Part 2 Functions & Controls

5.13 Oil return control(30kBtu/h Model) Heatpump Only

5.13.1 Operating Contion

1)When the continuous running time is over 3hr.(option), oil returning operation is run for 3min. In case of the initial operation, oil returning operation is run, after completing initial operation.

2)After defrost and oil returning operation, the continuous running time is reset.

5.13.2 Operation Process

1)EEV-Full open, Hot gas bypass valve-On

2)Compressor Step-70Hz + Constant Comp. On(Option)

3)Reversing valve-Off(Process of Off/On, follows defrost operating.)

4)Outdoor Fan-Low step

5.14 Oil equalizing control(30kBtu/h Model)

Operating condition :

1)When the continuous inverter compressor running time at under 40 Hz(option) is over 2 hours(option) in 2 com- pressor system, oil restoring operation begins.

2)If compressor operating Hz is below 40 Hz by the safety control, the accumulated time will be cleared and oil restoration does not begin.

3)During this operation,if operating Hz can not be changed by safety control, the oil equalization operation will cease.

Operating process : Raise the operating HZ up to 70,and after 20 sec.(option) recover to the last value.

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Only for training and service purposes

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Heat Controller VMC12SB-1/VMH12SB-1 Oil return control30kBtu/h Model Heatpump Only, Oil equalizing control30kBtu/h Model
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