Refrigeration System Components - Carrier 50TCQD14 Installation Instructions Manual

LOCATION DIMENSION
48--- in (1219 mm)
18--- in (457 mm)
A
18--- in (457 mm)
12--- in (305 mm)
42--- in (1067 mm)
B 36--- in (914 mm)
Special
36--- in (914 mm)
C
18--- in (457 mm)
42--- in (1067 mm)
D
36--- in (914 mm)
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application
planning overhead obstruction or for vertical clearances.
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 header check valve, and heating
liquid line with a check valve and a strainer. Size 14 units
have two compressor- - circuits. See Fig. 4 for typical unit
piping schematic (4- - row
compressor- - circuits is shown).
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 8) and Tables 1 - - 3.
Troubleshooting Refrigerant Pressure Problems and
Check Valves
Refer to Fig. 4 and the Cooling Mode and Heating Mode
tables (Tables 1 and 2).
C
B
CONDITION
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
Check sources of flue products within 10--- ft of unit fresh air intake hood
Side condensate drain is used
Minimum clearance
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
Fig. 3 - - Service Clearance Dimensional Drawing
indoor coil with two
D
A
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 fittings with black plastic caps. The hose connection
1
fittings are standard / - - inch SAE male flare couplings.
4
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. 5 on page 8. 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 and torque to 96 10 in- - lbs (10.9  1 Nm). Do not
exceed 106 in- - lbs (11.9 Nm) when tightening.
Table 1 – Cooling Mode (each circuit)
Component
Reversing Valve
Check Valve A
Check Valve B
Check Valve C
Check Valve D
7
C09897B
Status/Position
Energized
Closed
Open
Closed
Open