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7
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 servicer if continued high limit switch
operation occurs.
DUAL-BULB THERMOSTAT
(COVER REMOVED)
FIGURE 3
Continued pilot outage preceded by higher than usual water
temperature is evidence of high limit switch operation. Contact
your dealer or servicer to determine the reason for operation.
ELECTRONIC IGNITION CONTROL
Each heater is equipped with a Honeywell ignition module. The
solid state ignition control, fig.4, ignites the pilot burner gas by
creating a spark at the pilot assembly. Pilot gas is ignited and
burns during each running cycle. The main burner and pilot
gases are cut off during the OFF cycle. Pilot gas ignition is
proven by the pilot sensor. Main burner ignition will not occur if
the pilot sensor does not first sense pilot ignition.
HONEYWELL IGNITION MODULE
S8600M Continuous Re-Try
FIGURE 4
AUTOMATIC FLUE DAMPER DEVICE
All units are equipped with an automatic flue damper that reduces
heat loss during the OFF cycles. The automatic flue damper
drive assembly is a field replaceable part and may be obtained
by contacting A. O. Smith Water Products Company, Product
Service Division, 5621 W. 115th Street, Alsip, IL 60803, 1-800-
433-2545, Canada, contact A.O. Smith Enterprises LTD., P.O.
Box, 310 - 768 Erie Street, Stratford, Ontario, Canada N5A 6T3,
1-800-265-8520.
Each automatic flue damper drive assembly is equipped with a
“Service Switch”, as shown in figure 5.
FIGURE 5
The “Service Switch” has 2 positions: AUTOMATIC OPERATION
and HOLD OPEN DAMPER. For normal operation the switch
should be in the AUTOMATIC OPERATION position.
If there is a problem with the damper the “Service Switch” can be
placed in the HOLD OPEN DAMPER position. When the switch
is placed in the HOLD OPEN DAMPER position the damper disc
will rotate to the open position and the heater may be used until
vent assembly is repaired or replaced. DO NOT turn the damper
disc manually; damage will occur to the drive assembly if operated
manually. Refer to TESTING DAMPER OPERATION section of
this manual for additional information.
CIRCULATING PUMP
A circulating pump is used when a system requires a circulating
loop or there is a storage tank used in conjunction with the
heater. Refer to the piping diagrams in this manual for electrical
hookup information and install in accordance with the latest
version of the National Electric Code ANSI/NFPA No. 70. For
Canada refer to Canadian Code CSA C22.1.
Only all bronze circulators should be used with commercial water
heaters.
Although circulators are oiled and operated by the manufacturer
some circulators must be oiled again before operating. Please
refer to manufacturer’s instructions.
DISHWASHING MACHINE REQUIREMENT
These appliances meet the National Sanitation Foundation
Standard for sanitary installations when used with the following
leg kits, Part No’s. 6570-0 and 6570-7.
All dishwashing machines meeting the National Sanitation
Foundation requirements are designed to operate with water
flow pressures between 15 and 25 psi (103 kPa and 173 kPa).
Flow pressures above 25 psi (173 kPa), or below 15 psi (103
kPa), will result in improperly sanitized dishes. Where pressures
are high, a water pressure reducing or flow regulating control
valve should be used in 180
0
F (82°C) line to the dishwashing
machine, and should be adjusted to deliver water between these
limits.
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