Arcoaire CHS180 User manual

Specifications are subject to change without notice. 506 01 2302 02 10/2019
INSTALLATION INSTRUCTIONS
R--410A Heat Pump Condensing Units
CHS180 -- 240
These instructions must be read and understood completely before attempting installation
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and NOTE
The signal words DANGER, WARNING,
CAUTION,andNOTE are used to identify levels of
hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate
hazard. The signal words WARNING,CAUTION,
and NOTE will be used on product labels and
throughout this manual and other manual that may
apply to the product.
DANGER -- Immediate hazards which will result in
severe personal injury or death.
WARNING --Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION -- Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE -- Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
!WARNING
Signal Words in Manuals
The signal word WARNING is used throughout
this manual in the following manner:
The signal word CAUTION is used throughout
this manual in the following manner:
!CAUTION
Signal Words on Product Labeling
Signal words are used in combination with
colors and/or pictures or product labels.
MODEL NOMENCLATURE 2....................
SAFETY CONSIDERATIONS 2..................
INSTALLATION GUIDELINE 3...................
INSTALLATION 8..............................
Step 1 -- Plan for Unit Location 8.................
Step 2 -- Complete Pre--Installation Checks 8......
Step3–PrepareUnitMountingSupport 9........
Step 4 -- Rig and Mount the Unit 9................
Step 5 -- Complete Refrigerant Piping Connections 9
Step 6 -- Install Accessories 13...................
Step 7 -- Complete Electrical Connections 13.......
PRE-START-UP 18..............................
START--UP 18..................................
OPERATING SEQUENCE 29.....................
ROUTINE SYSTEM MAINTENANCE 30...........
SERVICE 30...................................
TROUBLESHOOTING 42........................
START--UP CHECKLIST 51......................
TABLE OF CONTENTS
!WARNING
PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD
Failure to carefully read and follow this warning
could result in equipment malfunction, property
damage, personal injury and/or death.
Installation or repairs made by unqualified
persons could result in equipment malfunction,
property damage, personal injury and/or death.
The information contained in this manual is
intended for use by a qualified service technician
familiar with safety procedures and equipped
with proper tools and test instruments.
Installation must conform with local building
codes and with the national Electrical Code
NFPA70 current edition or Canadian Electrical
Code part 1 CSA C.22.1.

250601230202
Specifications are subject to change without notice.
MODEL NOMENCLATURE
MODEL SERIES C H S 1 8 0 H A A 0 A 0 0 A
Position Number 12345678910 11 12 13 14
C = R--410A Condensing Unit
A = Air Conditioning (Cooling Only)
H=HeatPump Type
S = Standard ASHRAE 90.1--2010 Efficiency Efficiency
180 = 180,000 BTUH = 15 Tons (2 circuit)
240 = 240,000 BTUH = 20 Tons (2 circuit)
Nominal Cooling Capacity
H = 208/230--3--60
L = 460--3--60
S = 575--3--60 Voltage
D=DualCircuit
E = Dual Circuit w/ Low Ambient Control
Refrigerant System Options
A = Cu/Al Cond. RTPF
Outdoor Coil Options
0=None
1 = Non--powered 115v Convenience Outlet Service Options
A=None
C = Non--Fused Disconnect Switch Electrical Options
0 = Standard Elec--Mechanical Control Base Unit Controls
0 = No options, reserved for future Use Future Use
A = Original Design Sales Digit
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal injury or
property damage. Consult a qualified installer, service
agency, or your distributor or branch for information or
assistance. The qualified installer or agency must use
factory--authorized kits or accessories when modifying this
product. Refer to the individual instructions packaged with
the kits or accessories when installing.
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
national electrical codes (in USA, ANSI/NFPA70, National
Electrical Code (NEC); in Canada, CSA C22.1) for special
requirements.
Recognize safety information. This is the safety--alert
symbol . When you see this symbol in instructions or manuals,
be alert to the potential for personal injury.
Understand the signal words DANGER,WARNING,
CAUTION, and NOTE. These words are used with the
safety--alert symbol. DANGER identifies the most serious
hazards which will result in serious injury or death. WARNING
signifies a hazard which could result in serious 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.
These instructions cover minimum requirements and conform
to existing national standards and safety codes. In some
instances, these instructions exceed certain local codes and
ordinances, especially those that may not have kept up with
changing residential construction practices. We require these
instructions as a minimum for a safe installation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lockout tag. Unit may have more than one power switch.
!WARNING
!

