Carrier Air Conditioner 38HDL018 060 User Manual

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  
COOLING  
• 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 ACCURATERCONTROL  
• MAKE PIPING SWEAT CONNECTIONS  
• PROVIDE SAFETY RELIEF  
Fig. 1 — 38HDL Condensing Unit  
Step 4 — Make Electrical Connections . . . . . . . . 4  
• POWER WIRING  
• CONTROL CIRCUIT WIRING  
• CONNECTIONS TO DUCT-FREE  
FAN COIL UNITS  
Before installing or servicing system, always turn off  
main power to system. There may be more than one dis-  
connect switch. Turn off accessory heater power if  
applicable. Electrical shock can cause personal injury.  
Step 5 — Accessory Installation . . . . . . . . . . . . . . 4  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9  
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 11  
Step 1 — Complete Pre-Installation Checks  
UNPACK UNIT — Move unit to final location. Remove car-  
ton from unit, being careful not to damage service valves or  
grilles.  
INSPECT SHIPMENT — File claim with shipping com-  
pany if shipment is damaged or incomplete. Check unit name-  
plate to ensure unit matches job requirements.  
SAFETY CONSIDERATIONS  
Install and servicing air-conditioning equipment can be haz-  
ardous due to system pressure and electrical components. Only  
trained and qualified service personnel should install or serv-  
ice 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 thor-  
oughly. Consult local building codes and National Electrical  
Code (NEC, U.S.A. Standard) for special installation  
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 cen-  
ter of gravity.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 563-899 Printed in U.S.A. Form 38HDL-1SI Pg 1 9-98 Replaces: New  
Tab 3a 2a  
4
 
OPERATING  
WEIGHT  
UNIT  
SIZE  
A
B
C
D
E
F
G
H
J
K
L
M
38HDL  
ft-in.  
2-118  
2-118  
2-118  
2-118  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
ft-in.  
mm  
lb  
kg  
018  
024  
030  
036  
048  
060  
638.2 3-01516  
638.2 3-01516  
638.2 3-01516  
638.2 3-01516  
938.2 1-2916 369.9 1-4  
938.2 1-2916 369.9 1-4  
938.2 1-2916 369.9 1-4  
938.2 1-2916 369.9 1-4  
1131.9 1-5116 433.4 1-6716 468.3 2- 612  
1131.9 1-5116 433.4 1-6716 468.3 2- 612  
406.4 1-11716 595.3 1-5316 436.6 1-512 444.5 1-818  
406.4 1-11716 595.3 1-5316 436.6 1-512 444.5 1-818  
406.4 1-11716 595.3 1-5316 436.6 1-512 444.5 1-818  
406.4 1-11716 595.3 1-5316 436.6 1-512 444.5 1-818  
511.2 1-1  
511.2 1-1  
511.2 1-1  
511.2 1-1  
330.2 0-658 168.3 0-1114 285.8 0-058 15.88 130  
330.2 0-634 171.5 0-1158 295.3 0-058 15.88 136  
330.2 0-634 171.5 0-1158 295.3 0-034 19.05 161  
330.2 0-634 171.5 0-1158 295.3 0-034 19.05 185  
58.9  
61.6  
73.0  
83.9  
100.5  
112.9  
3-1316 944.6 3-8916  
3-1316 944.6 3-8916  
774.7 1-758  
774.7 1-758  
498.5 2-558 752.5 2-8316 817.6 1-178  
352.4 0-814 209.5 0- 4  
406.4 0-078 22.22 222  
498.5 2-558 752.5 2-8316 817.6 1-11116 347.7 0-818 206.4 0- 378 403.2 0-078 22.22 249  
Fig. 2 — 38HDL018-060 — Dimensional Drawing  
 
with a wet cloth, the tubing set can be brazed to the service  
valve using either silver bearing or non-silver bearing braz-  
ing material. Consult local code requirements. Refrigerant  
tubing and indoor coil are ready for leak testing.  
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 dia-  
gram and Fig. 5 and 6. Unit must be grounded.  
