Fujitsu General AOHG45KRTA, Service Manual, Page: 123 / 154

7-3. Current release control
The rotation number of compressor is controlled so that the outdoor unit input current does not ex-
ceeds current limit value set according to the outdoor temperature.
The rotation number of compressor returns according to the operation mode, when the current be-
comes lower than the release value.
¢
Models: AOHG45KRTA and AOHG54KRTA
Operation mode Outdoor temp. (Ta) Trigger condition Release condition
Cooling
52°C ≤ Ta 4.5 A 4.0 A
50°C ≤ Ta < 52°C 5.5 A 5.0 A
46°C ≤ Ta < 50°C 6.5 A 6.0 A
42°C ≤ Ta < 46°C 7.5 A 7.0 A
2°C ≤ Ta < 42°C 8.5 A 8.0 A
Ta < 2°C 10.0 A 9.5 A
Heating
20°C ≤ Ta 6.5 A 6.0 A
16°C ≤ Ta < 20°C 7.0 A 6.5 A
12°C ≤ Ta < 16°C 8.0 A 7.5 A
2°C ≤ Ta < 12°C 8.5 A 8.0 A
Ta < 2°C 10.0 A 9.5 A
7-4. Indoor unit fan motor over temperature protection
The fan motor over temperature protection activates after two judgments when fulfilling any of the
following conditions.
• Detected that the rotation number of the fan motor stays 300 rpm or less for 10 seconds after 90
seconds from the fan operation started.
• IPM trip protection activates.
• Current overload protection activates.
At first, the function determines if any of the above conditions apply (First judgment). If any of the
above conditions apply after the first judgment, the function will make the second judgment after 6
minutes. If any of the above conditions still apply in the second judgment, fan motor over tempera-
ture protection activates.
• Protection details
The function lowers the static pressure by 20 Pa. If the problem is not resolved even at the mini-
mum static pressure, the unit operates as follows.
– Fan motor error will be displayed if the fan motor speed stays 300 rpm or less for 10 seconds
after 90 seconds from the fan operation started.
– The fan stops 40 seconds after the activation of the IPM trip protection.
– The fan stops 50 seconds after the activation of the current overload protection.
7-3. Current release control
- (04-29) -
7. Various protections
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS