Liquid Line Filter Drier; Field Refrigerant Access Ports; Factory High-Flow Access Ports - Carrier 38AUD 16 Series Installation, Start-Up And Service Instructions Manual

Liquid Line Filter Drier —
The factory-provided filter 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 removing a 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 release moisture
and contaminants from drier into system.
Field Refrigerant Access Ports —
Field service access to refrigerant pressures is through the
access ports located at the service valves (see Figs 24 and

26). These ports are -in SAE Flare couplings with


Schrader check 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 service activities 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 23-34 N-cm (2-3 in-lbs).
5/8" HEX
SEAT
1/2-20 UNF RH
0.596
30°
.47
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
Fig. 21 - - CoreMax Access Port Assembly
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. 25 and Fig. 27). These are brass fittings
with black plastic caps. The hose connection fittings are

standard -in SAE Male Flare couplings.


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. 21.) 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 1085 23 N-cm (96 -10 in-lbs) of
torque; do not overtighten.
CORE
(Part No. EC39EZ067)
WASHER
O-RING
1/2" HEX
28
45°
DEPRESSOR PER ARI 720
+.01/-.035
FROM FACE OF BODY
7/16-20 UNF RH
C08453