HAIER CHILLER
5
2.5 Electric control
Adopt the PCB to control the operation.
The unit can realize remote operation
.
The control of water temperature will act according to the water outlet temperature.
The unit can realize compulsorily unit quantity control and compulsorily capacity control for the unit with
several compressors.
When failure occurs, the normal compressor can continue running (for the unit with several compressors).
When abnormal, the unit can monitor the current water temperature, operation time.
In operation, the unit can monitor the water temperature, capacity state, and operation time.
On the crystal touch screen, you can control the unit.
When abnormal, the failure information will display on the crystal touch screen automatically.
The unit can realize the interlock
between the cooling
.
Note: Do not damage the power cable.
The following items can be tested if abnormal: high pressure, low pressure, compressor motor coil
temperature, compressor discharging temperature, anti-freeze, reverse power supply, etc.
2.6 Safety Device
For the requirement of safety, there is solenoid valve on the discharging pipe to discharge the gas when the
pressure is too high. Must not install any stop valve on the pipe with safety relief valve.
The unit is equipped with safety device to confirm the safe operation. When one safety device acts, the
failure indicator will light, and the corresponding function will stop, while the other function is normal.
Suggestion: Once one section occurs abnormal phenomenon, you should shut off the unit to check
the reason to avoid the worse damage.
safety device
Protection point
Set value
Action reasons
Delay time when
shut off
The interval time between
compressor stops and restart up
15minutes Compressor
startup/stop frequently
Refrigerant charged too much
Ambient temperature too high
Condenser blocked, bad ventilation
High pressure
sensor
Discharging pressure protection
2.4Mpa
Non-condensing gas in system
Chilled water temperature too low
Water temperature
sensor
Anti-freezed protection for chilled
water
5
℃
Set temperature too low
Because of leakage, refrigerant too little
Solenoid valve of compressor heat exchanging pipe
shut off because of failure
Discharging
temperature
sensor
Discharging temperature
protection
in
：
100
±
2.5
℃
out
：
89
±
2.5
℃
Stop valve on condenser outlet shutoff
Motor overheat
protection
Compressor motor protection
in
：
105
±
5
℃
out
：
88
±
11
℃
Identical with high pressure switch (high
pressure protection)
Expansion valve shutoff because of failure
Stop valve on condenser outlet shutoff
Chilled water flow too low
Low pressure
sensor
Suction pressure protection
0.35Mpa (cooling)
0.1Mpa (heating)
Evaporator blocked
Reverse phase
protection
Compressor motor reverse protection
Phase sequence
correct
Power wiring incorrect
Over current relay
Compressor motor over current
protection
According to the
compressor
Motor over current
/
master
cold water pump and the
and remote control
unit
and passive element starup/stop control
