Loading ...
Loading ...
Loading ...
SEQUENCE of OPERATION
52°F //
48°F //
43°F
Decreasing slowly
●
Decreasing rapidly
Stop
Keeping
the
frequency
Increasing slowly
32°F
Tpg1=37°F
Tpg2=41°F
Tpg3=45°F
Tpg4=48°F
3. Compressor Over-current Protection
If the current draw of the compressor at start-up is greater
than the values listed on the chart below for approximately 3
seconds, the compressor will stop.
After 3 minutes the
compressor will restart. If the over-current condition occurs
3 times in 20 minutes, the system will lock-out, and a code
will be indicated at the outdoor unit. It will be necessary to
remove power to the system to reset the lock-out condi-
tion.
Model
Holds
value
Decrease
1Hz/10s
Decrease
1Hz/s
Over-current
point
09K
12A
10A
●
9A8A
12K
16A
15A14A13A
18K
18A
17A
●
16A15A
4. Anti-freeze Protection of the Indoor Coil
●
The temperature sensed by the coil
●
sensor is used to dete-
rmine at what speed the compressor is to run to avoid the
coil temperature being too cold.
Tpg_indoor: indoor unit pipe sensor temperature
When Min(Tpg_indoor ,
Tpg_indoor+Ts)/2) <
Tpg1, the freq-
uency of the compressor decreases at the rate of 1HZ / 1
When Tpg_indoor begins to rise again, and T
Tpg3, the frequency of the
compressor does not change.
When Tpg3 <
frequency of the compressor increases at the rate of 1HZ / 10
second
Example: if
32°F sust-
ains for 2 minutes, the outdoor unit will stop and indicate an
underload malfunction code at the outdoor unit. The com-
pressor stops for a minimum of 3 minutes. When Min(Tpg_
indoor , Tpg_indoor+Ts)/2)>Tpg4, the compressor will
restart
5. Base Pan Heater
To keep condensate water from freezing inside the cabinet,
a base pan heater is installed at the factory. Refer to the
chart below for the operating parameters.
Ts: outdoor unit Suction Line sensor temperature
second.
When Min(Tpg_indoor , Tpg_indoor+Ts)/2) <
Tpg2, the freq-
uency of the compressor decreases at the rate of 1HZ / 10
Min(Tpg_i-
ndoor ,
Tpg_indoor+Ts)/2)
Min(Tpg_indoor ,
Tpg_indoor+Ts)/2) <Tpg4, the
second.
Min(Tpg_indoor , Tpg_indoor+Ts)/2)
Current Overload Prodection
Outdoor Temperature Pan Heater
37 /3 OFF
28 /-2 to 34 /1 OFF 20min ON 10min
10 /-12 to 25 /-4 OFF 15min ON 15min
10 /-12 ON
Pan Heater Logic
PAGE 68
Loading ...
Loading ...
Loading ...