heat-timer Mini-MOD-CNC Installation And Operation Manual page 26

DOMESTIC HOT WATER SETPOINT
THE DHW PRIORITY OPTIONS)
Adjustable from 140ºF/ 60ºC to 200ºF/ 93ºC
Button: MENU/<System Startup>/.../DHW Set Point
• On a DHW call, the Mini-MOD-CNC will raise the target to the DHW Set Point until the
DHW call expires.
SHUTDOWN/TSTAT/SETBACK MODE
Shutdown Input, Tstat Input, Setback Input
Button: MENU/<System Startup>/.../Setback\Shutdown
• The Mini-MOD-CNC has two levels of heat, a Normal/Day and a Setback/Night. The
Normal/Day is good for when buildings are occupied and people are active. The
Setback/Night holds a lower system temperature for night periods or when buildings
are unoccupied.
• When Shutdown or Tstat is selected, the DAY/NIGHT SCHEDULES will be available in the
operating menu. See "SHUTDOWN/TSTAT/SETBACK MODE" on page 25. Terminals 31
and 32 will function as a Shutdown (Turn off boilers when shorted) or as a Tstat (Turn off
boilers when opened). However, a call for DHW will bring the boilers on.
• When Setback is selected, the External Signal option will switch the Mini-MOD-CNC
to Setback mode when terminals 31 and 32 are shorted. This allows an external device
or control to provide the setback signal. No scheduling or boost menu options will be
available with Setback.
BOOST MODE (NOT AVAILABLE WITH EXTERNAL
SETBACK INPUT)
30 Minutes, Disabled
Button: MENU/<System Startup>/.../Boost Mode
• The morning Boost is designed to return the building to comfortable ambient temperatures
after the cooler Night (Setback) period. The Mini-MOD-CNC will accomplish this by running
elevated water temperatures (will add Setback setting to calculated water temperature)
for 30 minutes before the start of the Day schedule setting. That is, if the normal day set
point at a specific outdoor was 145˚F and the Setback setting was 20˚F, the boost will raise
the system calculated temperature to 165˚F for 30 minutes before the start of the Day
Schedule setting.
• If no Boost is needed, then simply select Disabled from the Boost Menu.
• Boost is only available if Shutdown or Tstat is selected as an option. See "SHUTDOWN/
TSTAT/SETBACK MODE" on page 25.
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26 HEAT-TIMER CORP.
(AVAILABLE WITH ANY OF
Default: 180ºF/82ºC
Default: Shutdown Input
Default: 30 Minutes
12 SEQUENCING BOILER SETTINGS
DHW SETPOINT
180°F
BACK
SETBCK/SHUTDOWN
Shutdown/Disable
Tstat/Enable
Setback
BACK
BOST MODE
30 Minutes
Disable
BACK
059102-00 REV. C
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