Toshiba A90-0132, Руководство по обслуживанию

Страница: 55 / 176

55
11
Outline of control
Outdoor unit
Item Operation explanation and applied data, etc. Remarks
1a. Electronic (1) PMV A control (PMV x 2)
expansion 1) The PMV (pulse motor valve) is controlled between 100 ~ 1000
valve (PMV) pulses during the operation.
control 2) The PMV is fully open during the cooling operation
(PMV A1 = 500 pulses, PMV A2 = 500 pulses).
3) During the heating operation, the opening rate is determined by the
temperature which the TS/TD sensor detects and the pressure rate which PS
detects (Super heat control).
4) The PMV is fully open when the thermostat is off, when the operation is
switched off or when the operation is ceased under abnormal circumstances.
Min. Med. Max.
PMV
opening
rate
1000
PMV A2
PMV A1
50
100
500
550
1b. Pulse motor (1) PMV B control
valve (PMV) The purpose of PMV B control is to control the liquid refrigerant bypass by limiting
control discharge temperature or compressor internal temperature increase.
1)
Opening is controlled with pulses from 0 ~ 500.
2) PMV opening is controlled with temp. detected by TS/TD sensors.
3) PMV openings are fully closed during thermostat-OFF, operation stop, and
emergency stop.
2a. Outdoor fan (1) Cooling fan control
control 1) In a specified time when cooling operation is activated, the master outdoor unit
controls the outdoor fan speed (no. of fan driving waves) by Pd pressure. The
slave outdoor unit controls the outdoor fan speed with temperature detected by
TE sensor.
Pd pressure
(kgf/cm
2 G)
22
21
19
18
17
16
15
14
13
12
11
[+1 wave/20 sec.]
From 2 waves to
Max. no. of waves
Max.
16 waves
[-1 wave/20 sec.]
In down time:
From 15 waves to 1 wave
[Hold]
From 1 wave to
Max. no. of waves
[+1 wave/20 sec.]
(Up to 5 waves)
In up time: From 0 wave to 1 wave
Interval [0 wave]:180 sec.
control [1 wave]:30 sec.
* PD pressure is maintained between 14.5 ~ 18 kgf/cm 2 G by the cooling fan control.
The no. of waves can be controlled between 0 wave (STOP) to 16 waves (all waves).