Toshiba MMY-MAP0806HT7(J)P, Service Manual

Page: 69 / 350

Outdoor Unit
Item Description of operation, numerical data, and other information Remarks
1. Pulse
motor valve
(PMV)
control 1. PMV1,
3
control (PMV1 and
3
)
1) During air conditioner operation, the pulse count of a
PMV1 (pulse motor valve 1)
is controlled between
120 pls
and
3
000
pls
.
During air conditioner operation,
the pulse count of PMV3 is controlled between 45 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 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.
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
T
L3 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.
5
Control Outline
45
500
Opening
of PMV3 (pls)
Minimum Maximum
PMV3
120
3000
Opening
of
PMV1 (pls)
Minimum Maximum
PMV1
45
500
O
peni
ng
of PMV
4
dur
ing
cool
ing
(p
ls)
Minimum Maximum
PMV4
0
400
O
peni
ng
of PMV
4
dur
ing
heat
ing (
pls
)
Minimum Maximum
PMV4
−
6 8
−