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Cold Air Prevention (Heating mode with compressor running)
The system guards against discharging cold air in heating mode. It will delay the indoor fan until the evaporator coil has
warmed up to discharge warm, comfortable air into the room.
1) When the T
indoor
ambient < 750 F and the T
indoor
tube <= 1040 F with the fan in a stopped state, the indoor fan will begin
to run at low speed after a 2 minute delay. This will reduce cold air upon heating startup. Within 2 minutes, if
T
indoor
tube > 1040 F, the indoor fan will run at low speed. After 1 minute of operation, the fan will run at the preset fan
mode. Within 1 minute of low speed operation or 2 minutes of no fan operation, with the T
indoor
tube > 1080 F, the fan will
run at the preset mode.
2) If the T
indoor
ambient >= 750 F and the T
indoor
tube <= 1080 F the indoor fan will run at low speed for 1 minute than run
at the preset mode. After 1 minute of low speed operation, if the and the T
indoor
tube > 1080 F the fan will operate at its
preset mode.
Note:
The T
indoor
ambient in 1 & 2 above refers to the unit going into the heating mode coming out of defrost.
Overcurrent and Speed Protection (
Total Current = I
total
)
The software will monitor the compressor current draw and adjust the compressor speed in order to maintain the inverter and
compressor in a safety and reliable operating range.
A. If I
total
<= 6, an increase in frequency will be allowed
B. If I
total
>= 7, increasing the frequency is not allowed.
C. If I
total
>= 8, the compressor will decrease its frequency
D. If I
total
>= 9, the compressor will stop and the indoor fan will stop after 30 seconds.
4)Fan Mode
Under this mode, the fan will run at the preset speed and the outdoor fan, compressor and 4-way valve will stop.
5)Auto Mode
Auto Mode Process
Setting the auto mode will run the unit in heat or cool automatically depending on T
indoor
ambient
1)Operating Parameters
A. If the T
indoor
ambient >= 790 F the unit will operate in cooling mode. The set temperature is 770 F.
B. If the T
indoor
ambient <= 720 F the unit will operate in heat mode. The set temperature is 680 F.
C. When the T
indoor
ambient <= 730 F and >= 770 F, the unit will operate in the previous state. If it is energized
for the first time, it will run in Fan mode
D. In auto mode, the cooling frequency will be the same as the cooling only mode and the heating frequency will
be the same as the heating only mode.
2) Protection
A. In cooling operation, protection is the same as the cooling only mode
B. In heating operation, protection is the same as the heating only mode
C. When the indoor ambient temperature changes, the operation mode will be automatically selected. Once started
the compressor will have a 6 minute runtime.
Basic Functions
Product Introduction
