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Product Introduction
Basic Functions - 9K & 12K 230 volt
◆ Total current up and frequency down protection
When total current Itotal≤6A, increase frequency is allowed; when total current Itotal≥7A, increasing frequency is
prohibited; when total current Itotal≥8A, the unit operates by decreasing frequency. When total current Itotal≥9A, the
compressor stops operation, and indoor fan will stop operation after 30s.
(4) Fan Mode
Under the mode, the indoor fan will run at preset speed and the compressor, the outdoor fan, the four-way valve and
the electric heater will stop. Under the mode, temperature can be set within a range of 61 - 86°F.
(5) AUTO Mode
1. Working conditions and process of AUTO mode
a. When T ambient ≥78.8°F, the unit will operate in Cool mode. The set temperature is 77°F.
b. When T ambient ≤71.6°F, the heat pump unit will operate in Heat mode., set temperature be 68°F; the cooling only
unit will operate in Fan mode, set temperature be 77°F.
c. When 73.4°F≤T ambient ≤77°F, the unit will operate in the previous state. If it is energized for the first time, it will
operate in Fan mode.
d. Under auto mode, if it’s cooling mode, operation frequency is same as that under cooling mode; if it’s heating mode,
operation frequency is same as that under heating mode.
2. Protection
a. In cooling operation, protection is the same as that under the cooling mode;
b. In heating operation, protection is the same as that under the heating mode;
c. When ambient temperature changes, operation mode will be converted preferentially. Once started, the compressor
will remain unchanged for at least 6 minutes.
(6) Common Protection Functions and Fault Display under COOL, HEAT, DRY and AUTO Modes
1.Overload protection
T tube: measured temperature of outdoor heat exchanger under cooling mode; and measured temperature of indoor
heat exchanger under heating mode.
1) Cooling overload
a. If T tube≤125.6°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≥136.4°F, the compressor will run at reduced frequency.
d. If T tube≥143.6°F, the compressor will stop and the indoor fan will run at preset speed.
2) Heating overload
a. If T tube≤122°F, the unit will return to its original operation state.
b. If T tube≥127.4°F, frequency rise is not allowed.
c. If T tube≥132.8°F, the compressor will run at reduced frequency.
d. If T tube≥140°F, the compressor will stop and the indoor fan will blow residue heat and then stop.
2. Exhaust temperature protection of compressor
If exhaust temperature ≥208.4°F, frequency is not allowed to rise.
If exhaust temperature ≥217.4°F, the compressor will run at reduced frequency.
If exhaust temperature ≥230°F, the compressor will stop.
If exhaust temperature ≤194°F and the compressor has stayed at stop for at least 3 minutes, the compressor will
resume its operation.
3. Communication fault
If the unit fails to receive correct signals for durative 3 minutes, communication fault can be justified and the whole
system will stop.
4. Module protection
Under module protection mode, the compressor will stop. When the compressor remains at stop for at least 3 minutes,
the compressor will resume its operation. If module protection occurs six times in succession, the compressor will not
be started
again.
