Toshiba MMU-P0121H Service Manual page 30

3-5-1-3. Outline of main controls
Item
1. Pulse motor valve (1) PMV A (PMV 1, PMV 2) control (using two PMV)
(PMV A, B) control
(2) PMV B (PMV 3) control
2. Outdoor fan (1) Cooling fan control
control
*
Operation explanation and applied data, etc.
1) PMV (Pulse Motor Valve) is controlled between 100 to
1000 pulses during operation.
2) In cooling operation, PMV 1, PMV 2 are fixed with FULL
OPEN status. (PMV 1 = 500 pulses, PMV 2 = 500 pulses)
3) In heating operation, PMV opening is controlled by
detection temperature of TS and TD sensors and detection
value of PS pressure. (Super Heat control)
4) Close fully PMV opening when thermostat is OFF,
operation stops, and the A.C. stops in trouble.
1000
PMV 2
550
500
100
PMV 1
50
Min.
The purpose of PMV B control is to control the liquid
refrigerant bypass for suppressing discharge temp. increase
or compressor internal temp. increase.
1) Opening is controlled with pulses from 0 to 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.
1) Outdoor fan speed (No. of fan driving waves) is controlled
by Pd pressure detection value.
2) 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 detection value. The
server outdoor unit controls the outdoor fan speed (No. of
fan driving waves) with temperature detected by TE
sensor.
Pd pressure
2.2
(MPa)
2.1
2.0
1.9
[ Max. :
1.8
16 waves
1.7
1.6
1.5
[-1 wave/20 sec]
1.4
In down time :
1.3
From 15 waves to 1 wave
1.2
Interval
1.1 control
Cooling fan control controls No. of fan driving waves so that
the detection value of Pd pressure becomes 1.45 to 1.8MPa.
No. of waves can be controlled between 0 wave (STOP) to 16
waves (All waves).
Med. Max.
[+1 wave/20 sec]
From 2 waves to
Max.No.of waves
]
[Hold]
[+1 wave/20 sec]
From 1 wave to
(Up to 5 waves)
Max. No. of waves
In up time : From 0 wave to 1 wave
[0 wave] : 180 sec
[ ]
[1 wave] : 30 sec
3-27
Remarks