Johnson Controls YVAHP072B31S, Service Manual

Page: 1493 / 1796

Service Manual
4-33
MAINTENANCE
4.1.13.5 Removing Reversing Valve
(1) Remove the front service cover according to Section 4.1.1 “Removing Front Service Cover”.
(2) Remove the electrical box, wirings and electrical box support according to Section 4.1.5 “Removing
Electrical Box.”
(3) Before starting this work, recover the refrigerant into a recovery cylinder from the system, and turn
OFF the power source of the unit.
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(5) Disconnect the wiring for the reversing valve coil.
(6) Remove the reversing valve coils according to Section 4.1.13.4 “Removing Reversing Valve Coil”.
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NOTE:
1.
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2. In an instance of (H,Y)VAHP072 - 120B(3,4)1S (Heat Pump System),
connect the charging hose to the access port for the low pressure gas stop valve before unbrazing.
(8) Remove the reversing valve assembly.
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Unbraze in the following order:
(a) Brazing at right and left branch pipes of three pipes from the reversing valve.
(b) Brazing at the center branch pipe of three pipes from the reversing valve.
NOTE:
When unbrazing, cover the reversing valve with a wet cloth for cooling.
(9) For reassembly, perform the removal procedure in a reverse order.
NOTE:
When performing brazing work, cover the reversing valve with a wet cloth for cooling.
TURN OFF all power source switches.