Field Controls CAC-24 User manual

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Please retain these instructions after installation.
This device MUST be installed by a qualied agency in accordance with the manufacturer's installation instructions. The denition of
a qualied agency is: any individual, rm, corporation or company which either in person or through a representative is engaged
in, and is responsible for, the installation and operation of HVAC appliances, who is experienced in such work, familiar with all the
precautions required, and has complied with all the requirements of the authority having jurisdiction.
READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY BEFORE PROCEEDING WITH THE INSTALLATION.
Installation Date:
Installed By: Phone:
COMBUSTION AIR CONTROL
CAC-24
This kit is designed to control more than one appliance on a system using the Field Controls CAS-4 Combustion
Air System with a chimney vented 24 VAC controlled combustion appliance. The controls in the CAS-4 will
operate only one appliance, therefore a CAC-24 is required for each additional appliance to be added to the same
CAS-4 unit. One CAS-4 unit can handle, at max, a total combined ring rate input of up to 450,000 BTU/HR. Refer
to the instructions included with the CAS-4 for more details and other restrictions.
ITEMS INCLUDED IN KIT:
1- Junction box with mounted fan proving switch and relay base
1- 24 VAC relay
1- Conduit connector
1- 10 Ft. length of 1⁄4" plastic tubing
1- Plastic Tee

page 2
Wire the controls in accordance with the National Electrical Code, manufacturer’s recommendations and/
or applicable local codes. UNIT MUST BE GROUNDED. Check ground circuit to make certain that the unit
has been properly grounded. The wiring should be protected by an overcurrent circuit device rated at 15
amperes. CAUTION must be taken to ensure that the wiring does not come into contact with any heat source.
All line voltage circuits MUST be wired in accordance with the National Electrical Code for Class 1 wiring or
equivalent methods.
1. Remove one knockout from the junction box on the fan proving switch side. Install line voltage power
supply wires to the CAS unit as shown in Figure 1.
2. Remove one knockout from the side of the junction box opposite the fan proving switch. Run line voltage
wiring to the appliance controls as shown in Figure 1. Refer to the appropriate gas system conguration
diagram for your specic appliance.
3. Insert the 24 VAC relay into the base on the CAC-24 and secure with the retaining clip.
4. Install the junction cover and secure with the 4 provided sheet metal screws.
WIRING
MOUNTING JUNCTION BOX
The junction box may be mounted anywhere that is convenient for routing the wiring and tubing. Mount the
CAC-24 to a wall or oor joist using the four dimpled locations on the base of the box (See Figure 1).
Note: The unit must be mounted so the draft proving switch is vertical as shown in Figure 1. The CAC-24
should be placed close enough to the CAS unit to route the provided 10 foot long plastic tubing from the
draft proving switch to the exposed tubing on the CAS. If mounting further away, the installer must provide
any necessary ttings and extra tubing.

page 3
FAN PROVING SWITCH AIR SENSING TUBE INSTALLATION
1. Attach the provided plastic tubing to the fan proving switch on the CAC-24 using the plastic compression tting on
the switch.
2. Cut the exposed tubing on the CAS-4 as shown in Figure 2. Install the provided plastic Tee and connect the tubing
from the CAC-24 to the Tee.
Figure 2
Figure 1

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© Field Controls, LLC P/N 46140800 Rev E 04/15
WARRANTY
For warranty about this or any Field Controls product, visit:
www.fieldcontrols.com/warranty