38HDL018-060
Light Commercial Condensing Units
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Step 1 — Complete Pre-Installation
Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
• UNPACK UNIT
• INSPECT SHIPMENT
• CONSIDER SYSTEM REQUIREMENTS
Step 2 — Rig and Mount Unit . . . . . . . . . . . . . . . . . 3
• MOUNTING ON GROUND
• MOUNTING ON ROOF
• RIGGING
Step 3 — Complete Refrigerant Piping
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
• CHECK ACCURATERt CONTROL
• MAKE PIPING SWEAT CONNECTIONS
• PROVIDE SAFETY RELIEF
Step 4 — Make Electrical Connections . . . . . . . . 4
• POWER WIRING
• CONTROL CIRCUIT WIRING
• CONNECTIONS TO DUCT-FREE
FAN COIL UNITS
Step 5 — Accessory Installation . . . . . . . . . . . . . . 4
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 11
SAFETY CONSIDERATIONS
Install and servicing air-conditioning equipment can be hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install or service air-conditioning equipment
Untrained personnel may perform basic maintenance such
as cleaning and replacing filters. All other operations should
be performed by trained service personnel. When working
on air-conditioning equipment, observe safety precautions in
literature, and on tags and labels attached to unit.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for brazing operations. Have a
fire extinguisher available. Read these instructions thoroughly. Consult local building codes and National Electrical
Code (NEC, U.S.A. Standard) for special installation
requirements.
COOLING
Fig. 1 — 38HDL Condensing Unit
Before installing or servicing system, always turn off
main power to system. There may be more than one disconnect switch. Turn off accessory heater power if
applicable. Electrical shock can cause personal injury.
Step 1 — Complete Pre-Installation Checks
UNPACK UNIT — Move unit to final location. Remove carton from unit, being careful not to damage service valves or
grilles.
INSPECT SHIPMENT — File claim with shipping company if shipment is damaged or incomplete. Check unit nameplate to ensure unit matches 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. 1 and 2. Unit
can 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.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 111
Catalog No. 563-899
Printed in U.S.A.
Form 38HDL-1SI
Pg 1
9-98
Replaces: New
Tab 3a 2a
UNIT
SIZE
38HDL
018
024
030
036
048
060
A
ft-in.
2-11⁄8
2-11⁄8
2-11⁄8
2-11⁄8
3-13⁄16
3-13⁄16
B
mm
638.2
638.2
638.2
638.2
944.6
944.6
ft-in.
3-015⁄16
3-015⁄16
3-015⁄16
3-015⁄16
3-89⁄16
3-89⁄16
C
mm
938.2
938.2
938.2
938.2
1131.9
1131.9
ft-in.
1-29⁄16
1-29⁄16
1-29⁄16
1-29⁄16
1-51⁄16
1-51⁄16
D
mm
369.9
369.9
369.9
369.9
433.4
433.4
ft-in.
1-4
1-4
1-4
1-4
1-67⁄16
1-67⁄16
E
mm
406.4
406.4
406.4
406.4
468.3
468.3
ft-in.
1-117⁄16
1-117⁄16
1-117⁄16
1-117⁄16
2- 61⁄2
2- 61⁄2
F
mm
595.3
595.3
595.3
595.3
774.7
774.7
ft-in.
1-53⁄16
1-53⁄16
1-53⁄16
1-53⁄16
1-75⁄8
1-75⁄8
G
mm
436.6
436.6
436.6
436.6
498.5
498.5
ft-in.
1-51⁄2
1-51⁄2
1-51⁄2
1-51⁄2
2-55⁄8
2-55⁄8
H
mm
444.5
444.5
444.5
444.5
752.5
752.5
ft-in.
1-81⁄8
1-81⁄8
1-81⁄8
1-81⁄8
2-83⁄16
2-83⁄16
J
mm
511.2
511.2
511.2
511.2
817.6
817.6
UNIT SIZE
38HDL
ft-in.
1-1
1-1
1-1
1-1
1-17⁄8
1-111⁄16
K
mm
330.2
330.2
330.2
330.2
352.4
347.7
ft-in.
0-65⁄8
0-63⁄4
0-63⁄4
0-63⁄4
0-81⁄4
0-81⁄8
L
mm
168.3
171.5
171.5
171.5
209.5
206.4
ft-in.
0-111⁄4
0-115⁄8
0-115⁄8
0-115⁄8
0- 4
0- 37⁄8
M
mm
285.8
295.3
295.3
295.3
406.4
403.2
ft-in.
