Prestige Indirect Fired Water Heater Sensor Application Supplement
8
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To achieve a boiler operating temperature during a domes-
tic request for heat the MCBA Control uses Parameter 1
and a second parameter, Parameter 33 DHW Setpoint
Value Addition. Parameter 1 plus Parameter 33 will estab-
lish the boiler operating temperature.
If Parameter 1 is set below 134ºF it is recommended that
Parameter 33 be reset to a higher setting. The request
for domestic heat is based on the temperature reading of
the DHW sensor and its relationship to Parameter 1.
The boiler temperature setpoint is based on Parameter
1 plus Parameter 33 with a maximum operating temper-
ature of 194ºF.
To revise the parameter setting within the Prestige
Control Module for the DHW Setpoint Value Addition, the
installer must enter the access code for the control mod-
ule as previously described in the Program Access of the
MCBA section.
1. Enter the access code.
2. Once the access code has been entered and
accepted, press MODE until the display shows
PARA.
3. Press STEP until the display shows P_33. This
parameter setting is the DHW Setpoint Value
Addition parameter. After releasing the STEP button
the display will show the current setting.
4. Press the + or - button until the desired “DHW
Setpoint Value” setting is achieved. Press STORE
to save the setting. The display will flash when the
revised setting is accepted.
5. Once the desired parameter setting have been
revised and stored within the Prestige Control mod-
ule, press RESET to exit the CODE mode.
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The MCBA Control Module has 2 differential settings for
the burner operation when using the IDWH Sensor kit.
The first differential setting the installer has the option of
adjusting is Parameter 26 “DHW ON Differential”. This
parameter sets the DHW storage temperature low limit.
The burner operation will respond when the DHW stor-
age temperature drops below Parameter 1 minus
Parameter 26 setting.
A minimum “DHW ON Differential” parameter setting will
create a quicker burner operation response to any
domestic water draws from the domestic storage tank.
In contrast, a maximum “DHW ON Differential” setting
will result in a delayed response to domestic draws.
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To revise the parameter setting within the Prestige
Control Module for “DHW ON Differential” control, the
installer must enter the access code for the control mod-
ule as previously described in the Program Access of the
MCBA section.
1. Enter the access code.
2. Once the access code has been entered and
accepted, press MODE until the display shows
PARA.
3. Press STEP until the display shows P_26. This
parameter setting is the “DHW ON Differential”
parameter. After releasing the STEP button the dis-
play will show the current setting.
DANGER