Carrier 38GC - Manual (Page 3)

(Mate one set of MECHANICAL CONNECTION
connections at a time).
1. Loosen nut on Compatible Fitting one turn. Do
not remove. Loosen tube clamp.
2. Remove rubber plug and be sure 0-ring is in the
groove inside the Compatible Fitting.
3. Cut tubing to correct length.
4. Use gage on tag attached to service valve to
mark tube end for correct insertion depth.
Insert tube into Compatible Fitting until it
bottoms. (Tube should be inserted at least as
far as mark on tubing.)
5. Tighten nut until it bottoms on back coupling
flange. Tighten tube clamp.
SWEAT CONNECTION (use refrigerant grade
tubing).
1. Remove locking nut and rubber 0-iing from
inside of fitting. Loosen tube clamp entering
condensing unit base.
Cut tubing to correct length.
Insert tube into 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. Tighten
tube clamp.
Evacuate or purge system with field-supplied
refrigerant.
2
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3.
4.
ELECTRICAL DATA AND WIRING
Wiring — Field wiring must comply with local and
national codes. Install a branch circuit fused
disconnect of adequate size to handle starting
current. When making electrical connections, pro­
vide clearance at unit for refrigerant piping
connections.
LINE POWER is brought thru unit base pan flange
and thru hole provided in control box (Fig. 1). On
38GC101, 38GF106 (230-v, 1-ph) and 38GF103,
104 (208- and 230-v, 3-ph) units, line power
connections are made to pigtails supplied with
unit. Use approved splice connector. Do not use
aluminum field wire for splice connections unless
copper to aluminum adapters is used, and correct
wiring techniques are followed.
On all other models connect line power to
contactor screw power terminals as indicated on
unit label diagram, i.e., connect power leads to
contactor terminals 21 and 23 on single-phase
units, or 21, 22, and 23 on 3-phase units.
On all 3-phase units, do not connect a grounded
high voltage leg to control circuit pigtail or
terminal; connect leg to compressor pigtail or
terminal. See label diagram.
CONTROL POWER is brought thru unit base pan
(Fig. 1), and thru 7/8-in. hole into low voltage
section of control box. All connections are made
to pigtails supplied with unit (Fig. 2). Where
supply voltage exceeds 150 volts to ground, or
local codes require it, ground 24-volt control
circuit at field splice C.
Table 4 — Refrigerant Piping Data
Crankcase heater (standard on GF), liquid line filter-drier (standard on GF)
and start capacitor with relay (accessory on GC101, 102, 103 and GF102)
required Reduce liquid line size one diameter (mini /4-in OD) when evaporator
is below condensing unit
TXV — Thermal Expansion Valve
Cap. Tube — Capillary Tube
*3/4-in on 38GF.