12 Daikin IM 972-1
Electrical Installation
Electrical Installation
Wiring
Power Supply
1 All wiring should be made in accordance with the
National Electrical Code. Consult the local power
company to determine the availability of sufficient
power to operate the unit. Check the voltage at power
supply to make sure it corresponds to the unit's RATED
VOLTAGE REQUIREMENT. Install a branch circuit
disconnect near the rooftop, in accordance with the
N.E.C., C.E.C. or local codes.
2 It is important that proper electrical power is available at
the unit. Voltage should not vary more than 10% from
that stamped on the unit nameplate. On three phase units,
phases must be balanced within 3%.
3 For branch circuit wiring (main power supply to unit
disconnect), the minimum wire size for the length of run
can be determined from Table 5 using the circuit
ampacity found on the unit rating plate. Use the smallest
wire size allowable from the unit disconnect to the unit.
Wire size based on 75°C rated wire insulation for 1%
voltage drop.
4 For more than 3 conductors in a raceway or cable, see the
N.E.C. (C.E.C. in Canada) for derating the ampacity of
each conductor.
5 For through-the-base wiring entry, reference Figure 13.
All fittings and conduit are field-supplied for this
application. Reference Table 6 for proper hole and
conduit size.
IMPORTANT: This unit is approved for use with copper
conductors only
connected to unit contactor. Warranty will be
voided if aluminum wire is connected to unit contactor.
Figure 11: Recommended Branch Circuit Disconnect
Location
Figure 12: Base Entry Locations (Cooling Only)
Figure 13: Base Entry Locations (Gas Heat)
DANGER
Power supply to the unit must be disconnected before making
field connections. To avoid electrical shock, personal injury or
death, be sure to rigorously adhere to field wiring procedures
regarding proper lockout and tagout of components.
DISCONNECT
RUN THERMOSTAT
WIRING IN THIS
CHASE TO
CONTROL
BOARD
(2) CAP PLUGS
BASE
CONTROL
ENTRY
BASE
POWER
ENTRY
POWER WIRES
FROM DISCONNECT
TO TERMINAL BLOCK
WASHERS
CONTROL VOLTAGE
KNOCKOUT
WIRE FROM
ZONE THERMOSTAT
STRAIGHT CONDUIT
FITTING
CONDUIT FROM
ZONE THERMOSTAT
CONDUIT FROM
POWER SUPPLY
SIZED PER CHART
STRAIGHT CONDUIT
FITTING SIZED
PER CHART
WIRE SIZE FROM
MIN. CIRCUIT AMPACITY
CUT HOLE
SIZED PER CHART
OR USE KNOCK OUT
GAS LINE
EXTERNAL MANUAL GAS
SHUT-OFF VALVE
RUN THERMOSTAT
WIRING IN THIS
CHASE TO CONTROL
BOARD
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