Heiko JZ050-C1, Service Manual

Page: 19 / 65

Functions and control
17
Domestic air conditioner
After outdoor unit is off, the EEV opening keep the current on for 5 s, then open the EEV completely for
2 minutes, then become 120 steps (cooling) or 60 steps (heating).
The EEV opening will increase if SH (superheat degree) >0 while decrease if SH<0.
Adjust frequency:
If |SH|=0, 60s/ 1 step
If |SH|
≥
3,and
△
SH=0, 10s/ 1 step.
If 3
≥
|SH|
≥
0, 30s/ 1 step.
△
SH= current SH- last SH
SH= Ts (suction temp)-Tc1 (indoor coil temp)-Tsh (fixed data, depend on different models, -1~2)
7.1.4 Four way control
For the details of defrosting four-way valve control, see the defrosting process.
Four way working in other ways:
Under the mode of heating, open the four-way valve, when the compressor is not started or changed to
non-heating mode, make sure the compressor is stoped for 2 minutes, and then close the four-way valve.
7.1.5 Protection function
7.1.5.1 TTC high temperature-preventing protection
Once the machine is started, it can run TTC(air-blowing temp) overheating protection of air-blowing,
but air-blowing sensor malfunction must alarm after 4 minutes during which the compressor is started
(during the course of self-detection, there’s no such limitation)
Sensor detection methods: 100 times (one cycle of procedure run is one time, and about 5ms,
detection method for eac
●
h time: continuously sampling for 8 times, then order them and take the mean
value of the middle
●
2 values), take the mean value.
TTC
（℃）
09K
（
●
12K
）
Abnormal stop
110
（
110
）
Decreasing the frequency rapidly
（
1HZ/second
）
107(106)
Decreasing the frequency slowly (1HZ/10seconds)
105(104)
The frequency doesn’t change.
102(102)
Increasing the frequency (1HZ/10second)
95(93)
Increasing the frequency
（
1HZ/1second
）
TTC>=110
℃
●
lasts for 20 seconds. Overheating protection of air-blowing, alarm malfunction to the
indoor, others don’t last.
●
7.1.5.2 TC high temperature-preventing control of the indoor heating unit
：
Tpg_indoor is the highest value of the effective indoor unit (start it and it is in accord with the running