Part 2 Functions & Controls

5.11.3 Constant Compressor (only 30kBtu/h Model)

1)There can be two situations

(a)Temperature sensor is failed (Error Code 41)

(b)Abnormal high temperature discharge temperature (error code for high discharge will be generated) Both cases unit will stop.

2)Compressor working

(a)If discharge pipe temperature < T1 Compressor ON, EEV on-time control

(b)T2 ≤ discharge pipe temperature < Toff (Hysteresis control) Expansion valve up by 10 pulses every 1 min. If EEV is in the starting control it will follow it as it is.

(c)Discharge pipe temperature ≥ Toff Compressor will be OFF

System will stop if this situation occurs 5 times in 1 hour and error code will be generated (Error Code 33).

Toff(105)°C(221)°F

Discharge pipe temp.

 

 

 

 

 

 

 

T2(95)°C(203)°F

 

 

 

 

T1(90)°C(194)°F

 

 

 

 

COMP

ON

 

OFF

ON

Step

 

Expansion

On-time

10

Stop

On time

Pulse

valve

control

Up

 

control

 

 

 

 

- 27 -

Only for training and service purposes

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Page 27
Image 27
Heat Controller VMC30SB-1/VMH30SB-1 service manual Constant Compressor only 30kBtu/h Model, There can be two situations
Page 26 Page 28

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