NOTE: Unit is shipped with R-22 full factory charge indi-  
cated on nameplate.  
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.  
Pass nitrogen or other inert gas through piping while braz-  
ing to prevent formation of copper oxide.  
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.  
To avoid damage while brazing, service valves should  
be wrapped in a heat-sinking material such as a wet cloth.  
NOTE: Operation of unit on improper line voltage consti-  
tutes abuse and could affect Carrier warranty. See Table 3.  
Do not install unit in system where voltage may fluctuate  
above or below permissible limits.  
When brazing tubing sets to the service valves, a braz-  
ing shield must be used to prevent damage to the painted  
unit surface.  
See Table 3 for recommended fuse sizes. When making  
electrical connections, provide clearance at unit for refrig-  
erant piping connections.  
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.  
Use indoor unit transformer as 24-v (40-va minimum)  
supply for system as shown in Fig. 5 or use accessory  
Step 4 — Make Electrical Connections  
Unit cabinet must have an uninterrupted, unbroken elec-  
trical 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.  
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.  
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 ser-  
viced. Disconnect switch, fuses, and field wiring must be  
Table 1A — Physical Data (English)  
UNIT 38HDL  
018  
18,000  
130  
024  
24,000  
136  
030  
30,000  
161  
036  
36,000  
185  
048  
48,000  
222  
060  
60,000  
249  
NOMINAL CAPACITY (Btuh)  
UNIT OPERATING WEIGHT (lb)  
COMPRESSOR  
Type  
Hermetic  
Copeland  
Scroll  
ZR18KC-PFV  
25/21  
Copeland  
Scroll  
ZR24KC-PFV  
25/21  
Copeland  
Scroll  
Tecumseh  
Reciprocating  
AV5535G  
54/50  
Copeland  
Scroll  
ZR47KC-PFV  
42/38  
Copeland  
Scroll  
ZR57KC-PFV  
56/52  
Model  
Oil (oz) Initial/Recharge  
ZR28KC-PFV  
38/34  
OUTDOOR FAN  
Rpm  
Propeller Type, Direct Drive, Horizontal  
850  
850  
850  
850  
850  
850  
Diameter (in.)...No. of Blades  
Fan Pitch (Deg)  
Motor Hp  
18...3  
18...3  
18...3  
18...3  
24...3  
24...3  
25  
27  
27  
31  
24  
24  
1
1
1
1
1
1
8
8
8
8
4
4  
Nominal Airflow (Cfm)  
1720  
1720  
1720  
1720  
3900  
3900  
OUTDOOR COIL  
Face Area (sq ft)...No. of Rows  
Fins per in.  
Copper Tube, Aluminum Plate Fin  
6.1...1  
20  
6.1...1.5  
20  
6.1...2  
20  
6.1...2  
20  
12.3...1.5  
20  
12.3...1.75  
20  
CONTROLS PRESSURESTAT  
SETTINGS  
Low Pressure  
Cutout (psig)  
7 ± 3  
22 ± 5  
210 F  
Cut-In (psig)  
Fusible Plug  
NOTE: Line sizes are for runs up to 25 feet.  