0-05⁄8
0-05⁄8
0-03⁄4
0-03⁄4
0-07⁄8
0-07⁄8
mm
15.88
15.88
19.05
19.05
22.22
22.22
OPERATING
WEIGHT
lb
kg
130
58.9
136
61.6
161
73.0
185
83.9
222
100.5
249
112.9
MINIMUM MOUNTING PAD DIMENSIONS
Support Feet
Snow Stand
Ice Stand
ft-in.
mm
ft-in.
mm
ft-in.
mm
018,024,030 1-11 x 3-6 584.2 x 1066.8 2-2 x 3-6 660.4 x 1066.8 2-2 x 3-6 660.4 x 1066.8
and 036
048 and 060 2- 0 x 4-2 609.6 x 1270.0 2-4 x 4-4 711.2 x 1270.0 2-2 x 4-2 660.4 x 1270.0
NOTES:
1. Required clearances: With coil facing wall, allow 69 (156.4 mm) minimum clearance on coil side and
coil end, and 3 ft (914.4 mm) minimum clearance on compressor end and fan side. With fan facing
wall, allow 89 (203.2 mm) minimum clearance on fan side and coil end, and 3 ft (914.4 mm) minimum
clearance on compressor end and coil side. With multi-unit application, arrange units so discharge of
one does not enter inlet of another.
2. Dimensions in parenthesis are in millimeters.
3. Center of gravity
.
2
Fig. 2 — 38HDL018-060 — Dimensional Drawing
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 into unit. Field-fabricated stacking kits can
be used when units are to be stacked. If conditions or local
codes require unit to 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 level platform or
frame at least 6 in. (154 mm) above roof surface. Isolate unit
and tubing from structure.
RIGGING
Be sure unit panels are securely in place prior to
rigging.
Fig. 3 — Lifting Unit with Sling
Keep unit upright. Lift unit using sling. Use cardboard or
padding under sling, and spreader bars to prevent sling damage to unit. See Fig. 3. See Fig. 2 for center of gravity reference. Install unit so coil does not face into prevailing winds.
If this is not possible and constant winds above 25 mph are
expected, use field-fabricated wind baffle.
NOTE: Field-fabricated wind baffles should be used on all
units with accessory low-ambient control.
Field-fabricated snow stand may be used to raise unit when
operation will be required during the winter. Units may also
be wall mounted using the accessory wall mounting kit.
with field-replaceable piston should be supplied with the indoor unit. Refer to AccuRater metering device table in separate indoor unit installation instructions to determine the correct
AccuRater piston size required for the condenser/evaporator
system being installed.
Note that one of 2 types of the AccuRater devices can be
found on the indoor unit. See Fig. 4. Do not interchange components between AccuRater device types. Matching of outdoor unit with indoor unit may require field replacement of
piston. Replace piston, if required, before connecting refrigerant lines. Piston replacement instructions are included
in the indoor unit installation instructions. After system installation is complete, see Refrigerant charging section on
page 8 to check and/or adjust refrigerant charge.
The 38HDL018-060 units may also be installed with units
using a thermostatic expansion valve (TXV). If a TXV is
used, be sure to remove the piston from the indoor coil. See
installation instructions shipped with the TXV for proper positioning and adjustment.
Step 3 — Complete Refrigerant Piping Connections — Outdoor units may be connected to indoor units
using field-supplied tubing of refrigerant grade and condition. See Tables 1A and 1B for correct line sizes. Do not use
less than 10 ft (3 m) of interconnecting tubing.
DO NOT BURY MORE THAN 36 IN. (922 mm) OF
REFRIGERANT PIPE IN THE GROUND. If any section of pipe is buried, there must be a 6 in. (154 m) vertical rise to the valve connections on the outdoor unit.
If more than the recommended length is buried, refrigerant may migrate to the cooler, buried section during
extended periods of system shutdown. This causes
refrigerant slugging and could damage compressor at
start-up.
When more than 50 ft (15.2 m) of interconnecting tubing
and more than 30 ft (9.1 m) of vertical lift is used, refer to
Part 3 of the Carrier System Design Manual for design details, or contact your local distributor.
If either refrigerant tubing or indoor coil is exposed to atmospheric conditions for longer than 5 minutes, it must be
evacuated to 1000 microns to eliminate contamination and
moisture in the system.
