Special Precautions When Dealing With R410A Unit - McQuay C Serie Installationsanleitung

• All wires must be firmly connected.
• Make sure all the wire do not touch the refrigerant pipings, compressor or any moving parts.
• The connecting wire between the indoor unit and the outdoor unit must be clamped by using provided cord anchorage.
• The power supply cord must be equivalent to H07RN-F which is the minimum requirement.
• Make sure no external pressure is applied to the terminal connectors and wires.
• Make sure all the covers are properly fixed to avoid any gap.
• Use round crimp-style terminal for connecting wires to the power supply terminal block. Connect the wires by matching
to the indication on terminal block. (Refer to the wiring diagram attached on the unit).
• Use the correct screwdriver for terminal screws tightening. Unsuitable screwdrivers can damage the screw head.
• Over tightening can damage the terminal screws.
• Do not connect wire of different gauge to same terminal.
• Keep wiring in an orderly manner. Prevent the wiring from obstructing other parts and the terminal box cover.
Connect wires of the
same gauge to both
side.

SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT

• Never use refrigerant other than R410A in an air
conditioner which designed to operate with R410A.
• Since R410A is a mixed refrigerant, any additional
refrigerant must be charged in liquid state for better
performance compared to in gas state.
• POE oil is used as lubricant for R410A compressor, which
is different from the mineral oil used for R22 compressor.
During installation or servicing, extra precaution must be
taken not to expose the R410A system too long to moist
air. Residual POE oil in the piping and components can
absorb moisture from the air.
• To prevent mischarging, the diameter of the service port on
the flare valve is different from that of R22.
Attach insulation sleeve
Round crimp-style terminal
Do not connect wires
of the same gauge to
one side.
• Use tools and materials exclusively for refrigerant R410A.
• As an R410A air conditioner incurs higher pressure than
• If the refrigerant gas leakage occurs during installation/ser-
• When installing or removing an air conditioner, do not
1-9
Electric wire
Do not connect wires
of different gauges.
Tools exclusively for R410A are manifold valve,
charging hose, pressure gauge, gas leak detector, flare tools,
torque wrench, vacuum pump and refrigerant
cylinder.
R22 units, it is essential to choose the copper pipes
correctly. Never use copper pipes thinner than 0.8mm even
though they are available in the market.
vicing, be sure to ventilate fully. If the refrigerant gas comes
into contact with fire, a poisonous gas may occur.
allow air or moisture to remain in the refrigerant cycle.