Toshiba MMU-P0121H Service Manual page 150

3-12-5. Replacement of Heat Exchanger
• Recover the refrigerant.
• If the heat exchanger is installed by connection, remove the connecting pipe and pull out the outdoor unit.
• Remove the discharge cabinet. (M5 x 4)
• Remove the front panel. (M5 x 7)
• Remove the suction panel at the front side. (M5 x 4, M4 x 2)
• Remove the panel at the rear side. (M5 x 7)
• Remove the suction panel at the rear side. (M5 x 4, M4 x 2)
• Remove the left and right side plate. (M5 x 16, M4 x 4)
• Remove the fan base. (M8 x 4)
• Remove the waterproof board. (M4 x 3)
• Remove the screws fixing the waterproof board. (M4 x 2)
• Remove the evaporator cover at left and right sides. (M5 x 4, M4 x 1)
• Remove the temperature sensor for defrost operation. (1 pc)
• Remove the heat exchanger at the front and rear sides. (M5 x 4, four brazing positions)
• Replace the heat exchanger.
3-12-6. Replacement of Oil Separator
• Recover the refrigerant.
• Remove the front panel. (M5 x 7)
• Remove the rear panel. (M5 x 7)
• Disconnect all wires connected to the electric parts box.
Temp. sensor, pressure sensor, complete, 2-way valve, PMV A
*
( : It is not provided in the cooling only model.)
• Remove the electric parts box. (M5 x 4, M4 x 3)
Since the upper part of the box is formed as hanging shape, lift up the box and pull out toward you.
• Remove the cooling duct for electric parts. (M5 x 5)
• Remove the pipe connected to oil separator.
NOTE :
Take a great care that, in case of removing the pipe by heating with a torch the brazed part, if oil is remaining in
the pipe, a flame may be emitted at the moment when flux has been melted.
• Remove the screws fixing oil separator. (M6 x 3)
• Replace the oil separator.
3-12-7. Replacement of Pressure Sensor
• Remove the front panel. (M5 x 7)
• Remove lead wire connector of the pressure sensor to be replaced from the interface P.C. board.
• Braze capillary tube of the pressure sensor to be replaced after pinching, and remove it from the refriger-
ating cycle.
• Remove the pressure sensor to be replaced from the pressure sensor mounting board. (M4 x 1)
• Mount the pressure sensor for servicing to the pressure sensor mounting board. (M4 x 1)
• Mount the lead wire connector of the pressure sensor for servicing to the interface P.C. board.
• Connect the flare to the check joint of the piping part.
The check joints are provided in one position at high pressure side and low pressure side each.
*
, PMV B and 4-way valve
3-147
*
, etc.