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 the structure. Also, when passing refrigerant tubes
through the wall, seal 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.
CHECK ACCURATERt CONTROL — The correct
AccuRater (bypass type) refrigerant control is required for
cooling system capacity optimization. An AccuRater device
TYPE A (BYPASS TYPE)
TYPE B
NOTE: Arrow on AccuRater body points in free-flow direction, away
from the indoor coil.
Fig. 4 — AccuRater Metering Device Components
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 ready for brazing. After wrapping the service valve
3
in compliance with NEC (U.S.A. Standard) and applicable
local codes. Use minimum 60 C wire for field power
connection.
Route power wires through opening in the unit side panel
and connect in unit control box as shown on unit label diagram and Fig. 5 and 6. Unit must be grounded.
CONTROL CIRCUIT WIRING — Control voltage is 24 v.
See Fig. 5 and unit label diagram for field-supplied wiring
details. Route control wire through opening in the unit side
panel to connection in unit control box.
NOTE: For wire runs up to 50 ft (15 m), use no. 18 AWG
(American Wire Gage) insulated wire (35 C minimum). For
50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire. For
more than 75 ft (23 m), use no. 14 AWG insulated wire. See
Table 2 for conversion to European wire sizes.
NOTE: Operation of unit on improper line voltage constitutes abuse and could affect Carrier warranty. See Table 3.
Do not install unit in system where voltage may fluctuate
above or below permissible limits.
See Table 3 for recommended fuse sizes. When making
electrical connections, provide clearance at unit for refrigerant piping connections.
Use indoor unit transformer as 24-v (40-va minimum)
supply for system as shown in Fig. 5 or use accessory
transformer.
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 indoor coil are ready for leak testing.
NOTE: Unit is shipped with R-22 full factory charge indicated on nameplate.
Pass nitrogen or other inert gas through piping while brazing to prevent formation of copper oxide.
To avoid damage while brazing, service valves should
be wrapped in a heat-sinking material such as a wet cloth.
When brazing tubing sets to the service valves, a brazing shield must be used to prevent damage to the painted
unit surface.
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.
Step 4 — Make Electrical Connections
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 the unit ground
lug in control compartment, or conduit approved for
electrical ground when installed in accordance with
NEC, ANSI/NFPA (American National Standards
Institute/National Fire Protection Association) 70 (U.S.A.
Standards), and local electrical codes. Failure to follow
this warning could result in the installer being liable for
personal injury to others.
Before performing service or maintenance, be sure the
indoor unit main power switch is off and indoor blower
has completely stopped. Failure to do so may result in
electrical shock or injury from rotating fan blades.
CONNECTIONS TO DUCT-FREE FAN COIL UNITS —
The 38HDL units are designed for easy match-up to 40QAB,
40QKB, and 40QNB018,024 duct-free fan coils. These units
provide 24-v power for the outdoor unit from the fan coil.
Connect the Y and C terminals of the indoor unit to the blue
and brown wires of the outdoor unit with 20 gage (minimum) thermostat wire.
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 will invalidate any applicable Carrier
warranty.
Step 5 — Accessory Installation — Install all unit
accessories per accessory installation instructions prior to
start-up.
Do not use accessory Time Guardt II device when combining a 38HDL unit with 40QNB indoor units.
When ambient temperature will fall below 55 F (13 C),
accessory low ambient controller (part no. 53DS900060) is
required. When accessory low ambient kit is used, unit should
also be equipped with accessory winter start kit and fieldfabricated wind baffles.
POWER WIRING — Unit is factory-wired for voltage shown
on nameplate. Provide adequate, fused disconnect switch within
sight of 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 be
4
Table 1A — Physical Data (English)
UNIT 38HDL
NOMINAL CAPACITY (Btuh)
UNIT OPERATING WEIGHT (lb)
COMPRESSOR
Type
Model
Oil (oz) Initial/Recharge
OUTDOOR FAN
Rpm
Diameter (in.)...No. of Blades
Fan Pitch (Deg)
Motor Hp
Nominal Airflow (Cfm)
OUTDOOR COIL
Face Area (sq ft)...No. of Rows
Fins per in.
