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2. TEMPERATURE SETTINGS — The thermostat is adjusted to its lowest
temperature position when shipped from the factory. To meet com-
mercial water use needs, it is adjustable up to 180°F (82°C). How-
ever, water temperatures 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 on the thermostat. The most energy ef-
ficient 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 controlled mixing
valve for reducing point of use water temperature is recommend-
ed. Contact a licensed plumber or the local plumbing authority for
further information.
Outlet water temperature will vary during normal operating cycles. Reli-
able temperature readings should be taken shortly after main burner
cycles off during a period of little or no use.
3. GAS MANIFOLD PRESSURE — With the gas valve supplied with this
water heater, main burner ignition occurs at a low or step manifold
pressure, which will then automatically build up to its normal operat-
ing level . The rated operating manifold pressure is listed on the water
heater rating plate. For purposes of input adjustment, the minimum inlet
gas pressure(with main burner on) is also shown on the rating plate.
A 1/8” NPT tapping is provided on the outlet side of the gas valve for
connecting a manometer to check this pressure. If necessary, adjust
the pressure to the proper value by turning regulator adjustment screw
clockwise to increase pressure or counterclockwise to decrease pres-
sure.
4. CHECK INPUT — 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 formula:
DO NOT exceed Input shown on the water heater's rating plate!
16
Operation
A. Do turn off manual gas shut-off valve if water heater has been sub-
jected to over heating, fire, flood, physical 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 thinner, in vicinity of this or any other
appliance. If such flammables must be used, open doors and win-
dows for ventilation, and all gas burning appliances in vicinity should
be shut off, including their pilot lights, to avoid vapors igniting.
NOTICE: Flammable vapors may be drawn by air currents from sur-
rounding areas to the water heater.
E. Do not allow combustible materials such as newspaper, rags or
mops to accumulate near water heater.
F. If there is any difficulty in understanding or following the OPERA-
TION 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 system. 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
!
INPUT (btu/h) =
(3,600) x (Heating Value) x (Number of Cubic Feet Timed)
Seconds Clocked
DANGER
!
Figure 11. — Thermostat adjustment
WARNING
!
WARNING
!
12
0
140
°
F
1
8
0
1
6
0
1
4
0
1
3
0
1
2
0
1
1
0
1
0
0
THERMOSTAT
°
C
8
0
7
0
6
0
5
0
4
0
To adjust the water temperature, insert a small straight
screwdriver into slotted screw in hole in front of ther-
mostat and turn wheel to desired setting. Thermostat
is adjustable up to 180º F.
CAUTION!! - Hotter water increases the risk of SCALDING!
White-Rodgers
Honeywell