heat-timer Mini-MOD-CNC Installation And Operation Manual page 15

WIRING THE SHUTDOWN, TSTAT, OR SETBACK
• The Shutdown will be available when selected as the SHUTDOWN/TSTAT/SETBACK mode from the
Startup menu. See "SHUTDOWN/TSTAT/SETBACK MODE" on page 25. This will provide the user
with an adjustable Day/Night Schedule. See "DAY/NIGHT SCHEDULES" on page 37.
• The Shutdown feature can be used whenever it is desirable to turn off the Mini-MOD-CNC stage
outputs from a remote location or another controller (i.e. EMS input).
• The Tstat option, when selected from the SHUTDOWN/TSTAT/SETBACK STARTUP menu, offer the
capability of controlling the operation of the Mini-MOD-CNC based on a thermostat input. This will
provide the user with an adjustable Day/Night Schedule.
• The thermostat will send the Mini-MOD-CNC a call for heat by shorting terminals 31 and 32.
• When the Shutdown input is enabled by closing the dry contact, or when the Tstat input is
disabled by opening the dry-contact, all active modulating boilers will immediately modulate down
to low for the Soft-Off period, then turn off. All staging boilers will turn off immediately.
• The System Output relay will remain active until the System Run-On Delay expires and then it will
turn off.
• When Setback is selected in the Startup, a BMS/EMS or external clock can provide a Setback
signal using these input terminals. See "SHUTDOWN/TSTAT/SETBACK MODE" on page 25.
No Day/Night Schedule will be available when Setback is selected from the SHUTDOWN/TSTAT/
SETBACK mode in the Startup menu.
• The signal must be a dry contact only. No voltage can be placed across the SHUTDOWN/TSTAT/
SETBACK terminals.
• Bring the two wires from the dry contact to the terminals marked SHUTDOWN/TSTAT/
SETBACK - 31, 32.
WIRING THE PROVE
• The Prove feature is provided to check system component operation and must be selected in the
Startup Menu from the Prove/DHW Sharing menu. See "PROVE/DOMESTIC HOT WATER (DHW)
PRIORITY"on page 24.
• A typical use of this feature is to check for pump flow or combustion air damper status before
firing any boiler.
• If the PROVE input is open on a call for heat, the Mini-MOD-CNC will enable only the System
Output. All boiler outputs will be off when the PROVE input is open.
• A factory-installed jumper provides the System Prove signal. Do not remove the jumper unless it will
be replaced by a System Prove signal or these terminals are to be used for DHW call input.
• Bring the two wires from the dry contact to the terminals marked PROVE - 29, 30. No voltage can
be placed across the PROVE terminals.
• Prove Input terminals can accept a dry-contact signal only. No voltage can be placed across
these terminals.
WARNING
The PROVE input cannot be used as a safety limit. All equipment must have its own
certified limit and safety controls as required by local codes. If Prove is selected in the
startup menu, no boiler stage will start unless Prove terminals are shorted. DO NOT
remove the PROVE jumper supplied unless replacing it with a Prove signal.
059102-00 REV. C
(TERMINALS 29, 30)
(TERMINALS 31, 32)
09 WIRING
SHUTDOWN,
TSTAT OR
SETBACK SIGNAL
PROVE SIGNAL
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HEAT-TIMER CORP. 15