Carrier CHS072-121 User manual

CHS-072-121-01SI 2-23
Installation, Start-Up and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . 2
INSTALLATION GUIDELINE . . . . . . . . . . . . . . . . 3
Replacement /Retrofit — R-22 to R-410A
Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
• ACID TEST
• EVALUATE EXISTING REFRIGERANT PIPING
• INSTALLATION
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 1 — Plan for Unit Location . . . . . . . . . . . . 8
Step 2 — Complete Pre-Installation Checks . . 8
• CHECK UNIT ELECTRIC CHARACTERISTIC
• UNCRATE UNIT
• INSPECT SHIPMENT
• CONSIDER SYSTEM REQUIREMENTS
Step 3 — Prepare Unit Mounting Support . . . . 8
• SLAB MOUNT
Step 4 — Rig and Mount the Unit . . . . . . . . . . . 8
• RIGGING
Step 5 — Complete Refrigerant Piping
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Check Vertical Separation . . . . . . . . . . . . . . . . 10
Provide Safety Relief . . . . . . . . . . . . . . . . . . . . 10
Refrigerant Line Sizing . . . . . . . . . . . . . . . . . . . 10
Risers in Heat Pump Piping Systems . . . . . . . 10
• LIQUID LINE RISER
• VAPOR LINE RISER
Install Filter Drier and Moisture Indicator . . . . 10
Install Liquid Line Solenoid Valves . . . . . . . . . 11
Make Piping Connections . . . . . . . . . . . . . . . . 11
Evacuation/Dehydration . . . . . . . . . . . . . . . . . . 12
Preliminary Charge . . . . . . . . . . . . . . . . . . . . . . 12
Step 6 — Install Accessories . . . . . . . . . . . . . . 12
Step 7 — Complete Electrical Connections . . 12
• FIELD POWER SUPPLY
• UNITS WITHOUT FACTORY-INSTALLED
DISCONNECT
• UNITS WITH FACTORY-INSTALLED DISCONNECT
• ALL UNITS
• VOLTAGE AND CURRENT BALANCE
Convenience Outlets . . . . . . . . . . . . . . . . . . . . 14
Installing Weatherproof Cover . . . . . . . . . . . . 14
• FIELD CONTROL WIRING
• THERMOSTAT
• EXTERNAL CONTROL DEVICES
Step 8 — Wind Baffles for Low Ambient
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . 17
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Turn On Crankcase Heater . . . . . . . . . . . . . . . 17
Preliminary Charge . . . . . . . . . . . . . . . . . . . . . 17
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CHS Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
• PRELIMINARY CHECKS
• COMPRESSOR ROTATION
• COMPRESSOR OVERLOAD
• ADVANCED SCROLL TEMPERATURE PROTEC-
TION (ASTP)
• START UNIT
• ADJUST REFRIGERANT CHARGE
• FINAL CHECKS
OPERATING SEQUENCE . . . . . . . . . . . . . . . . . 21
Base Unit Controls . . . . . . . . . . . . . . . . . . . . . . 21
• INDOOR (SUPPLY) FAN
• COOLING, UNIT WITHOUT ECONOMIZER —
TWO-STAGE UNITS
• FAN CYCLING
• COOLING, UNIT WITH ECONOMIZER
• HEATING
• DEFROST CYCLE
• SUPPLEMENTAL HEAT/EMERGENCY HEAT
• COOLING AND HEATING SHUTDOWN
ROUTINE SYSTEM MAINTENANCE . . . . . . . . 23
Quarterly Inspection
(and 30 days after initial start) . . . . . . . . . . . 23
• INDOOR SECTION
• OUTDOOR SECTION
• ECONOMIZER OR OUTSIDE AIR DAMPER
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 23
Quarterly Inspection
(and 30 days after initial start) . . . . . . . . . . . 23
• INDOOR SECTION
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . 23
• AIR CONDITIONING
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Refrigeration System . . . . . . . . . . . . . . . . . . . . 24
• COMPRESSOR OIL
• SERVICING SYSTEMS ON ROOFS WITH
SYNTHETIC MATERIALS
• LIQUID LINE FILTER DRIER
• FIELD REFRIGERANT ACCESS PORTS
• OUTDOOR COIL METERING DEVICES
• REFRIGERANT SYSTEM PRESSURE ACCESS
PORTS
Compressor Protection . . . . . . . . . . . . . . . . . . 27
• COMPRESSOR OVERCURRENT
• COMPRESSOR OVERTEMPERATURE PROTEC-
TION (IP)
• CRANKCASE HEATER
• HIGH PRESSURE SWITCH
• LOSS OF CHARGE SWITCH
• OUTDOOR FAN MOTOR PROTECTION
• CONTROL CIRCUIT, 24-V
CHS072-121
Heat Pump Condensing Units
with R-410A Refrigerant

2Specifications subject to change without notice. CHS-072-121-01SI
Commercial Defrost Control . . . . . . . . . . . . . . 27
• REVERSING VALVE CONTROL
• COMPRESSOR CONTROL
• DEFROST
• DEFROST THERMOSTAT
• DEFROST SPEEDUP FUNCTIONS
COMFORT ALERT DIAGNOSTIC MODULE . . 31
Outdoor Fans . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
•FANMOTORS
• COMPRESSOR
Outdoor Coil Maintenance and Cleaning
Recommendation . . . . . . . . . . . . . . . . . . . . . 33
• REMOVE SURFACE LOADED FIBERS
• PERIODIC CLEAN WATER RINSE
• ROUTINE CLEANING OF INDOOR COIL SURFACES
FASTENER TORQUE VALUES . . . . . . . . . . . . 35
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . 36
APPENDIX A — AIR CONDITIONER AND
HEAT PUMP WITH R-410A —
QUICK REFERENCE GUIDE . . . . . . . . . . . . . 37
APPENDIX B — WIRING DIAGRAM LIST . . . . 37
APPENDIX C — LOW AMBIENT OPTION —
FACTORY INSTALLED . . . . . . . . . . . . . . . . . 45
START-UP CHECKLIST . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, main-
tenance, or use can cause explosion, fire, electrical shock
or other conditions which may cause personal injury or
property damage. Consult a qualified installer, service agen-
cy, or your distributor or branch for information or assis-
tance. The qualified installer or agency must use factory-
authorized kits or accessories when modifying this product.
Refer to the individual instructions package.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate na-
tional electrical codes (in USA, ANSI/NFPA70, National
Electrical Code (NEC); in Canada, CSA C22.1) for special
requirements.
It is important to recognize safety information. This is the
safety-alert symbol . When you see this symbol on the
unit and in instructions or manuals, be alert to the potential
for personal injury.
Understand the signal words DANGER, WARNING, CAU-
TION, and NOTE. These words are used with the safety-
alert symbol. DANGER identifies the most serious hazards
which will result in severe personal injury or death. WARN-
ING signifies hazards which could result in personal injury
or death. CAUTION is used to identify unsafe practices,
which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or
operation.
GENERAL
See Fig. 1 for unit dimensions and Table 2 for corner
weights. For physical data, see Tables 3-4. For model
number nomenclature, see Fig. 2.
Rated Indoor Airflow (cfm)
Table 1 below lists the rated indoor airflow used for the
AHRI efficiency rating for the units covered in this
document.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lock(s)
and lockout tag(s). Ensure electrical service to rooftop
unit agrees with voltage and amperage listed on the unit
rating plate. Unit may have more than one power switch.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures
than standard R-22 systems. Do not use R-22 service
equipment or components on R-410A refrigerant
equipment.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal injury
or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
CHS units.
Table 1 — CHS with FHX
MODEL NUMBERS FULL LOAD AIRFLOW (cfm)
CHS072*G/H - FHX072 2400
CHS091*M/N - FHX091 3000
CHS121*G/H - FHX120 3000

