.0
3.5
2.0
1.0
1.0
1.1
1.2
1.3
1.5
1.6
2.4
2.6
2.9
3.0
3.2
3.3
2.2
2.4
2.6
2.7
2.9
3.0
230/460/575 VOLT AND HIGH SPEED DRIVE ACCESSORY
980
1040
1065
1095
1130
1170
1190
6.0
4.5
4.0
3.5
2.5
1.5
1.0
1.3
1.5
1.6
1.7
1.9
2.1
2.2
2.9
3.2
3.4
3.5
3.7
3.9
4.0
2.6
2.9
3.0
3.1
3.3
3.5
3.6
1.1
1.3
1.4
1.5
1.7
2.0
2.1
3.7
3.9
4.0
4.2
4.5
4.7
4.8
3.3
3.5
3.6
3.8
4.0
4.2
4.3
NOTES: 1. Blower performance includes fixed outdoor air, 2" T/A filters, a dry indoor coil and no electric heat.
2. Refer to Page 12 for additional static resistances.
ESP = External Static Pressure available for the supply and return air duct system. All internal unit resistances have been deducted
from the total static pressure of the blower.
* Do NOT close the pulley below 1 turn open.
** Factory setting.
Unitary Products Group
11
511.06-N3Y
TABLE 7 - SUPPLY AIR BLOWER PERFORMANCE (20 TON)
240 MBH - BOTTOM DUCT CONNECTIONS
BLOWER
SPEED,
(RPM)
MOTOR
PULLEY
(TURNS
OPEN)*
6000
ESP
BHP
CFM
8000
7000
9000
9400
KW
ESP
BHP
KW
ESP
BHP
KW
ESP
BHP
KW
ESP
BHP
KW
1.8
2.7
3.4
3.9
4.5
5.0
0.1
0.5
0.9
1.1
1.4
1.7
2.3
3.5
4.5
5.1
5.8
6.5
2.0
2.9
3.8
4.3
4.9
5.5
0.2
0.6
0.8
1.2
1.5
3.8
4.9
5.5
6.3
7.0
3.2
4.1
4.6
5.3
5.9
0.1
0.4
0.7
1.0
5.1
5.9
6.9
7.7
4.3
5.0
5.8
6.5
0.2
0.6
7.3
8.2
6.1
6.9
1.1
1.4
1.7
1.8
1.9
2.0
2.1
2.2
5.1
5.8
6.3
6.5
6.8
7.0
7.2
7.3
4.3
4.9
5.3
5.5
5.7
5.9
6.0
6.1
0.8
1.2
1.5
1.6
1.7
1.8
1.9
2.1
5.5
6.3
6.9
7.1
7.4
7.6
7.8
7.9
4.6
5.3
5.8
6.0
6.2
6.4
6.6
6.7
0.4
0.7
1.0
1.1
1.2
1.3
1.5
-
5.9
6.9
7.5
7.8
8.1
8.3
8.6
-
5.0
5.8
6.3
6.6
6.8
7.0
7.2
-
0.2
0.5
0.6
0.7
-
7.3
7.9
8.3
8.6
-
6.1
6.7
7.0
7.3
-
0.1
0.5
0.9
1.1
1.4
1.7
1.8
2.3
3.5
4.5
5.1
5.8
6.5
6.6
2.0
2.9
3.8
4.3
4.9
5.5
5.6
0.2
0.6
0.8
1.2
1.5
1.6
3.8
4.9
5.5
6.3
7.0
7.3
3.2
4.1
4.6
5.3
5.9
6.1
0.1
0.4
0.7
1.0
1.1
5.1
5.9
6.9
7.7
7.9
4.3
5.0
5.8
6.5
6.7
0.2
0.6
0.7
7.3
8.2
8.6
6.1
6.9
7.3
0.8
1.2
1.5
1.7
1.8
1.9
2.1
2.2
5.5
6.3
7.0
7.4
7.6
7.8
7.9
8.1
4.6
5.3
5.9
6.2
6.4
6.6
6.7
6.8
0.4
0.7
1.0
1.2
1.3
1.5
-
5.9
6.9
7.7
8.1
8.3
8.6
-
5.0
5.8
6.5
6.8
7.0
7.2
-
0.2
0.6
0.7
-
7.3
8.2
8.6
-
6.1
6.9
7.3
-
208 VOLT AND STANDARD DRIVE
870
900
930
950
980
1015
6.0**
5.0
4.0
3.0
2.0
1.0
0.4
0.8
1.1
1.3
1.6
1.9
2.1
3.2
4.1
4.6
5.3
5.9
208 VOLT AND HIGH SPEED DRIVE ACCESSORY
950
980
1010
1020
1035
1050
1075
1100
6.0
5.0
4.0
3.5
3.0
2.5
2.0
1.0
1.3
1.6
1.8
1.9
2.0
2.1
2.3
2.4
4.6
5.3
5.8
6.1
6.2
6.4
6.6
6.7
3.9
4.5
4.9
5.1
5.2
5.4
5.5
5.6
230/460/575 VOLT AND STANDARD DRIVE
870
900
930
950
980
1015
