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Only for training and service purposes
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).
COMP
Step
ON
Discharge pipe temp.
OFF
ON
Expansion
valve
10
Pulse
Up
On time
control
On-time
control
Stop
Toff(105)°C(221)°F
T1(90)°C(194)°F
T2(95)°C(203)°F