Prestige Indirect Fired Water Heater Sensor Application Supplement
17
4
. Press the + or - button until the desired “DHW OFF
Differential” setting is achieved. Press STORE to
s
ave 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-
u
le, press RESET to exit the CODE mode.
$!
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 temperature rises above
Parameter 1 plus Parameter 39.
A maximum “DHW OFF Differential” parameter setting
will result in an extended burner firing cycle when
responding to any domestic water draws from the stor-
age tank. 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 set-
ting.
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To revise the parameter setting within the Prestige
Control Module for “DHW OFF 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_39. This
parameter setting is the “DHW OFF Differential”
parameter. After releasing the STEP button the dis-
play will show the current setting.
DANGER
4. Press the + or - button until the desired “DHW OFF
Differential” 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.
$!&!"!
The boiler provides a domestic hot water priority feature,
which will block a heating call when a domestic hot water
call is present. A DHW priority timeout setting of 00
(Factory Setting) will not limit the length of a domestic call.
A domestic call will always have priority over a heating call.
A DHW priority timeout setting above 00 will limit the
length of a domestic call when both domestic and
heating calls are present. Once the DHW priority time-
out setting has been reached, priority will shift to the
heating call. If both calls continue, the priority will
switch back to the domestic call after reaching the
DHW priority timeout setting.
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;?1<+016/*-<?--6,75-;<1+)6,0-)<16/+)44;!01;
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To revise the parameter setting within the Prestige
Control Module for “DHW Priority Timeout” 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.
NOTICE