6 of 8
to condense. Consult the boiler manufacturer for recommended minimum boiler supply temperatures. Some typical settings are as
follows:
• Steel fire tube boiler ….......... 140 to 160
°
F (60 to 71
°
C)
• Condensing boiler ................. Off
• Cast iron boiler ….................. 135 to 160
°
F (57 to 71
°
C)
• Electric boiler ........................ Off
• Copper tube boiler …............. 125 to 150
°
F (52 to 66
°
C)
Differential (DIFF)
The differential adjustment sets how far the actual boiler supply water temperature may deviate from the desired temperature before
the boiler is turned on or off, and it is determined by the flow rate through the system pump relative to the heat output by the boiler.
The differential can be adjusted to Ad (Auto differential) or from 2 to 42
°
F (1 to 23
°
C). The following formula can be used to calculate
the desired differential:
When the adjustment is set to
Ad (Auto Differential
), the differential is continuously calculated by the control, and varies as the heating
load changes.
Interstage Delay
The interstage delay setting is used to set the minimum time delay between the first stage firing and the second stage firing, and is
adjustable from 30 seconds to 4 minutes.
Warm Weather Shut Down (WWSD)
The WWSD can be adjusted from 35 to 100
°
F (2 to 38
°
C). The boiler will be shut down when the outdoor temperature is warmer than
this setting. If the WWSD is set to OFF, the control continues to provide a minimum boiler temperature even during warm outdoor
temperatures.
Control Adjustments
Boiler Start: ______________________________________
Boiler Minimum: _______________________________
Outdoor Start: ____________________________________
Differential: __________________________________
Boiler Design: ____________________________________
Interstage Delay: ______________________________
Outdoor Design: __________________________________
WWSD: ______________________________________
Differential
=
Example:
=
10
°
F (6
°
C)
Btu/hr input
100,000 Btu/hr
System US GPM x 500
20 US GPM x 500
ADJUST MENU
To enter the adjustment mode,
Press
and
Hold
simultaneously, the
Item
, and Buttons. The
ADJUST
element will turn on.
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
BOIL
°
F
ADJUST
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
DSGN
OUTDR
°
F
ADJUST
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
min
ADJUST
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
OUTDR
°
F
ADJUST
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
BOIL
°
F
MIN
ADJUST
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
WWSD
°
F
ADJUST
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
DSGN
BOIL
°
F
ADJUST
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
DIFF
ADJUST
Start
Interstage
Delay
DHW
Demand
Boiler
Demand
°
F
ADJUST
BOIL Start
Use the and
buttons to set the
desired boiler starting
tempeature.
OUTDR Start
Press and release
the
Item
button. Use
the and buttons
to set the desired
outdoor starting
tempeature.
BOIL DSGN
Press and release
the
Item
button. Use
the and buttons
to set the boiler
design tempeature.
OUTDR DSGN
Press and release
the
Item
button. Use
the and buttons
to set the outdoor
design tempeature.
BOIL MIN
Press and release
the
Item
button. Use
the and buttons
to set the boiler
minimum
tempeature.
DIFF
Press and release
the
Item
button. Use
the and buttons
to set the boiler
differential
tempeature.
Interstage Delay
Press and release
the
Item
button. Use
the and buttons
to set the desired
interstage delay time.
WWSD
Press and release
the
Item
button. Use
the and buttons
to set the desired
WWSD tempeature.
Units
Press and release
the
Item
button. Use
the and buttons
to select between
°
F
and
°
C
The control automatically goes back to viewing when the buttons are left alone for 20 seconds
All settings will be saved even during power down of the control