3
506 01 2302 02 Specifications are subject to change without notice.
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.
!WARNING
CUT HAZARD
Failure to follow this caution may result in damage
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
heat pump units.
CAUTION
!
INSTALLATION GUIDELINE
Replacement /Retrofit – R22 to R--410A
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 FHS indoor sections.
Existing R-22 indoor coils cannot be converted to R-410A
heat pump duty. Only the existing refrigerant piping is a
candidate for retrofit use.
Acid test – If the existing system is being replaced because
of a compressor electrical failure, assume acid is in system.
If system is being replaced for any other reason, use an
approved acid test kit to determine acid level. If even low
levels of acid are detected, 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 suction line filter drier as soon as
possible, with a maximum of 72 hr of operation.
Recommendation: Install a ball valve in the liquid line at the
filter drier location when installing a suction filter in the
suction line.
Installation –
1. Remove the existing evaporator coil or fan coil and in-
stall the replacement coil.
2. Drain oil from low points and traps in suction line tubing if
they were not replaced.
3. Remove the existing outdoor unit. Install the new outdoor
unit according to these installation instructions.
4. Install the factory-supplied liquid-line filter drier at the in-
door coil just upstream of the TXV.
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.
CAUTION
!
5. If required, install a 100% activated alumina suction line
filter drier at the outdoor unit.
6. Evacuate and charge the system according to the in-
structions in this installation manual.
7. Operate the system for 10 hours. Monitor the pressure
drop across the suction line filter drier. If pressure drop
exceeds 3 psig (21kPa), replace suction-line and li-
quid-line filter driers. Be sure to purge system with dry
nitrogen and evacuate when replacing filter driers.
Continue to monitor the pressure drop across suc-
tion-line filter drier. Repeat filter changes is necessary.
Never leave suction-line filter drier in system longer than
72 hr (actual time).

FIGURE 1 -- CHS180 DIMENSIONS
13-1/4
[338]
3-3/4
[95]
16-3/8
[418]
4-5/8
[117]
13-1/2
LEFT SIDE VIEW
SEE DETAIL A
1-3/8 [34.5] POWER ENTRY
WITH 50.0/58.0/65.0 MM K.O.
7/8 [22.2] FIELD
ENTRY SERVICE PORT
ELECTRICAL
DISCONNECT
LOCATION
1-3/4 [44.5]
GUAGE ACCESS
[344]
Y
X
45-1/8
[1148]
CG
CORNER "B"
CORNER "A" CORNER "D"
CORNER "C"
TOP VIEW
SUCTION CONNECTIONS
(SEE CHART FOR SIZE)
6-1/8
[155]
11-1/8
[282]
5-7/8
[149]
DETAIL A
(NOTE POSITION OF CKT 1)
CKT 2 HP CKT 1 HP
LIQUID CONNECTIONS
(SEE CHART FOR SIZE)
OPTIONAL
FACTORY
INSTALLED
DISCONNECT
Z
85
[2158]
86-3/8
[2193]
CG
COMPRESSOR
ACCESS PANEL
H
SERVICE VALVE CONNECTIONS
UNIT SUCTION LIQUID
38AUQ16 1-3/8 [34.9] 1/2 [12.7]
QTY
2 EA
CENTER OF GRAVITY
DIRECTION OF AIR FLOW
DIMENSIONS IN [ ] ARE IN MM
CG
NOTES:
1. MINIMUM CLEARANCE (LOCAL CODES OR JURISDICTION MAY
PREVAIL):
A. BOTTOM TO COMBUSTIBLE SURFACES: 0 INCHES.
B. OUTDOOR COIL, FOR PROPER AIR FLOW: 36 INCHES
ONE SIDE, 12 INCHES THE OTHER. THE SIDE GETTING THE
GREATER CLEARANCE IS OPTIONAL.
C. OVERHEAD: 60 INCHES, TO ASSURE PROPER OUTDOOR FAN
OPERATION.
D. BETWEEN UNITS: CONTROL BOX SIDE, 42 INCHES PER NEC.
E. BETWEEN UNIT AND UNGROUNDED SURFACES: CONTROL BOX
SIDE, 36 INCHES PER NEC.
F. BETWEEN UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES: CONTROL BOX SIDE, 42 INCHES PER NEC.
2. WITH EXCEPTION OF THE CLEARANCE FOR THE OUTDOOR
COIL AS STATED IN NOTE 1B, A REMOVABLE FENCE
OR BARRICADE REQUIRES NO CLEARANCE.
3. UNITS MAY BE INSTALLED ON COMBUSTIBLE FLOORS MADE
FROM WOOD OR CLASS A, B OR C ROOF COVERING MATERIAL.
C101281
450601230202
Specifications are subject to change without notice.
Unit
Std. Unit Weight Corner A Corner B Corner C Corner D Center of Gravity Unit Height
lbs. kg lbs. kg lbs. kg lbs. kg lbs. kg X Y Z H
CHS180 768 348 236 107 183 83 153 69 196 89 39 (991) 20 (508) 23 (584) 50---38 (1279)
Unit
Service Valve Connections
Suction Liquid QTY
CHS180 1---3/8 (34.9) 1/2 (12.7) 2ea