CHS-072-121-01SI Specifications subject to change without notice. 3
INSTALLATION GUIDELINE
Replacement /Retrofit — R-22 to R-410A Refrigerant
Split system heat pumps are intended to be installed with
matching indoor sections only. The CHS heat pump outdoor
units are matched only with same-size FHX indoor sections.
Existing R-22 indoor coils cannot be converted to R-410A
heat pump duty. Only the existing refrigerant piping is a can-
didate for retrofit use.
ACID TEST
If the existing system is being replaced because of a com-
pressor electrical failure, assume acid is in system. If sys-
tem is being replaced for any other reason, use an acid test
kit to determine acid level. If even low levels of acid are de-
tected, install a 100 percent activated alumina suction line
filter drier in addition to the replacement liquid-line filter drier.
Operate this system in COOLING ONLY. Remove the suc-
tion line filter drier as soon as possible, with a maximum of
72 hours of operation.
Recommendation: Install a ball valve in the liquid line at the
filter drier location when installing a suction filter in the suc-
tion line.
EVALUATE EXISTING REFRIGERANT PIPING
Reuse of existing refrigerant piping involves three issues:
quality (strength) of existing tubing, cleanliness and tube
size. R-410A operates at pressures that are 50 to 70% high-
er than the operating pressures in R-22 systems. It is im-
portant that the existing piping set be in excellent physical
condition to be considered suitable for re-use with R-410A.
If the physical condition of the existing piping set is not ex-
cellent, then remove the existing piping and replace with
new piping. Refer to Step 5 for a discussion on selecting
pipe sizes for these CHS heat pumps; refer to Table 5 for
recommended pipe sizes.
If the existing piping set is suitable for re-use with R-410A
based on its condition, determine the relative locations and
elevation differences between outdoor section (CHS) and
indoor section (FHX) and then check the sizes of the exist-
ing lines against the recommended pipe sizes in Table 5
and the MAXIMUM vapor riser pipe size use data in Table 6.
Do not use pipe sizes that exceed these maximum vapor
riser sizes as oil return at part load conditions in vertical ris-
es may be an issue. Replace any riser sections with re-
duced pipe sizes if existing pipe sizes exceed these maxi-
mum tube size limits.
INSTALLATION
1. Remove the existing evaporator coil or fan coil and
install the replacement coil.
2. Drain oil from low points and traps in vapor line tub-
ing if they were not replaced.
3. Remove the existing outdoor unit. Install the new out-
door unit according to these installation instructions.
4. Flush the interconnection piping system with dry
Nitrogen to eliminate as much trace of mineral oil as
possible.
5. Install the factory-supplied liquid-line filter drier at the
indoor coil just upstream of the TXV.
6. If required, install a 100% activated alumina suction
line filter drier at the outdoor unit.
7. Evacuate and charge the system according to the
instructions in this installation manual.
8. Operate the system for 10 hr. In COOLING MODE
ONLY. Monitor the pressure drop across the suction
line filter drier. If pressure drop exceeds 3 psig
(21 kPa), replace suction-line and liquid-line filter dri-
ers. Be sure to purge system with dry nitrogen and
evacuate when replacing filter driers. Continue to
monitor the pressure drop across suction-line filter
drier. Repeat filter changes is necessary. Never leave
suction-line filter drier in system longer than 72 hours
(actual time).
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never install suction-line filter drier in the liquid-line of a
R-410A system.

4Specifications subject to change without notice. CHS-072-121-01SI
Fig. 1 — CHS072-121 Unit Dimensions

CHS-072-121-01SI Specifications subject to change without notice. 5
Table 2 — CHS Corner Weights
UNIT
STD. UNIT
WT. CORNER A CORNER B CORNER C CORNER D CENTER OF GRAVITY UNIT HEIGHT
lb kg lb kg lb kg lb kg lb kg X Y Z H
CHS072 444 201 134 61 97 44 90 41 123 56 22 (558.8) 25 (635.0) 13 (330.2) 42-3/8 (1076.0)
CHS091 523 237 174 79 118 54 96 44 135 61 21 (533.4) 24 (609.6) 23 (584.2) 50-3/8 (1279.2)
CHS121 575 261 186 84 126 57 106 48 157 71 21 (533.4) 24 (609.6) 23 (584.2) 50-3/8 (1279.2)
Table 3 — Physical Data — CHS072-121 Units — 60 Hz English
UNIT CHS072*G/H CHS091*M/N CHS121*G/H
Nominal Capacity (tons) 67.510
Operating Weights (lb)
Aluminum-Fin Coils 444 523 575
Refrigeration Systema
NOTE(S):
a Unit is factory-supplied with partial charge only.
R-410A R-410A R-410A
No. Circuits / No. Comp. / Type 1 / 1 / Scroll 1 / 1 / Scroll 1 / 1 / Scroll
Shipping Charge A/B (lb) 9.0 R-410A 9.0 R-410A 9.0 R-410A
System Charge with Fan Coil A/B (lb)b
b Approximate system charge with 25 ft piping of sizes indicated with matched FHX.
18 26.2 27
Metering Device Acutrol™c
c Third-party trademarks and logos are the property of their respective owners.
Acutrol™Acutrol™
High-Press. Trip / Reset (psig) 630 / 505 630 / 505 630 / 505
Low-Press. Trip / Reset (psig) 27 / 44 27 / 44 27 / 44
Compressor
Oil Charge A/B (oz) 38 54 38 / 38
Speed (rpm) 3500 3500 3500
Outdoor Coil
Material Al/Cu Al/Cu Al/Cu
Coil Type RTPF RTPF RTPF
Rows / FPI 2 / 17 2 / 17 2 / 17
Total Face Area (ft2)17.5 28.1 28.1
Outdoor Fan / Motor
Qty / Motor Drive Type 2 / Direct 2 / Direct 2 / Direct
Motor HP / RPM 1/4 / 1100 1/4 / 1100 1/4 / 1100
Fan Diameter (in.) 22 22 22
Nominal Airflow (cfm) 6,000 6,000 6,000
Watts (total) 610 610 610
Piping Connections
Qty / Vapor (in. ODS) 1 / 1-1/8 1 / 1-1/8 1 / 1-3/8
Qty / Liquid (in. ODS) 1 / 3/8 1 / 1/2 1 / 1/2

