12
Reversing Valve and Check Valve Position
See Fig. 15 on page 11.
Table 3 – 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
Table 4 – Heating Mode (each circuit)
Component Status/Position
Reversing Valve De-energized
Check Valve A Open
Check Valve B Closed
Check Valve C Open
Check Valve D Closed
Table 5 – Defrost Mode
A04-A07 and D08-D14/Circuit 2:
Component Status/Position
Defrost Thermostat Closed
Outdoor Fan(s) Off
Reversing Valve Energized
Check Valve A Closed
Check Valve B Open
Check Valve C Closed
Check Valve D Open
Troubleshooting Refrigerant Pressure
Problems and Check Valves
Refer to Fig. 15, above, and the Cooling Mode and
Heating Mode tables (Tables 3 and 4) above.
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 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. 16. 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.
o
o
C08453
Fig. 16 − CoreMax Access Port Assembly
PURON
R
(R−410A) REFRIGERANT
This unit is designed for use with Puron (R−410A)
refrigerant. Do not use any other refrigerant in this
system.
Puron (R−410A) refrigerant is provided in pink (rose)
colored cylinders. These cylinders are available with and
without dip tubes; cylinders with dip tubes will have a
label indicating this feature. For a cylinder with a dip
tube, place the cylinder in the upright position (access
valve at the top) when removing liquid refrigerant for
charging. For a cylinder without a dip tube, invert the
cylinder (access valve on the bottom) when removing
liquid refrigerant.
Because Puron (R−410A) refrigerant is a blend, it is
strongly recommended that refrigerant always be removed
from the cylinder as a liquid. Add liquid refrigerant into
the system in the discharge line. If adding refrigerant into
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