Section Iii: General Information - Bradford White UCG100H199 Installation & Operation Manual

SECTION III: GENERAL INFORMATION

This water heater contains the following features:
Main Power On/Off Switch
The front panel of this water heater has an ON/OFF switch, which has markings when the main power is turned on to
indicate power to the water heater.
Combustion System
This water heater is equipped with a self-compensating negative pressure pre-mix combustion system. As the blower
operates, air is drawn in through the air intake and into a venturi, which pulls gas from the gas valve. The gas and air are
then mixed in the combustion blower and sent through the transition tube into the burner. The Direct Spark Ignition (DSI)
System then ignites the gas/air fuel mixture to produce flue products (combustion). The flame sensor signals the ignition
control board (described below) that a flame is present.
ICON Systems Control
The ICON Systems Control consists of a control board and a digital water heater display. The digital water heater display
is on the top front of the water heater for setting and displaying the temperature setpoint and monitoring the status of the
water heater. Pressing the temperature UP and DOWN buttons changes the temperature setpoint. The temperature
format may be displayed in degrees F or degrees C. The water heater display will show service codes in the event the
water heater needs servicing. The temperature readings of the tank sensor can be monitored in Service Mode. The
display can show up to 10 previous error codes in Service Mode to further aid in servicing the water heater.
The single control board has plug in wiring harnesses to reduce the chance of mis-wiring. The control board controls all
ignition, temperature, and combustion blower functions. The control board controls the combustion blower, ignition
timings, and gas valve to control the combustion system in order to maintain the desired tank temperature. The sequence
of operation is described in detail in the Service section at the back of this Installation and Operating Instruction Manual.
Adjustable Thermostat
This water heater is equipped with an adjustable thermostat as part of the ICON Systems Control to control water
temperature. Hot water temperatures required for automatic dishwasher and laundry use can cause scald burns, resulting
in serious personal injury and/or death.
The temperature may be adjusted from about 70°F (21°C) to about 180°F (82°C). The thermostat was adjusted to 70°F
(21°C) before the water heater was shipped from the factory. It is recommended that lower temperatures be used to avoid
the risk of scalding. Refer to the scald warnings and the section on scalding in Section V: Water Connections. It is further
recommended, in all cases, that the water temperature be set for the lowest temperature that satisfies your hot water
requirements for the installation. This will also provide the most energy efficient operation of the water heater and
minimizes scale formation. Setting the water heater temperature at 120°F (49°C) will reduce the risk of scalds. Some
states require setting lower temperatures for specific installations.
The top immersion well of the single sensor control also contains a redundant sensor for the high limit (energy cutoff). The
high limit circuit interrupts the main burner gas flow should the water temperature exceed approximately 207°F (97.2°C).
Error code "80" will be shown on the water heater control display if the high limit temperature has been exceeded. Should
the high limit switch activate, it must be manually reset. This should only be done by a service technician after the cause
of overheating has been corrected. Refer to the section on "Accessing Service Mode on the Display" in the Service
section of this Installation and Operation Manual. Contact your qualified installing contractor, service provider or
manufacturer listed on the rating plate if continued high limit operation occurs.
Latches
The latches allow easy access for servicing the water heater from the top. Remove the two latches for servicing and re-
latch upon completion. No tools are required to obtain access to the top of the water heater. Replace the surround and re-
latch when the service has been completed.
Dishwashing Machine Requirements
All dishwashing machines meeting the National Sanitation Foundation requirements are designed to operate with water
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flow pressures between 15 and 25 lbs/in . Flow pressures above 25 lbs/in or below 15 lbs/in will result in improperly
sanitized dishes.
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 valve in the circulation line.
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