Mcf Valve Operation; Mounting The Controller; Wiring Power Input; 120Vac - heat-timer DIGI-SPAN Elite MC Series Installation And Operation Manual

MCF vALvE OpErAtIOn

When the MCF Elite is set to modulate a valve, it starts when the EXT+ and EXT- terminals are shorted. The control will
activate the output relay (Yellow Wires) and start to pulse the valve open or close to get the system sensor value to the
Target set point. In many cases, the output relay will be controlling a pump.
On a reduction in the demand the MCF Elite will pulse the valve close. If no additional output is needed, the control
will energize the Decrease output for 6 minutes to guarantee valve closure. The output relay (Yellow Wires) will remain
energized for the Run-On period.

MOuntIng thE COntrOLLEr

• The MC DIGI-Elite is designed to mount
on a 1900 (4"x4") electrical box.
• If the MC-Elite is to be panel
mounted, or if additional room is
needed use the Plastic Wiring
Enclosure (HT# 929135-00 Switch) or
(HT# 929137-00 without a Switch).
• Locate the MC-Elite in a location near
the unit to be controlled.
• Partially unscrew the Display Cover
Mounting screws to remove it.
• Lift the Display Section away from the
base to unplug the Connection Socket
from the Base section.
• Proceed with the power and output
wiring instructions.
• Mount the MC-Elite away from excessive
heat or cold.
• Mount Display Section back to the Base
Section. Tighten the Display Cover
Mounting Screws.

WIrIng pOWEr Input

The MC Elite can be wired to either 120VAC using the two Black wires or 24VAC
using the right most two terminals on the terminal block on bottom of the control.
Heat-Timer recommends the installation of a Surge Suppressor and a Power
Switch before the Power Line connection for safety and ease of service.

120vAC

• Connect the 120VAC power to the two Black wires extending from the back of
the MC Elite. Remember to use the power line from a different source than the
equipment being controlled.
24vAC
• Use a dedicated transformer with at least a 5 VA output.
• Bring 24VAC to the two right most screws on the front of the MC Elite marked
24VAC and COM
MC-Elite Installation and Operation Manual
Display Section
Display Cover
Mounting Screws
the MC can accept only one source of power: 120vAC or 24vAC . If
more than one power source is applied, the unit may be damaged .
Connection
Socket
Input Terminals
24VAC optional
WArnIng
Input Terminals
T2 COM T3+ T3-
Base Section
Base Mounting Holes
power input
120 VAC
EXT+EXT- P+ P- COM24VAC
24 VAC
Optional Power
5