Table 1B — Physical Data (SI)  
UNIT 38HDL  
018  
5.3  
024  
7.0  
030  
8.8  
036  
10.5  
83.9  
048  
14.1  
060  
17.6  
NOMINAL CAPACITY (kW)  
UNIT OPERATING WEIGHT (kg)  
COMPRESSOR  
58.9  
61.6  
73.0  
100.6  
112.9  
Hermetic  
Type  
Copeland  
Scroll  
ZR18KC-PFV  
.74/.62  
Copeland  
Scroll  
ZR24KC-PFV  
.74/.62  
Copeland  
Scroll  
ZR28KC-PFV  
1.13/1.00  
Tecumseh  
Reciprocating  
AV5535G  
Copeland  
Scroll  
ZR47KC-PFV  
1.25/1.13  
Copeland  
Scroll  
ZR57KC-PFV  
1.66/1.54  
Model  
Oil (L) Initial/Recharge  
1.60/1.48  
OUTDOOR FAN  
R/s  
Propeller Type, Direct Drive, Horizontal  
14.2  
457...3  
25  
14.2  
457...3  
27  
14.2  
457...3  
27  
14.2  
457...3  
31  
14.2  
610...3  
24  
14.2  
610...3  
24  
Diameter (mm)...No. of Blades  
Fan Pitch (Deg)  
Motor kW  
.13  
.09  
.09  
812  
.09  
.19  
.19  
Nominal Airflow (L/s)  
812  
812  
812  
1840  
1840  
OUTDOOR COIL  
Copper Tube, Aluminum Plate Fin  
2
Face Area (m )...No. of Rows  
.57...1  
.8  
.57...1.5  
.8  
.57...2  
.8  
.57...2  
.8  
1.14...1.5  
.8  
1.14...1.75  
.8  
Fins per mm  
CONTROLS PRESSURESTAT  
SETTINGS  
Low Pressure  
Cutout (kPa)  
48 ± 21  
152 ± 34  
99 C  
Cut-In (kPa)  
Fusible Plug  
NOTE: Line sizes are for runs up to 7.6 m.  
5
 
LEGEND  
*The IFR and IFM are located in indoor unit on heating-cooling  
applications. If accessory IFR is required for cooling-only applic-  
tions, locate (IFR) in fan coil.  
C
Contactor (12-va)  
Heating Control  
Indoor-Fan Motor  
Indoor-Fan Relay  
Transformer  
HC  
IFM  
IFR  
TRANS  
NOTE: Refer to unit wiring label for wire colors: BRN to BLU and C  
to Y connections.  
Field Wiring  
Factory Wiring  
Fig. 5 — Typical Control Circuit Connections  
LEGEND  
NEC  
TB  
National Electrical Code  
Terminal Board  
TB Connections  
Field Wiring  
Factory Wiring  
Fig. 6 — Line Power Connections  
6
 
Table 2 — American/European Wire Conversions  
SERVICE  
AMERICAN  
EUROPEAN  
Industry  
Standard  
Size  
American  
Industry  
Standard  
Conversion  
(mm)  
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.  
2
Size (mm )  
18 AWG  
16 AWG  
14 AWG  
12 AWG  
10 AWG  
8 AWG  
0.82  
1.30  
1.0  
1.5  
2.08  
2.5  
3.30  
4.0  
Outdoor Fan — A reinforced wire mount holds the out-  
door fan assembly in place. See Fig. 7 for proper mounting  
positions.  
5.25  
6.0  
6.36  
10.0  
16.0  
25.0  
6 AWG  
13.29  
21.14  
26.65  
33.61  
42.39  
53.49  
67.42  
85.00  
107.19  
4 AWG  
3 AWG  
2 AWG  
35.0  
50.0  
70.0  
95.0  
120.0  
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  
126.64  
151.97  
177.90  
202.63  
253.29  
303.95  
150.0  
185.0  
240.0  
300.0  
DIMENSIONS — in. (mm)  
38HDL018  
38HDL024-036  
38HDL048-060  
LEGEND  
American Wire Gage  
Thousand Circular Mils  
0.433 (11)  
0.709 (18)  
0.16 (4)  
AWG  
kcmil  
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 suc-  
tion (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 Over-  
load — Control resets automatically when internal com-  
pressor 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 ohm-  
meter or continuity tester. If necessary, refer to Carrier Stand-  
ard 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 sys-  
tem 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 inter-  
nal pressure relief valve (indicated by sudden rise  
of suction pressure) before suction pressure reaches  
5 psig (34 kPa). If this occurs, shut off unit imme-  
diately, 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 thermo-  
stat below ambient temperature. Operate unit for 15 min-  
utes, then check system refrigerant charge. See Refrigerant  
Charging section on page 8.  
3. Start unit and run until suction pressure reaches 5 psig  
(34 kPa).  
4. Shut unit off and frontseat suction valve.  
Unit compressor starts after a 5-minute delay if equipped  
with accessory Time GuardII device.  
5. Depressurize low side of unit and recover refrigerant fol-  
lowing accepted practice.  
