83
4.6 HEATING HIGH-LOAD CONTROL
Performed by A3 board
This system controls the inverter frequency when the high pressure's abnormal increase and high-load operating
prevention occur in the heating mode.
In accordance with the temperature of the water heat exchanger temperatures sensor (E1, E2), such controls are
performed as to limiting the increase of inverter frequency, decreasing it or halting operation of the compressor.
When the maximum temperatures (E1, E2) exceeds 64°C, the operation is halted and restarted after 3 minutes.
type 95 125 155 157 175 177 195 197 257 307
a
64 64 63 63 63 63 63 63 63 63
b
58 58 58 58 58 58 58 58 58 58
c
54 54 55 55 55 55 55 55 55 55
4.7 FREEZE PREVENTION CONTROL IN COOLING MODE
Performed by A3 board
The following control is performed during cooling operations, in accordance with the lowest water heat exchanger
temperatures (E1 or E2). (See the chart below.)
(1) If the temperature remains in the "J" zone (decreasing operation frequency) for 6 minutes, the operating
frequency of the compressor is decreased.
The operation frequency is amended every 30 seconds as long as the temperature is in this zone.
(2) If the temperature is in the "K" zone (operating frequency increase prevention zone), the operating frequency
of the compressor is maintained.
(3) If the temperature is in the "H" zone (operating frequency restriction zone) and the outdoor air temperature is
less than 32°C, the maximum operating frequency of the compressor is limited.
(4) If the temperature is in the "I" zone (normal operation zone), normal operations are performed.
(5) If the temperature is continuously in the "J" zone with the compressor's operating frequency reaches "0",
then temperature A, which is temperature for changing from the "J" zone to the "H" zone, is raised from 5°C
to 8°C, and operation continues until the temperature enters the "H" zone.
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