Mini-MOD & Mini-Extension Installation Manual 21
059040-00 C
outdoor cutoff teMperature
Adjustable Off, from 20
º
F/ to70
º
C - 100
º
F, On
Default: 65ºF/ 18
º
C
Button:
MENU/Set Point/Outdoor Cutoff
in Set Point
Button:
MENU/Set Point/Offset/Outdoor Cutoff
in Reset
• If the outdoor sensor is installed, the Outdoor Cutoff screen will automatically appear after
the temperature Set Point has been selected.
• When the outdoor temperature falls to the adjustable Outdoor Cutoff temperature, the Mini-
MOD will control and modulate boilers to hold the calculated temperature.
• When the outdoor temperature rises to the Outdoor Cutoff plus a 2°F differential, the Mini-
MOD will turn all boilers off. The System relay will remain energized for the Run-On delay
then de-energize.
• The Outdoor Cutoff can be set from 20°F to 100°F. In addition, the Setting can be set
to ON or OFF. In the ON position, the System Relay will run regardless of the Outdoor
temperature (OD) and the burner stages will be active to hold the calculated water
temperature. (Note: The lowest water temperature the Mini-MOD will circulate is 70°F.
If the Outdoor Cutoff is turned ON and the Season is set to Winter, the Mini-MOD will
circulate at least 70°F water even in the hottest of weather.) In the OFF position, the system
pump will always be off and all burner stages will be off.
- OUTDOOR CUTOFF -
65
o
F
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offset
Adjustable from 50F
º/
28C
º
to (-50F
º
/-28C
º
)
Default: 0F
º
/0C
º
Button:
MENU/Set Point/Offset
in Reset only
• The Offset setting lets you adjust the starting points of the Reset Ratio curves. This means
that, regardless of the Outdoor temperature (OD), or the Reset Ratio that has been selected,
when the Offset setting is changed, that change is directly added to or subtracted from the
calculated temperature. For example, if the Set Point temperature was 130°F and the Offset
was changed from 0° to 10° (an increase of 10°), then the Set Point temperature would
increase to 140°F
------- OFFSET ------
+0
o
F
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Outdoor Temperature (in °F)
70 60 50 40
20
30
0
-10
10
-20
120
140
130
150
160
170
180
100
110
W
ater
Temperature (in °F)
Custom Reset Ratio
Point1: System=120°F
Oudoor=60°F
Point2: System=170°F
Oudoor=0°F
Point1
Point2
Customized Reset Ratio
Max Target
Min Target
Outdoor Temperature (in °F)
70 60 50 40
20
30
0
-10
10
-20
120
140
130
150
160
170
180
100
110
W
ater
Temperature (in °F)
Target Offset
Offset=10°F
Reset Ratio=1.5 : 1.0
Reset Ratio
Max Target
Min Target
Reset Ratio + 10F Offset
Min Target=120°F
Max Target=170°F
• The Offset setting does not change the ratio selection. For instance, with 1.00 (OD):1.00
(SYS) Reset Ratio, the System water temperature (SYS) will always increase one degree
for each degree change in the Outdoor temperature (OD). What the Offset does is add or
subtract a constant temperature value. (See "Understanding Operation Concept" on page 5.)
• If required:
Adjust the Water Offset in mild weather
. If the ambient building
temperatures are too warm in mild weather, decrease the Water Offset. If the ambient
building temperatures are too cold in mild weather, increase the Water Offset. The rule of
thumb for baseboard radiation is to change the Offset 4°F for every 1°F you wish to change
the building temperatures. In radiant heat applications, change the Offset 1°F or 2°F for
every 1°F you wish to change the building temperature.
MInIMuM Water teMp
Adjustable from 70
º
F/21
º
C to 180
º
F/82
º
C
Default: 70
º
F/ 21
º
C
Button:
MENU/Set Point/Offset/Outdoor Cutoff/Minimum Water Temp
in Reset only
• The Minimum Water Temperature must be set to the boiler manufacturer’s specification.
The Mini-MOD will calculate the Set Point based on the Outdoor temperature, the Reset
Ratio, and the Offset value. The Mini-MOD will control all boilers modulation to hold
either the Set Point temperature or the Minimum Water Temperature, whichever is higher.
• The Minimum Water Temperature must be at least 20°F lower than the Maximum
Temperature (See next setting).
MINIMUM WATER TEMP
70
o
F
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