CONTROLS PRESSURESTAT
SETTINGS
Low Pressure
Cutout (psig)
Cut-In (psig)
Fusible Plug
018
18,000
130
024
24,000
136
Copeland
Scroll
ZR18KC-PFV
25/21
850
18...3
25
1⁄8
1720
6.1...1
20
030
30,000
161
036
36,000
185
048
48,000
222
Hermetic
Copeland
Copeland
Tecumseh
Copeland
Scroll
Scroll
Reciprocating
Scroll
ZR24KC-PFV
ZR28KC-PFV
AV5535G
ZR47KC-PFV
25/21
38/34
54/50
42/38
Propeller Type, Direct Drive, Horizontal
850
850
850
850
18...3
18...3
18...3
24...3
27
27
31
24
1⁄8
1⁄8
1 ⁄8
1⁄4
1720
1720
1720
3900
Copper Tube, Aluminum Plate Fin
6.1...1.5
6.1...2
6.1...2
12.3...1.5
20
20
20
20
060
60,000
249
Copeland
Scroll
ZR57KC-PFV
56/52
850
24...3
24
1⁄4
3900
12.3...1.75
20
7±3
22 ± 5
210 F
NOTE: Line sizes are for runs up to 25 feet.
Table 1B — Physical Data (SI)
UNIT 38HDL
NOMINAL CAPACITY (kW)
UNIT OPERATING WEIGHT (kg)
COMPRESSOR
Type
Model
Oil (L) Initial/Recharge
OUTDOOR FAN
R/s
Diameter (mm)...No. of Blades
Fan Pitch (Deg)
Motor kW
Nominal Airflow (L/s)
OUTDOOR COIL
Face Area (m2)...No. of Rows
Fins per mm
CONTROLS PRESSURESTAT
SETTINGS
Low Pressure
Cutout (kPa)
Cut-In (kPa)
Fusible Plug
018
5.3
58.9
024
7.0
61.6
030
8.8
73.0
Copeland
Scroll
ZR18KC-PFV
.74/.62
Copeland
Scroll
ZR24KC-PFV
.74/.62
14.2
457...3
25
.13
812
14.2
457...3
27
.09
812
.57...1
.8
.57...1.5
.8
036
10.5
83.9
048
14.1
100.6
Hermetic
Copeland
Tecumseh
Copeland
Scroll
Reciprocating
Scroll
ZR28KC-PFV
AV5535G
ZR47KC-PFV
1.13/1.00
1.60/1.48
1.25/1.13
Propeller Type, Direct Drive, Horizontal
14.2
14.2
14.2
457...3
457...3
610...3
27
31
24
.09
.09
.19
812
812
1840
Copper Tube, Aluminum Plate Fin
.57...2
.57...2
1.14...1.5
.8
.8
.8
48 ± 21
152 ± 34
99 C
NOTE: Line sizes are for runs up to 7.6 m.
5
060
17.6
112.9
Copeland
Scroll
ZR57KC-PFV
1.66/1.54
14.2
610...3
24
.19
1840
1.14...1.75
.8
C
HC
IFM
IFR
TRANS
—
—
—
—
—
LEGEND
Contactor (12-va)
Heating Control
Indoor-Fan Motor
Indoor-Fan Relay
Transformer
Field Wiring
Factory Wiring
*The IFR and IFM are located in indoor unit on heating-cooling
applications. If accessory IFR is required for cooling-only applictions, locate (IFR) in fan coil.
NOTE: Refer to unit wiring label for wire colors: BRN to BLU and C
to Y connections.
Fig. 5 — Typical Control Circuit Connections
LEGEND
NEC — National Electrical Code
TB
— Terminal Board
TB Connections
Field Wiring
Factory Wiring
Fig. 6 — Line Power Connections
6
Table 2 — American/European Wire Conversions
Industry
Standard
Size
18 AWG
16 AWG
14 AWG
12 AWG
10 AWG
8 AWG
6 AWG
4 AWG
3 AWG
2 AWG
1 AWG
1/0 AWG
2/0 AWG
3/0 AWG
4/0 AWG
250 kcmil
300 kcmil
350 kcmil
400 kcmil
500 kcmil
600 kcmil
AMERICAN
American
Conversion
(mm)
0.82
1.30
2.08
3.30
5.25
6.36
13.29
21.14
26.65
33.61
42.39
53.49
67.42
85.00
107.19
126.64
151.97
177.90
202.63
253.29
303.95
SERVICE
EUROPEAN
Industry
Standard
Size (mm2)
1.0
1.5
2.5
4.0
6.0
10.0
16.0
25.0
—
35.0
50.0
—
70.0
95.0
120.0
150.0
—
185.0
240.0
300.0
—
Before performing recommended maintenance, be
sure unit main power switch is off. Failure to do so may
result in electrical shock or injury from rotating fan blade.
