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6.5 Emergency operation
6.5.1 Emergency operation of controller
In case of the controller malfunction, emergency operation can be executed by using emergency
operation kit.
(1) Components to be prepared (emergency operation kit)
Short-circuit connector ... Installed in front of the controller inside the control box
Emergency magnet ... (Part No. 1896110)
(2) On-site work
The following works are required for emergency operation.
q
Wiring change for short circuit operation
1) Wiring change for cutting off the power to CPU board
2) Wiring change for making the forced running of Compressor, Condenser Fan and Evaporator
Fans.
* Install the short-circuit connector in front of the controller.
* For the details, refer to the clause 6.5.2 "Short Circuit Operation"
w
Opening adjustment of electronic expansion valve
* The emergency magnet is used to adjust the opening.
* For the details, refer to the clause 6.5.3 "Opening Adjustment"
e
Suction Modulation Valve opening adjustment for full opening.
* Use Emergency Magnet for full the opening.
* For details, refer to "Adjustment in fully open condition" in section 6.5.4.
(3) Operating condition at emergency
Temperature can not be controlled. Turn the circuit breaker on or off to maintain the target
temperature.
Mode
Available function of
protection devices
Operating condition of unit
Cooling operation
RPP : Reverse phase protection
device
HPS : High pressure switch
CTP : Compressor thermal protector
Compressor runs continuously.
Evaporator fan runs at low speed
continuously.
Condenser fan runs continuously.
Electronic expansion valve
operates with fixed opening.
Suction modulating valve operates
with full opening.
Heat operation
–––––––––––––
Compressor stops.
Evaporator fan runs at high speed
continuously.
Condenser fan stops.
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