21
5. ELECTRICAL WIRING
NOTE:
If it is necessary to replace any of the original
wiring, use 105°C wire or its equivalent, and/or 150°C
wire or its equivalent, like the original wiring.
A
A
WARNING:
Digital heaters are factory-wired for
240 VAC, 1Ph, 60Hz power supply. DO NOT attempt to
operate at 208 VAC.
The standard field-wiring connection is on the right side of
the heater.
To wire the heater from the left side, follow these steps:
1. Remove the two (2) screws that hold the front door
to the heater. Remove and set aside door for better
access to wiring.
2.
Remove the four (4) screws that hold down the
junction box to the sway brace.
3. Remove the transformer cover located on the far
right by removing one (1) screw.
4.
Remove the two (2) screws that hold down the
transformer.
5.
Remove the one (1) screw that holds down the
ground wires.
6.
Disconnect P6 connector from PC board.
7. Remove transformer from its current location and
relocate it on the far left side of the heater.
8. Re-route all high-voltage wires and ground wires
through the left jacket side of heater.
9.
Re-install P6 connector, ground wires (SPG),
transformer, junction box, front door, and plug right
side with the left side’s grommet plug.
NOTE:
7/8" diameter holes not utilized on jacket and
control box can be used for fireman switch, auxiliary
control interface or power vent (D-2) wiring.
Electrical Power Draw
A
A
CAUTION:
Heater must be electrically grounded and
bonded. Bonding lug is provided loose with the heater.
Install bonding lug on lower right or left side of jacket
as necessary for bonding the heater. Mounting hole is
provided on the jacket.
NOTE:
Failure to ground the heater electrically could
affect the heater’s electronics.
NOTE:
See "Time Clock/Fireman’s Switch" on page 30
for further instructions if using a time clock/fireman’s
switch.
The Electronic Intermittent Ignition Device automatically
lights the pilot and main burners upon a call for heat. The
heater is supplied with a dual-voltage transformer for 120
VAC or 240 VAC input power hookup.
When operating on 120VAC power, units draw 6 amps.
When operating on 240VAC units draw 3 amps.
OPTION LOCATION
LEFT SIDE FIELD WIRING
CONTROL BOX
(FACTORY MOUNTED
LOCATION)
SWAY BRACE
BONDING LUG
(STANDARD
LOCATION)
BONDING LUG
(OPTIONAL
LOCATION)
F10651
Figure 32. Heater Wiring Locations
Transformer Wiring
120 VAC Wiring
For 120 VAC input power to the unit, connect the black
wire to the “L1” or hot leg of the power supply. Connect the
white wire to the “Ret” or neutral leg of the power supply.
There should be no connection to the red wires for
120 VAC operation.
Attach a wire nut to each red wire
independently.
SUPPLY
SIDE
RETURN
or
NEUTRAL
HEATER
7 WIRES
L1
HOT
RED
RED
BLACK
BLACK
BLACK
GREEN
GREEN
WHITE
WHITE
WHITE
GROUND
Figure 33. 120 VAC Wire Connection Models
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