Carrier Gemini 38AU07 Series Installation Instructions Manual page 35

These ports are / -in. SAE Flare couplings with Schrader
1
4
check valves and service caps. Use these ports to admit nitro-
gen to the field tubing during brazing, to evacuate the tubing
and evaporator coil, to admit initial refrigerant charge into the
low-side of the system and when checking and adjusting the
system refrigerant charge. When service activities are com-
pleted, ensure the service 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. 35 — Typical Exterior, Single-Circuit Unit
(38AUZ*08 shown)
Condenser Fans
Fig. 36 — 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 ser-
vice valve and on the liquid tube near the liquid service valve
(see Fig. 37 and 38). These are brass fittings with black plas-
tic caps. The hose connection fittings are standard
Male Flare couplings.
Service
Valves
Service
Valves
The brass fittings are two-piece High Flow valves, with a
receptacle base brazed to the tubing and an integral spring-
closed check valve core screwed into the base. See Fig. 39.
This check valve is permanently assembled into this core body
and cannot be serviced separately; replace the entire core body
35
Fig. 37 — Typical Interior, Single-Circuit Unit
(38AUZ*08 shown)
Fig. 38 — Typical Interior, Two-Circuit Unit
(38AUD*14 shown)
1 / -in. SAE
4