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6.4 Emergency operation
6.4.1 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 --- Stored on the back of CPU/IO board case in the control box.
Electronic expansion valve emergency cap --- Stored in the spare parts kit.
Suction modulating valve emergency magnet --- Stored in the spare parts kit.
(2) On-site work
The on-site work is requested as follows 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.
* Connect the short circuit connector stored on the back of controller.
* For the details, refer to the section 6.4.2 "Short Circuit Operation"
w
Electronic Expansion Valve opening adjustment for 1/4 opening.
* Use Emergency Cap for the for 1/4 opening.
* For the details, refer to the section 6.4.3 "Opening Adjustment"
e
Suction Modulation Valve opening adjustment for full opening.
* Use Emergency Magnet for full the opening.
* For the details, refer to the section 6.4.4 "Emergency operation of suction modulating valve"
(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 by the
emergency cap.
Suction modulating valve operates with
full opening by emergency magnet.
Heat operation
–––––––––––––
Compressor stops.
Evaporator fan runs at high speed
continuously.
Condenser fan stops.
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