Pumping Down - Mitsubishi Electric MSZ-GS18NA Installation Manual

5-2. REMOVING THE INDOOR UNIT
Remove the bottom of the indoor unit from the installation plate.
When releasing the corner part, release both left and right bottom corner part of

5-3. PUMPING DOWN

When relocating or disposing of the air conditioner, pump down the system following the procedure below so that refrigerant is not released into the atmosphere.
1) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
2) Fully close the stop valve on the liquid pipe side of the outdoor unit.
3) Close the stop valve on the gas pipe side of the outdoor unit almost completely so that it can be easily closed fully when the pressure gauge shows 0 psi [Gauge] (0 Mpa).
4) Start the emergency COOL operation.
To start the emergency operation in COOL mode, disconnect the power supply plug and/or turn off the breaker. After 15 seconds, connect the power supply plug and/or turn
on the breaker, and then press the E.O. SW once. (The emergency COOL operation can be performed continuously for up to 30 minutes.)
5) Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure gauge shows (0.1 to 0 psi [Gauge] (0.05 to 0 Mpa)).
6) Stop the emergency COOL operation.
To stop operation, press the E.O. SW several times until all LED lamps turn off. Refer to operating instructions for details.
When the refrigeration circuit has a leak, do not execute pump down with the compressor.
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if air etc. get into it.
6. CONNECTING THE INTERFACE/CONNECTOR CABLE TO THE AIR CONDITIONER
• Connect the INTERFACE/CONNECTOR CABLE to the Indoor electronic control P.C. board of the air conditioner with the connecting cable.
• Cutting or extending the connecting cable of the INTERFACE/CONNECTOR CABLE results in defects in connecting.
Do not bundle the connecting cable together with power supply cord, indoor/outdoor connecting wire, and/or earth wire. Keep as much distance as possible between the
connecting cable and those wires.
• The thin part of the connecting cable should be stored and placed where customers cannot touch it.
Connecting
Indoor control
P.C. board holder
WARNING
Thin part of the connecting cable.
Place this part where customers cannot touch it.
Air conditioner
Indoor control P.C.
CN105
board
(1) Remove the panel and the lower right corner box.
(2) Open the indoor control P.C. board holder 90 degrees and remove it.
(3) Join the connecting cable to CN105 on the indoor control P.C. board.
(4) Attach the cable clamp provided with the interface to the thick part of the connecting cable with
(6) Install the indoor control P.C. board holder and then stow the extra connecting cable where
Thick part of the connecting cable
Fix the connecting cable at the prescribed position securely. Incorrect installa-
HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU,
TOKYO 100-8310, JAPAN
Interface unit
Connector
WARNING