FIGURE 2 -- CHS240 DIMENSIONS
C101282
5
506 01 2302 02 Specifications are subject to change without notice.
Unit
Std. Unit Weight Corner A Corner B Corner C Corner D Center of Gravity Unit Height
lbs. kg lbs. kg lbs. kg lbs. kg lbs. kg X Y Z H
CHS240 1015 460 354 161 224 102 170 77 268 122 37 (940) 26 (660) 23 (584) 50---3/8 (1279)
Unit
Service Valve Connections
Suction Liquid QTY
CHS240 1---3/8 (34.9) 1/2 (12.7) 2ea

650601230202
Specifications are subject to change without notice.
Table 1A — Physical Data — CHS180--240 Units — 60 Hz English
UNIT SIZE CHS 180 240
NOMINAL CAPACITY (tons) 15 20
REFRIGERANT SYSTEM‡
Refrigerant R--410A
# Circuits / # Compressor / Type 2/2/Scroll 2/2/Scroll
Shipping Charge A/B (lb) 9.0/9.0 9.0/9.0
Operating Charge w/Fan Coil†A/B (lbs) 21/21 27/27
Metering Device Fixed Orifice
High--Pressure Trip / Reset (psig) 630 / 505 630 / 505
Low--Pressure Trip / Reset (psig) 27 / 44 27 / 44
COMPRESSOR
Model ZP83 (2) ZP103 (2)
Oil Charge A/B (oz) 60 110
Speed (RPM) 3500 3500
OUTDOOR COIL
Material Al/Cu
Coil Type Round Tube/Plate Fin (RTPF)
Rows/Fins Per Inch (FPI) 2/17
Total Face Area (ft2)47.1 50.1
OUTDOOR FAN / MOTOR
Qty / Motor Drive Type 3/Direct 4/Direct
Motor HP / RPM 1/4 / 1100 1/4 / 1100
Diameter (in) 22 22
Nominal Airflow (Cfm) 10,000 14,000
Watts (Total) 970 1150
Cut-in 44 544 5
PIPING CONNECTIONS (in. ODS)
Qty...Vapor 2...13/82...13/8
Qty...Liquid 2...1/22...1/2
LEGEND
ODS — Outside Diameter Sweat (socket)
† Approximate system charge with 25 ft piping of sizes indicated with matched FHS

7
506 01 2302 02 Specifications are subject to change without notice.
Table 1B — Physical Data — CHS180--240 Units — 60 Hz SI
UNIT SIZE CHS 180 240
NOMINAL CAPACITY (kW) 15 20
REFRIGERANT SYSTEM‡
Refrigerant R--410A
# Circuits / # Compressor / Type 2/2/Scroll 2/2/Scroll
Shipping Charge A/B (kg) 4.1/4.1 4.1/4.1
Operating Charge w/Fan Coil†A/B (kg) 9.5/9.5 12.2/12.2
Metering Device Fixed Orifice
High--Pressure Trip / Reset (kPa) 4344 / 3482 4344 / 3482
Low--Pressure Trip / Reset (kPa) 372 / 807 372 / 807
COMPRESSOR
Model ZP83 (2) ZP103 (2)
Oil Charge A/B (L) 1.7 3.2
Speed (r/s) 58 58
OUTDOOR COIL
Material Al/Cu
Coil Type Round Tube/Plate Fin (RTPF)
Rows/Fins Per Meter (Fins/m) 2/17
Total Face Area (m2)4.4 4.6
OUTDOOR FAN / MOTOR
Qty / Motor Drive Type 3/Direct 4/Direct
Motor HP / r/s 1/4 / 18 1/4 / 18
Diameter (mm) 559 559
Nominal Airflow (L/s) 4719 6607
Watts (Total) 970 1150
Cut-in 44 544 5
PIPING CONNECTIONS (mm ODS)
Qty / Vapor 2 / 34.9 2 / 34.9
Qty / Liquid 2 / 12.7 2 / 12.7
LEGEND
NEMA — National Electrical Manufacturers Association
ODS — Outside Diameter Sweat (socket)
† Approximate system charge with 7.6 m piping of sizes indicated with matched FHS

