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22
Heat-Timer Corp.
operatIng settIngs
prograM cHange sWItcH settIng
To be able to change the Mini-MOD-CNC settings, the Program/Run Switch must be set to
Program. The switch is located under the Enclosure Wiring Cover for security. The Enclosure
Wiring Cover can be securely closed using a lock.
season
Winter, Summer
Button: MENU/Season
• The Mini-MOD-CNC will turn all boiler relays off when it is in Summer setting. However,
a DHW call will bring boilers back on if needed. The Message Display Line will display
Summer to show the status.
• When in Winter, the Mini-MOD-CNC will activate the System relay whenever the Outdoor
temperature (OD) falls below the Outdoor Cutoff setting. The Message Display Line will
not display any season information when in Winter.
• When the heating season is over, it is a good practice to switch the Mini-MOD-CNC to
Summer setting. This will allow DHW calls to operate the boilers when needed.
reset ratIo
Adjustable 1.00ºOD : 4.00ºSys to 4.00ºOD : 1.00ºSys
Button: MENU/Set Point
• The Reset Ratio determines how the System water temperature (SYS) will vary with
Outside temperature (OD). With any of the ratios, the colder it becomes outside, the hotter
the temperature of the system water. The ratios are adjustable from 1.00 (OD):4.00 (SYS) to
4.00 (OD):1.00 (SYS). See "Outdoor Reset Concept" on page 7.
• With a 1.00 (OD):4.00 (SYS) ratio, the System water temperature (SYS) will increase
rapidly as the outside temperature falls, hitting the maximum of 240°F at 24°F outside
temperature. With a 4.00 (OD):1.00 (SYS) ratio, the System water temperature (SYS) will
increase slowly as the outside temperature falls. Even at -30°F, the system water will only
be 125°F, and at 24°F outside, the system water will be 112°F. Such a low Reset Ratio
might be used with radiant floor heating applications.
• With most baseboard heating applications, a 1.00 (OD):1.00 (SYS) setting is a good place to
start. With a 1.00 (OD):1.00 (SYS) ratio, for every degree the outside temperature falls, the
system water temperature is increased one degree.
• If required: Adjust the RESET RATIO in cold weather. If the ambient building
temperatures are too cold in cold weather, move the ratio to a higher selection. That is,
if 1.00 (OD):1.00 (SYS) was initially selected, change the selection to 1.00 (OD):1.25
(SYS). If the building temperatures are too warm in cold weather, move the ratio to a lower
selection. That is, if 1.00 (OD):1.00 (SYS) was initially selected, change the selection to
1.25 (OD):1.00 (SYS).
offset
Adjustable from 50Fº/28Cº to -50Fº/-28Cº
Button: MENU/Set Point/Offset
• 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 0F° to 10F° (an increase of 10F°), then the Set Point temperature would
increase to 140°F
ENCLOSED
ENERGY
CAUTION
MANAGEMENT
More than one disconnect switch may be required
EQUIPMENT
99RA
to de-energize the equipment before servicing.
Default: Winter
Default: 1.00ºOD : 1.00ºSys
Default: 0Fº/0Cº
D
: RISK OF ELECTRIC SHOCK
PROGRAM
----- SEASON -----
Winter
Summer
▲
BACK
alert
DO NOT turn power off to the
Mini-MOD-CNC when heating
season is over. If you do so, the
battery will run down and will
have to be replaced. Instead,
switch to Summer.
-- SYSTEM TARGET --
o
1.00
OD = 4.00
o
1.00
OD = 3.00
o
1.00
OD = 2.00
o
1.00
OD = 1.50
o
1.00
OD = 1.25
o
1.00
OD = 1.00
o
1.25
OD = 1.00
o
1.50
OD = 1.00
o
2.00
OD = 1.00
o
3.00
OD = 1.00
o
4.00
OD = 1.00
▲
BACK
1:4
130
120
110
100
70
60
Outdoor Temperature
------- OFFSET ------
+0
[
▲
BACK
RUN
With a 0
Reset cur
100° Wat
▼
SAVE
With a -2
Reset cur
80° Wate
o
Sys
o
Sys
o
Sys
o
Sys
o
Sys
o
Sys
o
Sys
With a +2
o
Sys
Reset cur
o
Sys
120° Wat
o
Sys
o
Sys
▼
SAVE
1:1
Warmer
Colder
4:1
50
40
o
F
]
▼
SAVE
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