ADVANCED SCROLL TEMPERATURE PROTECTION (ASTP)
FLEXYII_WSHP-IOM-0909-E Page 100
O
PERATION MODE EXPLANATION
Protection is activated when Scroll Discharge Port.
Reaches 150°C
(+/- 17K)
Compressor is protected as « Unloaded » but
continues to run
• Protection mode balances discharge/suction
pressure
- Motor heat builds inside compressor
- No refrigerant flow to carry motor heat away
Motor protector opens (Klyxon)
• Compressor turns off, cools
Motor protector resets, compressor restarts
• Bi-metal disk resets before motor protection
• Cycle will continue until cause of overheat is fixed
S
ERVICE A COMPRESSOR
What to do?
• If a protected compressor is identified
- Stop the compressor
- Allow to cool thoroughly
- Restart pump & check for normal operation
DO NOT ASSUME A COMPRESSOR RUNNING
UNLOADED (BALANCE PRESSURE) IS A FAILURE
Likely situations where protection may activate :
• Initial system charging (or recharging after servicing)
- Compressor is run with too little system charge
Very common on split system
Will result in very low suction pressures (<1.7
Bars)
Do not disable low pressure cutouts while
charging
Charge high-side with liquid first
• Field servicing (system problem causes overheating)
- Technician will observe « Balanced pressures »
- Risk of misdiagnosis as failed compressor
- Must stop pump, cool thoroughly, reset
Temperature Behavior with ASTP Protection
40
65
90
120
150
180
0 20 40 60 80 100 120 140 160
Time (Minutes)
Temperature (°C)
DISC OPENS,
SCROLLS UNLOAD
Compressor Runs
Balanced
Pressures
PROTECTOR RESETS,
PUMP RESTARTS FULLY
LOADED
MOTOR PROTECTOR
OPENS, PUMP TURNS
OFF
Discharge
Port
Kl
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