6-2. Outdoor Unit
Item Description of operation, numerical data, and other information Remarks
1. Pulse
motor valve
(PMV)
control
1. PMV1, 3 control (PMV1, 3)
1)During air conditioner operation, the pulse count of a PMV1 (pulse motor valve 1)
is controlled between 100pls and 3000pls. During air conditioner operation.
2)During cooling, the PMV opening is controlled on the basis of measurements
provided by the TL temperature sensor and the PD pressure sensor (subcool
control). (PMV1 close, PMV3 control)
3)During heating, the PMV opening is controlled on the basis of measurements
provided by the TS, TD and TG temperature sensors and the PS
pressure sensor (super heat control). (PMV1 control, PMV3 close)
4)PMV are fully closed when the air conditioner is in thermostat OFF state or upon
being turned off normally or shut down due to an abnormality.
100
3000
Opening of PMV1,3 (pls)
Minimum Maximum
PMV1,3
− 56 −
MAX
1000
PMV1 opening
Controlled between
90 and 1000 pulses
– 10
SH control
2
Cooling-heating demand capacity difference (Ton)
0
MAX
500
PMV4 opening
– 2 0 10
Cooling-heating demand capacity difference (Ton)
Collective cooling operation area
Collective heating operation area
0
45
2. PMV4 control
1) PMV4 (Pulse Motor Valve) is controlled between 0 and 500 pulses at collective
cooling / heating operation.
2) PMV4 opening is controlled according to the demand capacity difference (Ton)
between cooling and heating operation.
3) PMV are fully closed when the air conditioner is in thermostat OFF state or
upon being turned off normally or shut down due to an abnormality.
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