International comfort products R-410A User manual

421 01 9701 00 May 2009
INSTALLATION INSTRUCTIONS
R−410A Ducted Horizontal Air Conditioner
Product Family: HC4A3
Fig. 1 - HC4A3
NOTE: Read the entire instruction manual before starting
the installation.
TABLE OF CONTENTS PAGE
SAFETY CONSIDERATIONS 1. . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION 2 − 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 1 − Complete Pre−Installation Checks 2. . . . . . . .
Step 2 − Rig and Mount Unit 2. . . . . . . . . . . . . . . . . . . . .
Step 3 − Complete Refrigerant Piping Connections 5. .
Step 4 − Make Electrical Connections 8. . . . . . . . . . . . .
START−UP 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock, or other conditions which may cause death, 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, protective
clothing, and work gloves. Use quenching cloth for brazing
operations. Have fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local
building codes and National Electrical Code (NEC) for
special requirements.
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 these signal words; DANGER,
WARNING, and CAUTION. These words are used with the
safety−alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe
practices which would 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.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in
personal injury or death.
Before installing, modifying, or servicing system,
main electrical disconnect switch must be in the
OFF position. There may be more than 1
disconnect switch. Lock out and tag switch with a
suitable warning label.

2421 01 9701 00
INSTALLATION
!WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal
injury 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.
PERSONAL INJURY AND EQUIPMENT DAMAGE
HAZARD
Failure to follow this caution may result in personal
injury and / or equipment damage.
DO NOT operate the unit without a filter or with grille
removed.
CAUTION
!
Step 1 —Complete Pre−Installation Checks
Unpack Unit
Move the unit to final location. Remove unit from carton,
being careful not to damage service valves and grilles.
Inspect Shipment
File a claim with the shipping company if shipment is
damaged or incomplete. Check the unit nameplates to
ensure units match job requirements.
Consider System Requirements
Consult local building codes and NEC for special installation
requirements.
Allow sufficient space for airflow clearance, wiring,
refrigerant piping, and servicing unit. See Fig. 2.
Locate unit so that condenser airflow is unrestricted on both
sides. Refer to Fig. 2.
Unit may be mounted on a level pad directly on base legs or
mounted on raised pads at support points. See Fig. 2 for
center of gravity.
Matching the Condensing Unit to an Indoor Unit
The HC4A318−60 ducted condensing units can be matched
to corresponding indoor units. The HC4A3 unit can be
matched with under−ceiling and residential fan coils and
evaporator coils. Refer to separate indoor unit literature for
more information.
Step 2 —RIG AND MOUNT UNIT
Mounting on Ground
Mount unit on a solid, level concrete pad. Position unit so
water or ice from roof does not fall directly onto unit.
Accessory stacking kits can be used when units are to be
stacked. See installation instructions provided with the
accessory kit. Use field−provided snow stand or ice rack
where prolonged subfreezing temperatures or heavy snow
occurs.
If conditions or local codes require unit be fastened to a pad,
6 field−supplied tiedown bolts should be used and fastened
through slots provided in unit mounting feet.
Mounting on Roof
Mount unit on a level platform or frame at least 6 in. (152.4
mm) above roof surface. Isolate unit and tubing from
structure.

421 01 9701 00 3
4 3/16
11/16
H
G
L
A
B
J
K
N
P
E
FDC
7 1/22 1/2
1
8
4 1/2
1 7/16
UNIT SERIES ELECTRICAL
CHARACTERISTICS ABC DE FG H J K L MNP OPERATING
WEIGHT(lbs)
SHIPPING
WEIGHT(lbs)
SHIPPING
DIMENSIONS (L x W x H)
HC4A318**A 1 XOOO25
1/836 15/1614 9/161623 7/1617 3/1617 1/822136 5/811 1/45/82 15/166155 171 42 9/10X 18X 28 1/10
HC4A324**A 1,2 XOOO311/836 15/1614 9/161623 7/1617 3/1623 1/828146 3/411 5/85/82 15/166180 198 42 9/10X 18X 34 1/10

