www.fi eldcontrols.com
Please retain these instructions after installation.
This device MUST be installed by a qualifi ed agency in accordance with the manufacturer's installation instructions. The defi nition of
a qualifi ed agency is: any individual, fi 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 SYSTEM
MODEL: CAS-4
This product is designed for use with any natural gas or LP burning furnace, water heater, or boiler with a 24
VAC control system. The CAS-4 may be used with one 24V-controlled combustion heating appliance and one
30mV standing-pilot gas water heater with the use of an additional CK-20 series control kit. Additional 120V or
24V-controlled appliances may also be served by the CAS-4 with the addition of one CAC-120 or CAC-24 control
kit per each additional appliance (see note)*. The CAS unit mechanically draws air into a structure and disperses it
near the combustion air intake of an appliance. Refer to Diagrams A and B for guidance in setting up the CAS
system based on the size and length of the connecting ductwork and the input rating of the appliance.
ITEMS INCLUDED IN KIT:
1- Motorized Blower
1- 4" galvanized intake air Vent Hood
2- Mounting brackets to secure the CAS to a wall
2- Wire/conduit connectors
1- 4" x 6" Pipe Increaser Fitting
1- 6" Orifi ce Ring
1- Instruction Sheet
1- High/Low Motor Speed Switch
P/N 46284600 Rev L 09/19
WARNING! CONNECTIONS TO MULTIPLE APPLIANCES MUST FOLLOW INSTALLATION INSTRUCTION
WARNING! CONNECTIONS TO MULTIPLE APPLIANCES MUST FOLLOW INSTALLATION INSTRUCTION
WIRING DIAGRAMS. FOR HELP CALL 1-800-742-8368.
WIRING DIAGRAMS. FOR HELP CALL 1-800-742-8368.
*NOTE: The model CAS-4 design has recently been changed. Please note that there are diff erences in construction,
operation, and installation of this CAS as compared to legacy product. Also, note that for multiple-appliance
installations, each additional appliance will require either a CAC-24 or CAC-120 control kit be provided for that
appliance. Installations with one heating appliance and one 30mV gas water heater will require an additional CK-20
series control kit in addition to the CAS-4.
