21
6)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
Communication Fault
If the unit fails to receive correct signals for a 3 minutes, communication fault will occur and the whole system will stop
and a “E6” will be displayed on the front panel of the indoor unit.
Module Protection
Under module protection mode, the compressor will stop. When the compressor remains o for 3 minutes, the compres-
sor will resume operation. If the module protection occurs six time in succession, the compressor will remain o . is is a
thermal protection for the indoor module (AP1).
Compressor Protection
e compressor contains a thermal overload switch tom protect it from abnormal conditions.
If temperature sensed by the overload sensor is over 239 F, the compressor will stop and the outdoor fan will stop a er 30
seconds. When the temperature is below 203 F, the overload protection will reset to normal state.
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.
System Operation 9,000/12,000 btuh Models, cont.
Basic Functions
Product Introduction
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