Toshiba MAR-C104M8-1-PE Service Manual page 53

10.3 Outdoor unit – Valve functions, 2-Pipe and 3-Pipe.
Symbol
4-way reversing valve
Cooling operation
20SF*
4-way reversing valve
Heating operation
High-pressure release
SV1*
solenoid valve
Hot gas bypass solenoid
SV2
valve
Solenoid valve for D.O.L.
SV4
compressor startup
Cooling bypass flow
PMV1
control valve
Outdoor unit – Valve functions, 3-Pipe ONLY.
Gas balance
SV5
SV13 Cooling solenoid valve
Solenoid valve for
SV14
expansion valve
Solenoid valve for
SV16
capillary
Sub heat exchanger
SV15
solenoid valve
Outdoor flow control
PMV2
valve
* Applies to MAR-M104HTM8-1-PE / MAR-F104HTM8-1-PE only
Name of Valve
Description of Function
OFF: Normal operation.
ON: Low load condition when sub heat exchanger
is required. Used in combination with SV15
(3-Pipe ONLY).
ON: Normal operation.
OFF: Defrost operation.
Heating operation.
Energised when TE > 11˚C
Opens when Pd < 13kgf/cm
(For cooling dominant mode and sub heat exchanger
operation Pd < 17kgf/cm
Opens when Outdoor ThO < 0˚C (3-Pipe ONLY).
Opens for gas balance when compressor stops
(2-Pipe ONLY).
Opens when the D.O.L compressor starts for
unloading.
Opens when ThD1 or ThD2 > 110˚C.
Opens when ThS > 20˚C
Opens when compressor stops.
Opens for cooling-only operations.
SV14 opens for heating operation.
SV16 opens for low load conditions during heating
dominant operation.
Opens for sub heat exchanger requirement.
Opens during cooling dominant operation.
Degree of opening depending on cooling / heating
demands.
56
2 G (cooling)
2 G – 3-Pipe ONLY).