850601230202
Specifications are subject to change without notice.
.INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National Elec-
trical Code) ANSI/NFPA 70 for special installation
requirements.
2. Determine unit location (from project plans) or select unit
location.
3. Check for possible overhead obstructions which may in-
terfere 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 surfaces, 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
recirculation 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 interconnecting
refrigeration piping, including suction riser requirements
(outdoor unit above indoor unit), liquid line lift (outdoor unit
below indoor unit) and hot gas bypass line. Relocate
sections to minimize the length of interconnecting tubing.
DO NOT BURY REFRIGERATION LINES.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto the
unit.
LEFT:
Min 18” (457 mm)
requried for service
RIGHT:
Min 18” (457 mm)
requried for service
REAR:
Min 18” (457 mm)
requried for service
Note: Observe requirements for 39” (914 mm) operating clearance
on either Left or Rear coil opening.
FRONT:
42” (1067 mm)
FIGURE 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.
Un--crate 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
damaged or incomplete.
Consider System Requirements —
SConsult local building codes and National Electrical Code
(NEC, U.S.A.) for special installation requirements.
SAllow sufficient space for airflow clearance, wiring,
refrigerant piping, and servicing unit. See Figs. 1 and 2 for
unit dimensions and weight distribution data.
SLocate the unit so that the outdoor coil (condenser) airflow
is unrestricted on all sides and above.

9
506 01 2302 02 Specifications are subject to change without notice.
SThe unit may be mounted on a level pad directly on the
base channels or mounted on raised pads at support
points. See Tables 1A and 1B for unit operating weights.
SeeFigs.1and2forweightdistributionbasedon
recommended support points.
NOTE:If vibration isolators are required for a particular
installation,usethedatainFigs.1and2tomaketheproper
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
constructed 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 1.
IMPORTANT:Do not bury refrigerant piping
underground.
IMPORTANT:A refrigerant receiver is not
provided with the unit. Do not install a receiver.

10 50601230202
Specifications are subject to change without notice.
Table 1—CHS180--240 Piping Recommendations (Two-Circuit Unit)
R-410A Equivalent Length
Model
Nominal Capacity
Length Equiv 0-38 38-75 75-113 113-150 150-188
Length Lin 0-25 25-50 50-75 75-100 100-125
CHS180 Liquid Line 1/21/21/21/21/2
Max Lift
Cool 25 50 75 100 125
Heat 25 50 60 60 60
Vapor Line 11/811/811/811/811/8
Charge ea. (lbs) 20.9 22.8 24.8 26.6 28.6
CHS240 Liquid Line 1/21/25/81/25/85/85/8
Max Lift
Cool 25 37 50 24 51 48 63
Heat 25 50 50 60 60 60 60
Vapor Line 11/811/811/811/813/813/8
Charge ea. (lbs) 26.9 28.8 30.7 30.7 33.6 37.1 40.2
Legend:
Length Equiv Equivalent tubing length, including effects of refrigeration specialties devices
Linear Lin Typical linear tubing length, Feet (50% added to linear to define Equivalent Length for this table)
Liquid Line Tubing size, inches OD.
Max Lift Maximum liquid lift (indoor unit ABOVE outdoor unit only), at maximum permitted liquid line pressure drop —
SLinear Length Less than 100 ft: Minimum 2.0F subcooling entering TXV
SLinear Length Greater than 100 ft: Minimum 0.5F subcooling entering TXV
Vapor Line Tube size, inches OD
Charge Charge Quantity, lbs. Calculated for both liquid line sizes (where applicable), but only with larger suction line
size (where applicable)
NOTE: For applications with equivalent length greater than 188 ft (57 m) and/0r linear length greater than 125 ft (38
m), contact your local Carrier representative.
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,
purchase 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
outdoor and indoor units. The maximum allowable line length
is 100 ft (30.5 m). See Table 1. Refrigerant vapor piping
should be insulated.
Install Filter Driers and Moisture Indicators —
Every unit MUST have bi-directional filter driers in the liquid
lines. Locate the filter driers at the indoor unit, close to the
evaporator coil’s thermal expansion valve (TXV) inlets.
CHS units include two R--410A-duty filter driers, shipped in
cartons attached to the unit basepan. Remove the filter
driers and prepare to install in the liquid lines at the
evaporator coil. Do not remove connection fitting plugs until
ready to connect and braze the filter driers into the liquid line
positions See Table 2.
IMPORTANT:A refrigerant receiver is not
provided with the unit. Do not install a receiver.
Installation of liquid line moisture indicating sightglass in
each circuit is recommended. Locate the sightglass(es)
between the outlet of the filter drier and the TXV inlet.
Refer to Table 3 for recommendations on refrigeration
specialties.
Select the filter drier for maximum unit capacity and
minimum pressure drop. Complete the refrigerant piping
from the indoor unit to the outdoor unit before opening the
liquid and suction lines at the outdoor unit.

