Carrier 48TC series, Service And Maintenance Instructions, Page: 10 / 112

10
Refrigerant System Pressure Access Ports
There are two access ports in the system - on the suction tube near
the compressor and on the discharge tube near the compressor.
These are brass fittings with black plastic caps. The hose connec -
tion fittings are standard
1
/
4
-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. 15). This Schrader
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 (P/N P920-0010) that allow
the replacement of the Schrader valve core without having to re -
cover the entire system refrigerant charge. Apply compressor re -
frigerant oil to the Schrader valve core’s bottom O-ring. Install the
fitting body with 96 ± 10 in.-lb (10.85 ± 1.13 Nm) of torque; do
not overtighten.
NOTE: The high flow valve has a black plastic cap with a rubber
O-ring located inside the cap. This rubber O-ring must be in place
in the cap to prevent refrigerant leaks.
Fig. 15 — CoreMax 1 Access Port Assembly
1. CoreMax is a registered trademark of Fastest, Inc.
5/8
” HEX
0.47
30°
0.596
1/2-20 UNF RH
1/2
” HEX
45°
WASHER
O-RING
7/16-20 UNF RH
DEPRESSOR PER AHRI 720
+.01/-.035
FROM FACE OF BODY
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
SEAT CORE
(Part No. EC39EZ067)