Carrier Gemini 38AU Series Installation, Start-Up And Service Instructions Manual page 32

FIELD REFRIGERANT ACCESS PORTS
Field service access to refrigerant pressures is through the access
ports located at the service valves (see Fig. 32 and 33). These ports
are / -in. SAE Flare couplings with Schrader check valves and
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4
service caps. Use these ports to admit nitrogen to the field tub-
ing during brazing, to evacuate the tubing and evaporator coil,
to admit initial refrigerant charge into the low-side of the sys-
tem and when checking and adjusting the system refrigerant
charge. When service activities are completed, ensure the ser-
vice caps are in place and secure; check for leaks. If the
Schrader check valve must be removed and re-installed, tighten
to 2-3 in.-lbs (23-34 N-cm).
CONDENSER FANS
Fig. 32 — Typical Exterior, Single-Circuit Unit
(38AUZ*08 shown)
CONDENSER FANS
Fig. 33 — Typical Exterior, Two-Circuit Unit
(38AUD*14 shown)
FACTORY HIGH-FLOW ACCESS PORTS
There are two additional access ports in the system - on the suction
tube between the compressor and the suction service valve and on
the liquid tube near the liquid service valve (see Fig. 34 and 35).
These are brass fittings with black plastic caps. The hose connec-
tion fittings are standard
Fig. 34 — Typical Interior, Single-Circuit Unit
SERVICE
VALVES
SERVICE The brass fittings are two-piece High Flow valves, with a recep-
VALVES
tacle base brazed to the tubing and an integral spring-closed
check valve core screwed into the base. See Fig. 36. This check
valve is permanently assembled into this core body and cannot
be serviced separately; replace the entire core body if necessary.
Service tools are available from RCD that allow the replacement
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/ -in. SAE Male Flare couplings.
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4
(38AUZ*08 shown)
Fig. 35 — Typical Interior, Two-Circuit Unit
(38AUD*14 shown)
OUTDOOR
COIL
OUTDOOR
COIL