Test Run; Pumping Down - Mitsubishi Electric MFZ-KA25VA Installation Manual

4. TEST RUN

4-1. TEST RUN
Make sure the following is done.
• The area around the damper is free of any objects, and the movement of the damper is not blocked.
• Panel is installed correctly.
• Indoor and outdoor units are installed correctly, and power is supplied.
1) Press the E.O. SW once for COOL, and twice for HEAT operation. Test run will be performed for 30
minutes. If the left lamp of the operation indicator blinks every 0.5 seconds, inspect the indoor/outdoor
unit connecting wire (A) for mis-wiring. After the test run, emergency mode (set temperature 24ºC) will
start.
2) To stop operation, press the E.O. SW several times until all LED lamps turn off. Refer to operating in-
structions for details.
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller (12) and check that an electronic sound is heard from
the indoor unit. Press the ON/OFF button again to turn the air conditioner off.
• Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.
4-2. AUTO RESTART FUNCTION
This product is equipped with an auto restart function. When the power supply is stopped during operation, such as during blackouts, the function automati-
cally starts operation in the previous setting once the power supply is resumed. (Refer to the operating instructions for details.)
Caution:
• After test run or remote signal reception check, turn off the unit with the E.O. SW or the remote controller before turning off the power supply. Not do-
ing so will cause the unit to start operation automatically when power supply is resumed.
To the user
• After installing the unit, make sure to explain the user about auto restart function.
• If auto restart function is unnecessary, it can be deactivated. Consult the service representative to deactivate the function. Refer to the service manual
for details.
4-3. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air fil-
ters, how to remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.)
• Recommend the user to read the OPERATING INSTRUCTIONS carefully.

5. PUMPING DOWN

When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmos-
phere.
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
MPa [Gauge] (0 kgf/cm
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 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm
6) Stop the emergency COOL operation.
Press the E.O. SW twice to stop the operation.
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it.
8
2
).
WARNING
Emergency
operation switch
(E.O. SW)
2
).