York DHW36CMB21S, Service Manual

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Service Manual
6. Function and Control
1.Function Control
1) Cooling mode
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needs or calls the cooling operation condition, the system
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corresponding electronic expansion valve will be closed.
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d. 4-way valve
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energizes
e. Outdoor fan control in cooling mode
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set speed.
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3) Heating mode
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heating
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.
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s
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demand.
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.
e. Defrosting function
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de-energizes
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an extended time, the system will run an oil-return operation in high frequency ;
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4) Fan mode
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the
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(will be off),
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de-energized.
2.Protection Function
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(different modes of operation)
When one indoor unit is calling for cooling and another indoor unit is calling for heat
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the
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2) Overload protection
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