Johnson Controls YVAHP0721CW Series, Service Manual

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4-24
SM-16007
MAINTENANCE
TURN OFF all power source switches.
4.1.13 Replacing Refrigerant Oil
4.1.13.1 Replacing Refrigerant Oil (No Blockage in Return Oil Circuit)
(1) Remove the front service cover according to Section 4.1.1 “Removing Front Service Cover”.
(2) Close (A) high/low pressure gas stop valve and (B) liquid stop valve.
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access port. Ensure that the pressure does not increase at this time.
NOTE:
If the pressure increases, recover all the refrigerant in the system.
(4) Connect the charge hose (for R410A) to (C) access port for recovering refrigerant oil.
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in the accumulator by applying pressure. (approx. 20 minutes)
NOTE:
Ensure that the pressure for (E) high pressure access port is NOT abnormal when nitrogen is charged.
(6) Stop charging nitrogen after refrigerant oil has been completely recovered.
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refrigerant oil.
NOTE:
When the collected refrigerant oil is 0.79 gal. (3L) or less, a blockage may exist in the return oil circuit.
In that case, replace the return oil circuit according to Section 4.1.13.2 “Replacing Refrigerant Oil
(Blockage in Return Oil Circuit) and Replacing Return Oil Circuit”.
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access port and recharge the refrigerant. After recharging, open the stop valves.
NOTE:
1. Use a clean charging hose.
2. Charge the refrigerant oil in a short amount of time (within approximately 20 minutes).
Use a container with a small opening so that the refrigerant oil does not absorb the moisture from
the atmosphere.
Tool Adjustable Wrench
(E) High Pressure Access Port
(D) Low Pressure Access Port
(B) Liquid Stop Valve
(A) Gas Stop Valve
(C) Access Port for
Collecting Refrigerant Oil