38
LiquidLine Filter Drier —
The factory-providedfilter drier is specifically designed to
operate with Puron®. Replace the filter drier with
factory-authorized components only with a filter drier
with desiccant made from 100% molecular sieve grade
XH-11. Filter drier must be replaced whenever the
refrigerant system is opened.
When removinga filter drier, use a tubing cutter to cut the
drier from the system. Do not unsweat a filter drier from
the system. Heat from unsweating will releasemoisture
and contaminantsfrom drier into system.
FieldRefrigerant Access Ports —
Field service access to refrigerant pressures is through the
access ports located at the service valves(see Figs 38 and
40). These ports are 1/4-in SAE Flare couplings with
Schradercheck valves and service caps. Use these ports to
admit nitrogen 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 serviceactivities are completed, 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).
FactoryHigh-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 Figs 39 and 41). These arebrass fittings with
black plastic caps. The hose connection fittings are
standard 1/4-in SAE Male Flare couplings.
The brass fittingsare two-piece High Flow valves, with a
receptacle base brazed to the tubing and an integral
spring-closedcheck valve core screwed into the base. (See
Fig. 35) 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 of the
check valve core without having to recover the entire
system refrigerant charge. Apply compressor refrigerant
oil to the check valve core’s bottom o-ring. Install the
fitting body with 96 ±-10 in-lbs (1085 ±23 N-cm) of
torque; do not overtighten.
1/2-20 UNF RH
30°
0.596
.47
5/8” HEX
SEAT COREWASHER DEPRESSOR PER ARI 720
+.01/-.035
FROM FACE OF BODY
7/16-20 UNF RH
O-RING
45°
1/2" HEX
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
(Part No. EC39EZ067)
C08453
Fig. 35 --CoreMax Access Port Assembly
569J