HAIER CHILLER
3
2
startup protect time
≥
[EC02]; When T
s
- [SP01] <T
tr/o
≤
T
s
, the compressor will keep its original state, there is
a setted difference temp. [SP01] to prevent compressor from conversing ON/OFF frequently; When
T
tr/o
>
T
s
+[SP02], PCB entering Emergency stop area.
Fig. 14-2 Compreesor running diagram in heating mode
13.2.5 Protection during heating state
PCB will dectect the possible failure when working and manage accordingly under heating mode.
a. Overheating protection (failure code [Pr:08])
Start conditions for overheating protection:
①
If water outlet temp. of module T
ou
rise, when T
ou
≥
[EP04], enter overheating protection;
②
When enter overheating protection, the corresponding module No. will flash and display failure code
[Pr:08] on MCU, compressor and outdoor fan motor will stop, cooling (heating) water pump will keep
running and will stop when T
ou
< [EP04]-4
℃
, compressor will begin heating according to the flow when the
start conditions of compressor are meeted.
b. Auxiliary electric heating procedure
Auxiliary electric heating will work when all the following conditions are meeted:
①
Auxiliary electric heating has been allowed by MCU (electric heating is defaulted as working when unit
start);
②
When select heat pump+ electric heating mode, outdoor ambient temp. T
oa
<[EP06];
③
When select heat pump+ electric heating mode, T
s
-
T
tr/o
>2
℃
.
Electric heating will stop if any condition as the following is meeted:
①
Water outlet temp. sensor damage;
②
The temp. of stop condition is meeted;
③
Overheating protection.
c. Temp. sensor failure protection
①
When the system total return temp. sensor damage, the system [UNIT] will flash and display [Eo:01]
OFF
ON
Compressor
state
Upload
area
Standby
area
Download
area
Emergency
stop area
T
s
-[SP01]
T
s
T
s
+[SP02]
T
tr/o