7
 
Table 3 — Electrical Data  
OPERATIONAL  
VOLTAGE*  
COMPRESSOR  
POWER SUPPLY  
UNIT SIZE  
38HDL  
V-PH-Hz  
Max Fuse† or HACR-Type  
Min  
Max  
RLA  
LRA  
Fan FLA  
MCA  
Ckt Bkr Amps  
018  
024  
030  
036  
048  
060  
10.7  
13.2  
15.7  
14.2  
24.3  
28.6  
47.0  
59.0  
.70  
.70  
14.1  
17.2  
20.3  
18.5  
31.8  
37.2  
25  
30  
35  
30  
50  
65  
73.0  
.70  
208/230-1-60  
LEGEND  
Full Load Amps  
Heating, Air Conditioning, Refrigeration  
Locked Rotor Amps  
187  
254  
86.7  
.70  
131.0  
170.0  
1.45  
1.45  
2. All motors and compressors contain internal overload protection.  
3. In compliance with NEC (U.S.A. Standard) requirements for mul-  
timotor 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 (Under-  
writers’ Laboratories) Standard 465 (U.S.A. Standard).  
FLA  
HACR  
LRA  
MCA  
NEC  
RLA  
Minimum Circuit Amps per NEC Section 430-24  
National Electrical Code (U.S.A. Standard)  
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.  
7. Replace retainer O-ring before reassembling AccuRater  
device (O-ring part no. 99CC501052).  
Low Pressure Switch — This switch, mounted on the  
suction line, has fixed non-adjustable settings. To check pres-  
sure switch, attach pressure gage to suction service valve gage  
port. Slowly close liquid shutoff valve and allow compres-  
sor 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 pres-  
sure shown after accessory CLO (compressor lockout) switch  
has been reset and accessory Time GuardII device has com-  
pleted 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 atmos-  
phere. Remove and reclaim refrigerant following practice.  
Service Valves — The service valves in the outdoor unit  
come from the factory frontseated. This means the refrig-  
erant 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 counter-  
clockwise 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 out-  
door and indoor unit. The service valve cannot be field re-  
paired; only a complete valve or valve stem seal and service  
port caps are available for replacement.  
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. In-  
sulate 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 enter-  
ing outdoor coil and wet-bulb temperature entering  
indoor coil. At this intersection, note the superheat  
temperature.  
AccuRater(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.  
7. Refer to Tables 5A and 5B. Find superheat temperature  
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, care-  
fully 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, seal-  
ing surface around piston cones, and fluted portion of pis-  
ton are not damaged.  
6. Clean piston refrigerant metering hole.  
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 6Aand 6B. Find temperature point at which  
the required subcooling temperature intersects the mea-  
sured liquid line pressure.  
Table 5A — Required Suction-Tube Temperature (F)  
— English (Entering Suction Service Valve)  
SUCTION PRESSURE AT SERVICE PORT (psig)  
61.5 64.2 67.1 70.0 73.0 76.0 79.2 82.4 85.7  
35 36 39 41 43 45 47 49 51  
37 39 41 43 45 47 49 51 53  
39 41 43 45 47 49 51 53 55  
41 43 45 47 49 51 53 55 57  
43 45 47 49 51 53 55 57 59  
45 47 49 51 53 55 57 59 61  
47 49 51 53 55 57 59 61 63  
49 51 53 55 57 59 61 63 65  
51 53 55 57 59 61 63 65 67  
53 55 57 59 61 63 65 67 69  
55 57 59 61 63 65 67 69 71  
57 59 61 63 65 67 69 71 73  
59 61 63 65 67 69 71 73 75  
61 63 65 67 69 71 73 75 77  
63 65 67 69 71 73 75 77 79  
65 67 69 71 73 75 77 79 81  
67 69 71 73 75 77 79 81 83  
69 71 73 75 77 79 81 83 85  
71 73 75 77 79 81 83 85 87  
73 75 77 79 81 83 85 87 89  
75 77 79 81 83 85 87 89 91  
SUPERHEAT  
TEMP (F)  
0
2
4
6
8
10  
12  
14  
16  
18  
20  
22  
24  
26  
28  
30  
32  
34  
36  
38  
40  
4. If the measured liquid line temperature does not agree  
with the required liquid line temperature, ADD refriger-  
ant to lower the temperature, or REMOVE refrigerant to  
raise the temperature (allow a tolerance of ± 3 F).  