HC4A330**A 1 XOOO37
3/1644 9/1617 1/1618 7/1630 1/219 5/829 3/1634 1/1613 11/168 1/815 7/83/43 7/166 1/2200 223 50 1/2X 20 1/2X 40 2/
1
HC4A336**A 1 XOXX373/1644 9/1617 1/1618 7/1630 1/219 5/829 3/1634 1/1613 11/168 1/815 7/83/43 7/166 1/2218 240 50 1/2X 20 1/2X 40 2/
1
HC4A348**A 1,2 XOXX43
3/1644 9/1617 1/1618 7/1630 1/219 5/835 3/1640 1/1614 1/28 1/218 7/87/83 7/166 1/2284 309 50 1/2X 20 1/2X 46 2/
HC4A360**A 1,2 XOXX433/1644 9/1617 1/1618 7/1630 1/219 5/835 3/1640 1/1614 1/28 1/218 7/87/83 7/166 1/2294 319 50 1/2X 20 1/2X 46 2/
UNIT SIZE
MINIMUM
MOUNTING PAD
DIMENSIONS
18,24 23X 42
30,36,48,60 24X 50
208−230−1−60
230−1−60
208/230−3−60
460−3−60
1 1/2
FIELD CONTROL SUPPLY WIRE ENTRY 7/8HOLE W/GROMMET
1. REQUIRED CLEARANCES: WITH COIL FACING WALL; ALLOW 6MIN CLEARANCE ON COIL SIDE AND COIL END AND 36MIN CLEARANCE ON COMPRESSOR END AND FAN SIDE. WITH FAN FACING WALL; ALLOW 8MIN CLEARANCE ON FAN SIDE AND COIL END AND 36MIN CLEARANCE ON COMPRESSOR END AND COIL SIDE. WITH MULTI UNIT APPLICATION; ARRANGE UNITS SO DISCHARGE OF ONE DOES NOT ENTER INLET OF ANOTHER. 2. MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS 55 $F, MAX. 125 $F. 3. SERIES DESIGNATION IS THE 10TH POSITION OF THE UNIT MODEL NUMBER. 4. CENTER OF GRAVITY 5. ALL DIMENSIONS ARE IN INCHESUNLESS NOTED.
FIELD POWER SUPPLY CONN. HOLE SIZES PROVIDED: 7/8−1/2TRADE 1 3/16−3/4TRADE 1 3/8−1TRADE
MEASUREMENT− ENGLISH
3/8LIQUID LINE
FEMALE SWEAT CONN.
X = YES O = NO
FEMALE SWEAT CONN.
VAPOR LINE CONN.
M
JUNCTION BOX FOR POWER SUPLLY AND CONTROL CONNECTIONS
AIR
AIR
Fig. 2 - HC4A3 Unit Dimensions

4421 01 9701 00
106.4
17.5
H
G
L
A
B
J
K
N
P
E
FDC
190.5 63.5
25.4
203.2
38.1
114.3
36.5
N
UNIT SERIES ELECTRICAL
CHARACTERISTICS ABCD EFGH JKLM NP
OPERATING
WEIGHT(KG)
SHIPPING
WEIGHT(KG)
SHIPPING
DIMENSIONS (L x W x H)
HC4A318**A 1 XOOO 638.2 938.2 369.9 406.4 595.3 436.6 435.0 558.8 330.2 168.3 285.8 15.9 74.6 152.4 70.4 77.7 1090.2 X 457.7 X 714.
3
HC4A324**A 1,2 XOOO 790.6 938.2 369.9 406.4 595.3 436.6 587.4 711.2 355.6 171.5 295.3 15.9 74.6 152.4 81.8 90.0 1090.2 X 457.7 X 866. HC4A330**A 1 XOOO 944.6 1131.9 433.4 468.3 774.7 498.5 741.4 865.2 347.7 206.4 403.2 19.0 87.3 165.1 90.9 101.4 1282.7 X 520.7 X 1020. HC4A336**A 1 XOXX 944.6 1131.9 433.4 468.3 774.7 498.5 741.4 865.2 347.7 206.4 403.2 19.0 87.3 165.1 99.0 109.0 1282.7 X 520.7 X 1020. HC4A348**A 1,2 XOXX 1097.0 1131.9 433.4 468.3 774.7 498.5 893.8 1017.6 368.3 215.9 479.4 22.2 87.3 165.1 129.0 140.4 1282.7 X 520.7 X 1173.1 HC4A360**A 1,2 XOXX 1097.0 1131.9 433.4 468.3 774.7 498.5 893.8 1017.6 368.3 215.9 479.4 22.2 87.3 165.1 133.6 145.0 1282.7 X 520.7 X 1173.1
UNIT SIZE
MINIMUM
MOUNTING PAD
DIMENSIONS
18,24 584.2 X 1066.8
30,36,48,60 609.6 X 1270.0
208−230−1−60
230−1−60
208/230−3−60
460−3−60
FIELD CONTROL SUPPLY WIRE ENTRY 22.22 HOLE W/GROMMET
FIELD POWER SUPPLY CONN. HOLE SIZES PROVIDED: 22.22 − 12.70 TRADE 30.16 − 19.05 TRADE 34.92 − 25.40 TRADE
MEASUREMENT− METRIC SI
9.53 LIQUID LINE
FEMALE SWEAT CONN.
X = YES O = NO
1. REQUIRED CLEARANCES: WITH COIL FACING WALL; ALLOW 152.4 MIN CLEARANCE ON COIL SIDE AND COIL END AND 914.4 MIN CLEARANCE ON COMPRESSOR END AND FAN SIDE. WITH FAN FACING WALL; ALLOW 203.2 MIN CLEARANCE ON FAN SIDE AND COIL END AND 914.4 MIN CLEARANCE ON COMPRESSOR END AND COIL SIDE. WITH MULTI UNIT APPLICATION; ARRANGE UNITS SO DISCHARGE OF ONE DOES NOT ENTER INLET OF ANOTHER. 2. MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS 12.8 $C, MAX. 51.7 $C. 3. SERIES DESIGNATION IS THE 10TH POSITION OF THE UNIT MODEL NUMBER. 4. CENTER OF GRAVITY 5. ALL DIMENSIONS ARE IN MMUNLESS NOTED.
FEMALE SWEAT CONN.
VAPOR LINE CONN.
M
JUNCTION BOX FOR POWER SUPLLY AND CONTROL CONNECTIONS
AIR
AIR
Fig. 3 - HC4A3 Unit Dimensions

