York DHM42CMB21S Service Manual page 76

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Steps
2. Disconnect the 4-way valve and the connected pipe by soldering.
Take down the faulty 4-way valve.
Disconnect the 4-way valve and the connected pipe
with a welding gun. Take down the faulty 4-way
valve.
3. Replace the 4-way valve and reconnect it with the pipeline.
① Place the new 4-way valve in the right place.
② Re-weld the new 4-way valve with the pipeline.
4. Install the 4-way valve coil
① Set the 4-way valve coil securely.
② Tighten the screws with a screwdriver.
Procedure
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