Outdoor Fan — A reinforced wire mount holds the outdoor fan assembly in place. See Fig. 7 for proper mounting
positions.
38HDL018
0.433 (11)
LEGEND
AWG — American Wire Gage
kcmil — Thousand Circular Mils
DIMENSIONS — in. (mm)
38HDL024-036
38HDL048-060
0.709 (18)
0.16 (4)
Fig. 7 — Condenser Fan Mounting Positions
High-Pressure Relief Valve — Valve is located in
compressor. Relief valve opens at a pressure differential of
approximately 450 ± 50 psig (3100 ± 345 kPa) between suction (low side) and discharge (high side) to allow pressure
equilization.
START-UP
Preliminary Checks
1. Check that all internal wiring connections are tight and
that barriers, covers, and panels are in place.
2. Make certain field electrical power source agrees with unit
nameplate rating.
3. Open all service valves.
Internal Current and Temperature Sensitive Overload — 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. If necessary, refer to Carrier Standard Systems Techniques Manual, Chapter 2, for complete
information.
Leak Test — Field piping and fan coil must be leak tested
by pressure method described in Carrier Standard Service
Techniques Manual, Chapter 1, Section 1-6. Use R-22 at
approximately 25 psig (172 kPa) backed up with an inert gas
to a total pressure not to exceed 245 psig (1690 kPa).
Pumpdown Procedure — The system may be pumped
down in order to make repairs on low side without losing
complete refrigerant charge.
To pumpdown:
1. Attach pressure gage to suction service valve gage port.
2. Frontseat the liquid line valve.
Evacuate and Dehydrate — Field piping and fan coil
must be evacuated and dehydrated by either of the methods
described in Carrier Standard Service Techniques Manual,
Chapter 1, Section 1-7.
Charge System — Release factory charge into system by opening (backseating) liquid and suction line service
valves. Add charge amount as required for the total system.
Refer to separate indoor unit installation instructions for the
required total system charge when connected to the indoor
unit.
The 38HDL unit coils hold only the factory-designated
amount of refrigerant. Additional refrigerant may cause
units to relieve pressure through compressor internal pressure relief valve (indicated by sudden rise
of suction pressure) before suction pressure reaches
5 psig (34 kPa). If this occurs, shut off unit immediately, then frontseat the suction valve and remove
and reclaim excess refrigerant following accepted
practice.
To Start Unit
NOTE: When using in conjunction with 40QAB, 40QKB,
or 40QNB fan coils, refer to start-up instructions included
with fan coil for correct start-up procedures.
Be sure that 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 8.
Unit compressor starts after a 5-minute delay if equipped
with accessory Time Guardt II device.
3. Start unit and run until suction pressure reaches 5 psig
(34 kPa).
4. Shut unit off and frontseat suction valve.
5. Depressurize low side of unit and recover refrigerant following accepted practice.
7
Table 3 — Electrical Data
UNIT SIZE
38HDL
018
024
030
036
048
060
V-PH-Hz
OPERATIONAL
VOLTAGE*
Min
208/230-1-60
187
COMPRESSOR
POWER SUPPLY
Max
RLA
LRA
Fan FLA
MCA
254
10.7
13.2
15.7
14.2
24.3
28.6
47.0
59.0
73.0
86.7
131.0
170.0
.70
.70
.70
.70
1.45
1.45
14.1
17.2
20.3
18.5
31.8
37.2
Max Fuse† or HACR-Type
Ckt Bkr Amps
25
30
35
30
50
65
LEGEND
FLA
— Full Load Amps
HACR — Heating, Air Conditioning, Refrigeration
LRA
— Locked Rotor Amps
MCA — Minimum Circuit Amps per NEC Section 430-24
NEC
— National Electrical Code (U.S.A. Standard)
RLA
— Rated Load Amps (Compressor)
*Permissible limits of the voltage range at which unit will operate
satisfactorily.
†Time-delay fuse.
NOTES:
1. Control circuit is 24 v on all units and requires an external power
source.
