Toshiba MMU-P0121H Service Manual page 37

3-5-1-4. Other cautions
(1) Cooling operation in low ambient temperature
1) When low pressure is lowered, the freeze prevention control by the indoor unit TC sensor may decrease
the frequency.
2) When low pressure is lowered, the cooling capacity control may decrease the frequency.
3) When discharge temp. sensor value lowers below 60°C, the frequency may be increased over the
receive command from the indoor unit.
4) No. of electro-waves of the outdoor fan decreases, and a low continuous sound may be heard when
power is turned on. (This sound is not abnormal.)
(2) PMV (Pulse Motor Valve)
1) When the power is turned on, a tap sound to initialize PMV is heard. If this sound is not heard, PMV
operation error is considered. However, this sound may not be heard at a place where outside sound
takes precidence.
2) Do not remove the driving part (Head part) of PMV during operation. It may cause error in opening.
3) When transporting (replacing) the set, never keep the driving part removed. The valve is closed, and the
valve is damaged by sealed liquid status.
4) When removing the driving part and attaching it again, push in it securely until a "click" sound can be
heard. Then, turn off the power once, and turn on the power again.
3-5-2. Indoor Unit
Item
1. Power supply (1) Automatic remote controller function set up
is reset.
Based upon the result of selecting indoor unit model, set up and
display range of the remote controller is selected.
2. Operation (1) Based upon the operation select command from the remote
select controller or central controller, the operation mode is selected.
Remote controller command
3. Room temp. (1) Adjustment range
control
Remote controller set up temp.
(2) Operation point with compressor-OFF
(3) Operation temp. precision ± 1°C
(4) Differential 1 deg
(5) Using DIP switch (SW03) of the indoor microprocessor, the control
Temp.
temp. of the room temp. can be corrected in heating operation.
correction
Heating control temp.
Operation explanation and applied data, etc.
STOP
FAN
COOL
HEAT
Operation temp.
SW03 1 ON
SW03 2 ON
+0°C
Control outline
Stops air conditioner.
Fan operation
Cooling operation
Heating operation
In cooling In heating
18 to 29°C 18 to 29°C
18 to 29°C 18 to 29°C
ON OFF OFF
OFF ON OFF
+2°C +4°C +6°C
3-34
Remarks
Operation mode range
Air volume select/Louver
presence
Set temperature
Ts (Max.) = 35°C