6
Fig. 3 — Service Clearance Dimensional Drawing
REFRIGERATION SYSTEM COMPONENTS
Each heat pump refrigeration system includes a compressor,
accumulator, reversing valve, dual-function outdoor coil with
vapor header check valve, cooling liquid line with a filter drier
and a check valve, dual-function indoor coil with a vapor head-
er check valve, and heating liquid line with a check valve and a
strainer. See Fig. 4 for typical unit piping schematic.
Dual-function outdoor and indoor coils are designed to provide
parallel coil circuits during evaporator-function operation and
converging coil circuits during the condenser-function operation.
Reversing Valve and Check Valve Position
See Fig. 4 (on page 7) and Tables 2-4.
Troubleshooting Refrigerant Pressure Problems
and Check Valves
Refer to Fig. 4 and Tables 2 and 3.
REFRIGERANT SYSTEM PRESSURE ACCESS PORTS
There are two access ports on the suction tube and the dis-
charge tube near the compressor. These are brass fittings with
black plastic caps. The hose connection fittings are standard
1
/
4
-in. SAE male flare couplings.
The brass fittings are two-piece High Flow valves, with a re-
ceptacle base brazed to the tubing and an integral spring-closed
check valve core screwed into the base. See Fig. 5 on page 7.
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 re-
cover the entire system refrigerant charge. Apply compressor
refrigerant oil to the check valve core’s bottom O-ring. Install
the fitting body and torque to 96 ±10 in. lbs (10.9 ±1 Nm). Do
not exceed 106 in. lbs (11.9 Nm) when tightening.
C
B
A
D
LOCATION DIMENSION CONDITION
A
48-in. (1219 mm) Unit disconnect is mounted on panel
18-in. (457 mm) No disconnect, convenience outlet option
18-in. (457 mm) Recommended service clearance
12-in. (305 mm) Minimum clearance
B
42-in. (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall)
36-in. (914 mm) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Special Check sources of flue products within 10 ft of unit fresh air intake hood
C
36-in. (914 mm) Side condensate drain is used
18-in. (457 mm) Minimum clearance
D
42-in. (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
36-in. (914 mm) Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
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