421 01 9701 00 5
Rigging
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this caution may result in personal
injury and/or equipment damage.
Be sure unit panels are securely in place prior to
rigging.
CAUTION
!
Keep the unit upright and lift unit using a sling. Use
cardboard or padding under the sling, and spreader bars to
prevent sling damage to the unit. See Fig. 4. See Fig. 2 for
center of gravity reference. Install the unit so that the coil
does not face into prevailing winds. If this is not possible
and constant winds above 25 mph are expected, use
accessory wind baffle. See installation instructions provided
with the accessory kit.
NOTE: Accessory wind baffles should be used on all units
with accessory low ambient temperature control.
Field−fabricated snow or ice stands may be used to raise
unit when operation will be required during winter months.
Units may also be wall mounted using the accessory wall
mounting kit.
A07396
Fig. 4 - Lifting Unit with Sling
Step 3 —COMPLETE REFRIGERANT PIPING
CONNECTIONS
Outdoor units may be connected to indoor units using
field−supplied tubing of refrigerant grade and condition. See
Table 1 for correct line sizes. Do not use less than 10 ft
(3.05 m) of interconnecting tubing.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
If any section of pipe is buried, there must be a 6 in.
(152.4 mm) vertical rise to the valve connections on
the outdoor unit. If more than the recommended
length is buried, refrigerant may migrate to cooler,
buried section during extended periods of system
shutdown. This causes refrigerant slugging and
could possibly damage the compressor at start−up.
When more than 80 ft (24.38 m) of interconnecting tubing
and more than 20 ft (6.10 m) of vertical lift is used, consult
the residential Long Line Application Guide for required
accessories. If either refrigerant tubing or indoor coil is
exposed to the atmosphere, the system must be evacuated
following good refrigeration practices.
Run refrigerant tubes as directly as possible, avoiding
unnecessary turns and bends. Suspend refrigerant tubes so
they do not damage insulation on vapor tube and do not
transmit vibration to structure. Also, when passing
refrigerant tubes through a wall, seal the opening so that
vibration is not transmitted to structure. Leave some slack in
refrigerant tubes between structure and outdoor unit to
absorb vibration. Refer to separate indoor unit installation
instructions for additional information.
Expansion Device
A hard shutoff, thermostatic expansion valve (TXV) is
required at the indoor section of the system for proper
operation of these products. If the indoor section of the
system is not equipped with a hard shutoff TXV, refer to
Spec Sheet for the correct TXV kit to be installed. Follow
the instructions in the kit for proper installation.

6421 01 9701 00
Filter Drier
The filter drier must be replaced whenever the refrigeration
system is exposed to the atmosphere.
Refer to Fig. 5 and install filter drier as follows:
1. Braze 5−in. (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5−in. (127 mm) liquid tube.
Flow arrow must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter
drier.
A05178
Fig. 5 - Filter Drier Components
Only use factory specified liquid−line filter driers with rated
working pressures less than 600 psig.
NOTE: Do not install a suction−line filter drier in liquid line.
Make Piping Sweat Connections
Remove plastic caps from liquid and suction service valves.
Use refrigerant grade tubing. Service valves are closed from
the factory and are ready for brazing. After wrapping the
service valve with a wet cloth, the tubing set can be brazed
to the service valve using either silver bearing or non−silver
bearing brazing material. Consult local code requirements.
Refrigerant tubing and the indoor coil are now ready for leak
testing.
NOTE: Unit is shipped with R−410A refrigerant factory
charge indicated on nameplate.
Pass nitrogen or other inert gas through piping while brazing
to prevent formation of copper oxide.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to unit or service valves observe
the following:
Use a brazing shield.
Wrap service valves with wet cloth or use a heat
sink material.
Provide Safety Relief
A fusible plug is located in unit suction line; do not cap this
plug. If local code requires additional safety devices, install
as directed.

421 01 9701 00 7
Table 1—HC4A318−60 Physical Data
UNIT HC4A3 18 24A*A1 30 36 48A*A1 60
NOMINAL CAPACITY Tons (kg) 1.5 (1360.8) 2.0 (1814.4) 2.50 (2268.0) 3.0 (2721.6) 4.0 (3628.8) 5.0 (4536.0)
OPERATING WEIGHT lb (kg) 155 (70) 180 (82) 200 (91) 218 (99) 284 (129) 294 (134)
REFRIGERANT TYPE R-410A
METERING DEVICE TXV
CHARGE* lb (kg)
6.3 (2.86) 6.5 (2.95) 8.7 (3.95) 8.7 (3.95) 12.0 (5.45) 12.0 (5.45)
24A*A2 48A*A2
6.0 (2.73) 11.5 (5.23)
Note: A*A1 and A*A2 Indicates AKA, AHA, or ALA
COMPRESSOR
Type Scroll
Oil Charge (POE -oz) 25.0 25.0 25.0 25.0 42.0 42.0
Crankcase Heater (watts) — — 40 40 40 40
OUTDOOR FAN
Rpm/Cfm 840/1720 840/1720 850/3900 850/3900 850/3900 850/3900
Diameter (in.) 18 18 24 24 24 24
No. Blades 3 3 3 3 3 3
Motor (hp) 1/8 1/8 1/4 1/4 1/4 1/4
OUTDOOR COIL
Face Area (sq ft) 5.8 7.3 12.1 12.1 14.1 14.1
No. Rows 2 2 2 2 2 2
FPI 20 20 20 20 20 20
HIGH PRESSURE SWITCH
Cut-In (psig)
Cutout (psig)
420 ±25
650 ±10
420 ±25
650 ±10
420 ±25
650 ±10
420 ±25
650 ±10
420 ±25
650 ±10
420 ±25
650 ±10
REFRIGERANT LINES
Connection Type Sweat
Liquid Line (in.) OD 3/8 3/8 3/8 3/8 3/8 3/8
Vapor Line (in.) OD 5/8 5/8 3/4 3/4 7/8 7/8†
Max Length (ft) 200 200 200 200 200 200
Max Lift (ft)** 65 65 65 65 65 65
Max Drop (ft) 150 150 150 150 150 150
CONTROLS
Control Voltage24 vac
System Voltage 208/230 v 208/230 v 208/230 v 208/230 v, Single and 3 Phase, 460 v, 3 Phase
FINISH Gray
* Unit shipped with full factory charge. See ARI (Air Conditioning and Refrigeration Institute) capacity table for proper charge and piston for each fan coil type.
 Valve connection size is 7/8 inch. Recommended line size is 1-1/8 inches.
24 v and a minimum of 40 va is provided in the fan coil unit.
FPI - Fins Per Inch
POE - Polyol Ester

