Control Outline; Outdoor Unit; Pmv1, 3 Control; Pmv4 Control - Toshiba MMY-MAP0806HT8P Service Manual

5

Control Outline

Outdoor Unit

Item Description of operation, numerical data, and other information
1. PMV1, 3 control (PMV1 and 3)
1. Pulse
1) During air conditioner operation, the pulse count of a PMV1 (pulse motor valve 1)
motor valve
is controlled between 120pls and 3000pls.
(PMV)
the pulse count of PMV3 is controlled between 45pls and 500pls.
control
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).
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).
4) PMVs 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.
3000
120
Minimum

2. PMV4 control

1) During cooling, the pulse count of a PMV4 (pulse motor valve 4 ) is controlled
between 45pls and 500pls.
The PMV4 opening is controlled on the basis of measurements provided by the
TL3 tenperature sensor and PD pressure sensor (Subcool control),
or TS3 temperature sensor and PS pressure sensor (super heat control).
2) During heating, the pulse count of a PMV4 is controlled between 0pls and 400pls.
The PMV4 opening is controlled on the basis of measurements provided by
the TD1 or TD2.
500
45
PMV1
Maximum
PMV4
Minimum Maximum
During air conditioner operation,
500
PMV3
45
Minimum Maximum
400
PMV4
0
Minimum Maximum
− 68 −
Remarks