10
C
B
D
A
C12392
LOCATION
DIMENSION
CONDITION
A
36---in. (914 mm)
• Recommended clearance for air flow and service
B
42---in. (1067 mm)
• Recommended clearance for air flow and service
C
18---in. (457 mm)
• No Convenience Outlet
• No Economizer
• No field installed disconnect on economizer hood side (Factory---installed disconnect installed).
36---in. (914 mm)
• Convenience Outlet installed.
• Vertical surface behind servicer is electrically non---conductive (e.g.: wood, fiberglass).
42---in. (1067 mm)
• Convenience Outlet installed.
• Vertical surface behind servicer is electrically conductive (e.g.: metal, masonry).
96---in. (2438 mm)
• Economizer and/or Power Exhaust installed.
• Check for sources of flue products with 10 feet (3 meters) of economizer fresh air intake.
D
42---in. (1067 mm)
• Recommended clearance for service.
NOTE:
Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning
overhead obstruction or for vertical clearances.
Fig. 4 -- 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 header check valve, and heating
liquid line with a check valve and a strainer. Size 14 units
have two compressor--circuits. See Fig. 5 for typical unit
piping schematic (4--row indoor coil with two
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. 5 (on page 11) and Tables 1 -- 3.
Troubleshooting Refrigerant Pressure Problems and
Check Valves
Refer to Fig. 5 and the Cooling Mode and Heating Mode
tables (Tables 1 and 2).
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
fittings are standard
1
/
4
--inch 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. 6 on page 11. 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 Replacement Components 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
Status/Position
Reversing Valve
Energized
Check Valve A
Closed
Check Valve B
Open
Check Valve C
Closed
Check Valve D
Open
Summary of Contents for 548J*17 D Series
Page 4: ...4 a548J 015 Fig 2 Unit Dimensional Drawing Size 17 Units ...
Page 5: ...5 a548J 016 Fig 2 Unit Dimensional Drawing Size 17 Units cont ...
Page 6: ...6 a548J 017 Fig 2 Unit Dimensional Drawing Size 17 Units cont ...
Page 7: ...7 a548J 018 Fig 3 Unit Dimensional Drawing Size 24 Units ...
Page 8: ...8 a548J 019 Fig 3 Unit Dimensional Drawing Size 24 Units cont ...
Page 9: ...9 a548J 020 Fig 3 Unit Dimensional Drawing Size 24 Units cont ...
Page 13: ...13 C10139 Fig 7 Roof Curb Details Size 17 Units ...
Page 14: ...14 C10140 Fig 8 Roof Curb Details Size 24 Units ...
Page 19: ...19 a50 9696 Fig 20 548J 17 24 Control Wiring Diagram with VFD Option ...
Page 20: ...20 a50 9697 Fig 21 Typical 548J 17 24 Power Wiring Diagram 208 230V 3 Phase 60Hz unit shown ...
Page 44: ...44 a50 9699 Fig 44 RTU Open System Control Wiring Diagram ...
