Control Outline; Outdoor Unit - Toshiba MMY-MUP0721HT9P-UL Service Manual

5. CONTROL OUTLINE

5-1. Outdoor Unit

Item Description of operation, numerical data, and other information
1. PMV1, 2, 3 control (PMV 1 and 2, 3)
1. Pulse
1) During air conditioner operation, the pulse count of a PMV1 (pulse motor valve 1) is
motor valve
(PMV) controlled between 75 pls and 3000 pls, During air conditioner operation, the pulse
control count of a PMV2, 3 is controlled between 25 pls and 500 pls.
2) During cooling, the PMV opening is controlled on the basis of measurements provided
by the TL temperature sensor and the Pd sensor (subcool control).
3) During heating, the PMV opening is controlled on the basis of measurements provided
by the TS, TD and TG temperature sensor and the Ps sensor
(superheat control).
4) PMVs are fully closed when the air conditioner is in thermostat OFF state or upon
being tuned off normally or shut down due to an abnormality.
3000
75
Minimum
2. PMV 4 control
1) During cooling, the pulse count of a PMV 4 (pulse motor valve 4) is controlled
between 30 pls and 350 pls. The PMV 4 opening is controlled on the basis of
measurements provided by the TL3 temperature sensor and Pd sensor
(subcool control). or TS3 temperature sensor and Ps sensor (superheat control).
2) During heating, the pulse count of a PMV4 is controlled between 30 pls and 350 pls.
The PMV 4 operation is controlled by the pulse count of PMV opening of indoor unit
and zone judgment. (Indoor refrigerant excess control)
3) PMVs are fully closed when the air conditioner is in thermostat OFF state, upon being
turned off normally or shut down due to an abnormality.
350
30
PMV1
Maximum
PMV4
Minimum Maximum
500
PMV2, 3
25
Minimum Maximum
350
PMV4
30
Minimum Maximum
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Remarks