Operating Settings; Program Change Settings; Season; Set Point - heat-timer Mini-MOD Installation And Operation Instruction Manual

20 Heat-Timer Corp.

operatIng settIngs

prograM cHange settIngs

To be able to change the Mini-MOD 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 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 will activate the System relay whenever the Outdoor
temperature (OD) falls to or below the Outdoor Cutoff setting. In addition, it will begin
heating whenever the System temperature (SYS) falls below the Set Point Temperature. 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 to Summer
setting. This will allow DHW calls to operate the boilers when needed.

set poInt

(noT aDjusTaBle in ems moDe)
Adjustable from 70ºF/ 21ºC to 250ºF/ 121ºC
Button: MENU/Set Point
• The Set point is the temperature value the Mini-MOD will use to control the system.
• It will only be available when Set Point is selected as the Sensor Type.
• The Mini-MOD will increase, decrease or hold the modulation of the boilers to maintain the
system temperature around the Set point. The amount of fluctuation around the set point
depends on the Modulation Mode, System Settings, and Stage Settings.
• If the EMS Mode was Enabled, the Set Point will be set by the EMS/BMS system and will
be available to be read but not changed on the display.

reset ratIo

Adjustable 1.00ºOD : 4.00ºSys to 4.00ºOD : 1.00ºSys
Button: MENU/Set Point
• Only available when Reset is selected as the Sensor Type.
• 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 Understanding Operation Concept on page 5)
• 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).
ENCLOSED
ENERGY
CAUTION
MANAGEMENT
More than one disconnect switch may be required
EQUIPMENT
99RA to de-energize the equipment before servicing.
Default: Winter
Default: 70ºF/ 21ºC
Default: 1.00ºOD : 1.00ºSys
D
: RISK OF ELECTRIC SHOCK
PROGRAM
----- SEASON -----
Winter
Summer
▲
BACK
alert
DO NOT turn power off to the
Mini-MOD when heating season
is over. If you do so, the battery
will run down and will have to
be replaced. Instead, switch to
Summer.
------ SET POINT ----
70
[
▲
BACK
-- 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
RUN
▼
SAVE
With a 0
Reset cur
100° Wat
o
F
]
▼
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