8421 01 9701 00
Step 4 —Make Electrical connections
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
The unit cabinet must have an uninterrupted or
unbroken ground to minimize personal injury if an
electrical fault should occur. The ground may consist
of electrical wire or metal conduit when installed in
accordance with existing electrical codes.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Unit failure as a result of operation on improper line
voltage or excessive phase imbalance constitutes
abuse and may cause damage to electrical
components. Such operation would void any
applicable warranty.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing service or maintenance, be sure
indoor unit main power switch is turned OFF and
indoor blower has stopped.
Control Circuit Wiring
Control voltage is 24 v (40 va minimum). See Fig. 6 and unit
label diagram for field−supplied wiring details. Route control
wire through opening in unit side panel to connection in unit
control box.
A07398
Fig. 6 - HC4A3 Typical Control Circuit Connections
NOTE: Use No. 18 AWG color−−coded, insulated (35C
minimum) wire. If thermostat is located more than 100 ft
(30.48 m). from unit, as measured along the control voltage
wires, use No. 16 AWG color−coded wire to avoid excessive
voltage drop.
NOTE: All wiring must conform to NEC and local codes.
NOTE: Operating unit on improper line voltage constitutes
abuse and could affect warranty. See Table 2. Do not install
unit in a system where voltage may fluctuate above or
below permissible limits.
See Table 2 for recommended fuse sizes. When making
electrical connections, provide clearance at the unit for
refrigerant piping connections.
NOTE: The HC4A3 units use the control transformer
supplied with the matched indoor unit.
Power Wiring
Unit is factory wired for voltage shown on nameplate.
Provide adequate, fused disconnect switch within sight from
unit, readily accessible, but out of reach of children.
Provision for locking the switch open (off) is advisable to
prevent power from being turned on while unit is being
serviced.
Disconnect switch, fuses, and field wiring must comply with
the NEC and local code requirements. Use copper wire only
between the disconnect switch and unit. Use minimum 75C
wire for the field power connection.
Route power wires through the opening in unit side panel
and connect in the unit control box as shown on the unit
label diagram and Fig. 7. Unit must be grounded.
Connections to Duct Free Fan Coil Units
The HC4A3 units are designed for easy match−up to
underceiling duct free fan coils. This unit provides 24 v power
for the outdoor unit from the fan coil. Connect the Y and C
terminals of the indoor unit to the Y and C terminals.

