[
VII
Control ]
- 110 -
HWE1113B
GB
Backup control
-7- Backup control
The following backup control is started on the HBC as necessary.
(1) Backup mode for plate heat exchanger protection
The following control is performed depending on the outlet pipe temperature of the plate heat exchanger for freeze-up pro-
tection.
[Cooling-main/Heating-main operation]
1) Outdoor unit
Cooling-main operation: Continued; Heating-main operation: Continued
2) HBC controller
(2) Heating water temperature backup mode
When the heating operation can be continued without receiving heat from the refrigerant due to water temperature rise during
heating operation (the outlet pipe temperature of the plate heat exchanger is 50ºC or above), the outdoor unit goes into the
Thermo-OFF mode, and the heating operation is performed only by circulating the hot water by the water pump. When the
water temperature decreases to a certain level (the outlet temperature of the plate heat exchanger is 45ºC or below), the out-
door unit starts up.
Water pump protection control
-8- Water pump protection control
When the circuit is clogged or air enters the water circuit, the protection control starts on the HBC controller to protect the
water pump and the system is stopped depending on the situation.
(1) When the internal temperature of the water pump increases
When the detection temperature of the water pump outlet pipe is above a certain level, the water pump is stopped to protect
it from the heat.
(2) When the revolutions of the water pump increases
When the revolutions of the water pump is above a certain level (The value changes depending on the specified voltage.),
the water pump is stopped to reduce the risk of air infiltration and water leaks.
Control mode
Cooling-main/Heating-main
Cooling-only
Outdoor unit
Operation
mode
Continues the current operation
Cooling-only Thermo-OFF
HBC controller
21S4Ma
Heating side: open (de-energized)
Cooling side: open (energized)
21S4Mb
Cooling side: open (de-energized)
Cooling side: open (de-energized)
LEV1
Maintains the opening that was used in the
previous operation mode
Opening during Cooling-only Thermo-OFF
LEV2
41 pulses: fully closed
Opening during Cooling-only Thermo-OFF
LEV3
3000 pulses: fully open
Opening during Cooling-only Thermo-OFF
SVM1
Closed
Open
PUMP1
Continues the heating operation
Continues the cooling-only operation
PUMP2
Continues the cooling operation
Continues the cooling-only operation
MV1a~h,
MV2a~h
Opening during Cooling-main/Heating-main
Opening during Cooling-only
FCV3a~h
The opening depending on the indoor unit
operation mode
The opening depending on the indoor unit
operation mode
Summary of Contents for City Multi CMB-WP108V-G
Page 1: ...AIR CONDITIONER 2014 Service Handbook PURY WP200 WP250YJM A CMB WP108V G Model 3rd edition ...
Page 11: ... 2 HWE1113B GB ...
Page 27: ... I Read Before Servicing 18 HWE1113B GB ...
Page 29: ... 20 HWE1113B GB ...
Page 57: ... 48 HWE1113B GB ...
Page 70: ... III Outdoor Unit Components 61 HWE1113B GB 2 Power supply circuit board ...
Page 71: ... III Outdoor Unit Components 62 HWE1113B GB ...
Page 73: ... 64 HWE1113B GB ...
Page 81: ... IV Remote Controller 72 HWE1113B GB ...
Page 83: ... 74 HWE1113B GB ...
Page 89: ... 80 HWE1113B GB ...
Page 97: ... 88 HWE1113B GB ...
Page 127: ... 118 HWE1113B GB ...
Page 135: ... VIII Test Run Mode 126 HWE1113B GB ...
Page 137: ... 128 HWE1113B GB ...
Page 253: ... 244 HWE1113B GB ...