32
FIELD REFRIGERANT ACCESS PORTS
Field service access to refrigerant pressures is through the ac-
cess ports located at the service valves (see Fig. 32 and 33).
These ports are
1
/
4
-in. SAE Flare couplings with Schrader
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 complet-
ed, 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).
Fig. 32 — Typical Exterior, Single-Circuit Unit
(569J*08A/B/G/H shown)
Fig. 33 — Typical Exterior, Two-Circuit Unit
(569J*14D/E 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 connection fittings are standard
1
/
4
-in. SAE Male
Flare couplings.
Fig. 34 — Typical Interior, Single-Circuit Unit
(569J*08A/B/G/H shown)
Fig. 35 — Typical Interior, Two-Circuit Unit
(569J*14D/E shown)
The brass fittings are two-piece High Flow valves, with a recep-
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.
CONDENSER FANS
SERVICE
VALVES
CONDENSER FANS
SERVICE
VALVES
OUTDOOR
COIL
OUTDOOR
COIL
