State Water Heaters SBD100199*, Manual

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6
OF INCREASED LEVELS OF CARBON MONOXIDE GAS
IN EXCESS OF SAFE LIMITS WHICH COULD RESULT IN
SERIOUS PERSONAL INJURY OR DEATH.
You should contact your gas supplier for any specific changes
which may be required in your area.
As elevation above sea level is increased, there is less
oxygen per cubic foot of air. Therefore, the heater input
rate should be reduced at high altitudes for satisfactory
operation with the reduced oxygen supply. Failure to make
this reduction would result in an overfiring of the heater
causing sooting, poor combustion and/or unsatisfactory
heater performance.
Ratings specified by manufacturers for most appliances
apply for elevations up to 2000 feet (610m). For elevations
above 2000 feet (610), ratings must be reduced at the rate of
4% for each 1000 feet (305m) above sea level. For example,
if a heater is rated at 120,000 Btuh (35 kWh) at sea level,
to rate the heater at 4000 feet (1219m), you subtract 4
(once for each thousand feet) x .04 (4% input reduction) x
120,000 (original rating) from the original rating. Therefore,
to calculate the input rating at 4,000 feet (121.9m): 4 x
.04 x 120,000 =19,200 Btuh (5.6 kWh), 120,000 (35 kWh)
- 19,200 (5.6 kWh) = 100,800 Btuh (29.4 kWh). At 6000
feet (1829m) the correct input rating should be 91,200 Btuh
(26.7 kWh).
The input reduction is primarily achieved by reducing the size
of the main burner orifices. To do this, the main burner orifices
require replacement with orifices sized for the particular installation
elevation. Correct orifice sizing and parts may be obtained from
State Water Heaters. When ordering, be sure to state the model
number and the altitude of the location where the water heater
is being installed.
Upon completion of derating of the heater, adjustment to the
gas pressure regulator may be required. See CHECKING THE
INPUT section in this manual for inlet and manifold pressure
requirements.
Also due to the input rating reduction required at high altitudes,
the output rating of the appliance is reduced and should be
compensated for in the sizing of the equipment for application.
FEATURES
SELF-CLEANING HYDRO CANNON
These units include a self-cleaning hydro cannon installed
in the front water inlet. See figure 2. The hydro cannon
must be oriented correctly for proper function. There is a
marked range on the pipe nipple portion of the hydro cannon,
that must be aligned with the top of the inlet spud. A label
above the jacket hole has an arrow that will point to the
marked portion of the pipe nipple if the orientation is correct.
If the arrow does not point within the marked range on the
pipe nipple, adjust the pipe nipple to correct. A pipe union is
supplied with the hydro cannon to reduce the probability of
misaligning the hydro cannon accidentally while tightening the
connection to the inlet water supply line. Improper orientation
of the hydro-canon can cause poor performance of the heater
and can significantly reduce outlet water temperatures during
heavy draws.
NOTE: The inlet tube may have 1, 3 or 7 cross-tubes.
FIGURE 2
For proper function, the hydro cannon must be oriented correctly.
There is a marked range on the pipe nipple that must be aligned
with the top of the inlet spud (check for label on the appliance) to
assure proper orientation. Please check to confirm that the marked
range is in alignment with the top of the spud. A pipe union is
supplied with the hydro cannon to help eliminate the possibility of
changing the orientation by accidentally over-tightening the inlet
supply line. Improper orientation of the hydro cannon may cause
temperature build-up issues or spells of colder than usual water
temperatures.
HIGH LIMIT SWITCH
The digital thermostat (Fig. 3) contains the high limit (energy cutoff)
sensor. The high limit switch interrupts main burner gas flow should
the water temperature reach 203°F (95°C).
In the event of high limit switch operation, the appliance cannot be
restarted unless the water temperature is reduced to approximately
120°F (49°C). The high limit reset button on the front of the control
then needs to be depressed.
Continued manual resetting of high limit control, preceded by
higher than usual water temperature is evidence of high limit
switch operation. The following is a possible reason for high limit
switch operation:
• A malfunction in the thermostatic controls would allow the gas
valve to remain open causing water temperature to exceed the
thermostat setting. The water temperature would continue to
rise until high limit switch operation.
Contact your dealer or service agent if continued high limit switch
operation occurs.
DIGITAL THERMOSTAT
FIGURE 3