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DISPLAY MESSAGES
The Mini-MOD-CNC display layout reserved the second line for message indications. The following is a list of the most common
Message Display Line information:
•
Boost To 170˚F
The Boost has started 30 minutes before the Day Schedule setting and the Boost temperature is 170˚F.
•
DHW Call (180˚F)
There is a DHW call. The Mini-MOD-CNC will raise the system Set Point to the indicated temperature. DHW
increases calculated temperature to the DHW Set Point. See "DOMESTIC HOT WATER SET POINT" on page 25.
•
Holding Until 150˚F
The Lead boiler is in Last Stage Hold. This example shows that the lead stage will turn off when system
temperature reaches 150˚F. See "LAST STAGE HOLD" on page 34.
Lag Delay: 123
•
The lead boiler is at 100% and the remaining purge time to start the lag boiler in seconds is 123.
See "LAG DELAY" on page 35.
•
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 24 and "WIRING THE PROVE" on page 14.
•
Purge Delay: 23
A boiler is in purge cycle and the remaining purge time in seconds is 23. See "PURGE DELAY" on page 32.
•
Setback to: 130˚F
The Night Schedule or Setback input is active. Current Setback temperature is 130˚F. See "SETBACK"
on page 32.
•
Shutdown Active
The Shutdown Terminals are Shorted. No boilers will be active. See "SHUTDOWN/TSTAT/SETBACK
MODE" on page 25 and "WIRING THE SHUTDOWN, TSTAT, OR SETBACK" on page 14.
Summer
•
The control is set to Summer. No heat is active. See "SEASON" on page 29.
•
Switch in: 00:30
The switch from one group to the other will take place after 30 minutes. See "SWITCH DELAY" on page 21.
•
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 33.
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 24.
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42
HEAT-TIMER CORP.
17 MAINTENANCE
059102-00 REV. C
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