Dhw Off Differential - TriangleTube Prestige Excellence Installation And Maintenance Manual

Water Heater Start-Up
DANGER
The DHW ON Differential setting of Parameter
38 greatly affects the production of domestic hot
water. A minimum 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
the factory supplied thermostatic mixing valve
on the DHW outlet of the Excellence. Failure to
comply could result in severe personal injury,
death or substantial property damage.
To revise the parameter setting within the Prestige
Control Module for DHW ON Differential control,
the installer must activate the service code for the
control module as previously described in the
Program Access of the MCBA section.
1. Enter into the service 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
This parameter setting is the DHW ON
Differential parameter.
STEP button the display will show the current
setting.
Parameter Factory Setting
38 02ºF
4. Press the + or - button until the desired 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 has been
revised and stored within the Prestige Control
module, press RESET to exit the CODE mode.
P_38
.
.
After releasing the
Minimum Maximum
Setting Setting
(-) 06ºF 54ºF

DHW OFF Differential

The second differential setting is Parameter 39
DHW OFF Differential. This parameter sets the
DHW storage temperature high limit. The burner
operation will cease when the DHW storage tem-
perature rises above Parameter 1 plus Parameter
39.
A maximum DHW OFF Differential parameter set-
ting will result in an extended burner firing cycle
when responding to any domestic water draws
from the Excellence. This extended burner firing
cycle could result in a final storage temperature of
the domestic hot water that is higher than the
desired storage temperature setting.
DANGER
The DHW OFF Differential setting of
Parameter 39 greatly affects the production
of domestic hot water. A maximum setting of
Parameter 39 could result in an excessive
domestic storage temperature resulting in a
potential scald hazard. It is strongly recom-
mended that the installer utilize the factory
supplied thermostatic mixing valve on the hot
water outlet of the Excellence. Failure to
comply could result in severe personal injury,
death or substantial property damage.
To revise the parameter setting within the Prestige
Control Module for DHW OFF Differential con-
trol, the installer must activate the service code for
the control module as previously described in the
Program Access of the MCBA section.
1. Enter into the service 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
This parameter setting is the DHW OFF
Differential parameter.
STEP button the display will show the current
setting.
16
P_39
.
After releasing the