11
506 01 2302 02 Specifications are subject to change without notice.
Table 2—R--410A-duty Filter Drier(s)
Model-Size Qty
Liquid
Line OD
Desiccant
Volume
Part
Number Ref
CHS180 21/2-in 16 cu. in. KH43LS102
CHS240 21/2-in 16 cu. in. KH43LS102
Table 3—Refrigerant Specialties Part Numbers
LIQUID LINE
SIZE (in.)
LIQUID LINE
SOLENOID VALVE (LLSV)
SOLENOID
COIL
SIGHT
GLASS
FILTER
DRIER
1/21179872 plus 1183150 biflow kit 1179874 1179877 Provided with unit
SeeTable4
5/81179873 plus 1183150 biflow kit 1179874 1179878
Install Liquid Line Solenoid Valves —
It is recommended that bi-directional solenoid valves be
placed in the main liquids line for circuits 1 and 2 (see Fig. 4)
between the outdoor unit and the indoor coil. Locate the
solenoid valves at the end of the liquid lines, near the
outdoor unit connections, with flow direction arrow pointed at
the outdoor unit. Refer to Table 3. (A liquid line solenoid
valve is required when the liquid line length exceeds 75 ft [23
m].) This valve prevents refrigerant migration (which causes
oil dilution) to the compressor during the off cycle, at low
outdoor ambient temperatures. Wire the solenoid according
to the unit label diagram.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Failure to use a solenoid valve relay (SUR) accessory may
cause overload of Comfort Alert Diagnostic Module (CADM)
and compressor alarm lock out.
CAUTION
!
Capacity Control Liquid Line Solenoid Valve —
Evaporator capacity control via liquid solenoid valve is not
recommended for use with CHS models.
AIRFLOW
SUCTION
CIRCUIT 2
SUCTION
CIRCUIT 1
AIRFLOW
15 DIAMS
MIN 10
DIAMS
8 DIAMS
MIN
TXV
SENSING
BULB
EQUALIZER LINE
SIGHT
GLASSES
TXV
CKT 2
FILTER
DRIERS
TXV
SENSING
BULB
TXV
CKT 1
8 DIAMS
MIN
15 DIAMS
MIN 10
DIAMS
Dual Circuit Coil Piping Configuration
FIGURE 4 --Location of Sight Glasses and Filter Driers
Table 4—Minimum Outdoor Air Operating Temperature
UNIT
%
Compress
Ca
p
acit
y
MINIMUM OUTDOOR
TEMP — F (C)*
Standard Unit
Head Pressure
Control†
CHS180
100
35 (1.7) –20 (–28.9)
CHS240 35 (1.7) –20 (–28.9)
* Applies to Cooling mode of operation only.
† Wind baffles (field-supplied and field-installed) are recommended for all
units with low ambient head pressure control. Refer to Low Ambient
Control Installation Instructions (shipped with accessory) for details.

12 50601230202
Specifications are subject to change without notice.
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 -in SAE service fittings
with Schrader valve cores (see Fig. 5). 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.
Factory
High-Flow
A
ccess Port
Service Valve
with Stem Cap
Field Service
Access Port
(Schrader core)
Sweat
Connection
FIGURE 5 -- Typical Piping Connection Assy.
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-lbs
(23-34 N-cm).
Where vapor line is exposed to outdoor air, line must be
insulated. See Table 5 for insulation requirements.
Table 5—Insulation for Vapor Line Exposed
to Outdoor Conditions
LENGTH OF EXPOSED
VAPOR LINE* INSULATION THICKNESS†
ft min. mm
10 33/810
25 81/213
35 11 3/419
50 15 3/419
* Recommended vapor line insulation for piping exposed to outdoor condi-
tions to prevent loss of heating during heating cycle. When vapor line
goes through interior spaces, insulation should be selected to prevent
condensation on cooling cycle. Heating capacity should be reduced
1000 Btuh (295 W) if over 35 ft (11 m) of vapor line with 3/4in. (19 mm)
insulation is exposed to outdoor conditions.
† Closed cell foam insulation with a thermal conductivity of: 0.28 Btu S
in./ft2ShSF(0.04W/mSC).
Evacuation/Dehydration —
Evacuate and dehydrate the connected refrigeration
system(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.
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
IMPORTANT:Charge in Cooling mode only!
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 1 for LINEAR line
length LESS the factory charge quantity (if factory shipping
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 suction 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:
CHS240
60-ft (18.3 m) linear line length
Equivalent line length 90-ft (27.4 m)
CoolingLiquidLift:20-ft(6.1m)
Select line sizes from Table 2 (CHS):
Liquid 1/2--in (provides liquid lift to 24--ft (7.3 m))
Vapor 1-1/8in.
Charge (each circuit):
1/2--in liquid line: 30.7 lbs (at 75-ft linear length)
80% of Operating Charge:
0.80 x 30.7 = 24.6 lbs
Factory Shipping Charge: 9 lbs
Field-Charge (each circuit):
24.6 -- 9.0 = 15.6 lbs
For linear line lengths longer than 125 ft (38.1 m), contact
your local representative for system charge value.

