User Guide

Table Of Contents
16 © Copyright 2007 TAC All Rights Reserved. F-15479-8
Typical TAC Microtherm Controllers: TP-2xx Series, TP-3xx Series, and TP-4xx
Series.
C =Common of switch to R and B.
1 =Feedback from actuator (24 Vac with actuator full CCW to 12 Vac at CW end).
R =Closes on temperature drop and drives the actuator CCW (closes damper).
B =Closes on temperature rise and drives the actuator CW (opens damper).
Cycle of Operation
With the fan running:
1. Rotates actuator to CCW end (damper closed).
2. Allows actuator to modulate between 33% from CCW end to CW (damper open).
3. Allows actuator to modulate between 50% from CCW end to CW (damper open).
4. Allows actuator to modulate between 67% from CCW end to CW (damper open).
5. Rotates actuator to CW end (damper open).
When the fan is off, the damper is closed.
Figure-12 External Wiring for TAC Microtherm Controller with Five-Position 24 Vac Actuators.
4 5
6 7
3
8
2
H
1
GX
Green Wires
To 24 Vac
Power Supply
Case
Ground Screw
C
2
R
1
B
Add
Jumper
Case
Ground
Screw
100
SPDT Relay
To Load of
Fan Motor
Starter. The
Coil Voltage
Same as
Fan Motor.
Typical Actuators:
MP-379 and MP-389
Five-Position Switch
1
Close
3
2
5
Open
4
Add Resistor
(Supplied with Actuator)