8
Check after
repair
Once the repair work has been completed, check for the insulation resistance.
Then perform a trial run to check that the Air to Air Heat Exchanger with DX Coil Unit is running properly.
After repair work has finished, check there is no trouble. If check is not executed, a fire, electric shock or
injury may be caused. For a check, turn off the power breaker.
After repair work (installation of electrical control cover and inspection cover) has finished, execute a test run
to check there is no generation of smoke or abnormal sound.
If check is not executed, a fire or an electric shock is caused. Before test run, install the electrical control
cover and inspection cover.
Be sure to fix the screws back which have been removed for installation or other purposes.
Do not operate
the unit with the
valve closed.
Check the following matters before a test run after repairing piping.
• Connect the pipes surely and there is no leak of refrigerant.
• The valve is opened.
Running the compressor under condition that the valve closes causes an abnormal high pressure resulted
in damage of the parts of the compressor and etc. and moreover if there is leak of refrigerant at connecting
section of pipes, the air is sucked and causes further abnormal high pressure resulted in burst or injury.
Check after
reinstallation
Only a qualified installer (*1) or qualified service person (*1) is allowed to relocate the Air to Air Heat
Exchanger with DX Coil Unit. It is dangerous for the Air to Air Heat Exchanger with DX Coil Unit to be
relocated by an unqualified individual since a fire, electric shocks, injury, water leakage, noise and / or
vibration may result.
Check the following items after reinstallation.
1) The earth wire is correctly connected.
2) The power cord is not caught in the product.
3) There is no inclination or unsteadiness and the installation is stable.
If check is not executed, a fire, an electric shock or an injury is caused.
When carrying out the pump-down work shut down the compressor before disconnecting the refrigerant pipe.
Disconnecting the refrigerant pipe with the service valve left open and the compressor still operating will
cause air, etc. to be sucked in, raising the pressure inside the refrigeration cycle to an abnormally high level,
and possibly resulting in reputing, injury, etc.
Cooling check
When the service panel of the outdoor unit is to be opened in order for the compressor or the area around
this part to be repaired immediately after the Air to Air Heat Exchanger with DX Coil Unit has been shut down,
set the circuit breaker to the OFF position, and then wait at least 10 minutes before opening the service panel.
If you fail to heed this warning, you will run the risk of burning yourself because the compressor pipes and
other parts will be very hot to the touch. In addition, before proceeding with the repair work, wear the kind of
insulated heat-resistant gloves designed to protect electricians.
Take care not to get burned by compressor pipes or other parts when checking the cooling cycle while
running the unit as they get heated while running. Be sure to put on gloves providing protection for electric
shock and heat.
When the service panel of the outdoor unit is to be opened in order for the fan motor, reactor, inverter or the
areas around these parts to be repaired immediately after the Air to Air Heat Exchanger with DX Coil Unit
has been shut down, set the circuit breaker to the OFF position, and then wait at least 10 minutes before
opening the service panel.
If you fail to heed this warning, you will run the risk of burning yourself because the fan motor, reactor, inverter
heat sink and other parts will be very hot to the touch.
In addition, before proceeding with the repair work, wear the kind of insulated heat-resistant gloves designed
to protect electricians.
Summary of Contents for MD-VNK802HEXE
Page 120: ...118 11Owner s Manual Excerpt ...
Page 137: ...135 12Installation Manual Excerpt ...
