GE Altitude Series Service Manual

SEQUENCE OF OPERATION
PAGE 27
ENGLISH
Anti-Freeze Protection of the Indoor Coil
The temperature sensed by the indoor unit coil sensor is used
to determine what frequency the compressor is to run at for
freeze protection.
Tpg_indoor: indoor unit pipe sensor temperature
When Tpg_indoor < Tpg1, the frequency of the compressor
decreases at the rate of 1HZ / 1 second.
When Tpg_indoor < Tpg2, the frequency of the compressor
decreases at the rate of 10HZ / 10 seconds.
When Tpg_indoor begins to rise again, and Tpg2 ≤ Tpg_indoor
≤ Tpg3, the frequency of the compressor does not change.
When Tpg3 < Tpg_indoor <Tpg4, the frequency of the com-
pressor increases at the rate of 1HZ / 10 seconds.
Example: if Tpg_indoor ≤ 32°F sustains for 2 minutes, the
outdoor unit will stop and indicate an underload malfunction
code at the outdoor unit. The compressor stops for a mini-
mum of 3 minutes. When Tpg_indoor >Tpg4, the compressor
will restart.
59°F // ice_temp_3+5
46°F // ice_temp_3+2
43°F
Decreasing slowly
Decreasing rapidly ice_temp_1
Stop
Keeping the frequency
Increasing slowly
32°F
37°F
41°F
43°F
48°F
Anti-Freeze Protection of the Base Pan
To prevent freezing; the base pan equipped with electrical
heater. Its operational conditions are as follows:
If outdoor temperature is above 37.4°F, the electrical base
pan heater is o.
Between 24.8°F and 33.8°F outdoor temperature; the elec-
trical base pan heater is o for 20 minutes, then on for 10
minutes.
Between 10.4°F and 24.8°F; the electrical base pan heater is
o for 15 minutes, then on for 15 minutes. If outdoor tem-
perature <10.4°F, the electrical base pan heater is on.
Overheating Protection For Indoor Unit
The indoor coil sensor senses the temperature of the indoor
coil.
If the temperature sensed is greater than 133°F, the com-
pressor frequency will decrease to prevent overheating of
the heat exchanger.
If Tc >= 133°F for more than 10 seconds, the compressor will
stop and an error code will be indicated at the outdoor unit.
If the compressor is o for 3 minutes and Tc <118°F, the com
-
pressor will restart.
If the temperature sensed is lower than 118°F, the protection
function is cancelled.
HSU12HG(DB)-SM Wiring Diagrams
25
Domestic Air Conditioner
5.2.5.2˖TC high temperature-preventing control of the indoor heating unit˖
Tpg_indoor is the highest value of the effective indoor unit (start it and it is in accord with the running
state).
The indoor heat exchanger sensor tests the temperature of the indoor heat exchanger. If the
temperature is higher than 55ć, decrease the rotate speed of the compressor and do the high
temperature-preventing protection of the indoor heat exchanger; if the temperature of the indoor heat
exchanger is lower than 47ć, recover to the normal control.
TC The compressor stops Fgh_t1 65ć
Fgh_t1ˉ2
Fgh_t2ˉ2 N Decreasing the frequency rapidly Fgh_t2 59ć
P Decreasing the frequency slowly Fgh_t3 55ć
Fgh_t3ˉ2
Fgh_t4—2 Q Prohibiting increasing the frequency Fgh_t4 51ć
R Increasing slowly Fgh_t5 47ć
Fgh_t5—2
Normal
N˖Decreasing at the speed of 1HZ/1 second
P˖Decreasing at the speed of 1Hz/10 seconds
Q˖Continue to keep the last-time instruction cycle
R˖Increasing at the speed of 1Hz/10seconds
Remarks: the outdoor unit
5.2.5.3 The control of preventing the overcurrent of the compressor˖
ƽDuring the starting process of the compressor, if the curren of the compressor is greater than 17A
for 3 seconds, stop the compressor and alarm, after 3 minutes, start it again, if such state appears 3
times in 20 minutes, stop the compressor and alarm, and confirm the malfunction. Then continue to
run it only after the the power is off.
ƽDuring the starting process of the compressor, if the AC current is greater than 12A, the frequency
of the compressor decreases at the speed of 1HZ/second.
ƽDuring the starting process of the compressor, if the AC current is greater than 10A, the frequency
of the compressor decreases at the speed of 0.1HZ/second.
ƽDuring the starting process of the compressor, if the AC current is greater than 9A, the frequency of
the compressor increases at the prohibited speed.
ƽDuring the starting process of the compressor, if the AC current is greater than 8A, the frequency of
the compressor increases at the speed of no faster than 0.1HZ/second.
149°F
138°F
131°F
124°F
117°F
Compressor Overcurrent Protection
If the current draw of the compressor at start-up is greater
than the overcurrent point listed on the chart below for ap-
proximately 3 seconds, the compressor will stop, and a code
will be indicated at the outdoor unit. After 3 minutes the
compressor will try to restart. If the overcurrent 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.
The frequency of the compressor may change depending on
the current draw at start-up. Refer to the chart and current/
Hz table shown below.
Greater than current 1: Decreases 1Hz/second
Greater than current 2: Decreases 0.1Hz/second
Greater than current 3: No change
Model
Over
Current
Point
(Approx.)
Decline
Speed
Current 1
(Approx.)
Decline
Speed
Current 2
(Approx.)
Decline
Speed
Current 3
(Approx.)
09K 11A 8.5A 8A 7A
12K 13A 10A 9.5A 8.5A
15K 15A 12A 11.5A 10.5A
18K 15A 12A 11.5A 10.5A
24K 17A 13.5A 13A 12A