Refrigeration System Components - Carrier WeatherMaker 50KCQ A04 Series Installation Instructions Manual

REFRIGERATION SYSTEM COMPONENTS

Typical Unit Piping
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. 7 and Tables 2-4 for typical unit piping sche-
matic. Dual-function outdoor and indoor coils are designed to
provide parallel coil circuits during evaporator-function opera-
tion and converging coil circuits during the condenser-function
operation.
Reversing Valve and Check Valve Position
See Fig. 7 and Tables 2-4.
Troubleshooting Refrigerant Pressure Problems
and Check Valves
Refer to Fig. 7 and Tables 2 and 3.
Refrigerant System Pressure Access Ports
There are two access ports in each circuit - on the suction tube
and the discharge tube near the compressor. These are brass fit-
tings with black plastic caps. The hose connection fittings are
1
standard / -in. SAE male flare couplings.
4
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. 8. This check
valve is permanently assembled into this core body and cannot
be serviced separately. Replace the entire core body if neces-
sary. Service tools are available from RCD that allow the re-
placement of the check valve core without having to recover
the entire system refrigerant charge. Apply compressor refrig-
erant oil to the check valve core's bottom O-ring. Install the fit-
ting body and torque to 96 ± 10 in.-lb (10.9 ± 1 Nm). Do not
exceed 106 in.-lb (11.9 Nm) when tightening.
Filter
Drier
DFT 1
Acutrol
Outdoor Coil
LPS/LOC
B
Check Valve
A
Accurater
(3 and 4 ton units only)
Fig. 7 — Typical Unit Piping Schematic
Table 2 — Cooling Mode (each circuit)
COMPONENT
Reversing Valve
Check Valve A
Check Valve B
Check Valve C
Check Valve D
Table 3 — Heating Mode (each circuit)
COMPONENT
Reversing Valve
Check Valve A
Check Valve B
Check Valve C
Check Valve D
Table 4 — Defrost Mode
A04-A06 Circuit 2
COMPONENT
Defrost Thermostat
Outdoor Fan(s)
Reversing Valve
Check Valve A
Check Valve B
Check Valve C
Check Valve D
Cooling Liquid Line
D
HPS
Indoor Coil
C Strainer
Heating Mode Liquid Line
9
STATUS/POSITION
Energized
Closed
Open
Closed
Open
STATUS/POSITION
De-energized
Open
Closed
Open
Closed
STATUS/POSITION
Closed
Off
Energized
Closed
Open
Closed
Open
Acutrol
Accurater
(all 3, 4, and
5 ton units)
* Schematic shown in Heating Mode.