1025
6.0**
5.0
4.0
3.5
2.5
1.5
1.0
0.4
0.8
1.1
1.3
1.6
1.9
2.0
2.1
3.2
4.1
4.6
5.3
5.9
6.1
1.8
2.7
3.4
3.9
4.5
5.0
5.1
230/460/575 VOLT AND HIGH SPEED DRIVE ACCESSORY
950
980
1015
1035
1050
1080
1100
1120
6.0
5.0
4.0
3.5
3.0
2.0
1.5
1.0
1.3
1.6
1.9
2.0
2.1
2.3
2.4
2.5
4.6
5.3
5.9
6.2
6.4
6.6
6.7
6.8
3.9
4.5
5.0
5.2
5.4
5.5
5.6
5.7
1.1
1.4
1.7
1.9
2.0
2.1
2.2
2.3
5.1
5.8
6.5
6.8
7.0
7.2
7.3
7.4
4.3
4.9
5.5
5.7
5.9
6.0
6.1
6.2
NOTES: 1. Blower performance includes fixed outdoor air, 2" T/A filters, a dry indoor coil and no electric heat.
2. Refer to Page 12 for additional static resistances.
ESP = External Static Pressure available for the supply and return air duct system. All internal unit resistances have been deducted
from the total static pressure of the blower.
* Do NOT close the pulley below 1 turn open.
** Factory setting.
12
Unitary Products Group
511.06-N3Y
TABLE 8 - STATIC RESISTANCES 1
EXTERNAL STATIC PRESSURE DROP
RESISTANCE, IWG
CFM
DESCRIPTION
15 TON
4500
6000
7200
6000
WET INDOOR COIL
0.1
0.1
0.1
0.1
18 KW
0.1
0.1
0.1
0.1
36 KW
0.1
0.2
0.3
0.1
ELECTRIC HEAT OPTIONS
54 KW
0.2
0.3
0.4
0.2
72 KW
0.2
0.4
0.6
0.2
ECONOMIZER OPTION
0.1
0.1
0.1
0.1
0.2
0.3
0.5
0.2
HORIZONTAL DUCT CONNECTIONS2
20 TON
8000
0.1
0.1
0.2
0.3
0.4
0.1
0.3
9400
0.1
0.1
0.3
0.4
0.6
0.1
0.5
1
Deduct these resistance values from the available external static pressures shown in the respective Blower Performance Table. (See Note 2 for exception.)
2
Since the resistance to air flow will be less for horizontal duct connections than for bottom duct connections, add these pressures to the ESP values on the
respective unit’s blower performance table.
TABLE 9 - POWER EXHAUST PERFORMANCE
CFM
KW
STATIC RESISTANCE OF RETURN DUCTWORK, IWG
0.3
0.4
0.5
CFM
KW
CFM
KW
CFM
KW
HIGH*
5250
0.83
4500
0.85
4200
0.88
3750
0.93
3000
0.99
MEDIUM
4900
0.77
3900
0.79
3500
0.82
2900
0.85
-
-
LOW
4400
0.72
3700
0.74
3000
0.78
-
-
-
-
MOTOR
SPEED
0.2
0.6
CFM
KW
*Factory Setting
Power Exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inherent protection.
TABLE 10 - BLOWER MOTOR AND DRIVE DATA
ADJUSTABLE MOTOR PULLEY
MOTOR1
BLOWER
MODEL
DRIVE RANGE
OUTSIDE PITCH
SIZE
BORE
(RPM) HP FRAME EFF. DESIGDIA.
DIA.
(IN.)
(%) NATION
(IN.)
(IN.)
Stan850/1065
dard
4.315 TON High
5
184T
83
1VP56
5.35
1-1/8
5.32
Speed 965/1190
Access
Stan870/1025
dard
5.520 TON High
7.5 213T
89
1VP68
6.75
1-3/8
6.52
Speed 950/1120
Access
BELT
(NOTCHED)
PITCH
OUTSIDE PITCH
BORE DESIGDESIGDIA.
