Titus Mixing Box Controls IOM - Manual (Page 10)

Mixing Box Control Installation Manual
IOM-MBC-00 08-30-04
10 of 15
Figure 12. Typical Damper Motor to Mixing Box
Installation
Verification
Operate the motor through its complete open-close stroke.
If necessary, release one of the previously tightened
linkage connections to prevent damage. Check for proper
operation, making sure that the linkage does not bind and
that the motor travels smoothly throughout its fully open
and fully closed positions. This motor checkout ensures:
•
The motor operates the load.
• The motor responds properly to the controller.
• There is no binding of the linkage or motor stalling at
any point of travel.
If motor does not operate properly, check for proper
voltage or mechanical binding in linkage or damper.
If questions arise regarding this product, contact your
distributor or Titus representative.
Logic Module – W7459A
The logic module provides the operation control to the
Damper Motor. Use the enthalpy set point of the logic
module to select air temperature and humidity suitable for
free cooling. Figure 13 depicts the logic module.
Remote Minimum Position Control
Remote control of the outdoor air dampers is desirable
when temporary additional ventilation may be required.
The potentiometer in the logic module controls the
minimum position of the dampers.
Operation
Tables 11 and 12 provide operating rating and specific
information.
Figure 13. Fully Modulating Logic Module
Table 11. Operational Ratings
g n it a R n o it a r e p O
Operating ambient
temperature
25º Fahrenheit t
p
to
+125º Fahrenheit (32 to
+52º Celsius)
Humidity 5 to 95 percent relative
humidity
Input voltage 24 Vac, 50/60 hertz
Relay contact rating at 24 Vac 1.5 A run, 3.5 A inrush
Discharge air temperature
input
Single-pole, single-throw
(spst)
Minimum position
potentiometer adjustment
None
(Minimum position
adjustment is built into
damper motor M7415A)
Terminals for remote
minimum damper position
None
Output relays 2 Single-pole, double-
throw (spdt)
Application To be used with
•
Solid-state enthalphy
sensor C7400A
• Modulating damper
motor M7415A
Installation
The logic module mounts on the side of the Modulating
Damper Motor (W7415A). When planning the installation,
allow ample clearance for maintenance and service.
Ensure the location is protected from rain and snow.
1. Align logic module to prongs of the Damper Motor
and press module and motor together.
2. Secure logic module to damper motor using the
supplied mounting screw.