6Specifications subject to change without notice. CHS-072-121-01SI
Table 4 — Physical Data — CHS072-121 Units — 60 Hz SI
UNIT CHS072*G/H CHS091*M/N CHS121*G/H
Nominal Capacity (kW) 21.1 26.4 35.1
Operating Weights (kg)
Aluminum-Fin Coils 201 237 261
Refrigeration Systema
NOTE(S):
a Unit is factory-supplied with partial charge only.
R-410A R-410A R-410A
No. Circuits / No. Comp. / Type 1 / 1 / Scroll 1 / 1 / Scroll 1 / 1 / Scroll
Shipping Charge A/B (kg) 4.1 R-410A 4.1 R-410A 4.1 R-410A
System Charge with Fan Coil A/B (kg)b
b Approximate system charge with 25 ft (7.62 m) piping of sizes indicated with matched FHX.
8.2 11.9 12.2
Metering Device Acutrol™Acutrol™Acutrol™
High-Press. Trip / Reset (kPa) 4344 / 3482 4344 / 3482 4344 / 3482
Low-Press. Trip / Reset (kPa) 186 / 303 186 / 303 186 / 303
Compressor
Oil Charge A/B (L) 1.1 1.6 1.1 / 1.1
Speed (r/s) 367 367 367
Outdoor Coil
Material Al/Cu Al/Cu Al/Cu
Coil Type RTPF RTPF RTPF
Rows / FPM 2 / 0.4 2 / 0.4 2 / 0.4
Total Face Area (sq. m) 1.6 2.6 2.6
Outdoor Fan / Motor
Qty / Motor Drive Type 2 / Direct 2 / Direct 2 / Direct
Motor HP / r/s 1/4 / 115 1/4 / 115 1/4 / 115
Fan Diameter (mm) 558.8 558.8 558.8
Nominal Airflow (l/s) 2831.7 2831.7 2831.7
Watts (total) 610 610 610
Piping Connections
Qty / Vapor (mm ODS) 1 / 28.6 1 / 28.6 1 / 34.9
Qty / Liquid (mm ODS) 1 / 9.5 1 / 12.7 1 / 12.7
LEGEND
ODS — Outside Diameter Sweat (socket)

CHS-072-121-01SI Specifications subject to change without notice. 7
Fig. 2 — Model Number Nomenclature
MODEL SERIES CHS07 2HGA0A0 0A
Position Number 1234567891011121314
C = R-410A Condensing Unit
H = Heat Pump Type
S = Standard ASHRAE 90.1-2016 Efficiency
072 = 6 Tons (1 circuit, 2-stage cooling)
091 = 7.5 Tons (1 circuit, 2-stage cooling)
121 = 10 Tons (1 circuit, 2-stage cooling) Nominal
Cooling Capacity
H = 208/230-3-60
L = 460-3-60
S = 575-3-60 Voltage
G = Single Circuit, 2 Stage¹
H = Single Circuit, 2 Stage with Low Ambient Control¹
M = Single Circuit, 2 Stage²
N = Single Circuit, 2 Stage with Low Ambient Control² Refrigerant System
Options
A = Al/Cu Round Tube Plate Fin (RTPF) Coil
B = Pre-Coated Al/Cu RTPF Coil
C = E-Coated Al/Cu RTPF Coil
M = Al/Cu RTPF Coil with Louvered Hail Guards
N = Pre-Coated Al/Cu RTPF Coil with Louvered Hail Guards
P = E-Coated Al/Cu RTPF Coil with Louvered Hail Guards Condenser Coil Options
0 = None
1 = Non-powered Convenience Outlet
2 = Powered Convenience Outlet Service Options
A = None
C = Non-Fused Disconnect Switch Electrical Options
0 = Standard Electromechanical Controls Base Unit Controls
0 = No options, reserved for future use Future Use
A = Standard
B = LTL Packaging
¹ Sizes 072 and 121 only.
² Sizes 091 only.

8Specifications subject to change without notice. CHS-072-121-01SI
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installa-
tion requirements.
2. Determine unit location (from project plans) or select
unit location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (pad, rails
or other) that provides for the minimum clearances required
for safety. This includes the clearance to combustible surfac-
es, unit performance and service access below, around and
above unit as specified in unit drawings. See Fig. 3.
Select a unit mounting system that provides adequate
height to allow for removal and disposal of frost and ice that
will form during the heating-defrost mode.
NOTE: Consider also the effect of adjacent units on airflow
performance and control box safety clearance.
Do not install the outdoor unit in an area where fresh air
supply to the outdoor coil may be restricted or when recircu-
lation from the condenser fan discharge is possible. Do not
locate the unit in a well or next to high walls.
Evaluate the path and required line length for interconnect-
ing refrigeration piping, including vapor riser requirements
and liquid line lift; a heat pump system will have one of each
type in opposite modes. Relocate sections to minimize the
length of interconnecting tubing.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto the
unit.
Fig. 3 — Service Clearance Dimensional Drawing
Step 2 — Complete Pre-Installation Checks
CHECK UNIT ELECTRIC CHARACTERISTIC
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data plate
agree with power supply provided.
UNCRATE UNIT
Remove unit packaging except for the top skid assembly,
which should be left in place until after the unit is rigged into
its final location.
INSPECT SHIPMENT
File a claim with shipping company if the shipment is dam-
aged or incomplete.
CONSIDER SYSTEM REQUIREMENTS
• Consult local building codes and National Electrical
Code (NEC, U.S.A.) for special installation require-
ments.
• Allow sufficient space for airflow clearance, wiring, re-
frigerant piping, and servicing unit. See Fig. 1 for unit
dimensions and weight distribution data.
• Locate the unit so that the outdoor coil (condenser)
airflow is unrestricted on all sides and above.
• The unit may be mounted on a level pad directly on
the base channels or mounted on raised pads at sup-
port points. See Tables 3 and 4 for unit operating
weights. See Fig. 1 for weight distribution based on
recommended support points.
NOTE: If vibration isolators are required for a particular
installation, use the data in Fig. 1 to make the proper
selection.
Step 3 — Prepare Unit Mounting Support
SLAB MOUNT
Provide a level concrete slab that extends a minimum of
6 in. (150 mm) beyond unit cabinet. Install a gravel apron in
front of condenser coil air inlet to prevent grass and foliage
from obstructing airflow.
Step 4 — Rig and Mount the Unit
RIGGING
These units are designed for overhead rigging. Refer to the
rigging label for preferred rigging method. Spreader bars are
not required if top crating is left on the unit. All panels must
be in place when rigging. As further protection for coil faces,
plywood sheets may be placed against the sides of the unit,
behind cables. Run cables to a central suspension point so
that the angle from the horizontal is not less than
45 degrees. Raise and set the unit down carefully.
If it is necessary to roll the unit into position, mount the unit
on longitudinal rails, using a minimum of 3 rollers. Apply
force to the rails, not the unit. If the unit is to be skidded into
position, place it on a large pad and drag it by the pad. Do
not apply any force to the unit.
Raise from above to lift the unit from the rails or pad when
unit is in its final position.
After the unit is in position, remove all shipping materials
and top crating.
Step 5 — Complete Refrigerant Piping
Connections
Refrigerant lines must be carefully designed and construct-
ed to ensure equipment reliability and efficiency. Line
length, pressure drop, compressor oil return, and vertical
separation are several of the design criteria that must be
evaluated. See Table 5.
IMPORTANT: DO NOT BURY REFRIGERATION LINES.
REAR:
Min 18" (457 mm)
required for service
RIGHT:
Min 18" (457 mm)
required for service
LEFT:
Min 18" (457 mm)
required for service
FRONT:
42” (1067 mm)
required for service
NOTE: Observe requirements for 39" (914 mm) operating
clearance on either Left or Rear coil opening.
IMPORTANT: Do not bury refrigerant piping underground.
IMPORTANT: A refrigerant receiver is not provided
with the unit. Do not install a receiver.