Table 4A — Superheat Charging Table — English  
(Superheat Entering Suction Service Valve)  
INDOOR COIL ENTERING AIR (F) WB  
OUTDOOR  
TEMP (F)  
50 52 54 56 58 60 62 64 66 68 70 72 74 76  
55  
60  
9
7
*
*
*
*
*
*
*
*
*
*
*
12 14 17 20 23 26 29 32 35 37 40 42 45  
10 12 15 18 21 24 27 30 33 35 38 40 43  
6 10 13 16 19 21 24 27 30 33 36 38 41  
65  
70  
*
*
*
*
*
*
*
*
*
*
7 10 13 16 19 21 24 27 30 33 36 39  
9 12 15 18 21 24 28 31 34 37  
8 12 15 18 21 25 28 31 35  
8 11 15 19 22 26 30 33  
75  
*
*
*
*
*
*
*
*
*
6
Table 5B — Required Suction-Tube Temperature (C)  
— SI (Entering Suction Service Valve)  
80  
*
5
85  
*
*
*
*
*
*
*
*
*
90  
*
*
*
*
*
*
*
*
*
*
*
*
5
9 13 16 20 24 27 31  
6 10 14 18 22 25 29  
SUCTION PRESSURE AT SERVICE PORT (kPa)  
424 443 463 483 503 524 546 568 591  
OUTDOOR  
TEMP (C)  
95  
*
100  
105  
110  
115  
*
*
*
*
*
8 12 15 20 23 27  
0
1
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
25  
26  
27  
28  
29  
31  
32  
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
25  
26  
27  
28  
29  
31  
32  
33  
*
*
*
5
9 13 17 22 26  
6 11 15 20 25  
*
2
4
5
6
7
8
9
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
25  
26  
27  
28  
29  
31  
*
*
8 14 18 23  
3
5
6
7
8
9
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
25  
26  
27  
28  
29  
4
6
7
8
9
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
25  
26  
27  
28  
LEGEND  
6
7
8
9
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
25  
26  
27  
WB  
Wet Bulb  
7
8
9
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
25  
26  
*Do not attempt to charge system under these conditions or refrig-  
erant slugging may occur.  
8
9
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
25  
9
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
24  
Table 4B — Superheat Charging Table — SI  
(Superheat Entering Suction Service Valve)  
10  
11  
12  
13  
14  
16  
17  
18  
19  
20  
21  
22  
INDOOR COIL ENTERING AIR (C) WB  
OUTDOOR  
TEMP (C)  
10 11 12 13 14 16 17 18 19 20 21 22 23 24  
13  
16  
18  
21  
24  
27  
29  
32  
35  
38  
41  
43  
46  
5
4
*
*
*
*
*
*
*
*
*
*
*
7
6
3
8
7
6
4
9 11 13 14 16 18 19 21 22 23 25  
8 10 12 13 15 17 18 19 21 22 24  
7
6
3
9 11 12 13 15 17 18 20 21 23  
*
7
5
3
9 11 12 13 15 17 18 20 22  
*
*
*
*
*
*
*
*
*
*
7
4
8 10 12 13 16 17 19 21  
*
*
*
*
*
*
*
*
*
7
4
3
8 10 12 14 16 17 19  
*
*
*
*
*
*
*
*
*
6
5
3
8 11 12 14 17 18  
*
*
*
*
*
*
*
*
*
*
*
*
7
6
4
3
9 11 13 15 17  
8 10 12 14 16  
*
*
*
*
*
*
7
5
3
8 11 13 15  
*
*
*
7
6
4
9 12 14  
8 11 14  
8 10 13  
*
*
*
LEGEND  
WB  
Wet Bulb  
*Do not attempt to charge system under these conditions or refrig-  
erant slugging may occur.  
