Recovering Refrigerant - Sanyo CHDXR09663* Service Manual

5. Recovering Refrigerant

The following equipment and tools are required:
Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410A
only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and
outdoor unit maintenance remote controller.
5-1. Refrigerant Recovery Procedures (from outdoor unit)
(1) Turn off the power of the outdoor unit beforehand (at power mains).
(2) Fully close each service valve on the liquid tube, gas tubes, and the balance tube of the outdoor unit.
(3) Connect the outdoor unit's high-pressure and low-pressure outlet ports with the Hi and Lo sides of the manifold
gauge valves using hoses. (Fig. 9)
CAUTION
(4) Connect the manifold gauge valves, refrigerant recovery unit, and recovery cylinder using hoses. To avoid the
entry of air into the refrigerant tubing, carry out this connection work carefully. (Fig. 9)
CAUTION
(5) Locate the AP (Air Purge) pins on the control PCB in the faulty outdoor unit and short them using the clips of
the jumper wire. Then restore electrical power to the outdoor unit.
CAUTION
(6) Carry out refrigerant recovery.
CAUTION
Refrigerant
recovery unit
Refrigerant recovery cylinder
The remaining refrigerant in the faulty outdoor unit may create internal pressure.
Before connecting hoses, be sure to confirm that each of the manifold gauge
valves is tightly closed. Note that the connection ports employ Schrader-type
push-to-release valves.
For detailed procedures such as connecting the refrigerant recovery unit with the
recovery cylinder and methods used for recovery, follow the specific instructions
that came with the refrigerant recovery unit.
By short-circuiting the AP pins, each solenoid valve in the outdoor unit is forcibly
opened as soon as power comes on, which releases all remaining refrigerant into
the recovery cylinder. Since neglecting this procedure may leave some refrigerant
in the system, it is important that you carry out this step.
To determine the completion of refrigerant recovery, follow the instructions that
came with the refrigerant recovery unit.
Manifold
gauge
Lo Hi
High-pressure outlet
port (For 5/16" (7.94mm)
-dia. connector)
Low-pressure outlet port
(For 5/16" (7.94mm)-dia. connector)
Fig. 9
2 - 9
W-2WAY ECO-i SYSTEM
Outdoor Unit Repair Procedures
2