CHS-072-121-01SI Specifications subject to change without notice. 9
Table 5 — CHS072-121 Piping Recommendations (Single-Circuit Unit)a
NOTE(S):
a For applications with linear length greater than 100 ft (30.5 m), contact your local representative.
R-410A EQUIVALENT LENGTH (ft)
Model Nominal
Capacity
Length Linear 0-24 25-49 50-74 75-100
Length Equiv 0-37 38-74 75-112 113-150
CHS072*G/H
Liquid Line (in.) 3/8 3/8 3/8 1/2 3/8 1/2
Max Lift Cool 25 50 48 75 39 100
Max Lift Heat 25 50 48 60 31 60
Suction Line (in.) 7/8 7/8 1-1/8 1-1/8
Charge (lb) 17.8 18.8 20.3 22.6 21.4 24.5
CHS091*M/N
Liquid Line (in.) 1/2 1/2 1/2 1/2
Max Lift Cool 25 50 75 100
Max Lift Heat 25 50 50 60
Suction Line (in.) 7/8 1-1/8 1-1/8 1-1/8 1-1/8
Charge (lb) 23.9 26.0 27.9 29.8
CHS121*G/H
Liquid Line (in.) 1/2 1/2 1/2 1/2 5/8
Max Lift Cool 25 50 75 85 100
Max Lift Heat 25 50 60 60
Suction Line (in.) 7/8 1-1/8 1-1/8 1-1/8 1-1/8 1-3/8
Charge (lb) 26.8 28.8 30.7 33.4 37.2
LEGEND
Length Equiv — Equivalent tubing length, including effects of refrigeration
specialties devices
Liquid Line — Tubing size, inches OD
Max Lift Cool — Maximum liquid lift at maximum permitted liquid line pressure
drop Indoor unit ABOVE outdoor unit
Max Lift Heat — Maximum liquid lift at maximum permitted liquid line pressure
drop Indoor unit BELOW outdoor unit
Vapor Line — Tube size, inches OD
Charge — Charge Quantity, lb. Calculated for both liquid line sizes (where
applicable), but only with large suction line size (where
applicable)

10 Specifications subject to change without notice. CHS-072-121-01SI
Check Vertical Separation
If there is any vertical separation between the indoor and
outdoor units, check to ensure that the separation is within
allowable limits. Relocate equipment if necessary.
Provide Safety Relief
If local codes dictate an additional safety relief device, pur-
chase locally and install locally. Installation will require the
recovery of the factory shipping charge before the factory
tubing can be cut and the supplemental relief device is
installed.
Refrigerant Line Sizing
Consider the length of the piping required between the out-
door and indoor units. The maximum allowable line length is
100 ft (30.5 m). See Table 5. Refrigerant vapor piping
should be insulated.
Risers in Heat Pump Piping Systems
Elevation differences between the outdoor unit and the in-
door unit in heat pump systems will create two riser line con-
ditions – one in the liquid line in one mode and one in the
vapor line in the opposite mode. See the following table to
identify which lines are risers in this installation.
LIQUID LINE RISER
Refer to Piping Recommendations, Table 5; observe Max
Lift limits for liquid line according to unit mode, equivalent
line length and pipe size.
VAPOR LINE RISER
Refer to Table 6 for maximum pipe size in single pipe vapor
risers. All pipe size recommendations in Piping Recommen-
dations, Table 5, satisfy these maximum vapor line sizes. If
this installation is re-using existing piping, check the vapor
line sizes against these maximum values; replace riser sec-
tions with these pipe sizes if necessary.
Install Filter Drier and Moisture Indicator
Every unit MUST have a bi-directional filter drier in the liquid
line. Locate the filter drier(s) at the indoor unit, close to the
indoor coil’s thermostatic expansion valve (TXV) inlets. The
CHS units include one R-410A-duty filter drier, shipped in
cartons attached to the unit basepan. Remove the filter drier
and prepare to install in the liquid line at the indoor coil. Do
not remove connection fitting plugs until ready to connect
and braze the filter drier into the liquid line position. See
Table 7.
Installation of liquid line moisture indicating sight glass in
each circuit is recommended. Locate the sight glass(es) be-
tween the outlet of the filter drier and the TXV inlet.
Refer to Table 8 for recommendations on refrigeration
specialties.
Select the filter drier for maximum unit capacity and mini-
mum pressure drop. Complete the refrigerant piping from
the indoor unit to the outdoor unit before opening the liquid
and vapor service valves at the outdoor unit.
MODE
CHS UNIT
BELOW ID UNIT
CHS UNIT
ABOVE ID UNIT
Riser in Riser in
Cooling Liquid Vapor
(Suction Gas)
Heating Vapor
(Discharge Gas) Liquid
Table 6 — Maximum Vapor Line Sizes
CHS UNIT
CHS UNIT
BELOW ID UNIT
CHS UNIT
ABOVE ID UNIT
Max Diameter, Single Pipe (in.)
072*G/H 1-1/8 1-1/8
091*M/N 1-3/8 1-5/8
121*G/H 1-3/8 1-3/8
IMPORTANT: A refrigerant receiver is not provided
with the unit. Do not install a receiver.
Table 7 — R-410A-Duty Filter Drier(s)
UNIT QTY LIQUID
LINE OD
DESSICANT
VOLUME PART NO. REF.
CHS072*G/H 1 3/8 in. 8 cu. in. 1192338
CHS091*M/N 1 1/2 in. 16 cu. in. 1192276
CHS121*G/H 1 1/2 in. 16 cu. in. 1192276
Table 8 — Refrigerant Specialties Part Numbers
LIQUID LINE SIZE (in.) LIQUID LINE SOLENOID VALVE (LLSV) SOLENOID COIL SIGHT GLASS FILTER DRIER
3/8 1179871 plus 1183150 biflow kit 1179874 1179879 Provided with unit See
Table 7
1/2 1179872 plus 1183150 biflow kit 1179874 1179877
5/8 1179873 plus 1183150 biflow kit 1179874 1179878

CHS-072-121-01SI Specifications subject to change without notice. 11
Install Liquid Line Solenoid Valves
It is recommended that a bi-directional solenoid valve be
placed in the main liquid line (see Fig. 4 and 5) between the
outdoor unit and the indoor coil. Locate the solenoid valve at
the end of the liquid line, near the outdoor unit connections,
with flow direction arrow pointed at the outdoor unit. Refer to
Table 8. (A liquid line solenoid valve is required when the liq-
uid line length exceeds 75 ft [23 m].) This valve prevents re-
frigerant migration (which causes oil dilution) to the com-
pressor during the off cycle, at low outdoor ambient tem-
peratures. Wire the solenoid according to the unit label
diagram.
Fig. 4 — Location of Sight Glass(es) and Filter Driers
(typical CHS size 072 and 091)
Fig. 5 — Location of Sight Glass(es) and Filter Driers
(typical CHS size 121)
Make Piping Connections
Piping connections at the CHS unit are ball valves with stub
tube extensions. Do not open the unit service valves until all
interconnecting tube brazing as been completed.
The stub tube connections include 1/4 in. SAE service fit-
tings with Schrader valve cores (see Fig. 6). Before making
any brazed connections to the unit service valves, remove
both Schrader valve caps and cores and save for re-
installation. Connect a source for nitrogen to one of these
service fittings during tube brazing to prevent the formation
of copper oxides inside the tubes at brazed joints.
Fig. 6 — Typical Piping Connection Assembly
When connecting the field tubing to the CHS service valves,
wrap the valves in wet rags to prevent overheating
Pressure-test all joints from outdoor unit connections over to
the indoor coil, using nitrogen as pressure and with soap-
and-bubbles.
When pressure-testing is completed, remove the nitrogen
source at the outdoor unit service valves and re-install the
two Schrader valve cores. Torque the cores to 2-3 in.-lb
(23-34 N-cm).
Where vapor line is exposed to outdoor air, line must be in-
sulated. See Table 9 for insulation requirements.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Failure to use a solenoid valve relay (SVR) P/N 1178205
may cause overload of Comfort Alert Diagnostic Module
(CADM) and compressor alarm lock out.
LEGEND
TXV — Thermostatic Expansion Valve
15 Diams
Min 10
Diams 8 Diams
Min
Indoor
Coil CKT
Airflow
TXV
Sensing
Bulb
Equalizer Line
Sight Glass
A Location
TXV
Filter Drier
A Location
LEGEND
TXV — Thermostatic Expansion Valve
INDOOR
COIL CKT 2
AIRFLOW
INDOOR
COIL CKT 1
AIRFLOW
15 DIAMS
MIN 10
DIAMS
8 DIAMS
MIN
TXV
SENSING
BULB
EQUALIZER LINE
SIGHT GLASS
LOCATION
TXV
CKT 2
FILTER DRIE
R
LOCATION
TXV
SENSING
BULB
TXV
CKT 1
8 DIAMS
MIN
15 DIAMS
MIN 10
DIAMS
Table 9 — Insulation for Vapor Line Exposed to
Outdoor Conditions
LENGTH OF
EXPOSED VAPOR LINEa
NOTE(S):
a Recommended vapor line insulation for piping exposed to outdoor conditions
to prevent loss of heating during heating cycle. When vapor line goes through
interior spaces, insulation should be selected to prevent condensation on cool-
ing cycle. Heating capacity should be reduced 1000 Btuh (295 W) if over 35 ft
(11 m) of vapor line with 3/4 in. (19 mm) insulation is exposed to outdoor
conditions.
INSULATION THICKNESSb
b Closed cell foam insulation with a thermal conductivity of: 0.28 Btu • in./ft2• h • °F
(0.04 W/m • °C).
ft m in. mm
10 3 3/8 10
25 8 1/2 13
35 11 3/4 19
50 15 3/4 19
Factory
High-Flow
Access Port
Service Valve
with Stem Cap
Field Service
Access Port
(Schrader Core)
Sweat
Connection