LENGTH QTY.
DIA.
(IN.) NATION
NATION
(IN.)
(IN.)
(IN.)
FIXED BLOWER PULLEY
BK90
8.75
8.4
1
BX70
71.8
1
BK80
7.75
7.4
1
BX68
69.8
1
BK120
11.75
11.4 1-3/16 BX83
84.8
1
BK110
10.75
10.4 1-3/16 BX80
81.8
1
1
All motors have a nominal speed of 1800 RPM, a 1.15 service factor and a solid base. They can operate to the limit of their service factor because they are located in the moving air, upstream
of any heating device.
2
Do NOT close this pulley below 1 turn open.
Unitary Products Group
13
511.06-N3Y
TABLE 11 - ELECTRICAL DATA (BASIC UNITS)
COMPRESSORS
MODEL
#1
POWER
SUPPLY
#2
RLA LRA RLA LRA
B1CH180
B1CH240
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
28.2
14.1
11.5
33.3
19.2
12.8
260
128
104
300
146
124
28.2
14.1
11.5
33.3
19.2
12.8
260
128
104
300
146
124
SUPPLY AIR
BLOWER
MOTOR
OUTDOOR FAN
MOTORS
(#1 & #2)
HP
FLA
EACH
EACH
1
4.1/4.2
1
2.1
1
2.0
1
4.1/4.2
1
2.1
1
2.0
HP
FLA
MINIMUM
CIRCUIT
AMPACITY
(AMPS)
5
5
5
7.5
7.5
7.5
14.4/15.4
7.2
5.9
19.4/21.0
9.7
7.8
86.1/87.3
43.1
35.9
102.6/104.4
57.2
40.6
MAXIMUM
TIME DELAY
FUSE SIZE
(AMPS)
110
50
45
125
70
50
*Although these sizes are based on copper conductors, aluminum wire can be used.
Refer to the National Electric Code ( in U.S.A.) or the current Canadian Electrical Code
(in Canada) to determine the proper size.
POWER SUPPLY
VOLTAGE
LIMITATIONS**
208/230-3-60
460-3-60
575-3-60
VOLTAGE
MIN.
187
414
518
MAX.
253
506
630
**Rated in accordance with ARI Standard 110, utilization range "A".
TABLE 12 - ELECTRICAL DATA (UNITS w/SUPPLEMENTAL ELECTRIC HEAT)
HEATER OPTION
MODEL
B1CH
POWER
SUPPLY
208-3-60
180A25
230-3-60
180A46
460-3-60
180A58
575-3-60
208-3-60
240A25
230-3-60
240A46
460-3-60
240A58
575-3-60
1
MODEL
KW
STAGES
AMPS
E018
E036
E054
E072
E018
E036
E054
E072
E018
E036
E054
E072
E018
E036
E054
E072
E018
E036
E054
E072
E018
E036
E054
E072
E018
E036
E054
E072
E018
E036
E054
E072
13.5
27.0
40.6
54.1
18.0
36.0
54.0
72.0
18.0
36.0
54.0
72.0
18.0
36.0
54.0
72.0
13.5
27.0
40.6
54.1
18.0
36.0
54.0
72.0
18.0
36.0
54.0
72.0
18.0
36.0
54.0
72.0
1
2
2
2
1
2
2
2
1
2
2
2
1
2
2
2
1
2
2
2
1
2
2
2
1
2
2
2
1
2
2
2
37.5
75.1
112.6
150.1
43.3
86.6
129.9
173.2
21.7
43.3
65.0
86.6
17.3
34.6
52.0
69.3
37.5
75.1
112.6
150.1
43.3
86.6
129.9
173.2
21.7
43.3
65.0
86.6
17.3
34.6
52.0
69.3
MINIMUM
CIRCUIT
AMPACITY
(AMPS)
133.0
133.0
179.9
179.9
141.4
141.4
195.5
195.5
70.2
70.2
97.3
97.3
57.5
57.5
79.2
79.2
149.5
149.5
196.4
212.7
158.5
158.5
196.4
212.7
84.2
84.2
111.3
111.3
62.3
62.3
83.9
83.9
MAXIMUM
TIME DELAY
FUSE SIZE
(AMPS)
150
150
200
200
150
150
200
200
80
80
100
100
60
60
80
80
150
150
200
225
175
175
200
225
90
90
125
125
70
70
90
90
1
Electric Heat CORRECTION FACTORS:
2
NOMINAL VOLTAGE
208
240
480
600
14
VOLTAGE
208
230
460
575
KW CAP. MULTIPLIER
1.00
0.92
0.92
0.92
Although these sizes are based on copper conductors, aluminum wire can be used.
