Part 2 Functions & Controls

5.5 Automatic defrost Heatpump Only

5.5.1 9,12kBtu/h Model

•While in heating mode operation, in order to protect the evaporator pipe of the outdoor unit from freezing, the unit is reversed to the cooling cycle to defrost the evaporator pipe of the outdoor unit.

•Defrost control is available 40 minutes after the heating cycle started and the difference of the pipe tem-perature of outdoor unit reaches above option 1.

•The defrost control is available without reference to heating operation time only if the pipe temperature of outdoor unit reaches below option 2.

The mean outdoor

-10˚C(14˚F) less than

-10~-5˚C(14~23˚F) between

-5~0˚C(23~32˚F) between

0˚C(32˚F) more than

temperature

 

 

 

 

 

 

 

 

 

Option 1

>4

>5

>5

>5

 

 

 

 

 

The minimum Time of

 

Expected heating operating time

 

Heating(sec)

And Heating operating time 40 minutes

 

Option 2

-30

-30

-25

-25

 

 

 

 

 

 

Minimum Time

 

 

Main Deice time

 

 

 

 

 

Of Heating

5sec

5sec

30 sec

10 sec

1min

 

 

 

 

 

 

 

 

 

Setting

Operating

Setting Freq.

 

 

Step 5

 

 

 

Freq.

 

 

 

 

 

 

 

Freq. Of

 

 

 

 

 

 

Step 3

 

Comp

 

Min

 

Min

 

 

(Comp off

 

 

 

 

Inapplicable.)

 

 

 

 

off

 

 

 

 

 

 

 

 

 

 

Operating

Setting Freq.

15 sec

 

Step 5

 

 

 

 

Freq. Of

 

 

 

 

 

 

 

 

 

 

 

 

Step 3

 

Comp

 

 

 

 

 

 

 

(Comp off

 

Min

 

Min

 

 

 

Applicable.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Degree

off

 

300

 

off

 

 

 

of Superheat

 

 

 

 

Starting Step

 

EEV

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Open step

 

 

 

 

 

 

 

 

4-Way

ON

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

Setting

 

 

OFF

 

 

 

Setting

 

 

 

 

 

 

 

Indoor

Speed

 

 

 

 

 

 

Speed

 

 

 

 

 

 

 

 

FAN

Setting

 

 

 

 

Hi Speed

 

 

 

 

 

 

 

 

 

Indoor

Speed

 

 

 

 

 

Hot

 

 

 

 

 

 

 

Super low speed

FAN

 

 

 

 

 

 

 

 

 

OFF

 

 

Start

° low speed

 

 

 

 

 

 

Pre-Heat

 

 

 

ON

 

 

 

 

LED

OFF

 

 

 

 

 

OFF

 

 

 

 

 

 

Deice STEP

0

1

2

3

4

5

6

 

Model (kBtu/h)

 

Compressor Frequency

 

 

 

EEV

 

9

 

 

65Hz(Step 5)

 

 

 

300

 

12

 

 

80Hz(Step 5)

 

 

 

300

 

 

 

 

- 17 -

 

 

 

 

Only for training and service purposes

Page 16 Page 18
Page 17
Image 17
Heat Controller VMC30SB-1/VMH30SB-1, VMC09SB-1/VMH09SB-1, VMC18SB-1/VMH18SB-1 service manual Automatic defrost Heatpump Only
Page 16 Page 18

VMC12SB-1/VMH12SB-1, VMC18SB-1/VMH18SB-1, VMC24SB-1/VMH24SB-1, VMC09SB-1/VMH09SB-1, VMC30SB-1/VMH30SB-1 specifications

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