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• Outdoor Cutoff
The outdoor temperature is above the Outdoor Cutoff setting. No boilers will be active for heating.
• Prove Failure
After boilers have run for some time, Prove signal has ended. All boilers set to Auto or Standby will de-
energize. However, the System relay will remain energized. See "Prove/Domestic Hot Water (DHW)
Priority" on page 19 and "Wiring the Prove" on page 12.
• Purge Delay: 23
A boiler is in purge cycle and the remaining purge time in seconds is 23. See "Purge Delay" on page 24.
• Setback to: 130˚F
The Night Schedule or Setback input is active. Current Setback temperature is 130˚F. See "Setback"
on page 24.
• Shutdown Active
The Shutdown Terminals are Shorted. No boilers will be active. See "Shutdown/Tstat/Setback Mode" on
page 19 and "Wiring the Shutdown, Tstat, or Setback" on page 11.
• Summer
The control is set to Summer. No heat is active. See "Season" on page 22.
• Switch in: 00:30
The switch from one group to the other will take place after 30 minutes. See "Switch Delay" on page 17.
• System Run-On: 46 The System relay is ON for the System Run-On Delay. This example shows that it will remain in System
Run-On for an additional 46 seconds before turning off. See "System Run-On" on page 24.
• Tstat Call
The Tstat Terminals are Shorted. Boilers will be active.
• Waiting for Prove
The System relay is ON and the prove terminals are open before the lead boiler relay can energize. See
"Prove/Domestic Hot Water (DHW) Priority" on page 19.
BoIler stage settIngs
Button: STAGE/
The Stage menu offers the capability of adjusting each of the boiler's operation individually.
• In most installations, all active boiler adjustments are the same, but each can be configured
differently if desired.
• If the boilers are not set up properly, the Mini-MOD-CNC operation may appear to be
erratic.
• When the STAGE button is depressed, the Boiler A settings menu will be shown.
• Make all the appropriate settings for Boiler A (See below).
• After completing all the settings for Boiler A (See below), you have the option of copying
these settings to all other modulating boilers. Everything but the Mode -- Auto/Standby/
Manual/Off/On -- will be copied.
• Then select the Next Stage option from the menu to bring up the Boiler B settings menu and
make all the settings. Continue until all boilers have been set.
• If a Mini-Extension is connected to the Mini-MOD-CNC and the stages have been set
through the Startup menu, then scrolling through stages using the Next Stage and Prev
Stage menu options will scroll through the Mini-Extension stages as well.
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.
Mode
Auto, Standby, Manual, Off, On
Button: STAGE/Mode
• The Mini-MOD-CNC only controls the modulation of boilers set to Auto or (after a
delay) those set to Standby. None of the other settings are recommended for output boilers
connected to active units.
• Any stage without an active unit connected must be set to Off.
• The following list describes the MODE options:
Auto
The Mini-MOD-CNC will control the boiler's operation to maintain the desired Set
Point. Only boilers set to Auto can be Lead boilers.
Standby Standby boilers can only be activated when all boilers in Auto have been at 100%
modulation or at High fire for the full Standby Time. Standby is generally used
when you want a specific boiler to be available in extreme load conditions. Note
that a Standby boiler Cannot be a Lead boiler.
Mini-MOD-CNC & Mini-Extension Installation Manual
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 12VA MAX
USE COPPER CONDUCTORS ONLY
ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
99RA
alert
Modulating Boiler Stage Menu
STAGE A SETTINGS
Mode
Ignition %
Mod Start %
<Prev Stage>
<Next Stage>
Copy Settings
BACK
Sequencing Boiler Stage Menu
STAGE A SETTINGS
Mode
<Prev Stage>
CAUTION
: RISK OF ELECTRIC SHOCK
<Next Stage>
More than one disconnect switch may be required
to de-energize the equipment before servicing.
BACK
Default: Auto
Standby
Manual
Off
On
BACK
31
Auto
SYSTEM
1%
80%
A
B
▲
▼
SAVE
C
D
Auto
▲
▼
SAVE
PROGRAM
RUN
STAGE A MODE
Auto
▲
▼
SAVE
Full Mo
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