Gree MULTI18HP230V1A - Page 33

33
Common Protection Functions and Fault Displays
Coil High Temperature Protection
T
tube
= measured temperature of outdoor coil in cooling mode, measured temperature of indoor coil in heating mode.
1) Outdoor Coil High Temperature Protection - In cooling mode the soware will monitor the outdoor coil for an abnor-
mal high temperature condition.
A. If T
tube
<= 126 F, the unit will return to its original operation state
B. If T
tube
>= 131 F, frequency rise is not allowed
C. If T
tube
>= 136 F, the compressor will run at reduced frequency
D. If T
tube
>= 144 F, the compressor will stop and the indoor fan will operate at preset speed
2) Indoor Coil Temperature Protection - In heating mode the soware will monitor the indoor coil for an abnormal high
temperature condition.
A. If T
tube
<= 122 F, the unit will return to its original operation state
B. If T
tube
>= 127 F, frequency rise is not allowed
C. If T
tube
>= 133 F, the compressor will run at reduced frequency
D. If T
tube
>= 140 F, the compressor will stop and the indoor fan will blow residual heat and then stop
3) Compressor Discharge Temperature Protection
e soware will monitor the compressor discharge for an abnormal high temperature condition.
A. If T
tube
>= 208 F, frequency rise is not allowed
B. If T
tube
>= 217 F, the compressor will run at reduced frequency
C. If T
tube
>= 230 F, the compressor will stop
D. If T
tube
<= 194 F and the compressor has been off for at least 3 minutes, the compressor will resume operation
4) Compressor High Pressure Protection
When the high pressure switch is detected for 6 seconds or more, the compressor will stop and can only be started by
powering o the unit. Dirty coils, refrigerant overcharge and outdoor fan problems can cause this fault.
5) Compressor Phase-lacking Protection
If one of the compressor phases are detected open before startup, the compressor will enter phase-locking protection.
e malfunction will be cleared aer 1 min, then the unit will try a restart. If an error has been detected for 6 times
continuously, the compressor will lock out and will need to have power cycled. e errors will be cleared aer the
compressor has run for 7 minutes continuously.
6) Module Protection (IPM)
Under module protection mode, the compressor will stop. When the compressor remains o for 3 minutes, the compressor
will resume operation. If the module protection occurs six time in succession, the compressor will remain o. Power will
need to be cycled to start unit. is is a thermal protection for the indoor module.
7) DC Buss Voltage Protection
e soware will monitor the DC bus voltage.
If voltage on the DC Bus is below 150 or over 420v, the compressor will stop and the outdoor fan will stop in 30 seconds.
When the voltage on the DC bus returns to normal and the compressor has been o for 3 minutes, the compressor will
resume its operation.
Protection Functions
Product Introduction