421 01 9701 00 9
Table 2—HC4A3 Electrical Data
HC4A3
UNIT
SIZE
V-PH-Hz
VOLTAGE
RANGE*
COMPRESSOR OUTDOOR FAN MOTOR MIN
CKT
AMPS
FUSE/CKT BKR
AMPS
RLA LRA FLA NEC
Hp
kw
Out
Min Max
18AKA1 208/230-1-60 187 253 9.0 48.0 0.80 0.125 0.09 12.1 20
24AKA1 208/230-1-60 187 253 12.8 58.3 0.80 0.125 0.09 16.8 25
24AKA2 208/230-1-60 187 253 13.5 58.3 0.80 0.125 0.09 17.7 25
30AKA1 208/230-1-60 187 253 14.1 73.0 1.5 0.25 0.19 19.1 30
36AKA1 208/230-1-60 187 253 14.1 77.0 1.5 0.25 0.19 19.1 30
36AHA1 208/230-3-60 187 253 9.0 71.0 1.5 0.25 0.19 12.7 20
36ALA1 460-3-60 414 506 5.6 38.0 0.80 0.25 0.19 7.8 15
48AKA1 208/230-1-60 187 253 21.8 117.0 1.5 0.25 0.19 28.7 50
48AHA1 208/230-3-60 187 253 13.7 83.1 1.5 0.25 0.19 18.6 30
48ALA1 460-3-60 414 506 6.2 41.0 0.80 0.25 0.19 8.6 15
48AKA2 208/230-1-60 187 253 19.9 109.0 1.5 0.25 0.19 26.4 40
48AHA2 208/230-3-60 187 253 13.1 83.1 1.5 0.25 0.19 17.9 25
48ALA2 460-3-60 414 506 6.1 41.0 0.80 0.25 0.19 8.4 15
60AKA1 208/230-1-60 187 253 26.4 134.0 1.5 0.25 0.19 34.5 60
60AHA1 208/230-3-60 187 253 16.0 110.0 1.5 0.25 0.19 21.5 35
60ALA1 460-3-60 414 506 7.8 52.0 0.80 0.25 0.19 10.6 15
60AKA2 208/230-1-60 187 253 26.4 134.0 1.5 0.25 0.19 34.5 60
60AHA2 208/230-3-60 187 253 15.0 110.0 1.5 0.25 0.19 21.5 30
60ALA2 460-3-60 414 506 7.8 52.0 0.80 0.25 0.19 10.6 15
LEGEND:
FLA - Full Load Amps
LRA - Locked Rotor Amps
NEC - National Electrical Code
RLA - Rated Load Amps (compressor)
* Permissible limits of the voltage range at which the unit will operate
satisfactorily
NOTES:
1. Control circuit is 24-V on all units and requires external power
source. Copper wire must be used from service disconnect to unit.
2. All motors/compressors contain internal overload protection.
3. In compliance with NEC (U.S.A. Standard) 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 breaker.
4. Motor RLA values are established in accordance with UL
(Underwriters' Laboratories) Standard 465 (U.S.A. Standard).
5. HC4A318-30 units are only available in single-phase voltage.
6. 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 determine the
percentage of voltage imbalance:
= 100 X max voltage deviation from average voltage
average
EXAMPLE: Supply voltage is 460-3-60
AB = 452v
BC = 464v
AC = 455v
Average Voltage = 452 + 464 + 455
3
= 1371
3
=457
Determine maximum deviation from average voltage:
(AB) 457-452 = 5v
(BC) 464-457 = 7v
(AC) 457-455 = 2v
Maximum deviation is 7v.
Determine percentage of voltage imbalance
% of voltage imbalance = 100 x 7
57
=1.53%
This amount of phase imbalance is satisfactory as it is below the maximum
allowable of 2%.
IMPORTANT: Contact your local electric utility company immediately if the
supply voltage phase imbalance is more than 2%.

10 421 01 9701 00
HC4A3 OPERATION SEQUENCE
CALL FOR COOLING: 1. Control voltage from transformer to thermostat (24 v). 2. At thermostat 24 v is switched to “G” and “Y.” 3. 24 v from thermostat “G” energizes fan relay at indoor fan coil and indoor-fan motor runs. 4. 24 v from thermostat “Y” energizes the contactor coil at the outdoor unit.
Compressor and outdoor-fan motor run.
6. If the internal protector of the compressor, HPS, or LPS open, the 24 v to the contactor coil will be inter-
rupted, and compressor and outdoor fan motor will stop.
A07535
Fig. 7 - HC4A318−60 Typical Wiring Schematic

421 01 9701 00 11
START−UP
Step 1 —Preliminary Checks
1. Check that all internal wiring connections are tight
and that all barriers, covers, and panels are in place.
2. Field electrical power source must agree with unit
nameplate rating.
3. All service valves must be open.
4. Belly−band crankcase heater must be tight on
compressor crankcase for those units with belly−band
heaters.
Step 2 —Leak Test
Field piping and fan coil must be leak tested by pressure
method. Use R−410A refrigerant at approximately 25 psig
backed up with an inert gas to a total pressure not to
exceed 245 psig.
Step 3 —Evacuate and Dehydrate
Field piping and fan coil must be evacuated and
dehydrated.
Step 4 —Charge System
Release charge into system by opening (backseating) liquid
and suction line service valves.
Step 5 —To Start Unit
Be sure that the field disconnect is closed. Set room
thermostat below ambient temperature. Operate unit for 15
minutes, then check system refrigerant charge. See
Refrigerant Charging section on page 12.
NOTE: When using in conjunction with underceiling fan
coils, refer to start−up instructions included with fan coil for
correct start−up procedures.
SERVICE
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in
personal injury or death.
Before installing, modifying, or servicing system,
main electrical disconnect switch must be in the
OFF position. There may be more than 1
disconnect switch. Lock out and tag switch with a
suitable warning label.
Outdoor Fan
A reinforced wire mount holds the outdoor fan assembly in
position. See Fig. 8 for proper mounting position.
HC4A3 Unit Size, in. (mm)
18,24 30,36 48,60
0.433 (11.00) 0 0 A07401
Fig. 8 - Condenser Fan Mounting Positions
High−Pressure Relief Valve
The high−pressure relief valve is located in the compressor.
The relief valve opens at a pressure differential of
approximately 550 to 625 ±50 psig between suction (low
side) and discharge (high side) to allow pressure
equalization.
Internal Current and Temperature Sensitive Overload
The control resets automatically when internal compressor
motor temperature drops to a safe level (overloads may
require up to 45 minutes to reset). When an internal
overload is suspected of being open, check by using an
ohmmeter or continuity tester.
Pumpdown Procedure
The system may be pumped down in order to make repairs
on the low side without losing complete refrigerant charge.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never open system to atmosphere while it is under a
vacuum.
When system must be opened for service, recover
refrigerant, break vacuum with dry nitrogen before opening
system.
1. Attach pressure gage to suction service valve gage port.
2. Frontseat the liquid/mixed phase line valve.
3. Start unit and run until suction pressure reaches 20 psig.
4. Shut unit off and frontseat suction valve.
5. De−pressurize low side of unit and recover refrigerant
following accepted practices.

