8
C
D
A
B
C11247
LOCATION
DIMENSION
CONDITION
A
48---in. (1219 mm)
18---in. (457 mm)
18---in. (457) mm
12---in. (305 mm)
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
B
42---in. (1067 mm)
36---in. (914 mm)
Special
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
C
36---in. (914 mm)
18---in. (457 mm)
Side condensate drain is used
Minimum clearance
D
42---in. (1067 mm)
36---in. (914 mm)
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non---conductive (e.g., wood, fiberglass)
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 check a valve and a strainer. Size 07 units
have a single compressor--circuit; unit sizes 08 through 09
have two compressor--circuits. See Fig. 5 for typical unit
piping schematic (unit size 09 (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 9) and Tables 1, 2, and 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
--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. 6 on page 9. 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
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 549J Series
Page 4: ...4 C160144 Fig 2 Unit Dimensional Drawing 07 08 Size Units ...
Page 5: ...5 C160145 Fig 2 Unit Dimensional Drawing 07 08 Size Units cont ...
Page 6: ...6 C10757A Fig 3 Unit Dimensional Drawing 09 Size Units ...
Page 7: ...7 C10758A Fig 3 Unit Dimensional Drawing 09 Size Unit cont ...
Page 40: ...40 a549J 001 Fig 44 Typical RTU Open Controller Wiring Diagram ...
