heat-timer Mini-MOD-CNC Installation And Operation Manual page 14

• All wiring must enter the enclosure through the bottom knockouts.
• Class 1 voltage wiring must utilize a different knockout and conduit from any Class 2
voltage wiring.
WIRING THE POWER
• Bring the 120VAC 60Hz power wires through the bottom left knockout of the enclosure.
• Connect the hot line to terminal marked L.
• Connect the neutral line to the terminal marked N.
• Heat-Timer recommends installing a surge suppressor on the power source to the Mini-MOD-CNC.
WARNING
Class 1 voltages must enter the enclosure through a different opening from any class 2
voltage wiring. Heat-timer recommends installing a surge suppressor on the power source
to the Mini-MOD-CNC.
WIRING THE SENSORS
NOTE
Connect the shield at the control terminal end and cut the shield wire at the
sensor end.
SYSTEM SENSOR WIRING
• A Mini-MOD must be connected to a System temperature sensor (P/N 904220-00 provided)
located in the common header. The sensor must be inserted in a 3/8 ID well (P/N 904011-00
or equivalent).
• Temperature sensor wires can be extended up to 500' by splicing its wires with a shielded
2-conductor cable (Belden #8760 or equivalent (#18/2)).
• Temperature sensors have no polarity. Connect the two wires from the sensor to the
Mini-MOD-CNC terminals marked SYSTEM TEMP 27, 28.
• Connect the sensor shield to the circled terminal 28 with one of the sensor wires.
OUTDOOR SENSOR WIRING
• The Mini-MOD-CNC will vary the system Set Point based on outdoor temperature. In addition, the
outdoor sensor is used as an Outdoor Cutoff. The Mini-MOD-CNC will disable all boilers when the
outdoor temperature is above the adjustable Outdoor Cutoff temperature.
• For an outdoor sensor use the outdoor sensor provided (P/N 904220-00).
• The sensor wires can be extended up to 500' using shielded 2-conductor cable (Belden #8760 or
equivalent (#18/2)).
• Temperature sensors have no polarity. Connect the wires from the outdoor sensor to the
Mini-MOD-CNC terminals marked OUTDOOR TEMP - 25, 26.
• Connect the shield to the circled terminal 26 with one of the sensor wires.
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14 HEAT-TIMER CORP.
(TERMINALS 1, 2)
(TERMINALS 27, 28)
(TERMINALS 25, 26)
09
WIRING
120VAC Power
Source
059102-00 REV. C