Specifications

158
3) The compressor starts operation with the operation pattern shown in the following diagram after 3 minutes' stop.
(b) When the compressor has kept on stopping for 2 minutes and 45 seconds or more:
1) The heating output is changed over immediately.
2) The motion of compressor and 4 way valve is the same manner as described in Article (a).
(c) When the stop time of compressor is less than 2 minutes and 45 seconds:
1) The heating output is changed over after 2 minutes and 45 seconds has passed since the compressor stop.
2) The motion of compressor and 4 way valve is the same manner as described in Article (a).
Indoor
unit
Operation
mode
Heating
Cooling
ON
ON
OFF
OFF
Compressor
Heating
output
ON
or
OFF
4 way valve
(20SL, 20SS)
Initial operation
pattern
Initial operation
pattern
2 min.
2 min.
2 min. and 45 sec.
2 min. and 45 sec.
3 min.
3 min.
(11) Devices related to unit protection and maintenance
(a) Test run mode
The test run mode can be set from the outside by using the switch SW3-4,5 on the outdoor unit control circuit board
(i) Switch function
Remarks : Fuzzy control is not performed in test run operation.
(Operation is executed.) Other controls are effective.
(ii) The maximum frequency of outdoor unit in test run operation (At the time of rated capacity)
SW3-4
SW3-5
ON
OFF
ON
OFF
Function
• To operate all connected indoor units.
• Indoor units demands the maximum frequency and outdoor units are operated with the maximum frequency
according to request from the indoor unit.
• Normal operation
• When SW3-4 is set to ON: Cooling operation
• When SW3-4 is set to ON: Heating operation
Switch
Maximum operation frequency (Hz)
FDCP224, 280 type
95
Model
(b) Expansion valve control for oil return
After the compressor operated for 10 hours, and when the compressor is turned, stop the compressor to collect refrigerant
oil, turn off the thermostat, and fully open indoor unit expansion valves of FAN and adnormally stopped units one by one.
(Open expansion valves in the sequence that addresses were registered to outdoor units and not of the address number.
(c) High pressure control in heating operation
When (63H2) [2.84 close/2.26 open MPa] operates, the compressor revolution decrease 10 Hz, and outdoor unit fan stops
preventing pressure increase. Frequency control is canceled after 6 minutes from reset of 63H2, then the compressor
returns to the normal operation.
Note (1) Detail of Frequency Control Canceling Operation
When a high pressure control is canceled, the frequency increases 5 Hz, and the frequency is retained for 3 minutes. The
frequency increases 5 Hz every 3 minutes to the normal operation.