Cooling Operation In Low Ambient Temperature; Pmv (Pulse Motor Valve) For Outdoor Unit; Oil Equation Control Schematic Diagram - Toshiba Super MMU-AP0091H Service Manual

<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.

2. PMV (Pulse Motor Valve) for outdoor unit

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 compression.
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.
<Oil equation control schematic diagram>
Header outdoor unit
(MMY-MAP1201HT)
Unit to
send oil
TE1
PMV1 PMV2
Pd sensor
TL
SV3D
Liquid
tank
SV41
HP
FM
TO
4-Way valve
SV5
SV2
Ps sensor
Oil
separator
SV42
HP
SV3C
ON
TD1 TD2
TK3
TK1 TK2
Oil tank
SV3E
TK4
SV3A
ON
SV3B
Balance pipe
Liquid pipe
Gas pipe
PMV1 PMV2
TS1
TL
Liquid
tank
Accumulator
73
Follower outdoor unit
(MMY-MAP1201HT)
FM
TE1
4-Way valve
SV5
SV2
Pd sensor
Ps sensor
OS
SV3D
SV41
HP
SV3C
TD1 TD2
TK3
TK1 TK2
Oil tank
SV3E
TK4
SV3A
SV3B
Unit to
received oil
TO
TS1
SV42
HP
Accumulator
ON