2. All motors and 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 HACR breaker.
4. Motor RLA values are established in accordance with UL (Underwriters’ Laboratories) Standard 465 (U.S.A. Standard).
Low Pressure Switch — This switch, mounted on the
7. Replace retainer O-ring before reassembling AccuRater
device (O-ring part no. 99CC501052).
suction line, has fixed non-adjustable settings. To check pressure switch, attach pressure gage to suction service valve gage
port. Slowly close liquid shutoff valve and allow compressor to pump down. Do not allow compressor to pump down
below 2 psig (14 kPa). Compressor should shut down when
suction pressure drops to cutout pressure in Tables 1A and
1B, and should restart when pressure builds up to cut-in pressure shown after accessory CLO (compressor lockout) switch
has been reset and accessory Time Guardt II device has completed its timing cycle.
Refrigerant Charging
To prevent personal injury, wear safety glasses and gloves
when handling refrigerant. Do not overcharge system
— this can cause compressor flooding.
NOTE: Do not vent or depressurize unit refrigerant to atmosphere. Remove and reclaim refrigerant following practice.
SUPERHEAT METHOD (COOLING, NON-TXV) — To
check and adjust charge during cooling season, use Tables
4A-5B and the following procedure:
1. Operate unit a minimum of 15 minutes before checking
charge.
2. Measure suction pressure by attaching a gage to suction
valve service port.
3. Measure suction line temperature by attaching a service
thermometer to unit suction line near suction valve. Insulate thermometer for accurate readings.
4. Measure outdoor coil inlet-air dry bulb temperature with
a second thermometer.
5. Measure indoor coil inlet-air wet bulb temperature with
a sling psychrometer.
6. Refer to Tables 4A and 4B. Find air temperature entering outdoor coil and wet-bulb temperature entering
indoor coil. At this intersection, note the superheat
temperature.
7. Refer to Tables 5A and 5B. Find superheat temperature
and suction pressure and note suction line temperature.
8. If unit has higher suction line temperature than charted
temperature, add refrigerant until charted temperature,
add refrigerant until charted temperature is reached.
9. If unit has lower suction line temperature than charted
temperature, remove and recover refrigerant until charted
temperature is reached.
10. If air temperature entering outdoor coil or pressure at
suction valve changes, charge to new suction line temperature indicated on chart.
NOTE: The above procedure is independent of indoor air
quantity.
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
acceptable heat sink material on the valve before brazing.
The service valves must be backseated (turned counterclockwise until seated) before the service port caps can be
removed and the hoses of the gage manifold connected. In
this position, refrigerant has access from the through outdoor and indoor unit. The service valve cannot be field repaired; only a complete valve or valve stem seal and service
port caps are available for replacement.
AccuRaterT (Bypass Type) Device — See Fig. 4
for bypass type AccuRater device components. The piston
has a refrigerant metering hole through it. The retainer forms
a stop for the piston in the refrigerant bypass mode and a
sealing surface for liquid line flare connection. To check, clean
or replace piston:
1. Shut off power to unit.
2. Pump down using Pumpdown Procedure section on
page 7.
3. Remove liquid line flare connection from AccuRater
device.
4. Pull retainer out of body, being careful not to scratch flare
sealing surface. If retainer does not pull out easily, carefully use locking pliers to remove retainer.
5. Slide piston out by inserting a small soft wire, with small
kinks, through metering hole. Ensure metering hole, sealing surface around piston cones, and fluted portion of piston are not damaged.
6. Clean piston refrigerant metering hole.
8
Table 5A — Required Suction-Tube Temperature (F)
— English (Entering Suction Service Valve)
SUBCOOLING METHOD (COOLING, TXV) — To check
and adjust charge during cooling season, use Tables 6A and
6B 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 liquid pressure at liquid line service
valve. Use a digital thermometer for all temperature
measurements. DO NOT use mercury or dial-type
thermometers.
