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Motor Terminal Insulation above 600 Volts
It is the installing contractor's responsibility to insulate the compressor motor terminals when the unit
voltage is 600 volts or greater. This is to be done after the Daikin start-up technician has checked for
proper phase sequence and motor rotation.
Following this verification by the Daikin technician, the contractor should obtain and apply the following
items on medium voltage (above 600 volts) applications.
Materials Required:
1.
Loctite
brand safety solvent (12 oz. package available as Daikin part number 350A263H72)
2.
3M
Co. Scotchfil brand electrical insulation putty (available in a 60-inch roll as Daikin part
number 350A263H81)
3.
3M Co. Scotchkote
brand electrical coating (available in a 15 oz. can with brush as Daikin Part
Number 350A263H16)
4.
Vinyl plastic electrical tape
The above items are available at most electrical supply outlets.
Application Procedure:
1.
Disconnect and lock out the power source to the compressor motor.
2.
Using the safety solvent, clean the motor terminals, motor barrel adjacent to the terminals, lead
lugs, and electrical cables within the terminal box to remove all dirt, grime, moisture and oil.
3.
Wrap the terminal with Scotchfil putty, filling in all irregularities. The final result should be
smooth and cylindrical.
4.
Doing one terminal at a time, brush the Scotchkote coating on the motor barrel to a distance of up
to 2" around the terminal and on the wrapped terminal, the rubber insulation next to the terminal,
and the lug and cable for approximately 10". Wrap additional Scotchfil insulation over the
Scotchkote coating.
5.
Tape the entire wrapped length with electrical tape to form a protective jacket.
6.
Finally, brush on one more coat of Scotchkote coating to provide an extra moisture barrier.
Control Power Wiring
The control circuit on the Daikin centrifugal packaged chiller requires 220VAC 3-phase (200-240VAC).
Control power can be supplied from three different sources:
1.
A freestanding starter furnished by Daikin, or the customer to Daikin specifications, will have a
control transformer in it requiring field wiring to terminals in the control box.
2.
Power can be supplied from separate circuits and fused at 20 amps inductive load. The control circuit
disconnect switch must be tagged to prevent current interruption. Other than for service work, the
switch is to remain on at all times in order to keep oil heaters operative and prevent refrigerant from
diluting in oil
.
DANGER
If a separate control power source is used, the following must be done to avoid severe
personal injury or death from electrical shock:
Place a notice on the unit that multiple power sources are connected to the unit.
Place a notice on the main and control power disconnects that additional sources of power
to the unit exist
!
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