13
506 01 2302 02 Specifications are subject to change without notice.
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, Compressor
LOCout. Refer to the instructions shipped with the
accessory.
Step 7 — Complete Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit cabinet
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 Electrical Code); ANSI/NFPA
70, latest edition (in Canada, Canadian Electrical Code CSA
[Canadian Standards Association] C22.1), and local electrical
codes.
!WARNING
NOTE:Check all factory and field electrical connections for
tightness. Field-supplied wiring shall conform with the
limitations of 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
convenience outlet. If an always-energized convenience
outlet operation 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
convenience 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
compressor contactor C and indoor fan contactor IFC
pressure lugs with unit field power leads.
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
transformer 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 primary side of the transformer. Refer to unit label
diagram for additional information.
Field power wires are connected to the unit at line-side
pressure lugs on compressor contactor C and TB1 (see wiring
diagram label for control box component arrangement) or at
factory-installed option non-fused disconnect switch. Max wire
size is #4 AWG (copper only).
NOTE:TEST LEADS - Unit may be equipped with short leads
(pigtails) on the field line connection points on contactor C or
optional disconnect switch. These leads are for factory
run-test purposes only; remove and discard before
connecting field power wires to unit connection points. Make
field power connections directly to line connection pressure
lugs only.
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. 6.)
!WARNING
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
FIGURE 6 -- 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
sizing 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. 7 for power wiring connections to
the unit power terminal block and equipment ground. Maximum
wire size is #4 ga AWG per pole.
Provide a ground-fault and short-circuit over-current
protection device (fuse or breaker) per NEC Article 440 (or
local codes). Refer to unit informative data plate for MOCP
(Maximum Over-current Protection) device size.

14 50601230202
Specifications are subject to change without notice.
11 13
L1 L2 L3
CTB1
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
FIGURE 7 -- Power Wiring Connections
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
6. On 3-phase units, voltages between phases must be
balanced within 2% and the current within 10%. Use the
formula shown in the legend for Table 6, Note 5 to determine
the percent of voltage imbalance. Operation on improper line
voltage or excessive phase imbalance constitutes abuse and
may cause damage to electrical components. Such
operation would invalidate any applicable warranty.
Convenience Outlets
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury 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.
!WARNING
Two types of convenience outlets are offered on CHS
models: 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. 10.
Control Box
Access Panel
Pwd-CO
Transformer
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
FIGURE 8 -- 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 local
codes when selecting wire size, fuse or breaker
requirements 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
includes 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. 8.
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
primary leads can be connected at the line-side terminals on
the unit-mounted non-fused disconnect or HACR breaker
switch; this will provide service power to the unit when the
unit disconnect switch or HACR switch is open. Other
connection methods will result in the convenience outlet
circuit being de-energized when the unit disconnect or HACR
switch is open. See Fig. 9.
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).
Observe a 50% limit on circuit loading above 8-amps (i.e.,
limit loads exceeding 8-amps to 30 minutes of operation
every hour).
TesttheGFCIreceptaclebypressingtheTESTbuttonon
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.

