Function and Control

Frequency

ON

Compressor

OFF

ON

Four way valve

OFF

ON

Fan

OFF

Electronic expansion valve opening

0Hz

60sec.

50sec.

 

600sec.

5sec.

 

 

 

 

 

 

 

450pps

350pps

 

 

 

 

 

 

 

 

 

PI control

50sec.

5sec.

450pps

Initial opening

6.12 Fan Control

Outline

Fan control is carried out according to the following priority.

1.Fan ON control for electric component cooling fan

2.Fan control when defrosting

3.Fan OFF delay when stopped

4.ON/OFF control in cooling operation

5.Tap control when drooping function is working

6.Fan control in forced operation

7.Fan control in indoor/outdoor unit silent operation

8.Fan control in powerful mode

9.Fan control in normal operation

Detail

Fan OFF Control when Stopped

*Fan OFF delay for 60 seconds must be made when the compressor is stopped.

Tap Control in indoor/outdoor unit silent operation

1. When Cooling Operation

When the outdoor air temperature is lower than 99°F, the fan tap must be set to L.

2. When Heating Operation

When the outdoor air temperature is higher than 39°F, the fan tap must be turned to L (only for heat pump model).

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Friedrich MR12C1H, MW12C1H, MW09C1H, MR09C1H manual Fan Control, Tap Control in indoor/outdoor unit silent operation