All electrical wiring and connections, including electrical grounding MUST
be made in accordance with the National Electric Code ANSI/NFPA No. 70
(latest edition) or, in Canada, with CSA Standard C22.1. In addition, the
installer should be aware of any local ordinances or gas company require-
ments that might apply.
Check the rating plate on the heater for the supply voltage and current
requirements. A dedicated line voltage supply with disconnect switch should
be run directly from the main electrical panel to the heater. All external wir
-
ing must be within approved conduit and have a minimum temperature rise
rating of 60°C
.
Conduit must be run so as not to interfere with the heater
access panel. If the installation requires a stepdown transformer (Option
CG), follow the instructions shipped with the option package for attaching
the transformer to the heater.
The electrical supply enters at the rear of the heater (
FIGURE 24
). A built-in
disconnect switch (20A @ 115V; 10A @ 230V Rating) is included. Supply
wiring connects to leads located inside a sealed electrical box. To maintain
the sealing feature of the electrical box, always replace the cover plate.
The circuit board (See
FIGURE 23
) is located inside on the bottom of the
control compartment. The circuit board is polarity sensitive. It is advisable
to check the electrical supply to be certain that the black wire is the “hot”
wire and that the white wire is the neutral wire. The supply connection
made to “L1” on the circuit board must be the “hot” wire.
8. Electrical and
Wiring
CAUTION: Route
wires so that they do
not contact the flue
wrapper or venter
housing.
CAUTION: If any of the
original wire as sup-
plied with the appliance
must be replaced, it
must be replaced with
wiring material having
a temperature rating of
at least 105°C, except
for limit control, vent
temperature limit, and
sensor lead wires which
must be 150°C. See
Hazard Levels, page 2.
FIGURE 23 - Supply
Wiring Connections at
the Circuit Board (DSI
Integrated Control
Module)
Supply
Wiring
Connections
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NOTE:
Circuit
board is polarity
sensitive; “hot”
wire MUST BE
connected to
Terminal L1.
8.1 Electrical Supply
The terminal strip for 24 volt thermostat connection is located on the out-
side of the cabinet at the back of the heater (See
FIGURE 24
). Wires from
the terminal strip are factory wired to the circuit board.
8.2 24V
Control Wiring
Connections
FIGURE 24 -
Terminal Strip
for 24-volt
Wiring is on
the Outside
Rear of the
Heater
Rear View
Model UEAS
Condensate Drain
Line Voltage
Entrance
Gas Connection
Terminal Strip for
Thermostat
Connection
R G W1W2
Form I-UEAS, Page 30