15
506 01 2302 02 Specifications are subject to change without notice.
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T-15, non-renewable screw-in (Edison base) type
plug fuse.
Using unit-mounted convenience outlets: Units with
unit-mounded 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
convenience outlet power is also checked and
de-energization is confirmed. Observe National Electrical
Code Article 210, Branch Circuits, for use of convenience
outlets.
FIGURE 9 -- Powered Convenience Outlet Wiring
UNIT
VOLTAGE
CONNECT
AS
PRIMARY
CONNECTIONS
TRANSFORMER
TERMINALS
208,
230 240
L1: RED + YEL
L2: BLU + GRA
H1 + H3
H2 + H4
460 480
L1: RED
Splice BLU +YEL
L2: GRA
H1
H2 + H3
H4
575 600 L1: RED
L2: GRA
H1
H2
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
approximately 1/2in (13 mm) under screw heads are
exposed. Press the gasket over the screw heads. Slip the
backing plate over the screw heads at the keyhole slots and
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. 10. 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.
RECEPTACLE
NOT INCLUDED
COVER – WHILE-IN-USE
WEATHERPROOF
BASE PLATE FOR
GFCI RECEPTACLE
FIGURE 10 -- Weatherproof Cover Installation
All Units —
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See Table
7. On 3-phase units, voltages between phases must be
balanced within 2% and the current within 10%. Use the
formula shown in the legend for Table 7, Note 5 (see pages
14) to determine the percent of voltage imbalance. Operation
on improper line voltage or excessive phase imbalance
constitutes abuse and may cause damage to electrical
components. Such operation would invalidate any applicable
warranty.
Field Control Wiring —
CHS unit control voltage is 24 v. See Fig. 18 for typical field
control connections and the unit’s label diagram 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
according to the specific construction details of the indoor
section. Fig. 11 depicts typical connections to a FHS 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
device. This device can be a thermostat (field-supplied) or a
thermostat emulation device provided as part of a third--party
Building Management System.
Thermostat —
Install an approved accessory thermostat according to
installation instructions included with the accessory. For
complete economizer function, select a two—stage cooling
thermostat. Locate the thermostat accessory on a solid wall

16 50601230202
Specifications are subject to change without notice.
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 power,
use a thermostat cable or equivalent single leads of different
colors with minimum of five leads. 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.
Check the thermostat installation instructions for additional
features which might require additional conductors in the
cable.
Forwirerunsupto50ft.(15m),useno.18AWG(American
Wire Gage) insulated wire (35C minimum). For 50 to 75 ft.
(15 to 23 m), use no. 16 AWG insulated wire (35C
minimum). For over 75 ft. (23 m), use no. 14 AWG insulated
wire (35C minimum). All wire sizes larger than no. 18 AWG
cannot be directly connected to the thermostat and will
require a junction box and splice at the thermostat.
Note 1: Typical multi-function marking. Follow manufacturer’s configuration
instructions to select Y2.
Note 2: Connect only if thermostat requires 24-vac power source.
Note 3: Connect W1 and W2 if supplemental heaters are installed
Field Wiring
(Note 1)
(Note 2)
(Note 3)
(Note 3)
FIGURE 11 -- Typical Remote Thermostat Connections

17
506 01 2302 02 Specifications are subject to change without notice.
Table 6—Electrical Data — CHS180--240 60 Hz Units
UNIT
SIZE
CHS
NOMINAL
POWER
SUPPLY
VOLTAGE
RANGE
COMPRESSOR NO C.O. or UNPWRD C.O.
No. 1 No. 2 OFM POWER SUPPLY DISCONNECT SIZE
V--Ph--Hz Min Max RLA LRA RLA LRA Qty
FLA
(ea) MCA
FUSE or
HACR
BRKR FLA LRA
180
208/230--3--60 187 253 25.0 164 25.0 164 31.5 60.8/60.8 80/80 63/63 337/337
460--3--60 414 506 12.2 100 12.2 100 30.8 29.9 40 31 206
575--3--60 518 633 9.7 78 9.7 78 30.7 23.9 30 2162
240
208/230--3--60 187 253 30.1 225 30.1 225 41.5 73.7/73.7 100/100 76/76 462/462
460--3--60 414 506 16.7 114 16.7 114 40.8 40.8 50 42 236
575--3--60 518 633 12.2 80 12.2 80 40.7 30.3 40 31 168
UNIT
SIZE
CHS
NOMINAL
POWER
SUPPLY
VOLTAGE
RANGE
COMPRESSOR w/ PWRD C.O.
No. 1 No. 2 OFM POWER SUPPLY DISCONNECT SIZE
V--Ph--Hz Min Max RLA LRA RLA LRA Qty
FLA
(ea) MCA
FUSE or
HACR
BRKR FLA LRA
180
208/230--3--60 187 253 25.0 164 25.0 164 31.5 65.6/65.6 90/90 68/68 342/342
460--3--60 414 506 12.2 100 12.2 100 30.8 32.1 40 33 208
575--3--60 518 633 9.7 78 9.7 78 30.7 25.6 30 27 164
240
208/230--3--60 187 253 30.1 225 30.1 225 41.5 78.5/78.5 100/100 82/82 467/467
460--3--60 414 506 16.7 114 16.7 114 40.8 43 50 45 238
575--3--60 518 633 12.2 80 12.2 80 40.7 32 40 33 170
Legend and Notes for Table 6
LEGEND:
BRKR -- Circuit breaker
CO -- Convenient outlet
FLA -- Full Load Amps
LRA -- Locked Rotor Amps
MCA -- Minimum Circuit Amps
Protection
NEC -- National Electrical Code
PWRD CO -- Powered convenient outlet
RLA -- Rated Load Amps
UNPWR CO -- Unpowered convenient outlet
NOTES:
1. 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 or HACR breaker. Canadian units may be fuse or cir-
cuit breaker.
2. The MCA values are calculated in accordance with The
NEC. Article 440.
3. Motor RLA and LRA values are established in accordance
with Underwriters’ Laboratories (UL). Standard 1995.
4. The 575---v units are UL, Canada---listed only.
5. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to de-
termine the percentage of voltage imbalance.
Example: Supply voltage is 230-3-60
% 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
33
=227
Determine maximum deviation from average voltage.
(AB)227–224=3v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
%VoltageImbalance =100 x
4
227
=1.76%
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%, con-
tact your local electric utility company immediately.

