John Wood Commercial Atmospheric Vent - AJWSM - Manual (Page 6)

6
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
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.
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 current edition of
the National Electrical Code NFPA 70.
Only all bronze circulating pump should be used with commercial
water heaters.
Although circulators are oiled and operated by the manufacturer
some circulating pump must be oiled again before operating.
Please refer to manufacturer’s instructions.
DISHWASHING MACHINE REQUIREMENT
These appliances meet the NSF Standard 5 for sanitary
installations when used with leg kit, Part No. 9003425205.
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 f low regulating control valve
should be used in 180°F (82°C) line to the dishwashing
machine, and should be adjusted to deliver water between
these limits.
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