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ampacity found on the unit rating plate. Use the smallest
wire size allowable in Table 5 from the unit disconnect to
unit.
NOTE: A bracket is provided with the unit for mounting the
branch circuit disconnect to the unit. This is the
recommended location for the disconnect. See Figure 16.
Table 5: Branch Circuit
COPPER WIRE SIZE
(BASED ON 1% VOLTAGE DROP)*
200
6
4
4
150
8
6
6
100
10
8
8
50
14
12
10
15
20
25
BRANCH CIRCUIT AMPACITY
SUPPLY WIRE
LENGTH-FEET
*Taken from National Electric Code
4 For through the base wiring entry reference Figure 17.
All fittings and conduit are field supplied for this
application. Reference the chart with Figure 17 for
proper hole and conduit size.
NOTES:
1 Wire size based on 60°C rated wire insulation and 30°C
Ambient Temp. (86°F).
2 For more than 3 conductors in a raceway or cable, see the
N.E.C. for derating the ampacity of each conductor.
When installed, the unit must be electrically grounded in
accordance with local codes or, in the absence of local
codes, with the National Electrical Code, ANSI/NFPA 70, if
an external electrical source is utilized.
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.
14
4
3
3
2
2
4
4
4
3
3
6
6
6
4
4
10
8
8
6
6
30
35
40
45 50
Figure 16: Recommended Branch Circuit Disconnect
Location
BRANCH
CIRCUIT
DISCONNECT
Hook-Up
To wire unit, refer to the following hook-up diagram.
Refer to Figures 3 and 17 for location of wiring entrances.
Wiring to be done in the field between the unit and devices not
attached to the unit, or between separate devices which are
field installed and located, shall conform with the temperature
limitation for Type T wire [63°F rise (35°C)] when installed in
accordance with the manufacturer's instructions.
Internal Wiring
IMPORTANT: Some single phase units are equipped with a
single pole contactor. Caution must be exercised when servicing
as only one leg of the power supply is broken with the contactor.
A diagram of the internal wiring of this unit is located under
the electrical box cover and this manual. If any of the original
wire as supplied with the unit must be replaced, the wire
gauge and insulation must be same as original wiring.
Transformer is factory wired for 230 volts on 208/230 volt
models and must be changed for 208 volt applications. See
unit wiring diagram for 208 volt wiring.
TO POWER
TO THERMOSTAT
I317A
IM 861
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