18 50601230202
Specifications are subject to change without notice.
PRE-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.
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
!
System Check
1. Check all indoor section and other equipment auxiliary
components. Consult the manufacturer’s instructions re-
garding any other equipment connected to the
condensing unit. If the unit has field-installed accessor-
ies, 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 dehyd-
rated.
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 “Preliminary
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 com-
pressor).
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 energize
the crankcase heater, proceed as follows:
1. Set the space thermostat set point above the space tem-
perature 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
operating charge listed in the Physical Data table (Tables 1A
and 1B). 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.
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.
CAUTION
!
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
preliminary charge step was completed, it is unnecessary to
wait the 24-hour period.
Preliminary Checks —
1. Check that electric power supply agrees with unit name-
plate 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 de-
hydrate 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 bar-
riers and covers must be in place.
NOTE:The units are factory charged with the required
amount of oil. If recharging in required, use Emkarate
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
direction. CHS units are equipped with a Comfort Alert
Diagnostic Module (CADM). Alert Code 7 indicates reverse
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 pres-
sures.
To verify the compressor is rotating in the proper direction:
1. Connect service gages 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.

19
506 01 2302 02 Specifications are subject to change without notice.
Compressor Overload —
This overload interrupts power to the compressor when
either the current or internal motor winding temperature
becomes excessive, and automatically resets when the
internal temperature drops to a safe level. This overload may
require up to 60 minutes (or longer) to reset. If the internal
overload is suspected of being open, disconnect the
electrical power to the unit and check the circuit through the
overload with an ohmmeter or continuity tester.
Advanced Scroll Temperature Protection (ASTP) —
A label located above the terminal box identifies Copeland
Scroll compressor models that contain this technology. See
Fig. 12. Advanced Scroll Temperature Protection (ASTP) is a
form of internal discharge temperature protection, that
unloads the scroll compressor when the internal temperature
reaches approximately 300F. At this temperature, 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. 13.
FIGURE 12 -- Advanced Scroll Temperature Protection Label
0
10
20
30
40
50
60
70
80
90
100
110
120
0 10 20 30 40 50 60 70 80 90
Compressor Unloaded Run Time (Minutes)
Recommended Cooling Time
(Minutes)
*Times are approximate.
NOTE: Various factors, including high humidity, high ambient
temperature, and the presence of a sound blanket will
increase cool-down times.
FIGURE 13 -- Recommended 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 Protection
will reset automatically before the motor protector resets,
which may take up to 2 hours.
Start Unit —
Set the space thermostat to a set point above space
temperature so that there is no demand for cooling. Close
the CHS disconnect switch. Only the crankcase heater will
be energized.
Reset the space thermostat below ambient so that a call for
cooling is ensured.
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 re running; bypass any
Motormaster function.
CAUTION
!
Adjust Refrigerant Charge —
The unit must be charged in Cooling mode only. Refer to
Cooling Charging Charts, Figs. 14 and 15. For applications
with line lengths greater than 100 ft, contact a
representative. Vary refrigerant until the conditions of the
chart are met. The charts are based on charging the units to
the correct subcooling for the various operating conditions.
Accurate pressure gage and temperature sensing device are
required. Connect the pressure gage 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 insulate 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 minutes. 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.

20 50601230202
Specifications are subject to change without notice.
FIGURE 14 -- CHS180 Charging Chart
15 TON CHARGING CHART R---410A ALL CONDENSER FANS OPERATING
15TONNE TABLEAU DE CHARGE R---410A
TOUTES LES SOUFFLERIES DE DONDENSATION EN FONCTIONNEMENT
CIRCUIT A
15 TON CHARGING CHART R---410A ALL CONDENSER FANS OPERATING
15TONNE TABLEAU DE CHARGE R---410A
TOUTES LES SOUFFLERIES DE DONDENSATION EN FONCTIONNEMENT
CIRCUIT B