15
O&I manual
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1. Faults
When the main unit suffers faults, the main unit stops operating, and all other units also stop running;
When the subordinate unit suffers faults, only the unit stops operating, and other units are not affected.
2. Protection
When the main unit is under protection, only the unit stops operating, and other units keep running;
When the subordinate unit is under protection, only the unit stops operating, and other units are not affected.
CAUTION
Detail information
No.
PUMP.
Attention: the control port value of the pump actually detected is ON/OFF but not 220-230V control power
supply, so special attention should be paid when installing the pump.
1) After receiving start-up instruction, the pump will be started up instantly, and will maintain start-up state
always in the process of operation.
2) In case of refrigerating or heating shutdown, the pump will be shut down 2 minutes after all modules stop
operating.
3) In case of shutdown under the pump mode, the pump can be directly shut down.
Input of transformer, 220-230V AC current. (only valid for the main unit)
Auxiliary electric heater
Attention: the control port value of auxiliary electric heater actually detected is ON/OFF but not 220-230V control
power supply, so special attention should be paid when installing the auxiliary electric heater.
Attention!
Under heating mode, when the main unit board detects total water outlet temperature to be lower than 45
ć
, the
switch will be closed, and the auxiliary electric heater will begin to work; when the total water outlet temperature
is higher than 50
ć
, the switch will be opened, and the auxiliary electric heater will stop working.
Compressor of the system B;
Phase B of power;
Four-way valve of the system B;
Phase B of power.
Numerical code tube.
1) In case of stand-by, the address of the module is displayed;
2) In case of normal operation, 10. is displayed (10 is followed by dot).
3) In case of fault or protection, fault code or protection code is displayed.
Compressor of the system A;
Phase B of power;
Four-way valve of the system A;
Phase B of power.
Outdoor fan A, controlled by T4;
Phase B of power;
Outdoor fan B, controlled by T4;
Phase B of power;
(reserved port)
(reserved port)
Input of three-phase four-wire power supply (fault code E1)
Three phases A, B and C of power supply should exist simultaneously, and the difference of phase angle
should be 120º among them. If the conditions are not met, fault of phase sequence or phase lack may occur,
and fault code will be displayed. When the power supply returns to normal condition, fault is removed.
Attention: phase lace and phase dislocation of power supply are detected only in the early period after the
power supply is connected, and they are not detected while the unit is in operation.
Output of transformer
Summary of Contents for ICHS-420KC-5
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