Refer to the National Electric code ( in U.S.A.) or the current Canadian Electrical Code
(in Canada) to determine the proper size.
Unitary Products Group
511.06-N3Y
OPERATION
COOLING SYSTEM
The unit has an air-c ooled cooling section and is
factory-charged with Refrigerant-22.
The compressors are hermetically sealed, internally sprung
and base-mounted with rubber-insulated hold-down bolts.
Compressors have inherent (internal) protection. If there is an
abnormal temperature rise in a compressor, the protector will
open to shut down the compressor.
PRELIMINARY OPERATION COOLING
After installation has been completed, energize the crankcase
heaters for at least four hours before operating the unit. After
the initial installation, the compressors should be given three
false starts (energized just long enough to make a few
revolutions) with 5-7 minutes delay between each start, before
being put into full time service.
NOTE: Prior to each cooling season, the crankcase heaters
must be energized at least 8 hours before system is
put into operation.
COOLING SEQUENCE OF OPERATION
NO OUTDOOR AIR OPTIONS - When the room thermostat
calls for "first-stage" cooling, the low voltage control circuit from
"R" to "G" and "Y1" is completed to energize compressor #1,
outdoor fan motor #1, outdoor fan motor #2 (if the ambient
temperature is above 60°F), and the supply air blower motor (if
the fan switch on the room thermostat is set in the "AUTO"
position).
When the thermostat calls for "second-stage" cooling, the low
voltage control circuit from "R" to "Y2" is completed to energize
compressor #2.
After the thermostat is satisfied and opens, all components will
stop simultaneously. The blower motor will continue to operate
if the fan switch on the room thermostat is set in the "ON"
position.
The reversing valve is energized thru the "Y1" circuit when the
subbase is in the cooling mode.
The suction line freezestat will cut the compressors out when
the suction line temperature drops below 26°F. This is and
automatic reset device.
ECONOMIZER WITH SINGLE ENTHALPY SENSOR - When
the room thermostat calls for "first-stage" cooling, the low
voltage control circuit from "R" to "G" and "Y1" is completed.
The "R" to "G" circuit energizes the blower motor (if the fan
switch on the room thermostat is set in the "AUTO" position)
and drives the economizer dampers from fully closed to their
minimum position. If the enthalpy of the outdoor air is below the
setpoint of the enthalpy controller (previously determined), "Y1"
energizes the economizer. The dampers will modulate to
maintain a constant supply air temperature as monitored by the
discharge air sensor. If the outdoor air enthalpy is above the
Unitary Products Group
setpoint, "Y1" energizes compressor #1, outdoor fan motor #1,
and outdoor fan motor #2 (if the ambient temperature is above
60°F).
When the thermostat calls for "second-stage" cooling, the low
voltage control circuit from "R" to "Y2" is completed. If the
enthalpy of the outdoor air is below the setpoint of the enthalpy
controller (i.e. first stage has energized the economizer), "Y2"
will energize compressor #1. If the outdoor air is above the
setpoint, "Y2" will energize compressor #2.
After the thermostat is satisfied and opens, all components will
stop simultaneously. The blower motor will continue to operate
if the fan switch on the room thermostat is set in the "ON"
position.
ECONOMIZER WITH DUAL ENTHALPY SENSORS - The
operation with the dual enthalpy sensors is identical to the
single sensor except that a second enthalpy sensor is mounted
in the return air. This return air sensor allows the economizer
to choose between outdoor air and return air, whichever has
the lowest enthalpy value, to provide maximum operating
efficiency.
ECONOM IZER (SINGLE OR DUAL) WITH POWER
EXHAUST - This system operates as specified above with one
addition. The power exhaust motor is energized whenever the
economizer is chosen by the enthalpy sensor for first stage
cooling, "Y1". As always, the "R" to "G" connection provides
minimum position but does not provide power exhaust
operation.
MOTORIZED OUTDOOR AIR DAMPERS - This system
operation is the same as the units with no outdoor air options
with one exception. When the "R" to "G" circuit is complete, the
motorized damper drives open to a position set by the
thumbwheel on the damper motor. When the "R" to "G" circuit
is opened, the damper spring returns fully closed.
