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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.
9 Domestic water heaters
Figure 9-5_Danger Warning
Installation & Operation Manual