12 Specifications subject to change without notice. CHS-072-121-01SI
Evacuation/Dehydration
Evacuate and dehydrate the connected refrigeration sys-
tem(s) (excluding the CHS unit) to 500 microns using a two-
stage vacuum pump attached to the service ports outside
the CHS service valves, following description in GTAC II,
Module 4, System Dehydration.
Preliminary Charge
Before starting the unit, charge R-410A liquid refrigerant into
the high side of each CHS circuit through the liquid service
valve(s). The amount of refrigerant added must be at least
80% of the operating charge listed in Table 5 for LINEAR
line length LESS the factory charge quantity (if factory ship-
ping charge has not been removed). See the following
example.
Allow high and low side pressures to equalize. If pressures
do not equalize readily, charge R-410A vapor (using special
service manifold with expansion device) into the vapor line
service port for the low side of system to assure charge in
the evaporator. Refer to GTAC II, Module 5, Charging,
Recover, Recycling, and Reclamation for liquid charging
procedures.
Example:
CHS*091
60 ft (18.3 m) linear line length
Equivalent line length 90 ft (27.4 m)
Liquid Lift: 20 ft (6.1 m)
Select line sizes from Table 5:
Liquid 1/2 in.
Vapor 1-1/8 in.
Charge 23.0 lb (at 75 ft linear length)
80% of Operating Charge:
0.80 x 23.0 = 17.6 lb
Factory Shipping Charge: 9 lb
Field-charge quantity: 17.6 lb – 9.0 lb = 8.6 lb
For linear line lengths longer than 100 ft (30.5 m), contact
your local representative for system charge value.
Step 6 — Install Accessories
Accessories requiring modifications to unit wiring should be
completed now. These accessories may include Winter
Start controls, Low Ambient controls, phase monitor, Com-
pressor Lockout. Refer to the instructions shipped with the
accessory. Additionally, for low ambient controls, refer to
Table 10.
Step 7 — Complete Electrical Connections
NOTE: Field-supplied wiring shall conform with the limita-
tions of minimum 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional Powered Convenience Outlet: The
power source leads to the convenience outlet’s transformer
primary are not factory connected. Installer must connect
these leads according to required operation of the conve-
nience outlet. If an always-energized convenience outlet op-
eration is desired, connect the source leads to the line side
of the unit-mounted disconnect. (Check with local codes to
ensure this method is acceptable in your area.) If a de-
energize via unit disconnect switch operation of the conve-
nience outlet is desired, connect the source leads to the
load side of the unit disconnect. On a unit without a unit-
mounted disconnect, connect the source leads to compres-
sor contactor C with unit field power leads.
Field power wires are connected to the unit at line-side
pressure lugs on compressor contactor C and TB1 (see wir-
ing diagram label for control box component arrangement)
or at factory-installed option non-fused disconnect switch.
Max wire size is no. 4 AWG (copper only).
NOTE: TEST LEADS — Unit may be equipped with short
leads (pigtails) on the field line connection points on contac-
tor C or optional disconnect switch. These leads are for fac-
tory run-test purposes only; remove and discard before con-
necting field power wires to unit connection points. Make
field power connections directly to line connection pressure
lugs only.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures
than standard R-22 systems. Do not use R-22 service
equipment or components on R-410A refrigerant
equipment.
IMPORTANT: Charge in Cooling mode only!
Table 10 — Minimum Outdoor Air Operating
Temperature
UNIT
PERCENT
COMPRESSOR
CAPACITY
MINIMUM OUTDOOR
TEMP, °F (°C)a
NOTE(S):
a Applies to Cooling mode of operation only.
Standard Unit Head Pressure
Controlb
b Wind baffles (field-supplied and field-installed) are recommended for all units
with low ambient head pressure control. Refer to Low Ambient Control Instal-
lation Instructions (shipped with accessory) for details.
CHS072*G/H 100 35 (1.7) –20 (–28.9)
CHS091*M/N 100 35 (1.7) –20 (–28.9)
CHS121*G/H 100 35 (1.7) –20 (–28.9)
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal inju-
ry or death.
Do not use gas piping as an electrical ground. Unit cabi-
net must have an uninterrupted, unbroken electrical
ground to minimize the possibility of personal injury if an
electrical fault should occur. This ground may consist of
electrical wire connected to unit ground lug in control
compartment, or conduit approved for electrical ground
when installed in accordance with NEC (National Electri-
cal Code); ANSI/NFPA 70, latest edition (in Canada, Ca-
nadian Electrical Code CSA [Canadian Standards Asso-
ciation] C22.1), and local electrical codes.

CHS-072-121-01SI Specifications subject to change without notice. 13
Fig. 7 — Disconnect Switch and Unit
UNITS WITHOUT FACTORY-INSTALLED DISCONNECT
When installing units, provide a disconnect switch per NEC
(National Electrical Code) of adequate size. Disconnect siz-
ing data is provided on the unit informative plate. Locate on
unit cabinet or within sight of the unit per national or local
codes. Do not cover unit informative plate if mounting the
disconnect on the unit cabinet.
UNITS WITH FACTORY-INSTALLED DISCONNECT
The factory-installed option disconnect switch is located in a
weatherproof enclosure located under the main control box.
The manual switch handle is accessible through an opening
in the access panel.
ALL UNITS
All field wiring must comply with NEC and all local codes.
Size wire based on MCA (Minimum Circuit Amps) on the
unit informative plate. See Fig. 8 for power wiring connec-
tions to the unit power terminal block and equipment
ground. Maximum wire size is no. 4 ga AWG per pole.
Provide a ground-fault and short-circuit over-current protec-
tion device (fuse or breaker) per NEC Article 440 (or local
codes). Refer to unit informative data plate for MOCP (Max-
imum Overcurrent Protection) device size.
Fig. 8 — Power Wiring Connections
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is to
be connected to a 208-v power supply, the control trans-
former must be rewired by moving the black wire with the
1/4 in. female spade connector from the 230-v connection
and moving it to the 208-v 1/4 in. male terminal on the pri-
mary side of the transformer. Refer to unit label diagram for
additional information.
All field wiring must comply with the NEC and local
requirements.
VOLTAGE AND CURRENT BALANCE
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 11. On 3-phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use the
formula shown below Table 11, Note d (see page 16) to de-
termine the percent of voltage imbalance. Operation on im-
proper line voltage or excessive phase imbalance consti-
tutes abuse and may cause damage to electrical compo-
nents. Such operation would invalidate any applicable unit
warranty.
WARNING
FIRE HAZARD
Failure to follow this warning could result in intermittent
operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and condensing unit. Use only copper wire. (See
Fig. 7.)
Copper
Wire Only
Electric
Disconnect
Switch
Aluminum
Wire
11 13
L1 L2 L3
C TB1
208/230-3-60
460-3-60
575-3-60
Units Without Disconnect Option
Units With Disconnect Option
2
4
6
1
3
5
L1
L2
L3
Optional
Disconnect
Switch
Disconnect factory test leads; discard.
Factory
Wiring
Disconnect
per
NEC

