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COMBUSTION AIR SYSTEM
This product is designed for use with any oil burning furnace, water heater, or boiler with 120 VAC control
systems. The CAS-3 may be used with one 120V-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-3 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 Diagram 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
2- Mounting Brackets to secure the CAS to a wall
1- 4" x 6" Pipe Increaser Fitting
1- Instruction Sheet
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-3 has recently been changed to comply with pending revisions to installation standard
NFPA-31. 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-3.
READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY BEFORE PROCEEDING WITH THE 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.
Installed By:
Model: CAS-3
Please retain these instructions after installation.
Phone:
www.fi eldcontrols.com
1- 4" galvanized intake air Vent Hood
2- Wire/Conduit connectors
1- 6" Orifi ce Ring
1- High/Low Motor Speed Switch
Installation Date:
P/N 46261200 Rev M 09/19
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Table of Contents
Related Manuals for Field Controls CAS-3
Summary of Contents for Field Controls CAS-3
- Page 1 CK-20 series control kit. Additional 120V or 24V-controlled appliances may also be served by the CAS-3 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.
- Page 2 (THIS PAGE LEFT INTENTIONALLY BLANK) page 2 of 12 P/N 46261200 Rev M 09/19...
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Page 3: General System Operation
GENERAL SYSTEM OPERATION 1. The thermostat (wall thermostat, or aquastat) calls for heat and energizes a relay which activates the CAS unit. After the CAS fan has come up to speed and air fl ow into the CAS inlet is established, an internal air pressure switch closes and completes the circuit to allow the burner to fi re. - Page 4 4" x 6" Increaser on top of the CAS. Table 1 TOTAL INPUT OF MAXIMUM EQUIVALENT FEET OF INSTALLATION APPLIANCE 4" Duct And Hood w/ 4" Duct And 4" 6" Duct And 6" CAS-3 Restrictor Intake Air Hood Intake Air Hood Oil (gph) 0.50 0.75 0.90 1.00...
- Page 5 Diagram A LOW SPEED SIZING CHART OIL INPUT FIRING RATE (gallons per hour) (1 gallon oil/hr = 140,000 BTU/hr.) 0.50 1.00 1.50 2.00 2.50 6" Duct & Hood 4" Duct & Hood 4" Duct & Hood w/ Orifice GAS INPUT FIRING RATE (1000 BTU/hr.) Diagram B page 5 of 12 P/N 46261200 Rev M 09/19...
- Page 6 INSTALLATION PLACEMENT OF THE CAS UNIT The motorized CAS unit should be located on a fl at horizontal surface within the space of the appliance or appliances, and try to be within 3' of the combustion air intake of the appliance. Two mounting brackets are provided for securing the unit against a solid structure, such as a wall, column, or the side of the appliance itself.
- Page 7 The references to various series of control kits implies that any kit in that series may be used.If further information or additional wiring diagrams are needed please consult Field Controls’ technical support. WARNING! CONNECTIONS TO MULTIPLE APPLIANCES MUST FOLLOW INSTALLATION INSTRUCTION WARNING! CONNECTIONS TO MULTIPLE APPLIANCES MUST FOLLOW INSTALLATION INSTRUCTION WIRING DIAGRAMS.
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Page 8: External Wiring Connections
EXTERNAL WIRING CONNECTIONS Refer to Figures 4-7 for appropriate wiring method. Figure 4- Chimney Vent Single Oil Fired System Figure 5- Riello Oil Fired System page 8 of 12 P/N 46261200 Rev M 09/19... - Page 9 Figure 6- Single Vent Oil Fired System page 9 of 12 P/N 46261200 Rev M 09/19...
- Page 10 Figure 7- Chimney Vent Two Oil Fired System with CAC-120 page 10 of 12 P/N 46261200 Rev M 09/19...
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Page 11: Maintenance
If in doubt, please consult the Field Controls Technical Support at 1-800-742-8368. ITEM DESCRIPTION FIELD PART NUMBER Motorized Fan 46274100 Switch Pressure Fxd CAS-4TMR 511100200 120 VAC Relay for CAS-3 46257300 page 11 of 12 P/N 46261200 Rev M 09/19... -
Page 12: Warranty
This manual may be downloaded and printed from the Field Controls website (www.fi eldcontrols.com) This manual may be downloaded and printed from the Field Controls website (www.fi eldcontrols.com) WARRANTY WARRANTY For warranty information about this or any Field Controls product, visit: For warranty information about this or any Field Controls product, visit: www.fi eldcontrols.com...