Toshiba MMU-P0121H Service Manual page 31

Item
2. Outdoor fan (2) Heating fan control
control
(Continued)
TE temp. (˚C)
20
(3) Control for fixed-speed unit stop
3. Capacity By the capacity request command from the indoor controller, the
calculation inverter operation command of the master outdoor unit, ON/OFF
control of the fixed-speed compressor and the server outdoor unit
are determined. The master outdoor unit sets up activation
priority order of the server outdoor units connected to the system,
and starts the operation.
<Example of 30HP system>
4. Oil level 1) The volume of oil in the oil tank is judged by the detection
detection control
2) The present temperature detected by TK1, TK2 and TK3
Operation explanation and applied data, etc.
1) Outdoor fan speed (No. of fan driving waves) is controlled
by TE sensor detection temperature.
2) If TE>20°C has been continuously detected for 5 minutes,
the operation may be stopped. In this case, the status is
same as one in usual thermostat-OFF, so restart the
operation.
3) When the high-pressure switch operates frequently under
condition of the above 2), it is considered that air filter of
the indoor unit is contaminates. Clean the filter and restart
the operation.
4) After activation, this control is not performed during the
specified time after defrost operation and defrost control.
5) When refrigerant is extremely shortened, START/STOP
operation may be repeated by this control.
A zone : No. of lower limit waves, Compressor forced stop timer count
B zone : -2 waves/20 sec (up to No. of lower limit waves)
6
C zone : -1 waves/20 sec (up to No. of lower limit waves)
4
D zone : Hold (Held at the current No. of waves)
2
E zone : +1 waves/20 sec (up to Max. No. of waves)
1
F zone : Max. No. of waves (16 waves)
The fan is driven with 1 wave to prevent stagnation of refriger-
ant into the outdoor heat exchanger.
30
Inverter
25
Fixed-speed
20
15
10
5
1
5
Operation capacity (HP)
temperature of TK1 and TK2 sensors.
sensors are stored in memory as the initial value, and then on
the solenoid valve SV3C is activated.
After then, execute sampling of TK1, TK2 and TK3 sensor
temperature, and obtain the temperature change value of TK1
and TK2. Also, whether the oil level is adequate or not is
judged from relation between the set up oil level judgment time
and the above temp. change value, and the operation
transmits to the oil equalizing control if oil is reduced.
10 15 20 25 30
3-28
Remarks