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Installation & Operation Manual
69
8 Domestic water heaters (continued)
Failure to press the ENTER key after changing the display
value will result in the set point reverting back to its
previous value after the current heat demand ends.
The control may be adjusted any time regardless of call for
heat status. When pressing the UP or DOWN key to enter
any new set points, the control module will immediately
begin controlling based on the new set point.
Minimum water temperatures (domestic
hot water use)
Domestic water temperatures:
This high efficiency water heater should be operated at a
temperature setting high enough to prevent condensing of
the products of combustion on the unit’s heat exchanger or
in the attached venting system. Use extreme caution when
storing water at elevated temperatures. A water temperature
setting maintained above the dew point of the products of
gas combustion should prevent condensate formation and
ensure proper performance of the venting system. The
manufacturer recommends the use of a properly sized
thermostatic mixing valve to supply domestic hot water at
temperatures less than 140°F (60°C). Storing the water at a
higher temperature and thermostatically mixing the water
will increase the available quantity of mixed hot water,
greatly reducing the possibility of condensate formation
on the heat exchanger or in the venting system and help
prevent the growth of water borne bacteria.
NOTICE
Adequate care MUST be taken to
prevent a potential scald injury when
storing water at elevated temperatures
for domestic use.
ƽ CAUTION
An appliance allowed to operate at return
temperatures below the specified minimum
setting may experience problems with
the operating controls, safety switches,
obstruction of the flue gas passages on the
heat exchanger, incomplete combustion,
and possible flue gas spillage. Sustained
operation at lower than specified water
temperatures may cause hazardous
conditions that may result in personal
injury or non-warrantable damage to the
appliance.
The maximum temperature set point that can be programmed
into the control module from the Operator Interface for water
heater operation is 190°F (88°C). The control is factory pre-set
at approximately 120°F (49°C). Facilities with small children or
invalids may require 120°F (49°C) or a lower temperature setting
to reduce risk of scald injury. Some states may require a lower
temperature setting. Check with your gas supplier for local
requirements governing the temperature setting. Remember,
no water heating system will provide exact temperature at all
times. Allow a few days of operation at this setting to determine
the correct temperature setting consistent with your needs.
NOTICE
1. This water heater, when set at the
lower temperature setting, is not capable of
producing hot water of sufficient temperature
for sanitizing purposes.
2. Higher stored water temperature
increases the ability of the water heater
to supply desired quantities of hot water,
however remember --
ƽ CAUTION
Hotter water increases the risk of scald injury.
Thermostat adjustment procedure
1. Press the UP or DOWN key to view the set point
setting.
2. Press either the UP or DOWN key to increase or
decrease the displayed set point value.
3. Press the ENTER key to permanently store the new
set point into the control module’s memory.
Inlet water temperatures below the specified minimum
recommendations can excessively cool the products of
combustion resulting in condensation on the heat exchanger.
Condensation on the heat exchanger can cause operational
problems, bad combustion, sooting, flue gas spillage and
reduced service life of the related components.