Johnson Controls YJHJXH018BARR-FX, Service Manual

Page: 26 / 112

Domestic Air Conditioner 24
5.2.5.1
˖
TTC high temperature-preventing protection
Once the machine is started, it can run TTC 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 each time: continuously sampling for 8 times, then order them and take the
mean value of the middle 2 values), take the mean value.
TTC ˄ć˅
Abnormal stop
115
Decreasing the frequency rapidly ˄ 1HZ/second ˅
110
Decreasing the frequency slowly (1HZ/10seconds)
105
The frequency doesn’t change.
98
Increasing the frequency (1HZ/10second)
95
Increasing the frequency
˄
1HZ/1second
˅
TTC>=115
ć
lasts for 20 seconds. Overheating protection of air-blowing, alarm malfunction to the
indoor, others don’t last.
5.2.5.2 ˖ 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
state).
The indoor heat exchanger sensor tests the temperature of the indoor heat exchanger. If the
temperature is higher than 48 ć , decrease the rotate speed of the compressor and do the high
temperature-preventing protection of the indoor heat exchanger; if the temperature of the indoor heat
exchanger is lower than 45 ć , recover to the normal control.
TC
The compressor stops
Fgh_t1
ˉ
2
Fgh_t1 63 ć
N Decreasing the frequency rapidly Fgh_t2 59
ć
Fgh_t2 ˉ 2
P Decreasing the frequency slowly Fgh_t3 56 ć
Fgh_t3 ˉ 2
Q Prohibiting increasing the frequency
Fgh_t4 53 ć
Fgh_t4—2 R Increasing slowly Fgh_t5 48 ć
Fgh_t5—2
Normal
N ˖ Decreasing at the speed of 1HZ/1 s second
P ˖ Decreasing at the speed of 1Hz/10 s seconds
Q ˖ Continue to keep the last-time instruction cycle
R
˖
Increasing at the speed of 1Hz/10seconds
Remarks: the outdoor unit
5.2.5.3 The control of preventing the overcurrent of the compressor
˖
Funcitions and Control
YJHJZH018BARRAFX －ＳＭ