Unit installation

29
NOTE: When damper motor is energized, a small delay due to
drive mechanism backlash occurs before a visual position change
to the damper blade or shaft is noted. DO NOT FORCE, IMPEDE
OR OTHERWISE ALTER OR BEND THE DRAFT HOOD
ASSEMBLY OR DAMPER DRIVE MECHANISM OR MOTOR.
— During the motor operation the mechanically operated switch
S
1
changes operating position and returns to the position noted
in fig. 18.
— The “OPENING” of the R
3
contacts acts to de-energize the
ignition module circuit and shut off main burner and pilot
gases.
— Main burner and pilot burner remain “off” until next “call for
heat”. Appliance is in “standby” mode.
— Flue damper remains in “closed” position until next “call for
heat”.
— In the event of power failure or power interruption (servicing)
the flue damper spring will function to “open” the damper. The
damper will remain in the “open” position until power is restored.
If Power Restored/No Call For Heat:
— The flue damper motor will again operate to “close” the damper.
The appliance will remain in the “standby” mode.
If Power Restored/Call For Heat:
— The damper mechanism is already in the position noted in fig.
19. The damper remains “opened” and the appliance ignition
system is immediately energized.
WATER TEMPERATURE CONTROL
DANGER
THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE
THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT
WATER TEMPERATURES REQUIRED FOR AUTOMATIC
DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD
BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/
OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS
VARIES WITH THE PERSON'S AGE AND TIME OF EXPOSURE.
THE SLOWER RESPONSE TIME OF DISABLED PERSONS
INCREASES THE HAZARDS TO THEM. NEVER ALLOW SMALL
CHILDREN TO USE A HOT WATER TAP, OR TO DRAW THEIR
OWN BATH WATER. NEVER LEAVE A CHILD OR DISABLED
PERSON UNATTENDED IN A BATHTUB OR SHOWER.
THE WATER HEATER SHOULD BE LOCATED IN AN AREA
WHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS
TO SET TEMPERATURES.
SETTING THE WATER HEATER TEMPERATURE AT 120°F WILL
REDUCE THE RISK OF SCALDS. Some states or provinces
require settings at specific lower temperatures.
Below you will find listed the approximate time-to-burn
relationship for normal adult skin. Short repeated heating cycles
caused by small hot water uses can cause temperatures at the
point of use to exceed the thermostat setting by up to 20°F (11°C).
If you experience this type of use, you should consider using
lower temperature settings to reduce scald hazards.
180°F (82°C) Nearly instantaneous
170°F (77°C) Nearly instantaneous
160°F (71°C) About 1/2 second
150°F (65°C) About 1-1/2 seconds
140°F (60°C) Less than 5 seconds
130°F (54°C) About 30 seconds
120°F (49°C) More than 5 minutes
Valves for reducing point-of-use temperature by mixing cold and
hot water are available. Also available are inexpensive devices
that attach to faucets to limit hot water temperatures.
Contact a
licensed plumber or the local plumbing authority.
The water temperature is controlled by a thermostat, fig. 2, which
has two sensing elements. One sensor is located near the top of
the tank and the other is near the center. The thermostat is set in
the lowest position before the heater leaves the factory.
The thermostat temperature dial, fig. 2, is accessible by removing
the control cover. The dial is adjustable and may be set for 120
0
(49°C) to 180
0
F (82°C) water temperature, but 120
0
F (49°C) is
the recommended starting point. It is suggested the dial be placed
on the lowest setting which produces an acceptable hot water
supply. This will always give the most energy efficient operation.
The temperature control has a 4
0
F fixed differential.
PREVENTIVE MAINTENANCE
CHECK THE PILOT
At least once a year, check the pilot burner, fig. 20, and the main
burner, fig. 21, for proper operation. Refer to the following pilot
and main burner sections.
PILOT BURNER
For access to pilot, unfasten two screws to burner cover and
remove. Locate the burner with pilot and remove screw holding
burner to manifold. Unfasten pilot tubing from valve and slide out
burner and pilot.
Servicing of the pilot burner includes keeping pilot free of lint,
cleaning the burner head, the primary air opening and the orifice
of the pilot burner.
Pilot burner flame is affected by:
1. Low gas pressure.
• Adjust pilot flame by means of the pilot gas adjustment
located on the gas valve. See fig. 22.
Temperature Time to Produce 2nd & 3rd
Setting Degree Burns on Adult Skin