Toshiba RAV-GM 801UT-E Service Manual page 54

4. Defrost control
1) During heating operations, defrost operations are performed when the temperature from the TE sensor
satisfies any of the conditions in the A to D zones.
2) During defrosting operations, defrost will be terminated if the temperature from the TE sensor continues
at 12°C or higher for 3 seconds or if the temperature is 7°C ≤ TE < 12°C for 1 minute.
Furthermore the defrost operation will be terminated if defrosting operations have continued for 10
minutes even if TE sensor temperature is less than 7°C.
3) After defrost operations have been reset, the compressor restarts heating operations without stopping.
TE [˚C]
∗ The minimum TE value during 10 and 15 minutes after starting heating operation is stored as TEO.
Status [(TEO-TE) – (ToO-To) ≥ 3˚C] continues for 20 seconds
A Zone
Status [(TEO-TE) – (ToO-To) ≥ 2˚C] continues for 20 seconds
B Zone
C Zone
D Zone
5. Short interrupted operation preventive control
1) Even when a thermostat OFF signal is received from the indoor unit, the compressor may not stop during
3 to 10 minute period after startup in order to protect the compressor.
This operation is not a trouble condition. ( The continuous operation time for compressor differs
depending on the operational status.)
2) When operation is terminated by using a remote controller, operation will not continue.
6. Electrical current release control
An AC current detection value from T10 on the control board is used to suppress the revolution number of
the compressor so that the input current of the inverter does not exceed a specified value.
A Zone Normal operation.
D Zone Maintain frequency of current operation.
B Zone Reduce operating frequency.
Cease reduction of operating frequency
C Zone
and maintain frequency of current operation.
l1 value (A)
Cooling
Heating
0 10 15
–2˚C
–5˚C
–10˚C
–23˚C
∗
When To is normal
Status [TE ≥ 23˚C] continues for 20 seconds
When compressor operation status TE < 2˚C is calculated for 150 minutes
GP80 GP110, 140
17.0 20.0
20.0 20.0
39 45 55
A zone
B zone
C zone
Status [TEO- TE ≥ 3˚C] continues for 20 seconds
Status [TEO-TE ≥ 2˚C] continues for 20 seconds
Current (A)
l1
l1–1.0
– 54 –
150 [min.]
D zone
When To is abnormal
B zone
D zone C zone
A zone