HAIER CHILLER
3
3
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
display [Er:08] code, the corresponding module will stop for protection;
④
When the outdoor ambient temp. sensor damage, the system [UNIT] will flash and display [Po:01]
code, cancel the enter condition of system defrost by outdoor ambient temp. sensor, system will enter
defrost by judging the coil temp. senor of condenser;
⑤
When condenser the coil temp. sensor of No.1 module damage, the corresponding module No. will
flash and display [Pr:01] code, cancel the enter condition of corresponding module defrost by outdoor
ambient temp. sensor, enter defrost as other modules;
⑥
When the condenser coil temp. sensor of No.2 module damage, the corresponding module No. will
flash and display [Pr:02] code, cancel the enter condition of corresponding module defrost by outdoor
ambient temp. sensor, enter defrost as other modules;
⑦
When the condenser coil temp. sensor of No.3 module damage, the corresponding module No. will
flash and display [Pr:03] code, cancel the enter condition of corresponding module defrost by outdoor
ambient temp. sensor, enter defrost as other modules.
Note: If all the condenser coil temp. sensors damage, defrost in timer defrost mode.
d. Anti-freeze protection in winter (failure code [Pr:06])
It is needed to use anti-freeze protection in winter to prevent heating or cooling water from freezing when
unit stops during winter, Start conditions for anti-freeze protection:
①
The unit stops;
②
When the system water total return temp. T
tr
or system water total outlet temp. T
tou
≤
[EP07] +3
℃
,
enter anti-freeze protection, cooling (heating) water pump start, run for 5 minutes and then stop for 30
minutes. When T
tou
≤
[EP07], compressor enter heating mode, auxiliary electric heating will working.
When enter anti-freeze protection, system [UNIT] will flash and display failure code [Po:06] on MCU, quit
the protection when the following conditions are meeted:
①
Air conditioner startup;
②
When the system water total return temp. T
tr
and system water total outlet temp. T
tou
≥
[EP07] +6
℃
,
quit anti-freeze protection;
③
water flow abnormal.
13.3 Defrost opertion
13.3.1 Start conditions for defrost
a. Compressor accumulative running time
The influence of outdoor ambient temp. can be selected to be considered or not when accumulate the
running time according to [PC04] and [HF01] parameters.
