Titus ZECV IOM - Manual (Page 4)

ZECV-IOM-4.0 3-1-03
Service Procedure Check Sheet
I. Verify all wires are tightly secured to the proper terminals. CAUTION: Do NOT touch terminals with a screwdriver while
power is on.
II. Verify CONTOLLER/ACTUATOR operation:
A. Observe motor operation through observation window. It should be rotating frequently and rocking back and forth in
response to changes in air flow.
B. Observe arrow on the end of the damper shaft. Verify that damper rotates a full 90 degrees on call from full
pressure.
C. Verify the setscrew is secure to the damper shaft at the proper location. Do NOT alter factory setting. CAUTION:
Motor may be hot to the touch. (May be up to 150° F).
III. PROBLEMS AND POSSIBLE SOLUTIONS:
A.Power supply (#9 and #10) out of range -
- If ZERO, turn power on the read again.
- If power is on, determine reason for damage,
Repace faulty or undersized transformer.
B. Damper remains full OPEN-
- Verify sufficient primary air flow to terminal.
- Check for loose damper set screw.
- Verify damper is positioned correctly.
- Verify limits are not set too high at the thermostat.
C. Damper remains full CLOSED-
- Check continuity for broken sensor wires.
- Verify damper set screw is secure.
- Verify damper position is correct.
- Verify damper is free to turn.
D. Damper remains STOPPED (won’t open or close)
- Verify 24 VAC on motor that should be rotating.
- Reset thermostat slider and check opposite motor for 24 VAC.
- Verify damper is free to turn.
- Replace faulty controller/actuator.
Voltage Range
Supply Voltage, AC
20.4-28.8 0 or 24 0 or 24
Terminal Connectors #9, #10 #11, #12 #13, #14
Tag Location
Thermostat
Setting
Power Supply
CCW
Motor
CW
Motor