High Limit Switch (E.c.o.); Dishwashing Machine Requirement; Circulating Pump; Installation Instructions - State Water Heaters Ultra Forcce SUF 60 120 Installation & Operation Manual

SETTING THE WATER HEATER TEMPERATURE AT 120°F/49°C WILL REDUCE
THE RISK OF SCALDS. Some states require settings at specific lower
temperatures.
Figure 1 shows the approximate time-to-burn relationship for normal adult
skin. Short repeated heating cycles caused by small hot water uses can
cause temperatures at the point of use to exceed the thermostat setting by
up to 20°F/11°C. If you experience this type of use, you should consider
using lower temperature settings to reduce scald hazards.
Temperature
Setting
180°F / 82°C
170°F / 77°C
160°F / 71°C
150°F / 66°C
140°F / 60°C
130°F / 54°C
120°F / 49°C
Valves for reducing point-of-use temperature by mixing cold and hot water
are available (see Figure 2). Also available are inexpensive devices that
attach to faucets to limit hot water temperatures. Contact a licensed plumber
or the local plumbing authority.

HIGH LIMIT SWITCH (E.C.O.)

The top immersion well of the dual bulb controller also contains the high limit
(energy cutoff) sensor. The high limit switch interrupts the main burner
gas flow should the water temperature reach approximately 202°F/94°C.
Should the high limit switch activate, it must be manually reset by depressing
the Temperature Adjustment Button/Reset Button on the display board. The
water temperature must drop below 160°F/71°C before the controller can
be reset.
Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
Nearly instantaneous
Nearly instantaneous
About 1/2 second
About 1-1/2 seconds
Less than 5 seconds
About 30 seconds
More than 5 minutes
FIGURE 1
FIGURE 2
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.

DISHWASHING MACHINE REQUIREMENT

All dishwashing machines meeting the National Sanitation Foundation
requirements are designed to operate with water flow pressures between
15 and 25 pounds per square inch (103 kPa and 173 kPa). Flow pressures
above 25 pounds per square inch (173 kPa), or below 15 pounds per
square inch (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 the 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
180°F (82°C) 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
180°F (82°C) water at the point of take-off to the dishwashing machine.
Adjust flow by means of the plug cock in the circulating line. (See
installation diagrams.)

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 NFPA 70.
All bronze circulators are recommended for used with commercial
water heaters.
Although circulators are oiled and operated by the manufacturer some
circulators must be oiled again before operated. Please refer to
manufacturer's instructions.

INSTALLATION INSTRUCTIONS

REQUIRED ABILITY

INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES
ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE
FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY
AND ELECTRICAL WORK ARE REQUIRED.

INSULATION BLANKETS

Insulation blankets available to the general public for external use on
gas water heaters are not approved for use on your State water
heater. The purpose of an insulation blanket is to reduce the standby
heat loss encountered with storage tank water heaters. Your State
water heater meets or exceeds the ASHRAE/IES 90.1 1999 standards
with respect to insulation and standby loss requirements, making an
insulation blanket unnecessary.
Should you choose to apply an insulation blanket to this heater, you
should follow these instructions. Failure to follow these instructions
can result in fire, asphyxiation, serious personal injury or death.
• Do not apply insulation to the top, or the upper 15" (38 cm) of the water
heater, as this will interfere with safe operation.
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WARNING