4. Press the + or - button until the desired “DHW Set
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
module, press RESET to exit the CODE mode.
The performance specifications listed are based on
a DHW set value setting of 46
º
F. A setting other than
the factory setting of 46
º
F will effect the actual per-
formance of the water heater.
DHW DETECTION ON PARAMETER
The MCBA Control Module has 2 differential settings for
the burner operation when using the IDWH Sensor
parameter setting. The first differential setting the
installer has the option of adjusting is Parameter 38
“Detection ON”. This parameter sets the DHW storage
temperature low limit. The burner operation will respond
when the DHW storage temperature drops below
Parameter 1 setting minus Parameter 38 setting.
A minimum “Detection ON” parameter setting will create
a quicker burner operation response to any domestic
water draws from the water heater. In contrast, a maxi-
mum “Detection ON” setting will result in a delay
response to domestic draws.
To achieve the performance specification listed for
this water heater, it is recommended the factory set-
ting of 18
º
F be revised to 2
º
F.
The “Detection ON” setting of Parameter 38 greatly
affects the production of domestic hot water. A min-
imum setting of Parameter 38 could result in a rapid
response to a DHW request for heat resulting in a
potential scald hazard. It is strongly recommended
that the installer utilize a anti-scald thermostatic mix-
ing valve on the hot water outlet of the water heater.
Failure to comply could result in severe personal
injury, death or substantial property damage.
DANGER
NOTICE
NOTICE
IDWH Sensor Parameters
14
To revise the parameter setting within the PRESTIGE
Control Module for DHW “Detention ON” control, 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_38
. This
parameter setting is the Detection ON parameter.
After releasing the STEP button the display will
show the current setting.
4. Press the + or - button until the desired DHW
“Detection ON” setting is achieved. Press STORE
to save the setting. The display will flash when the
revised setting is accepted.
5. Once the desired parameter settings have been
revised and stored within the PRESTIGE Control
module, press RESET to exit the CODE mode.
DHW DETECTION OFF PARAMETER
The second differential setting is Parameter 39
“Detection OFF”. This parameter sets the DHW storage
temperature high limit. The burner operation will cease
when the DHW temperature rises above Parameter 1
plus Parameter 39.
A maximum “Detection OFF” parameter setting will result
in an extended burner firing cycle when responding to
any domestic water draws from the water heater. This
extended burner firing cycle could result in a final tem-
perature of the domestic hot water that is higher than the
desired temperature setting.
To achieve the performance specifications listed for
this water heater, it is recommended the factory set-
ting of 0
º
F be revised to 8
º
F.
NOTICE