3. Refer to Tables 6A and 6B. Find 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).
SUPERHEAT SUCTION PRESSURE AT SERVICE PORT (psig)
TEMP (F) 61.5 64.2 67.1 70.0 73.0 76.0 79.2 82.4 85.7
0
35 36 39 41 43 45 47 49 51
2
37 39 41 43 45 47 49 51 53
4
39 41 43 45 47 49 51 53 55
6
41 43 45 47 49 51 53 55 57
8
43 45 47 49 51 53 55 57 59
10
45 47 49 51 53 55 57 59 61
12
47 49 51 53 55 57 59 61 63
14
49 51 53 55 57 59 61 63 65
16
51 53 55 57 59 61 63 65 67
18
53 55 57 59 61 63 65 67 69
20
55 57 59 61 63 65 67 69 71
22
57 59 61 63 65 67 69 71 73
24
59 61 63 65 67 69 71 73 75
26
61 63 65 67 69 71 73 75 77
28
63 65 67 69 71 73 75 77 79
30
65 67 69 71 73 75 77 79 81
32
67 69 71 73 75 77 79 81 83
34
69 71 73 75 77 79 81 83 85
36
71 73 75 77 79 81 83 85 87
38
73 75 77 79 81 83 85 87 89
40
75 77 79 81 83 85 87 89 91
Table 4A — Superheat Charging Table — English
(Superheat Entering Suction Service Valve)
OUTDOOR
TEMP (F) 50
55
9
60
7
65
*
70
*
75
*
80
*
85
*
90
*
95
*
100
*
105
*
110
*
115
*
52
12
10
6
*
*
*
*
*
*
*
*
*
*
INDOOR COIL ENTERING AIR (F)
54 56 58 60 62 64 66 68 70
14 17 20 23 26 29 32 35 37
12 15 18 21 24 27 30 33 35
10 13 16 19 21 24 27 30 33
7 10 13 16 19 21 24 27 30
*
6 9 12 15 18 21 24 28
* *
5 8 12 15 18 21 25
* * * *
8 11 15 19 22
* * * *
5 9 13 16 20
* * * * *
6 10 14 18
* * * * * *
8 12 15
* * * * * *
5 9 13
* * * * * * *
6 11
* * * * * * * *
8
WB
72 74
40 42
38 40
36 38
33 36
31 34
28 31
26 30
24 27
22 25
20 23
17 22
15 20
14 18
76
45
43
41
39
37
35
33
31
29
27
26
25
23
Table 5B — Required Suction-Tube Temperature (C)
— SI (Entering Suction Service Valve)
OUTDOOR SUCTION
TEMP (C) 424 443
0
2
3
1
3
4
2
4
5
3
5
6
4
6
7
6
7
8
7
8
9
8
9
11
9
11
12
10
12
13
11
13
14
12
14
15
13
15
16
14
16
17
16
17
18
17
18
19
18
19
21
19
21
22
20
22
23
21
23
24
22
24
25
LEGEND
WB — Wet Bulb
*Do not attempt to charge system under these conditions or refrigerant slugging may occur.
Table 4B — Superheat Charging Table — SI
(Superheat Entering Suction Service Valve)
OUTDOOR
TEMP (C) 10
13
5
16
4
18
*
21
*
24
*
27
*
29
*
32
*
35
*
38
*
41
*
43
*
46
*
11
7
6
3
*
*
*
*
*
*
*
*
*
*
INDOOR COIL ENTERING AIR (C) WB
12 13 14 16 17 18 19 20 21 22 23
8 9 11 13 14 16 18 19 21 22 23
7 8 10 12 13 15 17 18 19 21 22
6 7 9 11 12 13 15 17 18 20 21
4 6 7 9 11 12 13 15 17 18 20
*
3 5 7 8 10 12 13 16 17 19
* *
3 4 7 8 10 12 14 16 17
* * * *
4 6 8 11 12 14 17
* * * *
3 5 7 9 11 13 15
* * * * *
3 6 8 10 12 14
* * * * * *
4 7 8 11 13
* * * * * *
3 5 7 9 12
* * * * * * *
3 6 8 11
* * * * * * * *
4 8 10
24
25
24
23
22
21
19
18
17
16
15
14
14
13
LEGEND
WB — Wet Bulb
*Do not attempt to charge system under these conditions or refrigerant slugging may occur.
9
PRESSURE AT SERVICE PORT (kPa)
463 483 503 524 546 568 591
4
5
6
7
8
9
11
5
6
7
8
9
11
12
6
7
8
9
11
12
13
7
8
9
11
12
13
14
8
9
11
12
13
14
15
9
11
12
13
14
15
16
11
12
13
14
15
16
17
12
13
14
15
16
17
18
13
14
15
16
17
18
19
14
15
16
17
18
19
21
15
16
17
18
19
21
22
16
17
18
19
21
22
23
17
18
19
21
22
23
24
18
19
21
22
23
24
25
19
21
22
23
24
25
26
21
22
23
24
25
26
27
22
23
24
25
26
27
28
23
24
25
26
27
28
29
24
25
26
27
28
29
31
25
26
27
28
29
31
32
26
27
28
29
31
32
33
COMPRESSOR — Compressor contains factory oil charges;
replace oil when lost. See Tables 1A and 1B for oil recharge
and refer to Carrier Standard Service Techniques Manual,
Chapter 1, pages 1 to 21 for oil recharging procedure. See
Table 7 for recommended compressor oils.