14 Specifications subject to change without notice. CHS-072-121-01SI
Convenience Outlets
Two types of convenience outlets are offered on CHS mod-
els: non-powered and unit-powered. Both types provide a
125-volt GFCI (ground-fault circuit-interrupter) duplex
receptacle rated at 15-A behind a hinged waterproof access
cover, located on the end panel of the unit. See Fig. 9.
Fig. 9 — Convenience Outlet Location
Non-powered type: This type requires the field installation of
a general-purpose 125-volt 15-A circuit powered from a
source elsewhere in the building. Observe national and lo-
cal codes when selecting wire size, fuse or breaker require-
ments and disconnect switch size and location. Route 125-v
power supply conductors into the bottom of the utility box
containing the duplex receptacle.
Unit-powered type: A unit-mounted transformer is factory-
installed to stepdown the main power supply voltage to the
unit to 115-v at the duplex receptacle. This option also in-
cludes a manual switch with fuse, located in a utility box and
mounted on a bracket behind the convenience outlet; access
is through the unit’s control box access panel. See Fig. 9.
The primary leads to the convenience outlet transformer are
not factory-connected. Selection of primary power source is
a customer-option. If local codes permit, the transformer pri-
mary leads can be connected at the line-side terminals on
the unit-mounted non-fused disconnect switch; this will pro-
vide service power to the unit when the unit disconnect
switch is open. Other connection methods will result in the
convenience outlet circuit being de-energized when the unit
disconnect switch is open. See Fig. 10.
Duty Cycle: The unit-powered convenience outlet has a
duty cycle limitation. The transformer is intended to provide
power on an intermittent basis for service tools, lamps, etc;
it is not intended to provide 15-amps loading for continuous
duty loads (such as electric heaters for overnight use). Ob-
serve a 50% limit on circuit loading above 8-amps (i.e., limit
loads exceeding 8-amps to 30 minutes of operation every
hour).
Fig. 10 — Powered Convenience Outlet Wiring
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing if
the GFCI receptacle does not trip as required. Press the
RESET button to clear the tripped condition.
Fuse on power type: The factory fuse is a Bussman™1
“Fusetron™”1T-15, non-renewable screw-in (Edison base)
type plug fuse.
Using unit-mounted convenience outlets: Units with unit-
mounted convenience outlet circuits will often require that
two disconnects be opened to de-energize all power to the
unit. Treat all units as electrically energized until the conve-
nience outlet power is also checked and de-energization is
confirmed. Observe National Electrical Code Article 210,
Branch Circuits, for use of convenience outlets.
Installing Weatherproof Cover
A weatherproof while-in-use cover for the factory installed
convenience outlets is now required by UL standards. This
cover cannot be factory mounted due its depth; it must be
installed at unit installation. For shipment, the convenience
outlet is covered with a blank cover plate.
The weatherproof cover kit is shipped in the unit’s control
box. The kit includes the hinged cover, a backing plate and
gasket.
DISCONNECT ALL POWER TO UNIT AND
CONVENIENCE OUTLET
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until ap-
proximately 1/2 in. (13 mm) under screw heads are ex-
posed. Press the gasket over the screw heads. Slip the
backing plate over the screw heads at the keyhole slots and
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal inju-
ry or death.
Units with convenience outlet circuits may use multiple
disconnects. Check convenience outlet for power status
before opining unit for service. Locate its disconnect
switch, if appropriate, and open it. Tag-out this switch, if
necessary.
Control Box
Access Panel
Pwd-CO
Transformer
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
1. Third-party trademarks and logos are the property of their respective
owners.
PRIMARY
CONNECTIONS
UNIT
VOLTAGE
208, 230
460
575
CONNECT
AS
240
480
600
L1: RED + YEL
L2: BLU + GRA
L1: RED
Splice BLU + YEL
L2: GRA
L1: RED
L2: GRA
TRANSFORMER
TERMINALS
H1 + H3
H2 + H4
H1
H2 + H3
H4
H1
H2

CHS-072-121-01SI Specifications subject to change without notice. 15
align with the gasket; tighten the two screws until snug (do
not overtighten).
Mount the weatherproof cover to the backing plate as
shown in Fig. 11. Remove two slot fillers in the bottom of the
cover to permit service tool cords to exit the cover. Check
for full closing and latching.
Fig. 11 — Weatherproof Cover Installation
NOTE: Check all factory and field electrical connections for
tightness.
FIELD CONTROL WIRING
CHS unit control voltage is 24 v. See Fig. A-G in Appendix B
for typical field control connections and the unit’s label dia-
gram for field-supplied wiring details. Route control wires to
the CHS unit through the opening in unit’s end panel to the
connections terminal board in the unit’s control box.
Remainder of the system controls connection will vary ac-
cording to the specific construction details of the indoor sec-
tion. Figure 12 depicts typical connections to a FHX fan coil
unit. Plan for field connections carefully and install control
wiring correctly per the project plan. Additional components
and supplemental transformer accessory may be required.
The CHS unit requires an external temperature control de-
vice. This device can be a field-supplied thermostat (field-
supplied) or a thermostatic emulation device provided as
part of a third-party Building Management System.
THERMOSTAT
Install a field-installed accessory thermostat according to in-
stallation instructions included with the accessory. For com-
plete economizer function, select a two-stage cooling ther-
mostat. CHS units require a two-stage thermostat.
CHS unit control system requires a conventional electric
thermostat that will energize the G terminal on a call for
Cool and Heat mode. Do not configure the thermostat a
heat pump type; Heat mode will not work with a thermostat
configured for heat pump.
Locate the field-installed thermostat accessory on a solid
wall in the conditioned space to sense average temperature
in accordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24-v pow-
er, use a thermostat cable or equivalent single leads of dif-
ferent colors with minimum of five leads between the CHS
unit’s outdoor unit connection board and the indoor unit con-
nection board. If the thermostat does not require a 24-v
source (no “C” connection required), use a thermostat cable
or equivalent with minimum of four leads. One additional
lead is required between the indoor unit connection board
and the thermostat for terminal G. If the accessory electric
heat is used, one additional wire is required between the in-
door unit connection board and the thermostat for terminal
W2. Check the thermostat installation instructions for addi-
tional features which might require additional conductors in
the cable.
NOTE: Two-stage units require an additional wire for the Y2
connection.
For wire runs up to 50 ft (15 m), use no. 18 AWG (American
Wire Gauge) insulated wire (35°C minimum). For 50 to 75 ft
(15 to 23 m), use no. 16 AWG insulated wire (35°C mini-
mum). For over 75 ft (23 m), use no. 14 AWG insulated wire
(35°C minimum). All wire sizes larger than no. 18 AWG can-
not be directly connected to the thermostat and will require
a junction box and splice at the thermostat.
Fig. 12 — Typical Remote Thermostat Connections
EXTERNAL CONTROL DEVICES
The CHS control transformers provide 24-v NEC Class 2
power sources to energize external control devices. These
devices will include the indoor fan motor contactor (or con-
trol relay or unit control board in the fan coil unit). These de-
vices may also include a liquid line solenoid valve, econo-
mizer control relay, supplemental electric heater contactors
or control relays and other devices selected by system
designer.
Control transformer TRAN1 provides control power through
terminal R to C on the CHS’s outdoor unit field connection
terminal strip for supply fan motor interlock. This source
may also be used to energize economizer control relay and
electric heater contactors or relays. Maximum available
power is 50 va. Check concurrent loadings by external con-
trol devices. If the maximum concurrent loading exceeds
50 va, purchase and install the accessory Transformer-
Relay package (available for 208/230 and 460-v units).
Control transformer TRAN2 provides control power through
terminal A1 (9) to C for the liquid line solenoid. Maximum
available power is 15 va. This output is switched ON/OFF
by the Solenoid Valve Relay (field-supplied, use
P/N 1178205).
Cover — While-In-Use
Weatherproof
Baseplate For
GFCI Receptacle
Gasket
GFCI Receptacle
Not Included
TOP
TOP
TOP
WET LOCA
TIONS
WETLOCATIONS
THERMOSTAT
R
G
Y1
O/B/Y2
W1
W2
C
REFER
TO FAN
COIL
LABEL
IN
CONTROL
BOX
OUTDOOR UNIT
CONNECTION
BOARD (TB)
R
Y1
Y2
W1
W2
G
C
X
A1
A2
1
2
3
4
5
6
7
8
9
10
HEAT PUMP INDOOR UNIT
ELECTRIC HEATER
TB2
W1
W2
C
H1
H2
HEAT PUMP INDOOR UNIT
WITH ELECTRIC HEATER
LLSV

