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.
FIGURE 3 - DIGITAL THERMOSTAT
ELECTRONIC IGNITION CONTROL
Each heater is equipped with a ignition module. The solid state ignition control (Figure 4), ignites the main burner by utilizing a silicone nitride ignitor. The silicone nitride ignitor shuts off during the heating cycle and the main burner flame is sensed through a remote flame sensor integral to the silicone nitride ignitor assembly. The ignition control will try to ignite the main burner three times before lockout. Then it waits one hour before trying again to ignite the main burners. This is a continuous cycle.
FIGURE 4 - IGNITION CONTROL BOARD
EXHAUST INDUCER (BLOWER ASSEMBLY)
All units are equipped with a exhaust inducer. The inducer assists in drawing in fresh air to the unit for combustion and then assists in dispensing the combustion
The exhaust inducer is equipped with a gravity controlled damper to reduce the amount of heat loss through the flue, improving efficiency.
FIGURE 5 - EXHAUST INDUCER
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 at rear of manual for electrical hookup information and install in accordance with the latest version of the National Electric Code ANSI/NFPA No. 70.
Only all bronze circulators are 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.
All dishwashing machines meeting the National Sanitation Foundation requirements are designed to operate with water flow pressures between 15 and 25 psi. Flow pressures above 25 psi, or below 15 psi, will result in improperly sanitized dishes. Where pressures are high, a water pressure reducing or flow 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.
The National Sanitation Foundation also recommends circulation of 1800F water. Where this is done, the circulation should be very gentle so that it does not cause any unnecessary turbulence inside the water heater. The circulation should be just enough to provide 1800F water at the point of
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