Prestige Indirect Fired Water Heater Sensor Application Supplement
9
4
. Press the + or - button until the desired “DHW ON
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 27 “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 27.
A maximum “DHW OFF Differential” parameter setting
will result in an extended burner firing cycle when
responding to any domestic water draws from the storage
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 setting.
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5)@15=5;-<<16/7.):)5-<-:+7=4,:-;=4<16
)6 -@+-;;1>- ,75-;<1+ ;<7:)/- <-58-:)<=:- :-;=4<
16/16)87<-6<1)4;+)4,0)B):,<1;;<:76/4A:-+75
5-6,-,<0)<<0-16;<)44-:=<141B-))6<1;+)4,<0-:57
;<)<1+ 51@16/ >)4>- 76 <0- 07< ?)<-: 7=<4-< 7. <0-
$;<7:)/-<)63)14=:-<7+7584A+7=4,:-;=4<16
;->-:-8-:;76)4162=:A,-)<07:;=*;<)6<1)48:78-:<A
,)5)/-
To revise the parameter setting within the Prestige
Control Module for “DHW OFF Differential” control, the
installer must enter the access code for the control mod-
ule as previously described in the Program Access of the
MCBA section.
1. Enter the access code.
2. Once the access code has been entered and
accepted, press MODE until the display shows
PARA.
3. Press STEP until the display shows P_27. This
parameter setting is the “DHW OFF Differential”
parameter. After releasing the STEP button the dis-
play will show the current setting.
DANGER
4. Press the + or - button until the desired “DHW OFF
Differential” setting is achieved. Press STORE to
save the setting. The display will flash when the
revised setting is accepted.
5. Once the desired parameter setting have been
revised and stored within the Prestige Control mod-
ule, press RESET to exit the CODE mode.
!$!"
:7;<:7<-+<176
With the addition of the IDWH sensor, the Prestige Control
module will now provide a Frost Protection feature to the
SMART IDWH tank. This feature becomes active when
Parameter 35 is set to 12 and cannot be overridden.
The Frost Protection feature is designed to protect the
SMART IDWH from a potential freeze up. The protec-
tion is activated once the IDWH sensor records a
domestic temperature of 37ºF. At that time the Prestige
boiler will begin the burner function at low input and the
DHW circulator will begin circulating. The burner will
continue operating at minimum input with the DHW cir-
culator energized until the sensor senses a domestic
water temperature of 50ºF. At that point the boiler will
shut down the burner function and the DHW circulator.
This feature is always active even if the DHW operation
is in the OFF mode.
1;+=6+<176;
There are several other Parameter settings available for
DHW applications, i.e. post pump features, blocking time
for burner operation. These features are explained more
in detail in the Prestige Control Supplement.