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Water Heater Operation
Figure 46 shows the water heater's sequence
of operation when a call for heat is initiated. The
ignition control module will attempt to light the
burner three times. If the ignition control does not
detect ignition it will enter lockout mode and flash
the corresponding error code.
HEATER CONTROL
CHECKS TO ENSURE
BLOWER PRESSURE
SWITCH IS OPEN
BLOWER IS J
ENERGIZED
CONTROL CHECKS
TO ENSURE PRES-
SURE SWITCH CLOSES
INDICATING BLOWER
IS OPERATING AND
THERE ARE NO
VENTING BLOCKAGES
(INLET OR OUTLET)
IGNITER IS ENERGIZED
AND MAIN GAS VALVE
IS OPENED
MAIN BURNER COMES
ON AND THE FLAME IS
SENSED BY CONTROL
MAIN BURNER CONTIN-
UES TILL THE WATER
IN THE TANK REACHES
THERMOSTAT SETTING
MAIN BURNER SHUTS
OFF. BLOWER
CONTINUES FORA
POST PURGE TIME
Figure 46
Temperature Regulation
It is recommended that lower water temperatures
be used to avoid the risk of scalding. It is further
recommended, in all cases, that the water
temperature be set for the lowest temperature
which satisfies your hot-water needs. This will also
provide the most energy efficient operation of the
water heater. Short repeated heating cycles caused
by small hot-water uses can cause a temperature
increase of the hot water by 20F ° (11C °) higher
than the heater's temperature settings. If you
experience this type of use you should consider
using lower temperature settings to reduce scald
hazards. Should overheating occur or the gas
supply fails to shut off, turn off the main manual gas
shut off valve to the appliance (see Figure 1)
Water temperature over
125°F (52°C) can cause
severe burns instantly
resulting in severe injury or
death.
Children, the elderly and the
disabled and are at highest
risk of scald injury.
Feel water before bathing or
showering.
Temperature limiting devices
such as mixing valves must
be installed when required
by codes and to ensure safe
temperatures at fixtures.
Read instruction manual for
safe temperature setting.
HOT WATER CAN SCALD:
Water heaters are intended to produce hot water.
Water heated to a temperature which will satisfy
space heating, clothes washing, dish washing, and
other sanitizing needs can scald and permanently
injure you upon contact. Some people are more
likely to be permanently injured by hot water than
others. These include the elderly, children, the
infirm or physically/mentally handicapped. If anyone
using hot water from this heater fits into one of
these groups or if there is a local code or state law
requiring certain temperature water at the hot-water
tap, then you must take special precautions. In
addition to using the lowest possible temperature
setting that satisfies your hot-water needs, a means
such as a mixing valve should be used at the hot-
water taps used by these people or at the water
heater. Mixing valves are available at plumbing
supply or hardware stores (see Figure 39 and 40).
Follow manufacturer's instructions for installation of
the valves. Before changing the factory setting on
the thermostat, in this manual, see Table 4.
The water heater should be located in an area
where the general public does not have access. If
a suitable area is not available, a cover should be
installed over the thermostat to prevent tampering.
This water heater is equipped with an adjustable
thermostat to control water temperature (see Figure
47). Hot water temperatures required for automatic
46
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