MAINTENANCE
Before performing recommended maintenance, be sure
unit main power is off. Failure to do so may result in
electrical shock or injury from rotating fan blades.
Cleaning Coils — Coil should be washed out with water or blown out with compressed air. Note that the blowthru 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 the first section, become trapped between the rows 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. Use a garden hose or other suitable equipment to flush
coil from the outside to remove dirt. Be sure to flush all
dirt and debris from drain holes in the base of unit. Fan
motors are waterproof.
Lubrication
FAN-MOTOR BEARINGS — Oiling holes are provided at
each end of the condenser-fan motor. Remove fan motor and
lubricate motor with 32 drops (16 drops per hole) of SAE-10
(Society of Automotive Engineers) non-detergent oil at intervals described below:
• Annually, when environment is very dirty, ambient temperature is higher than 105 F (40 C), and average unit operating time exceeds 15 hours a day, or
• Every three years, when environment is reasonably clean,
ambient temperature is less than 105 F (40 C), and unit
operating time averages 8 to 15 hours per day, or
• Every 5 years when environment is clean, ambient temperature is less than 105 F (40 C), and unit operating time
averages less than 8 hours per day.
Table 6A — Required Liquid Line Temperature (F) — English (At Service Valve)
REQUIRED
SUBCOOLING (F)
0
5
10
15
20
25
134
76
71
66
61
56
51
141
79
74
69
64
59
54
148
82
77
72
67
62
57
156
85
80
75
70
65
60
163
88
83
78
73
68
63
171
91
86
81
76
71
66
179
94
89
84
79
74
69
187
97
92
87
82
77
72
LIQUID PRESSURE AT SERVICE VALVE (PSIG)
196 205 214 223 233 243 253 264
100 103 106 109
112
115
118
121
95
98 101 104 107
110
113
116
90
93
96
99 102 105 108
111
85
88
91
94
97 100 103 106
80
83
86
89
92
95
98 101
75
78
81
84
87
90
93
96
274
124
119
117
109
104
99
285
127
122
120
112
107
102
297
130
125
123
115
110
105
309
133
128
126
118
113
108
321
136
131
129
121
116
111
331
139
134
129
124
119
114
346
142
137
132
127
122
117
359
145
140
135
130
125
120
2222
58
56
54
52
50
48
46
44
2264
59
57
55
53
51
49
47
45
2379
61
59
57
55
53
51
49
47
2475
63
61
59
57
55
53
51
49
Table 6B — Required Liquid Line Temperature (C) — SI (At Service Valve)
REQUIRED
SUBCOOLING (C)
0
2
4
6
8
10
12
14
911
24
22
20
18
16
14
12
10
969
26
24
22
20
18
16
14
12
1030
28
26
24
22
20
18
16
14
1061
29
27
25
23
21
19
17
15
1121
31
29
27
25
23
21
19
17
1186
33
31
29
27
25
23
21
19
1219
34
32
30
28
26
24
22
20
1286
36
34
32
30
28
26
24
22
LIQUID PRESSURE AT SERVICE VALVE (PSIG)
1360 1397 1471 1547 1588 1671 1755 1800
38
39
41
43
44
46
48
49
36
37
39
41
42
44
46
47
34
35
37
39
40
42
44
45
32
33
35
37
38
40
42
43
30
31
33
35
36
38
40
41
28
29
31
33
34
36
38
39
26
27
29
31
32
34
36
37
24
25
27
29
30
32
34
35
Table 7 — Recommended Compressor Oils
RECOMMENDED
OIL
018
024
3GS
Calumet RO-15
Sontex 200LT
•
•
UNIT 38HDL
030
036
•
•
•
048
060
•
•
10
1885
51
49
47
45
43
41
39
37
1976
53
51
49
47
45
43
41
39
2026
54
52
50
48
46
44
42
40
2125
56
54
52
50
48
46
44
42
TROUBLESHOOTING CHART — COOLING CYCLE
TROUBLESHOOTING
11
Copyright 1998 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 111
Catalog No. 563-899
Printed in U.S.A.
Form 38HDL-1SI
Pg 12
9-98
Replaces: New
Tab 3a 2a