Daikin GYEQ20AN, Руководство по обслуживанию

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Precautions to Take before Replacement SiAUY361411EA
203 Replacement of Parts
1. Precautions to Take before Replacement
1.1 Safety Precautions
Warning • Turn off the power to the outdoor unit.
Otherwise you may get an electric shock or be caught or jammed in rotating parts when the
unit is inadvertently operated from a remote control unit.
• After turning off the power to the outdoor unit, make sure that none of the LEDs on the
outdoor unit's circuit boards are lit.
Even though the main power has been turned OFF, attempting to access the circuit boards
with any LED lit could result in an electrical shock due to electricity remaining in the circuit.
• Close the fuel gas cock.
Otherwise a gas leak may occur when you replace the engine or fuel system parts.
• The cooling water remains hot for some time after the engine is stopped. Do not attempt to
open the radiator cap until the cooling water temperature is low enough.
Otherwise the cooling water may spout out, possibly resulting in a burn.
Warning • Make sure that fire extinguishing equipment is readily available before performing soldering or
some other task that uses fire.
Take extreme care to prevent oil and any other flammable materials from catching fire.
Take extreme care not to inhale gas or smoke generated when the refrigerant is combusted.
Caution • Take care not to drop a heavy unit or assembly such as the engine or compressor during
replacement.
Also, take care not to pinch your fingers or hands.
• The outdoor unit has various fluids that remain hot for some time after it stops operation, such
as the cooling water and engine oil. Take care when draining such fluids.
• Take care not to touch parts that remain hot for some time after the unit is stopped.
1.2 Safety Precautions for Replacement
• Be sure to have the refrigerant recovered by a recycle company registered with the local
government, not only when replacing refrigerant system parts, but also when just servicing the
refrigerant system.
Also, have the refrigerant charged by a high pressure gas vendor.
• When recovering the refrigerant, turn OFF the outdoor unit’s power supply only and do not
turn OFF the indoor unit’s power supply.
When turning OFF the indoor unit’s power supply, be sure to follow the procedure on
page
210 [2.5 Charging the Refrigerant] for charging refrigerant.
• After replacing a part, any parts (such as harnesses/cables and hoses) that were connected
with the old part must be connected to the new part by exactly restoring the original path,
clamping method, position, and so on. They must not contact edges or vibrating areas. Also,
take care not to misconnect connectors. To ensure that the original conditions can be exactly
restored, take photographs or sketches or apply markings as appropriate before replacement.
• Connect connectors while checking the electrical connection diagram.
Note that connectors are identified by shape and color. The connectors with the same shape
and color are identified by labels (color and number) on the harness side. Also, the major
connectors on the PCB are described with the actuator name (number) to be connected, so
refer to the shape, color, label and indication on the PCB and take care not to misconnect
connectors.
• Take care not to spill engine oil, cooling water, and so on.
• After replacing refrigerant system parts, perform an air tightness test and evacuation of the
refrigerant system.
• Make sure that the wiring terminals do not touch the circuit board or body, and cover the
removed terminals, for example by using insulation tape.
• Make sure that the types and sizes (length in particular) of the bolts and nuts are correct.
• After completing inspection or repair, be sure to perform sufficient actuator checks and test
runs to ensure that operation is normal.