9
 
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 wa-  
ter or blown out with compressed 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 de-  
bris may pass through the first section, become trapped be-  
tween 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:  
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 in-  
tervals described below:  
• Annually, when environment is very dirty, ambient tem-  
perature is higher than 105 F (40 C), and average unit op-  
erating 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 tem-  
perature is less than 105 F (40 C), and unit operating time  
averages less than 8 hours per day.  
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.  
Table 6A — Required Liquid Line Temperature (F) — English (At Service Valve)  
LIQUID PRESSURE AT SERVICE VALVE (PSIG)  
REQUIRED  
SUBCOOLING (F)  
134 141 148 156 163 171 179 187 196 205 214 223 233 243 253 264 274 285 297 309 321 331 346 359  
0
5
76  
71  
66  
61  
56  
51  
79  
74  
69  
64  
59  
54  
82  
77  
72  
67  
62  
57  
85  
80  
75  
70  
65  
60  
88  
83  
78  
73  
68  
63  
91  
86  
81  
76  
71  
66  
94  
89  
84  
79  
74  
69  
97  
92  
87  
82  
77  
72  
100 103 106 109  
112  
115  
110  
118  
113  
121 124 127 130 133 136 139 142 145  
95  
90  
85  
80  
75  
98 101 104 107  
116  
111  
119  
117  
122 125 128 131 134 137 140  
120 123 126 129 129 132 135  
10  
15  
20  
25  
93  
88  
83  
78  
96  
91  
86  
81  
99 102 105 108  
94  
89  
84  
97 100 103 106 109  
112  
98 101 104 107  
93 96  
115  
110  
118  
113  
121 124 127 130  
92  
87  
95  
90  
116  
111  
119  
114  
122 125  
117 120  
99 102 105 108  
Table 6B — Required Liquid Line Temperature (C) — SI (At Service Valve)  
LIQUID PRESSURE AT SERVICE VALVE (PSIG)  
REQUIRED  
SUBCOOLING (C)  
911 969 1030 1061 1121 1186 1219 1286 1360 1397 1471 1547 1588 1671 1755 1800 1885 1976 2026 2125 2222 2264 2379 2475  
0
2
24  
22  
20  
18  
16  
14  
12  
10  
26  
24  
22  
20  
18  
16  
14  
12  
28  
26  
24  
22  
20  
18  
16  
14  
29  
27  
25  
23  
21  
19  
17  
15  
31  
29  
27  
25  
23  
21  
19  
17  
33  
31  
29  
27  
25  
23  
21  
19  
34  
32  
30  
28  
26  
24  
22  
20  
36  
34  
32  
30  
28  
26  
24  
22  
38  
36  
34  
32  
30  
28  
26  
24  
39  
37  
35  
33  
31  
29  
27  
25  
41  
39  
37  
35  
33  
31  
29  
27  
43  
41  
39  
37  
35  
33  
31  
29  
44  
42  
40  
38  
36  
34  
32  
30  
46  
44  
42  
40  
38  
36  
34  
32  
48  
46  
44  
42  
40  
38  
36  
34  
49  
47  
45  
43  
41  
39  
37  
35  
51  
49  
47  
45  
43  
41  
39  
37  
53  
51  
49  
47  
45  
43  
41  
39  
54  
52  
50  
48  
46  
44  
42  
40  
56  
54  
52  
50  
48  
46  
44  
42  
58  
56  
54  
52  
50  
48  
46  
44  
59  
57  
55  
53  
51  
49  
47  
45  
61  
59  
57  
55  
53  
51  
49  
47  
63  
61  
59  
57  
55  
53  
51  
49  
4
6
8
10  
12  
14  
Table 7 — Recommended Compressor Oils  
UNIT 38HDL  
RECOMMENDED  
OIL  
018  
024  
030  
036  
048  
060  
3GS  
Calumet RO-15  
Sontex 200LT  
10  
 
TROUBLESHOOTING CHART — COOLING CYCLE  
 
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  
 

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