12 421 01 9701 00
Crankcase Heater
The crankcase heater prevents refrigerant migration and
compressor oil dilution during shutdown when compressor
is not operating. If the crankcase heater is de−energized for
more than 6 hours, both compressor service valves must be
closed.
NOTE: Crankcase heaters are only available on
HC4A3030−060 units.
The crankcase heater is powered by the high−voltage
power of the unit. It is connected across the line side of the
contactor and is thermostatically controlled.
!WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in
personal injury or death.
Use extreme caution when troubleshooting this
device as line voltage is continually present.
To troubleshoot:
1. Apply voltmeter across crankcase heater leads to see
if heater voltage is on. Do not touch heater. Carefully
feel area around crankcase heater; if warm,
crankcase heater is functioning.
2. With power off and heater leads disconnected, check
across leads with ohmmeter. Do not look for a specific
resistance reading. Check for resistance or an open
circuit, and change heater if an open circuit is
detected.
Service Valves
The service valves in the outdoor unit come from the factory
frontseated. This means the refrigerant charge is isolated
from the line−set connection ports. To prevent damage to
the valve, use a wet cloth or other accepted heat sink
material on the valve before brazing.
The service valve cannot be field repaired, therefore, only a
complete valve or valve stem seal and service port caps are
available for replacement.
Refrigerant Charging
!WARNING
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this warning could result in
personal injury and/or equipment damage.
Wear safety glasses and gloves when handling
refrigerant. Do not overcharge system − this can
cause compressor flooding.
!WARNING
PERSONAL INJURY AND/OR EQUIPMENT
DAMAGE HAZARD
Failure to follow this warning could result in
personal injury and/or equipment damage.
Service valves must be fully backseated to close
service port. There is no Schrader valve at the
service port, and failure to backseat the valve
could result in loss of system charge or personal
injury.
NOTE: Do not vent or de−pressurize unit refrigerant to
atmosphere. Remove and recover refrigerant following
accepted practices.
All units are shipped with the refrigerant charge listed on the
nameplate.
Refer to Table 3 and consider the following when working
with R−410A refrigerant:
R−410A refrigerant cylinders are rose colored.
Recovery cylinder service pressure rating must be
400 psig, DOT (Department of Transportation)
4BA400 or DOT BW400.
R−410A systems should be charged with liquid
refrigerant. Use a commercial type metering device
in the manifold hose when charging into suction line
with compressor operating.
Manifold sets should be 700 psig high side and 180
psig low side with 550 psig low−side retard.
Use hoses with 700 psig service pressure rating.
R−410A refrigerant, as with other HFCs, is only
compatible with POE oils.
Vacuum pumps will not remove moisture from oil.
Polyol Ester oils absorb moisture rapidly. Do not
expose oil to atmosphere.
Polyol Ester oils may cause damage to certain
plastics and roofing materials.
Wrap all filter driers and service valves with wet cloth
when brazing.
Factory approved, liquid−line filter drier is required
on every unit.
Do not use a TXV (thermostatic expansion valve)
designed for use with R−22 refrigerant. Refer to
separate indoor unit installation instructions for more
details.
If using a suction line drier, do not leave in place for
more than 72 hours.

