– 60 –
NO. Item Specification outline Remarks
1 Pulse motor
valve (PMV)
control
1. PMV1, 2 control (PMV1 and 2)
1) During air conditioner operation, the pulse count of a PMV (pulse motor valve) is
controlled between 90 and 1000.
2) During all cooling, the PMV opening is controlled on the basis of measurements
provided by the TL temperature sensor and the Pd pressure sensor (under cool
control).
3) During all heating, the PMV opening is controlled on the basis of measurements
provided by the TS and TD temperature sensors and the PS pressure sensor
(super heat control).\
4) PMVs are fully closed when the air conditioner is in thermo OFF state or upon
being turned off normally or shut down due to an abnormality.
• During all
heating, collective
heating, PMV
control may be
provided with
PMV1 alone,
operated at 45
pulses
(minimum), with
PMV2 turned off.
PMV 1
PMV 2
1000
550
500
90
45
Minimum Maximum
Opening of PMV1, 2
MAX
1000
PMV1, 2 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)
Mainly cooling operation area
Mainly heating operation area
0
42
2. PMV4 control
1) PMV4 (Pulse Motor Valve) is controlled between 0 and 500 pulses at mainly
cooling / heating operation.
2) PMV4 opening is controlled according to the demand capacity difference (Ton)
between cooling and heating operation.
3) PMVs are fully closed when the air conditioner is in thermo OFF state or upon
being turned off normally or shut down due to an abnormality.
6. CONTROL OUTLINE
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