Fujitsu AOTG30KMTC, Service Manual, Page: 155 / 199

7-11. 4-way valve control
• If heating mode is selected at the compressor start, 4-way valve is energized for heating.
• When the air conditioner is switched between cooling and heating mode, compressor is stopped,
and the 4-way valve is switched when the 3 minutes passes and the compressor is started.
200
ms
1,500
ms
200
ms
2,000±100
ms
Compressor
4-way valve
power supply
4-way valve
polarity
4-way valve
switching
Heating mode
Cooling mode
7-12. Demand response operation
This product is designed to be compatible with Air Conditioning Demand Response program.
When your electricity supplier activates one of the following 3 Demand Response (DR) modes, the
air conditioner switches over to the appropriate operation, and the operation indicator (green) on the
indoor unit blinks to inform you it has been entered to the DR mode.
DR mode Description of operation
DR mode 1 Compressor off
DR mode 2
The air conditioner continues to cool or heat during the demand response event, but
electrical energy consumed by the air conditioner in a half hour period is not more than
50% of the total electrical energy that would be consumed if operating at the rated
capacity in a half hour period.
DR mode 3
The air conditioner continues to cool or heat during the demand response event, but
electrical energy consumed by the air conditioner in a half hour period is not more than
75% of the total electrical energy that would be consumed if operating at the rated
capacity in a half hour period.
Blinking pattern and the interval are as follows:
On (4 seconds) Off (0.5 seconds)
On (0.5 seconds) Off (0.5 seconds)
During normal operation
The indicator keep blinking until the unit finishes the function.
NOTES:
• Shape, number, and the arrangement of the indicators are unit-dependent.
• Some indoor units may not have the indicators unless the optional control panel or IR receiver
kit has been installed.
7-11. 4-way valve control
- (04-23) -
7. Various control
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS