SEQUENCE of OPERATION
PAGE 25
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 Ov
O er-current Protection
If the current draw of the compressor at start-up is greater
than the values listed on the chart below for
ff
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.
12A
10A
16A
15A
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 tempe
T
T
rature
When Min(Tpg_indoor , TpgTs)/2) < Tpg1, the freq-
uency of the compressor decreases at the rate of 1HZ / 1
When Tpg_indoor begins
T
T
to rise again, and T
T
T
Tpg3, the frequency of
T
T
the
compressor does not change.
When Tpg3 <
T
T
frequency of the compressor increases at the rate of 1HZ / 10
second
Example: if
32°F sust-
ains for
ains f
ains f 2 minutes, the outdoorunit 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 , TpgTs)/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 , TpgTs)/2) < Tpg2, the freq-
uency of the compressor decreases at the rate of 1HZ / 10
Min(Tpg_i-
ndoor , TpgTs)/2)
Min(Tpg_indoor , TpgTs)/2) <Tpg4, the
second.
Min(Tpg_indoor , TpgTs)/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
Holds
Decrease
Decrease
Over-current
Model
value
1Hz/10s
1Hz/s
point
09K
8A
9A
10A
12A
12K
13A
14A
15A
16A
18K
15A
16A
17A
18A
Summary of Contents for 1U09EH2VHD
Page 2: ... This page intentionally left blank ...
Page 4: ...Failure to follow any CAUTION may in some cases result in grave consequences ...
Page 6: ...PAGE 6 ...
Page 9: ...5VDC and 15VDC pulsing communication connection between the PCB and the IPM ...
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Page 15: ...Connector for coil temperature sensor and room temperature sensor ...
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Page 26: ...PAGE 32 ...
Page 50: ...Error Code E7 LED1 15 Flash Wiring Diagram Reference PAGE 50 ERROR CODES and Troubleshooting ...
Page 57: ...PAGE 57 Ambient Defrost and Pipe Sensor Tables Discharge Sensor Tables ...
