High Temperature Or Protection Of Pressure Diagnosis And Solution - York YEFE BZTM-MOW1 Series Service Manual

5.11 High temperature or protection of pressure diagnosis and solution

Description: The High pressure switch detects a ultra high pressure or the Low pressure switch detects a ultra low
switch, which could damage the system.
Recommended parts to prepare:
• Bad wiring of the pressure switches
• Faulty pressure switches
• Refrigeration system is over load or blocked or lack of refrigerant
Troubleshooting and repair:
H i gh tem perature or protecti on
H i gh tem perature or protecti on
Possi bl e reason
Possi bl e reason
1. The w i res i s l oose to K 1
1. The w i res i s l oose to K 1
2. A i r or other gas i n the refri gerant.
2. A i r or other gas i n the refri gerant.
3. H eat exchanger i s di rty
3. H eat exchanger i s di rty
4. O utdoor fan or fan bl ade i s defecti ve
4. O utdoor fan or fan bl ade i s defecti ve
5. O utdoor uni t i s i n bad venti l ati on
5. O utdoor uni t i s i n bad venti l ati on
6. Refri gerant i s l eakage
6. Refri gerant i s l eakage
of pressure
of pressure
I s i t k1 or K 2 open ?
I s i t k1 or K 2 open ?
I s t em per at ur e
I s t em per at ur e
pr ot ect i ve sw i t ch K1
pr ot ect i ve sw i t ch K1
open
open
Y ES
I s pressure protecti ve
I s pressure protecti ve
sw i t ch K2 open
sw i t ch K2 open
Y ES
Possi bl e reason
Possi bl e reason
1. The w i res i s l oose to K 2
1. The w i res i s l oose to K 2
2. A i r or other gas i n the refri gerant.
2. A i r or other gas i n the refri gerant.
3. H eat exchanger i s di rty
3. H eat exchanger i s di rty
4. O utdoor m otor or fan bl ade i s defecti ve
4. O utdoor m otor or fan bl ade i s defecti ve
5. O utdoor uni t i s i n bad venti l ati on
5. O utdoor uni t i s i n bad venti l ati on
6. Refri gerant i s too m uch
6. Refri gerant i s too m uch
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