Carrier 38CQ - Manual (Page 4)

factory supplied with a No. 8 AccuRater piston for
installation in 28MQ048. For piston replacement
instructions, see AccuRater’’"''^ Servicing on page 15.
Step 6 — Connect Refrigerant Lines to fittings on
unit suction and liquid service valves (Fig. 1).
Liquid service valve has flare fitting; suction service
valve has Compatible Fitting. Make suction line
connection first. Slide flare nut on liquid line, then
flare and connect liquid line. (Do not disassemble
AccuRater.) Unit Compatible Fitting permits
mechanical (quick-connect) or sweat connection as
described below. It is not necessary to flare system
liquid line if an accessory flare to Compatible
Fitting coupler is used for liquid line connection.
See Accessory Coupler (Fig. 5).
38CQ044,048 UNITS - When using 1-1/8 in.
field-supplied suction line, remove suction line
adapter taped to compressor suction line. Sweat
connect refrigerant suction line to 1-1/8 in. end of
adapter. Connect 3/4-in. end of adapter to unit
suction line Compatible Fitting.
When a 7/8-in. field-supplied suction line is
used on 38CQ039, a field-supplied 3/4-in. to
7/8-in. suction line adapter must be provided (not
required if 38CQ accessory tubing is used).
MECHANICAL CONNECTION TO COMPATIBLE
FITTING (Mate one set of connections at a time.)
1. Loosen nut on Compatible Fitting one turn. Do
not remove.
2. Remove plug and be sure 0-ring is in the groove
inside the Compatible Fitting.
3. Cut tubing to correct length.
4.
Insert tube into Compatible Fitting until it
bottoms.
5. Tighten nut until it bottoms on back coupler
flange. Keep tube bottomed in Compatible
Fitting while tightening nut.
SWEAT CONNECTION TO
FITTING (Use refrigerant tubing.)
COMPATIBLE
1
.
rubber 0-ring and
2
.
3.
4.
5.
Remove locking nut,
Schrader core from valve.
Cut tubing to correct length.
Insert tube in Compatible Fitting. Wrap top and
bottom of service valves in wet cloth to prevent
damage by heat. Solder with low temperature
(450 F) silver alloy solder.
Replace Schrader core.
Evacuate or purge system with field-supplied
refrigerant.
ACCESSORY FLARE TO COMPATIBLE COU­
PLER is shown in Fig. 5. Attach flare nut on
coupler to flare fitting on unit liquid service valve.
Connect liquid line to Compatible Fitting using
mechanical or sweat connection. When mechanical
connection is made, use 2 wrenches when tighten­
ing Compatible Fitting nut — one to hold coupler
and one to tighten nut. Liquid line must be flared
if coupler is not used.
Fig. 5 — Accessory Coupler
ELECTRICAL DATA AND WIRING
Field wiring must comply with local and
national fire, safety and electrical codes. Voltage to
unit must be within ± 10% of voltage indicated on
Table 4 — Electrical Data (60-Hz)
UNIT V/PH
OPER
VOLTAGE*
COMPR FAN
FLA
Power
Wire
Size
(AWG)
Max
Ft
Wire
Gnd
Wire
Sizef
(AWG)
Max
Fuse
Ampsi
Max Min LRA RLA
38CQ015 41 9.0 .9 14 31 14 20
38CQ020 65 10.3 .9 12 40 12 20
38CQ027 82 17.7 2.4 10 42 10 40
38CQ033
230/1 254 207
88 19.8 2.4 10 36 10 45
38CQ039 94 22.2 2.4 10 33 10 50
38CQ044 106 25.0 2.4 8 46 8 50
38CQ048 106 25.0 3.0 8 46 8 50
200/ 13.0/ 2.0/ 30/
38CQ033
230/3
254 180 87
11.5 2.0
12 40 12
25
38CQ039 79 17.4 2.4 12 31 12 40
38CQ044 200/3 229 180 87 18.6 2.4 10 35 10 40
38CQ048 87 18.6 3.0 10 35 10 40
38CQ039 67 15.0 2.4 12 41 12 35
38CQ044 230/3 254 207 70 16.7 2.4 12 36 12 35
38CQ048 70 16.7 3.0 12 36 12 35
BRANCH CIRCUIT
FLA — Full Load Amps
LRA — Locked Rotor Amps
RLA — Rated Load Amps
*Permissible limits of the voltage range at which the units will
operate satisfactorily
fRequired when using nonmetallic conduit
^Maximum dual element fuse size
NOTES:
1 Fan motors are 200-v or 230-v, single phase
2 All units have 24-v control circuit which requires external
power source
3 Copper wire sizes based on 60 C Use copper or copper-clad
aluminum wire only Use latest National Electrical Code for
wire sizing
V