Installation manual

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 requirements that might apply.
Check the rating plate on the heater for the supply voltage and current require-
ments. A dedicated line voltage supply with disconnect switch should be run
directly from the main electrical panel to the heater. All external wiring 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 dis-
connect switch (20A @ 115V; 10A @ 230V Rating) is included. Supply wiring con-
nects to leads located inside a sealed electrical box. To maintain the sealing fea-
ture 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.
8.0 Electrical and
Wiring
CAUTION: Route wires
so that they do not
contact the ue wrapper
or venter housing.
CAUTION: If any of
the original wire as
supplied 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










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 outside of the
cabinet at the back of the heater (See FIGURE 24). Wires from the terminal strip
are factory wired to the circuit board.
Use either an optional thermostat available with the heater or a eld-supplied
24-volt thermostat. Install according to the thermostat manufacturer’s instructions,
paying particular attention to the requirements regarding the location of the ther-
mostat.
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 W1
W2
Form I-UEAS, Page 28