13
Table 3—Pressure vs. Temperature Chart − R−410A Refrigerant
PRESSURE TEMPERATURE PRESSURE TEMPERATURE PRESSURE TEMPERATURE PRESSURE TEMPERATURE PRESSURE TEMPERATURE PRESSURE TEMPERATURE
PSIG °F °C PSIG °F °C PSIG °F °C PSIG °F °C PSIG °F °C PSIG °F °C
12 –37.7 -38.72 114 37.8 3.22 216 74.3 23.50 318 100.2 37.89 420 120.7 49.28 522 137.6 58.67
14 –34.7 -37.06 116 38.7 3.72 218 74.9 23.83 320 100.7 38.17 422 121.0 49.44 524 137.9 58.83
16 –32.0 -35.56 118 39.5 4.17 220 75.5 24.17 322 101.1 38.39 424 121.4 49.67 526 138.3 59.06
18 –29.4 -34.11 120 40.5 4.72 222 76.1 24.50 324 101.6 38.67 426 121.7 49.83 528 138.6 59.22
20 –26.9 -32.72 122 41.3 5.17 224 76.7 24.83 326 102.0 38.89 428 122.1 50.06 530 138.9 59.39
22 –24.5 -31.90 124 42.2 5.67 226 77.2 25.11 328 102.4 39.11 430 122.5 50.28 532 139.2 59.56
24 –22.2 -30.11 126 43.0 6.11 228 77.8 25.44 330 102.9 39.39 432 122.8 50.44 534 139.5 59.72
26 –20.0 -28.89 128 43.8 6.56 230 78.4 25.78 332 103.3 39.61 434 123.2 50.67 536 139.8 59.89
28 –17.9 -27.72 130 44.7 7.06 232 78.9 26.06 334 103.7 39.83 436 123.5 50.83 538 140.1 60.06
30 –15.8 -26.61 132 45.5 7.50 234 79.5 26.39 336 104.2 40.11 438 123.9 51.06 540 140.4 60.22
32 –13.8 -25.44 134 46.3 7.94 236 80.0 26.67 338 104.6 40.33 440 124.2 51.22 544 141.0 60.56
34 –11.9 -24.39 136 47.1 8.39 238 80.6 27.00 340 105.1 40.61 442 124.6 51.44 548 141.6 60.89
36 –10.1 -23.39 138 47.9 8.83 240 81.1 27.28 342 105.4 40.78 444 124.9 51.61 552 142.1 61.17
38 –8.3 -22.39 140 48.7 9.28 242 81.6 27.56 344 105.8 41.00 446 125.3 51.83 556 142.7 61.50
40 –6.5 -21.39 142 49.5 9.72 244 82.2 27.89 346 106.3 41.28 448 125.6 52.00 560 143.3 61.83
42 –4.5 -20.28 144 50.3 10.17 246 82.7 28.17 348 106.6 41.44 450 126.0 52.22 564 143.9 62.17
44 –3.2 -19.56 146 51.1 10.61 248 83.3 28.50 350 107.1 41.72 452 126.3 52.39 568 144.5 62.50
46 –1.6 -18.67 148 51.8 11.00 250 83.8 28.78 352 107.5 41.94 454 126.6 52.56 572 145.0 62.78
48 0.0 -17.78 150 52.5 11.39 252 84.3 29.06 354 107.9 42.17 456 127.0 52.78 576 145.6 63.11
50 1.5 -16.94 152 53.3 11.83 254 84.8 29.33 356 108.3 42.39 458 127.3 52.94 580 146.2 63.44
52 3.0 -16.11 154 54.0 12.22 256 85.4 29.67 358 108.8 42.67 460 127.7 53.17 584 146.7 63.72
54 4.5 -15.28 156 54.8 12.67 258 85.9 29.94 360 109.2 42.89 462 128.0 53.33 588 147.3 64.06
56 5.9 -14.50 158 55.5 13.06 260 86.4 30.22 362 109.6 43.11 464 128.3 53.50 592 147.9 64.39
58 7.3 -13.72 160 56.2 13.44 262 86.9 30.50 364 110.0 43.33 466 128.7 53.72 596 148.4 64.67
60 8.6 -13.00 162 57.0 13.89 264 87.4 30.78 366 110.4 43.56 468 129.0 53.89 600 149.0 65.00
62 10.0 -12.22 164 57.7 14.28 266 87.9 31.06 368 110.8 43.78 470 129.3 54.06 604 149.5 65.28
64 11.3 -11.50 166 58.4 14.67 268 88.4 31.33 370 111.2 44.00 472 129.7 54.28 608 150.1 65.61
66 12.6 -10.78 168 59.0 15.00 270 88.9 31.61 372 111.6 44.22 474 130.0 54.44 612 150.6 65.89
68 13.8 -10.11 170 59.8 15.44 272 89.4 31.89 374 112.0 44.44 476 130.3 54.61 616 151.2 66.22
70 15.1 -9.39 172 60.5 15.83 274 89.9 32.17 376 112.4 44.67 478 130.7 54.83 620 151.7 66.50
72 16.3 -8.72 174 61.1 16.17 276 90.4 32.44 378 112.6 44.78 480 131.0 55.00 624 152.3 66.83
74 17.5 -8.06 176 61.8 16.56 278 90.9 32.72 380 113.1 45.06 482 131.3 55.17 628 152.8 67.11
76 18.7 -7.39 178 62.5 16.94 280 91.4 33.00 382 113.5 45.28 484 131.6 55.33 632 153.4 67.44
78 19.8 -6.78 180 63.1 17.28 282 91.9 33.28 384 113.9 45.50 486 132.0 55.56 636 153.9 67.72
80 21.0 -6.11 182 63.8 17.67 284 92.4 33.56 386 114.3 45.72 488 132.3 55.72 640 154.5 68.06
82 22.1 -5.50 184 64.5 18.06 286 92.8 33.78 388 114.7 45.94 490 132.6 55.89 644 155.0 68.33
84 23.2 -4.89 186 65.1 18.39 288 93.3 34.06 390 115.0 46.11 492 132.9 56.06 648 155.5 68.61
86 24.3 -4.28 188 65.8 18.78 290 93.8 34.33 392 115.5 46.39 494 133.3 56.28 652 156.1 68.94
88 25.4 -3.67 190 66.4 19.11 292 94.3 34.61 394 115.8 46.56 496 133.6 56.44 656 156.6 69.22
90 26.4 -3.11 192 67.0 19.44 294 94.8 34.89 396 116.2 46.78 498 133.9 56.61 660 157.1 69.50
92 27.4 -2.56 194 67.7 19.83 296 95.2 35.11 398 116.6 47.00 500 134.0 56.67 664 157.7 69.83
94 28.5 -1.94 196 68.3 20.17 298 95.7 35.39 400 117.0 47.22 502 134.5 56.94 668 158.2 70.11
96 29.5 -1.39 198 68.9 20.50 300 96.2 35.67 402 117.3 47.39 504 134.8 57.11 672 158.7 70.39
98 30.5 -0.83 200 69.5 20.83 302 96.6 35.89 404 117.7 47.61 506 135.2 57.33 676 159.2 70.67
100 31.2 -0.44 202 70.1 21.17 304 97.1 36.17 406 118.1 47.83 508 135.5 57.50 680 159.8 71.00
102 32.2 0.11 204 70.7 21.50 306 97.5 36.39 408 118.5 48.06 510 135.8 57.67 684 160.3 71.28
104 33.2 0.67 206 71.4 21.89 308 98.0 36.67 410 118.8 48.22 512 136.1 57.83 688 160.8 71.56
106 34.1 1.17 208 72.0 22.22 310 98.4 36.89 412 119.2 48.44 514 136.4 58.00 692 161.3 71.83
108 35.1 1.72 210 72.6 22.56 312 98.9 37.17 414 119.6 48.67 516 136.7 58.17 696 161.8 72.11
110 35.5 1.94 212 73.2 22.89 314 99.3 37.39 416 119.9 48.83 518 137.0 58.33 - - -
112 36.9 2.72 214 73.8 23.22 316 99.7 37.61 418 120.3 49.06 520 137.3 58.50 - - -

