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OPERATING INSTRUCTIONS
Wiring
WARNING
This water heater uses an external electrical source
for power. It must be electrically grounded in accor-
dance with all local codes or, in the absence of local
codes, CSA C22.1 Canadian Electrical Code, in
Canada and/or the National Electrical Code, ANSI/
NFPA 70, in the United States. Failure to properly
ground this water heater can result in property dam-
age, personal injury, or death.
Wiring Diagram
for Models UG40, UG50, UG60
Figure 16
Blower Unit
High Limit Switch
Vacuum Switch (N.O.)
M
Red
5
5
Yellow
3
3
4
4
1
1
2
2
6
6
Blue
White
Green
Black
Black
White
Green
Power Cord
16
Before lighting your water heater, check that all of the
wires have been installed correctly (see Figure 16).
Make sure that none of the wires are grounded, have
split or are broken. Verify that all wiring connections are
properly secured, as there is a possibility that they have
become loose during transportation. If any of the origi-
nal wiring needs replacing, use only 18AWG-type or
greater wire that is approved for 221
High Limit Switch
(Access Door)
Red
Yellow
Blue
White
Black
Green
Hot Surface Igniter
Flame Sensor
Flammable Vapor Sensor
o
F (105
o
C).
Gas Control
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