The performance specifications listed are based on
a DHW storage temperature setting of 140
º
F. Setting
other then the factory setting of 140
º
F will effect the
actual performance of the water heater.
DHW SET VALUE ADDITION
To achieve the boiler operating temperature during a
domestic request for heat the MCBA Control uses
Parameter 1 and a second parameter, Parameter 21
DHW Set Value Addition. Parameter 1 plus Parameter
21 will establish the boiler operating temperature limit.
If Parameter 1 is set below 134
º
F it is recommended that
Parameter 21 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 operating boiler temperature setpoint is based on
Parameter 1 plus Parameter 21 with a maximum operat-
ing temperature of 194
º
F.
To revise the parameter setting within the PRESTIGE
Control Module for the DHW Set Value Addition, the
installer must activate the access code for the control
module as previously described in the Program Access
of the MCBA section on page 10.
1. Enter into the access code mode.
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_21
. This
parameter setting is the DHW Set Value Addition
parameter. After releasing the STEP button the dis-
play will show the current setting.
NOTICE
IDWH Sensor Parameters
13
Parameter 46 has several other possible settings
available. The factory setting of the IWH is aquastat
control or
_13
. The required revised setting of the
IWH sensor control or
_12
. Any other setting of
parameter 46 could result in erratic or unreliable
operation of the PRESTIGE and/or Mini Smart result-
ing in severe personal injury, death or substantial
property damage.
6. To exit the Code mode, press the RESET button
once. The unit will go into a self-check mode upon
acceptance of the reset.
DHW TEMPERATURE SETTING
The parameter setting for the domestic storage temper-
ature set point is Parameter 1 and is accessible without
having to enter the access code.
To revise the parameter setting within the PRESTIGE
Control Module for the set point of the Domestic Storage
temperature, the installer can access the parameter set-
ting by entering the Parameter Mode
PARA
during nor-
mal operation, the access code is not required.
1. Press MODE once until the display shows
PARA
.
2. Press STEP until the display shows
1140
or 1XXX
(where XXX is a setting other than the factory setting).
3. Press the + or - button until the desired DHW stor-
age temperature setting is achieved. Press STORE
to save the setting. The display will flash when the
revised setting is accepted.
WARNING