14 421 01 9701 00
Subcooling Method
NOTE: Units are charged at the factory for 15 ft of tubing.
Adjust charge by plus or minus 0.6 oz per foot of tubing
greater or less than 15 ft respectively.
For HC4A3 units, the subcooling method is used to check
and adjust charge during the cooling season. Refer to Table
4 and the following procedure:
1. Operate unit a minimum of 15 minutes before
checking charge.
2. Measure liquid line temperature near liquid line
service valve, and measure the liquid pressure at the
liquid line service valve. Use a digital thermometer for
all temperature measurements. DO NOT use mercury
or dial−type thermometers.
3. Refer to Table 4. Find the temperature point at which
the required subcooling temperature intersects the
measured liquid line pressure.
4. If the measured liquid line temperature does not
agree with the required liquid line temperature, ADD
refrigerant to lower the temperature, or REMOVE
refrigerant to raise the temperature (allow a tolerance
of ±3F/1.67C).
Table 4—Subcooling Charging Table
LIQUID
PRES
SURE AT
SERVICE
VALVE
REQUIRED LIQUID LINE TEMPERATURE
Required Subcooling Temperature _F (5C)
8(4.4) 10 (5.5) 12 (6.6) 14 (7.7) 16 (8.8) 18 (9.9)
psig _F5C_F5C_F5C_F5C_F5C_F5C
189 58 32 56 31 54 30 52 29 50 28 48 27
195 60 33 58 32 56 31 54 30 52 29 50 28
202 62 34 60 33 58 32 56 31 54 30 52 29
208 64 36 62 34 60 33 58 32 56 31 54 30
215 66 37 64 36 62 34 60 33 58 32 56 31
222 68 38 66 37 64 36 62 34 60 33 58 32
229 70 39 68 38 66 37 64 36 62 34 60 33
236 72 40 70 39 68 38 66 37 64 36 62 34
243 74 41 72 40 70 39 68 38 66 37 64 36
251 76 42 74 41 72 40 70 39 68 38 66 37
259 78 43 76 42 74 41 72 40 70 39 68 38
266 80 44 78 43 76 42 74 41 72 40 70 39
274 82 46 80 44 78 43 76 42 74 41 72 40
283 84 47 82 46 80 44 78 43 76 42 74 41
291 86 48 84 47 82 46 80 44 78 43 76 42
299 88 49 86 48 84 47 82 46 80 44 78 43
308 90 50 88 49 86 48 84 47 82 46 80 44
317 92 51 90 50 88 49 86 48 84 47 82 46
326 94 52 92 51 90 50 88 49 86 48 84 47
335 96 53 94 52 92 51 90 50 88 49 86 48
345 98 54 96 53 94 52 92 51 90 50 88 49
354 100 56 98 54 96 53 94 52 92 51 90 50
364 102 57 100 56 98 54 96 53 94 52 92 51
374 104 58 102 57 100 56 98 54 96 53 94 52
384 106 59 104 58 102 57 100 56 98 54 96 53
395 108 60 106 59 104 58 102 57 100 56 98 54
406 110 61 108 60 106 59 104 58 102 57 100 56
416 112 62 110 61 108 60 106 59 104 58 102 57
427 114 63 112 62 110 61 108 60 106 59 104 58
439 116 64 114 63 112 62 110 61 108 60 106 59
450 118 66 116 64 114 63 112 62 110 61 108 60
462 120 67 118 66 116 64 114 63 112 62 110 61
474 122 68 120 67 118 66 116 64 114 63 112 62
486 124 69 122 68 120 67 118 66 116 64 114 63
499 126 70 124 69 122 68 120 67 118 66 116 64
511 128 71 126 70 124 69 122 68 120 67 118 66

421 01 9701 00 15
MAINTENANCE
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out
and tag switch with a suitable warning label.
LUBRICATION
Compressor
Compressor contains factory oil charge; replace oil when
lost. Use Mobile 3MA−POE oil.
CLEANING COILS
Coil should be washed out with water or blown out with
compressor air. Note that the blow−thru design causes dirt
and debris to build up on the inside of the coils. Clean coil
annually or as required by location and outdoor air
conditions. Inspect coil monthly and clean as required. Fins
are not continuous through coil sections. Dirt and debris
may pass through first section, become trapped between
the row of fins and restrict condenser airflow. Use a
flashlight to determine if dirt or debris has collected between
coil sections. Clean coil as follows:
1. Turn off unit power.
2. Using a garden hose or other suitable equipment,
flush coil from the outside to remove dirt. Be sure to
flush all dirt and debris from drain holes in base of
unit. Fan motors are waterproof.
TROUBLESHOOTING
A07402
Fig. 9 - Troubleshooting the Cooling Cycle
International Comfort Products, LLC
Lewisburg, TN 37091 USA