Titus Mixing Box Controls IOM - Manual (Page 11)

Mixing Box Control Installation Manual
IOM-MBC-00 08-30-04
11 of 15
Settings and Adjustments
The face of the logic module has two potentiometers with
slots for adjustment. Use a slotted screwdriver to adjust
the potentiometers. Figures 14 and 15 show potentiometer
adjustment slots.
Figure 14. Enthalpy Set Point Potentiometer Location
Figure 15. Meter Location for Verification and
Troubleshooting
Minimum Damper Position
The minimum position potentiometer keeps the outdoor air
damper from closing completely during system operation
to provide ventilation.
1. Ensure the factory-installed jumper is in place
across terminals P and P1 (T and T1 are
disconnected).
2. If remote control of dampers is desired, connect the
remote potentiometer and turn it fully clockwise
before adjusting the minimum position. See Figure
14.
3. Connect 24 Vac at terminal TR and TR1 and adjust
the potentiometer on the logic module face with a
screwdriver for desired minimum position.
Wiring
Disconnect power supply before connecting wiring to
prevent electrical shock or equipment. All wiring must
comply with applicable local codes, ordinances, and
regulations. Figure 16 shows a modulating circuit.
Figure 16. Modulating Control Circuit