16 Specifications subject to change without notice. CHS-072-121-01SI
Example: Supply voltage is 230-3-60
Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
Table 11 — Electrical Data — CHS072-121 60 Hz Unitsa,b
NOTE(S):
a In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit
shall be fuse. Canadian units may be fuse or circuit breaker.
b Motor RLA and LRA values are established in accordance with Underwriters Laboratories (UL) Standard 1995.
UNIT
NOMINAL
POWER
SUPPLYc,d
c The 575-v units are UL, Canada-listed only.
d Unbalanced 3-Phase Supply Voltage: Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the formula below to determine the
percentage of voltage imbalance.
VOLTAGE
RANGE
COMPRESSOR WITHOUT POWERED CONVENIENCE OUTLET
No. 1 No. 2 OFM (ea) Power Supply Disconnect Size
V-Ph-Hz Min Max RLA LRA RLA LRA Qty FLA MCAe
e The MCA values are calculated in accordance with The NEC. Article 440.
Fuse or
HACR
Brkr
FLA LRA
CHS072*G/H
208/230-3-60 187 253 17.5 136 — — 2 1.5 25/25 30/30 24/24 142/142
460-3-60 414 506 8.4 66 — — 2 0.8 13 20 12 70
575-3-60 518 633 6.3 55 — — 2 0.7 10 15 9 59
CHS091*M/N
208/230-3-60 187 253 27.4 164 — — 2 1.5 38/38 60/60 35/35 170/170
460-3-60 414 506 12.9 94 — — 2 0.8 18 30 17 98
575-3-60 518 633 10.0 65 — — 2 0.7 14 20 13 69
CHS121*G/H
208/230-3-60 187 253 15.9 110 15.6 110 2 1.5 39/39 50/50 40/40 226/226
460-3-60 414 506 7.7 52 7.7 52 2 0.8 19 25 20 108
575-3-60 518 633 5.7 39 5.8 39 2 0.7 15 20 15 82
UNIT
NOMINAL
POWER
SUPPLYc,d
VOLTAGE
RANGE
COMPRESSOR WITH POWERED CONVENIENCE OUTLET
No. 1 No. 2 OFM (ea) Power Supply Disconnect Size
V-Ph-Hz Min Max RLA LRA RLA LRA Qty FLA MCAe
Fuse or
HACR
Brkr
FLA LRA
CHS072*G/H
208/230-3-60 187 253 17.5 136 — — 2 1.5 30/30 45/45 29/29 147/147
460-3-60 414 506 8.4 66 — — 2 0.8 15 20 14 72
575-3-60 518 633 6.3 55 — — 2 0.7 11 15 11 61
CHS091*M/N
208/230-3-60 187 253 27.4 164 — — 2 1.5 43/43 60/60 40/40 175/175
460-3-60 414 506 12.9 94 — — 2 0.8 20 30 19 100
575-3-60 518 633 10.0 65 — — 2 0.7 16 25 15 71
CHS121*G/H
208/230-3-60 187 253 15.9 110 15.6 110 2 1.5 44/44 50/50 45/45 231/231
460-3-60 414 506 7.7 52 7.7 52 2 0.8 22 25 22 110
575-3-60 518 633 5.7 39 5.8 39 2 0.7 17 20 17 84
% Voltage
Imbalance = 100 x max voltage deviation from average voltage
average voltage
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage = (224 + 231 + 226) =681 = 227
33
% Voltage Imbalance = 100x 4= 1.78%
227
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
ABC
MOTOR
LEGEND
BRKR — Circuit Breaker
FLA — Full Load Amps
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps Protection
NEC — National Electrical Code
PWRD CO — Powered Convenience Outlet
RLA — Rated Load Amps
UNPWR CO — Unpowered Convenience Outlet

