HAIER CHILLER
30
Fig. 14-1 Compreesor running diagram in cooling mode
13.1.5 Cooling (heating) water pump running regulation
Cooling (heating) water pump will startup when PCB working or protection in winter, the working of pump
is concerned with the state of water flow switch.
a. The water pump PCB detect water flow switch continually after the pump working for 10 seconds. If
water flow switch OFF, enter normal running state.
b. When pump has started for 10 seconds or during working, if the water flow switch of master module
keep opening for [EC07], all equipments of systerm will stop, [UNIT] will flash and display failure code
[Eo:04]. if the water flow switch of slave module keep opening for [EC07], all equipments of this module will
stop, the corresponding module No. will flash and display failure code [Eo:07].
13.1.6 Protection during cooling state
PCB will dectect the possible failure when working and manage accordingly under cooling mode.
a. Anti-freeze protection (failure code [Pr:07])
Start conditions for anti-freeze protection:
①
Compressor works;
②
Water outlet temp. T
ou
<[EP01] and keeps for 1 minute
.
When enter anti-freeze protection, the corresponding module No. will flash and display failure code
[Pr:07] on MCU, all compressors in the corresponding module will stop for protection.
Quit conditions for anti-freeze protection:
①
Water outlet temp. T
ou
≥
[EP01]+3
℃
, failure disappear;
②
Resume cooling after compressor meet the stop time of protection.
b. Temp. sensor failure protection
①
When the system total return temp. sensor damage, the system [UNIT] will flash and display [Eo:01]
code, system will stop for protection;
②
When the system total outlet temp. sensor damage, the system [UNIT] will flash and display [Eo:02]
code, module will stop for protection;
③
When the module total outlet temp. sensor damage, the corresponding module No. will flash and
OFF
ON
Compressor
state
T
s
-[SP01]
T
s
T
s
+[SP01]
T
tr/o
Upload
area
Standby
area
Download
area
Emergency
stop area
