Lennox FLEXY II Series User Manual

IOM – FLEXY II – 1007 – E Page 85
OPERATION MODE EXPLANATION
 Protection is activ ated when Scroll Discharge
Port. Reaches 150°C
(+/- 17K)
 Compressor is protected as « Unloaded » but
continues to run
 Protection mode balances
discharge/suction pressure
- Mot or heat builds ins ide
compressor
- No refrigerant flow to carry
motor heat away
 Motor protect or opens (Klyxon)
 Compressor turns off, cools
 Motor protect or resets , c om pressor res t arts
 Bi-metal disk resets bef ore motor
protection
 Cy c le will c ontinue unt il c ause of
ov erheat is fixed
SERVICE A COMPRE SS OR
 What to do?
 If a prot ec t ed c om press or is ident if ied
- 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
sy stem c harge
 Very common on split
sy stem
 Will result in v ery low
suction pressures (<1.7
Bars)
 Do not disable low
pressure cutouts while
charging
 Charge high-side with
liquid f irst
 Field servicing (system problem causes
ov erheating)
- Tec hnic ian will obs erv e
« Balanced pressures »
- Risk of misdiagnosis as failed
compressor
- Mus t st op pum p, c ool
thoroughly , reset
A
DVANCED
S
CROLL
T
EM PERATURE
P
RO TECTIO N
(ASTP)
Temp eratu r e B eh avio r wi th ASTP Pr o tectio n
40
65
90
120
150
180
0 20 40 60 80 100 120 140 160
Time (Minutes)
Temperature (°C)
DISC OPENS,
SCROLLS UNLOAD
C
ompressor Runs
Balanced
Pres sures
PROTECTOR RESETS ,
PUMP RESTARTS FULLY
LOADED
MOTOR PROTECTOR
OPENS, PUMP TURNS
OFF
Discharge
Port
Klyxon
ASTP
Compressor
off

Lennox FLEXY II Series Specifications

General

Brand	Lennox
Model	FLEXY II Series
Category	Air Conditioner
Language	English