Special Function - Mitsubishi Electric EHST20C-VM6HB Service Manual

*1 Manual defrost should be done as follows.

1Change the DIP SW1-1 on the outdoor controller board from OFF to ON.

2Manual defrost will start by the above operation 1 if all these conditions written below are satisfied.

• Heat mode setting

• 10 minutes have passed since compressor started operating or previous compulsory defrosting finished.

• Pipe temperature is less than or equal to 8:.

Manual defrost will finish if certain conditions are satisfied.

Manual defrost can be done if above conditions are satisfied when DIP SW1-1 is changed from OFF to ON.

After DIP SW1-1 is changed from OFF to ON, there is no problem if DIP SW1-1 is left ON or changed to OFF again. This depends on the service conditions.

*2 'Power failure automatic recovery' can be set by either remote controller or this DIP SW. If one of them is set to ON,

'Auto recovery' activates. Please set "Auto recovery" basically by remote controller because all units do not have DIP SW.

Please refer to the indoor unit installation manual.

*3

SW7-1,2 are used for demand control. SW7-1,2 are effective only at the demand control.

(Refer to the next page : Special function (b))

*4

Please do not use SW7-3~6 usually. Trouble might be caused by the usage condition.

(a) Low-level sound priority mode (Local wiring) only for air-conditioners

Unit enters into Low-level sound priority mode by external signal input setting.

Inputting external signals to the outdoor unit decreases the outdoor unit operation sound 3 to 4 dB lower than that of usual.

Adding a commercial timer or on-off switch contactor setting to the CNDM connector which is optional contactor for demand

input located on the outdoor controller board enables to control compressor operation frequency.

Note: The performance depends on the load of conditioned outdoor temperature.

How to wire

Insulate this point securely as

this is not used.

Purchased locally

Relay

supply

~

SW1

X

SW1 : Switch

X : Relay (Contact spec. : DC1mA)

1) Make the circuit as shown above with Adaptor for external signal input (PAC-SC36NA).

2) Turn SW1 to on for Low-level sound priority mode.

Turn SW1 to off to release Low-level sound priority mode and normal operation.

OCH533D

Adaptor for external

signal input

(PAC-SC36NA)

X

Max. 10 m including local wiring

Outdoor unit

controller board

Red 3

Brown 2

Orange 1

CNDM

62

3

2

1