23
A. Do turn off manual gas shut-off valve if water heater
has been subjected to over heating, fire, flood, physi-
cal damage or if gas supply fails to shut off.
B.. DO NOT turn on water heater unless it is filled with
water.
C. DO NOT turn on water heater if cold water supply
shut-off valve is closed.
D. DO NOT store or use gasoline or other flammable
vapors and liquids, such as adhesives or paint thin-
ner, in vicinity of this or any other appliance. If such
flammables must be used, open doors and windows
for ventilation, and all gas burning appliances in vicin-
ity should be shut off, including their pilot lights, to
avoid vapors igniting.
NOTICE: Flammable vapors may be drawn by air
currents from surrounding areas to the water heater.
E. DO NOT allow combustible materials such as news-
paper, rags or mops to accumulate near water heater.
F. If there is any difficulty in understanding or following
the OPERATION or MAINTENANCE instructions, it is
recommended that a qualified person or serviceman
perform the work.
Hydrogen gas can be produced in a hot water system
served by this water heater that has not been used for
a long period of time (generally two weeks or more).
HYDROGEN GAS IS EXTREMELY FLAMMABLE!! To
dissipate such gas and to reduce risk of injury, it is
recommended that the hot water faucet be opened for
several minutes at the kitchen sink before using any
electrical appliance connected to the hot water sys-
tem. If hydrogen is present, there will probably be an
unusual sound such as air escaping through the pipe
as the water begins to flow. DO NOT smoke or use an
open flame near the faucet at the time it is open.
SAFETY PRECAUTIONS
CAUTION
!
1. TEMPERATURE SETTINGS — The temperature is
adjusted to 120° F when shipped from the factory.
To meet commercial water use needs, it is adjust-
able up to 180°F (82°C). However, water tempera-
tures over 125°F (52°C) can cause severe burns
instantly or death from scalds. This is the preferred
starting point for setting the control for supplying
general purpose hot water.
Safety and energy conservation are factors to be
considered when setting the water temperature.
The most energy efficient operation will result
when the temperature setting is the lowest that
satisfies the needs consistent with the application.
Hotter water increases the Potential for Hot Water SCALDS.
When this water heater is supplying general purpose hot
water requirements for individuals, a thermostatically con-
trolled mixing valve for reducing point of use water tempera-
ture is recommended. Contact a licensed plumber or the local
plumbing authority for further information.
Outlet water temperature will vary during normal
operating cycles. Reliable temperature readings
should be taken shortly after main burner cycles
off during a period of little or no use.
2 CHECKINPUT — Consult the local Gas Company
to determine the heating value of the gas supplied.
Check input by clocking gas meter with all other
gas appliances turned off. Use the following for-
mula:
DO NOT exceed Input shown on the water heater's rating plate! To
insure accuracy for rating, clock enough cubic feet of gas so that
the clocked time is at least 60 seconds.
DO NOT exceed Input shown on the water heater's rating
plate!
3. EMERGENCY SHUTDOWN —
Should overheating occur or the gas supply fail to shut off,
turn off the manual gas control valve to the appliance.
NOTICE: DO NOT use this appliance if any part has
been under water. Immediately call a qualified in-
staller or service agency to replace a flooded water
heater. DO NOT attempt to repair the unit! It must
be replaced.
Adjusting the Controls
Following adjustment of the setpoint to a higher
temperature (see Figure 21), the main burner
should relight. Next, adjust the setpoint to a lower
temperature (i.e. back to 120°F) and the gas valve
will close, extinguishing the burner flame. The
temperature should be adjusted to the minimum
setting that will meet the hot watet needs of the
application.
There is a scald potential if the thermostat is set
too high. The recommended temperature set-
ting for normal residential use is 120°F. If higher
temperature settings are needed for combined
appliance applications or commercial use, an au-
tomatic tempering valve must be installed on all
domestic hot water lines
MEASURING THE POINT-OF-USE WATER TEMPERATURE
The thermostat is factory set at 120°F for domestic
use. It is the responsibility of the building owner to
verify that the installer follows the recommended
quantitative testing for measuring the point-of-use
water temperature. To make sure that the system
INPUT (btu/h) =
(3,600) x (Heating Value) x
(Number of Cubic Feet Timed)
Seconds Clocked
DANGER
!
WA RNING
!
WA RNING
!
WA RNING
!
Operation
CAUTION
!
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