CHS-072-121-01SI Specifications subject to change without notice. 17
Step 8 — Wind Baffles for Low Ambient
Control
CHS****H and CHS****N units includes the factory installed
low ambient controller.
Units with low ambient control require the addition of wind
baffles to ensure full range low ambient operation. Material
data and dimensions for wind baffles are included in the
Appendix C section, Low Ambient Control, starting on
page 45. Fabricate the wind baffles and mount per
instructions.
PRE-START-UP
System Check
1. Check all indoor section and other equipment auxil-
iary components. Consult the manufacturer’s instruc-
tions regarding any other equipment connected to
the condensing unit. If the unit has field-installed
accessories, be sure all are properly installed and
correctly wired. If used, the airflow switch must be
properly installed.
2. Be sure the unit is properly leak checked and
dehydrated.
3. Check tightness of all electrical connections.
4. Open the liquid line and suction line service valves.
5. Be sure the unit is properly charged. See “Prelimi-
nary Charge”, below.
6. The electrical power source must agree with the
unit’s nameplate rating.
7. The crankcase heater must be firmly attached to the
compressor crankcase. Be sure the crankcase is
warm (heater must be on for 24 hours before starting
compressor).
Turn On Crankcase Heater
Turn on the crankcase heater for 24 hours before starting
the unit to be sure all the refrigerant is out of the oil. To ener-
gize the crankcase heater, proceed as follows:
1. Set the space thermostat set point above the space
temperature so there is no demand for cooling.
2. Close the field disconnect.
Preliminary Charge
Before starting the unit, charge liquid refrigerant into the
high side of the system through the liquid service valve. The
amount of refrigerant added must be at least 80% of the op-
erating charge listed in the Physical Data table (Tables 3
and 4 on page 5). Allow high and low side pressures to
equalize before starting compressor. If pressures do not
equalize readily, charge vapor on low side of system to
assure charge in the evaporator. Refer to GTAC II,
Module 5, Charging, Recover, Recycling, and Reclamation
for liquid charging procedures.
START-UP
CHS Units
The compressor crankcase heater must be on for 24 hours
before start-up. After the heater has been on for 24 hours,
the unit can be started. If no time elapsed since the prelimi-
nary charge step was completed, it is unnecessary to wait
the 24-hour period.
PRELIMINARY CHECKS
1. Check that electric power supply agrees with unit
nameplate data.
2. Verify that the compressor crankcase heater is
securely in place.
3. Check that the compressor crankcase heater has
been on at least 24 hours.
4. Recheck for leaks using the procedure outlined in the
Pre-Start-Up section, Leak Test and Dehydration. If
any leaks are detected, repair as required. Evacuate
and dehydrate as described in the Leak Test and
Dehydration section.
5. Ensure that the preliminary charge has been added
as described in the Pre-Start-Up section, Preliminary
Charge.
6. All internal wiring connections must be tight, and all
barriers and covers must be in place.
NOTE: The units are factory charged with the required
amount of oil. If recharging in required, use Emkarate®1
RL 32-3MAF.
COMPRESSOR ROTATION
On 3-phase units with scroll compressors, it is important to
be certain that the compressor is rotating in the proper di-
rection. The CHS units are equipped with a Comfort Alert
Diagnostic Module (CADM). Alert Code 7 indicates re-
verse power phasing.
To correct phase order:
1. Turn off power to the unit, tag disconnect.
2. Reverse any two of the unit power leads.
3. Reapply power to the compressor, verify correct
pressures.
To verify the compressor is rotating in the proper direction:
1. Connect service gauges to the suction and liquid
pressure fittings.
2. Energize the compressor.
3. The suction pressure should drop and the liquid pres-
sure should rise, as is normal on any start-up.
IMPORTANT: Before beginning Pre-Start-Up or Start-
Up, review Start-Up Checklist at the back of this book.
The Checklist assures proper start-up of a unit and
provides a record of unit condition, application
requirements, system information, and operation at
initial start-up.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Do not attempt to start the heat pump system, even
momentarily, until the following steps have been
completed. Compressor damage may result.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Prior to starting compressor, a preliminary charge of
refrigerant must be added to avoid possible compressor
damage.
1. Third-party trademarks and logos are the property of their respective
owners.

18 Specifications subject to change without notice. CHS-072-121-01SI
COMPRESSOR OVERLOAD
This overload interrupts power to the compressor when ei-
ther the current or internal motor winding temperature be-
comes excessive, and automatically resets when the inter-
nal temperature drops to a safe level. This overload may re-
quire up to 60 minutes (or longer) to reset. If the internal
overload is suspected of being open, disconnect the electri-
cal power to the unit and check the circuit through the over-
load with an ohmmeter or continuity tester.
ADVANCED SCROLL TEMPERATURE PROTECTION
(ASTP)
A label located above the terminal box identifies Cope-
land™1 Scroll compressor models that contain this technolo-
gy. See Fig. 13. Advanced Scroll Temperature Protection
(ASTP) is a form of internal discharge temperature protec-
tion, that unloads the scroll compressor when the internal
temperature reaches approximately 300°F. At this tempera-
ture, an internal bi-metal disk valve opens and causes the
scroll elements to separate, which stops compression.
Suction and discharge pressures balance while the motor
continues to run. The longer the compressor runs unloaded,
the longer it must cool before the bi-metal disk resets. See
Fig. 14.
Fig. 13 — Advanced Scroll Temperature Protection
Label
Fig. 14 — Recommended Minimum Cool-Down Time
After Compressor is Stopped
To manually reset ASTP, the compressor should be stopped
and allowed to cool. If the compressor is not stopped, the
motor will run until the motor protector trips, which occurs up
to 90 minutes later. Advanced Scroll Temperature Protec-
tion will reset automatically before the motor protector re-
sets, which may take up to 2 hours.
START UNIT
Disconnect the field low voltage lead at the CHS unit’s R ter-
minal to prevent compressor operation. Close the CHS dis-
connect switch. Only the crankcase heater will be
energized.
Reconnect the field low voltage lead to the CHS unit’s R ter-
minal. Adjust thermostat setting for Cool below space
temperature.
ADJUST REFRIGERANT CHARGE
The unit must be charged in Cooling mode only. Refer to
Cooling Charging Charts, Fig. 15-17. For applications with
line lengths greater than 100 ft, contact your representative.
Vary refrigerant until the conditions of the chart are met. The
charts are based on charging the units to the correct sub-
cooling for the various operating conditions. Accurate pres-
sure gauge and temperature sensing device are required.
Connect the pressure gauge to the service port on the liquid
line service valve. Mount the temperature sensing device on
the liquid line close to the liquid line service valve, and insu-
late it so that outdoor ambient temperature does not affect
the reading. Indoor airflow must be within the unit’s normal
operating range. Operate the unit for a minimum of 15 min-
utes. Ensure that pressure and temperature readings have
stabilized. Plot the liquid pressure and temperature on chart
and add or reduce the charge to meet the curve. Adjust the
charge to conform with the charging chart, using the liquid
pressure and temperature to read the chart.
FINAL CHECKS
Ensure that all safety controls are operating, control panel
covers are on, and the service panels are in place.
1. Third-party trademarks and logos are the property of their respective
owners.
0
10
20
30
40
50
60
70
80
90
100
110
120
0 10203040 607080 9050
Compressor Unloaded Run Time (Minutes)*
NOTES:
1 . Various factors, including high humidity, high ambient temperature,
and the presence of a sound blanket will increase cool-down times.
*Times are approximate.
Recommended Cooling Time*
(Minutes)
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Never charger liquid into the low-pressure side of the
system. Do not overcharge. During charging or removal
of refrigerant, be sure indoor-fan system is operating.
Ensure both outdoor fan motors are running; bypass any
low ambient function.

CHS-072-121-01SI Specifications subject to change without notice. 19
Fig. 15 — CHS072*G/H Charging Chart
350 700 1050 1400 1750 2100 2450 2800 3150 3500 3850
–6
0
6
12
18
24
30
36
42
48
54
60
20
40
60
80
100
120
140
50 100 150 200 250 300 350 400 450 500 550 600
Tem perature at Liquid Valve (°C / °F)
Pre ssure at Liquid Valve (PSIG / Kpa)
6 TON HEAT PUMP DUAL STAGE CHARGING CHART R-410A
(COMPRESSOR FULL LOAD, ALL CONDENSER FANS OPERATING)
Add Charge if
Above the Curve
Rem ove Charge if
Be low th e Cur ve
PN: 38AU000485 REV -

20 Specifications subject to change without notice. CHS-072-121-01SI
Fig. 16 — CHS091*M/N Charging Chart
350 700 1050 1400 1750 2100 2450 2800 3150 3500 3850
–6
0
6
12
18
24
30
36
42
48
54
60
20
40
60
80
100
120
140
50 100 150 200 250 300 350 400 450 500 550 600
Tem perature at Liquid Valve (°C / °F)
Pre ssure at Liquid Valve (PSIG / Kpa)
7.5 Ton Dual Stage Heat Pump Charging Chart R-410A
Refrigerant
Add Charge if
Above the Curve
Re m o ve Char ge if
Be low th e Cur ve
A
38AU000063