HEATING SEQUENCE OF OPERATION
The following sequence of operation is based on using a
standard heat pump two-stage heating/two-stage cooling
thermostat/subbase. Economizer (if supplied) operation is not
allowed in the heating mode - however the minimum position
does operate.
FIRST STAGE HEAT
When the thermostat calls for “heating”, the low voltage control
circuit from “R” to “G” and “W1" (wiring schematic) is completed
to energize the compressors, outdoor fan motors and blower
motor (if subbase is set on auto) simultaneously. If the subbase
has the indoor fan set on ”on" the motor will run all of the time.
SECOND STAGE HEAT
If the compressors alone can not satisfy the heating
requirements, second stage heat will energize all the electric
heat (if supplied) thru the “W2" circuit.
15
511.06-N3Y
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 temperture within the
conditioned space. Refer to the Heat Anticipator Setting Table
for the required heat anticipator setting.
TABLE 13 - HEAT ANTICIPATOR SETTING
HEATER
KW
18
36
54
72
18
36
54
72
18
36
54
72
VOLTAGE
208/230-3-60
460-3-60
575-3-60
SETTING, AMPS
TH1
TH2
0.29
0.29
0.29
0.29
0.58
0.58
0.58
0.29
0.29
0.29
0.29
0.29
0.29
0.29
0.29
0.29
0.29
0.29
0.29
0.29
0.29
CHECKING SUPPLY AIR CFM
FIG.9 - BELT ADJUSTMENT
The RPM of the supply air blower will depend on the required
CFM, the unit options/accessories and the static resistances of
both the supply and the return air duct systems. With this
information, the RPM for the supply air blower and the motor
pulley adjustment (turns open) can be determined from the
Blower Performance Data Tables.
High speed drive accessories (containing a smaller blower
pulley and a shorter belt) are available for applications requiring
the supply air blower to produce higher CFM’s and/or higher
static pressures. Use Model 1LD0416 for 15 ton units and
Model 1LD0417 for 20 ton units. Refer to the Blower Motor and
Drive Data table.
Note the following:
1. The supply air CFM must be within the limitations shown in
Unit Application 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.
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:
4. Knowing the pressure drop across a dry coil, the actual
CFM through the unit and clean 2" filters, can be
determined from the curve in the figure below.
WARNING: Failure to properly adjust the total system air
quantity can result in extensive blower 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.
BELT DRIVE BLOWER
All units have belt drive single-speed blower motors. The
variable pitch pulley on the blower motor can be adjusted to
obtain the desired supply air CFM.
1. Remove the two 5/16" dot plugs from the blower motor and
the filter access panels shown in the Dimensions and
Clearances Figure.
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 indoor coil. Since the moisture on an indoor
coil may vary greatly, measuring the pressure drop across
a wet coil under field conditions would be inaccurate. To
assure a dry coil, the compressors whould be de-activated
while the test is being run.
16
FIG. 10 - PRESSURE DROP ACROSS A DRY INDOOR
COIL VS SUPPLY AIR CFM
Unitary Products Group
511.06-N3Y
DEFROST SEQUENCE OF OPERATION
LOCKOUT CONTROL
These heat pumps have a unique “ambient modified”
time-temperature defrost control that automatically adjusts to
changes in the outdoor temperature. The defrost control will
shorten the defrost initiation time periods above 35°F and will
extend the defrost initiation time periods below 35°F. The
control is factory set to defrost at 110 minutes (T3), but it can
be field adjusted to defrost at 80 minutes (T2) or 50 minutes
(T1) in areas with high humidity.
Any one of four conditions will put the system into a lock-out
condition during the heating or cooling mode:
The curve in the Deforst Initation Times Figure shows how defrost
initiation times are automatically compensated for changes in
outdoor temperature.
EXAMPLE: If the timer is factory set on pin T-3 (110 minutes at
35°F outdoor) and the outdoor temperature climbs to 45°, the
time initiation cycle will decrease to every 100 minutes.
1. The discharge line temperature reaches 255°F (215°F
reset) or,
2. The discharge pressure reaches 398 PSIG (310 PSIG
reset) or,
3. The suction line freezestat equals 26°F (38°F reset) or,
4. The low-pressure cut-out equals 7 PSIG (22 PSIG reset).
A lock-out will energize the emergency heat light on the
thermostat and the red LED light on the unit relay board. Turning
the thermostat switch to “Off” then back to “On”, will reset the
system.
