Carrier 38CQ - Manual (Page 16)

ACCESSORY
FILTER DRIER
SUCTION
SERVICE
PORTAT
SERVICE
VALVE
(HTG CYCLE)
OUTDOOR
COIL
SUCTION
SERVICE
PORT
LIQUID LINE
SERVICE
PORT AT
SERVICE
VALVE
(CL6 CYCLE)
DISCHARGE
SERVICE
PORT AT
SERVICE
VALVE
(HTG CYCLE)
ACCESSORY
FILTER DRIER
BYPASS TYPE
ACCURATOR (PERMITS FLOW
IN EITHER DIRECTION)
STRAINERS
-WAY valve
ACCUMULATOR
iUNIT PIPING
HEATING CYCLE COOLING CYCLE
Fig. 32 — 38CQ Refrigerant Flow Diagrams
SUCTION
SERV^ICE
PORTAT
SERVICE
VALVE
(CLG CYCLE)
Fig. 33 — AccuRater^'^ (Bypass Type) Components
6. Clean piston refrigerant metering hole.
7.
Replace retainer 0-ring before reassembling
bypass type AccuRater. Carrier O-ring part no.
is99CC501052.
LIQUID LINE STRAINER (protects AccuRater)
made of wire mesh is located in the liquid line
inside 38CQ unit behind liquid line service valve.
Liquid line is belled and sweat connected where
strainer is located. If strainer is plugged, unsweat
belled liquid line connection and replace strainer.
Compatible Fitting Repair
LEAKING MECHANICAL CONNECTION -
Frontseat outdoor section service valves and relieve
refrigerant pressure in tubing. Back locknut off
Carrier Compatible Fitting onto tube. Cut fitting
between threads and seal ring bead shown in
Fig. 34. Remove tubing section remaining in
threaded portion of fitting. Discard locknut.
Clean, flux, and insert new tube end into
remaining portion of Carrier Compatible Fitting.
Wrap valve base in wet rag. Heat and apply
low-temperature solder (450 F).
LEAKING SWEAT CONNECTION - Frontseat
service valves and relieve refrigerant pressure in
tubing. Clean and flux area around leak and apply
low-temperature solder (450 F).
Evacuate or purge indoor coil and tubing
system. Add refrigerant charge (seb charging
instructions).
Leaking Flare Connection — Cut and reflare 3/8-in.
system liquid line.
I,
Fig. 34 — Carrier Compatible Fitting
16