NOTICE TO OWNER:
If the outdoor temperature drops to 10°F where ice is less likely
to form, the 110 minute interval will extend to every 150
minutes.
If a lockout occurs, check for the following problems before
calling a serviceman:
Two requirements must be met before a defrost cycle can be
initiated.
1. Dirty filters.
1. The defrost time cycle must be complete.
2. Snow accumulation.
2. The liquid line temperature must be less than 28°F.
3. Leaf or debris blockage.
Defrost will terminate when the liquid line sensor reaches 55°F
or after 10 minutes. If both or just one circuit defrosts, electric
heat is energized.
After eliminating the problem, attempt to restart the system as
follows:
The defrost time cycle will restart 10 minutes after the start of
the defrost cycle even though the liquid sensor terminated
defrost after 3 minutes.
During troubleshooting, the defrost time can be reduced to 20
seconds by shorting out the SW1 test pegs on the module. The
pegs are 1/2" long, 3/16" apart and are mounted on a white
base.
• turn the system switch on the thermostat to its “OFF” position
for 10 seconds.
• turn it back to its original position.
If the unit doesn’t start, call a serviceman.
NOTE: Models with an anti-recycle accessory will have a
5-minute delay before starting.
FIG. 11 - DEFROST INITIATION TIMES
Unitary Products Group
17
511.06-N3Y
T2 - 80 MINUTE SETTING
T3 - 110 MINUTE SETTING
(Factory Set Point)
T1 - 50 MINUTE SETTING
SHORTING PEGS TO
OVERRIDE TIMER
FOR SERVICE
MOVABLE JUMPER
WIRE TO CHANGE
DEFROST TIMER
FIG. 12 - AMBIENT MODIFIED TIME/TEMPERATURE CONTROL
SECURE OWNER’S APPROVAL: When the system is functioning properly, secure the owner’s approval. Show him the
location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature
settings within the limitations of the system.
MAINTENANCE
NORMAL MAINTENANCE
CAUTION: Prior to any of the following maintenance procedures, shut off all electric power to the unit to
prevent personal injury.
FILTERS - Inspect once a month. Replace disposable or clean
permanent type as necessary. DO NOT replace permanent
type with disposable. The dimensional size of the replacement
filter must be the same as the replaced filter.
If desired, every three years remove both pipe plugs at each
end shell and clean out any hardened grease or foreign matter.
Replace one plug on each end with a clean grease fitting. Using
a low pressure grease gun, pump grease (Chevron SRI-2 or
equivalent) into the bearing cavity until new grease shows at
the open port. Do not over lubricate. Run the motor for ten
minutes until excess grease is purged from the cavity. Replace
the plugs.
MOTORS
Outdoor fan motors are permanently lubricated and require no
maintenance.
Indoor Blower Motor and Drive - The indoor blower motor
features ball bearings that do not require periodic lubrication.
Periodic lubrication of the motor and bearings can extend the
life of components but is optional.
CAUTION: Damage can occur if the bearings are overlubricated. Use grease sparingly.
WARNING: Perform all maintenance operations on the blower
motor with electric power disconnected from the
unit. Do not attempt to lubricate bearings with the
unit in operation.
On an annual basis, check the motor for accumulations
of dust, etc. that may block the cooling slots in the motor
shell. Check for loose, damaged or misaligned drive
components. Check that all mounting bolts are tight. Replace
defective parts as required.
18
On 20 ton only, units are supplied with blower shaft bearings
that do not require maintenance but may be relubricated if
desired. Every three years, using a low pressure grease gun,
pump grease into the bearing grease fitting until grease just
begins to show at the seals. Do not over lubricate. Use any
lithium base grease recommended for ball bearing service.
OUTDOOR COIL - Dirt should not be allowed to accumulate
on the outdoor coil surface or other parts in the air circuit.
Cleaning should be as often as necessary to keep coil clean.
Use a brush, vacuum cleaner attachment, or other suitable
means. If water is used to clean coil, be sure electric power to
the unit is shut off prior to cleaning.
NOTE: Exercise care when cleaning the coil so that the coil
fins are not damaged.
Do not permit the hot outdoor air discharge to be
obstructed by overhanging structures of shrubs.
Unitary Products Group
511.06-N3Y
Unitary Products Group
19
5005 York Drive, Norman, OK 73069
Subject to change without notice. Printed in U.S.A
Copyright  by York International Corporation 2000. All Rights Reserved.
Code: SBY
511.06-N3Y
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