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Field Controls CAS-34U Manual

Combustion air system
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COMBUSTION AIR SYSTEM
CONNECTIONS TO MULTIPLE APPLIANCES MUST FOLLOW INSTALLATION INSTRUCTION WIRING DIAGRAMS.
CONNECTIONS TO MULTIPLE APPLIANCES MUST FOLLOW INSTALLATION INSTRUCTION WIRING DIAGRAMS.
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-34U
ITEMS INCLUDED IN KIT:
1 - Motorized Blower
2 - Mounting Brackets
1 - 4" x 6" Pipe Increaser Fitting
1 - Instruction Sheet
1 - 4" Intake Air Hood
1 - 6" Orifi ce Ring
WARNING
Please retain these instructions after installation.
Phone:
www.fi eldcontrols.com
Installation Date:
P/N 780107600 Rev B 05/23

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Summary of Contents for Field Controls CAS-34U

  • Page 1 COMBUSTION AIR SYSTEM Model: CAS-34U ITEMS INCLUDED IN KIT: 1 - Motorized Blower 2 - Mounting Brackets 1 - 4" x 6" Pipe Increaser Fitting 1 - Instruction Sheet 1 - 4” Intake Air Hood 1 - 6” Orifi ce Ring WARNING CONNECTIONS TO MULTIPLE APPLIANCES MUST FOLLOW INSTALLATION INSTRUCTION WIRING DIAGRAMS.

  • Page 2: Specifications

    The model CAS-34U is a combustion air system based on the CAS-3 and CAS-4 units. This product is designed for use with any oil, natural gas, or LP burning furnace, water heater, or boiler. The CAS-34U is a universal com- bustion air system that will operate with 120VAC or 24VAC control systems.

  • Page 3: General System Operation

    1. The thermostat (wall thermostat or aquastat) calls for heat which activates the CAS-34U unit. After the CAS-34U fan has come up to speed and air fl ow into the CAS-34U inlet is established, an internal air pressure switch closes and completes the circuit to allow the burner to fi re. If the appliance is power vented, the venter and CAS-34U activate simultaneously.
  • Page 4 TOTAL INPUT OF MAXIMUM EQUIVALENT FEET OF INSTALLATION APPLIANCE 6” Duct And 6” 4” Duct And 4” 4" Duct And Hood w/ Intake Air Hood Intake Air Hood Orifi ce Ring Oil (gph) Gas (BTU) 0.50 - 0.75 50,000-100,000 0.90 125,000 1.00 150,000...

  • Page 5: Installation

    INSTALLATION PLACEMENT OF THE CAS-34U UNIT The motorized CAS-34U unit should be located in a dry location 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 6: Installation Of Duct

    INSTALLATION OF DUCT Connect the duct pipe from the top of the CAS-34U unit to the Intake Air Hood in the wall. If using 4" diameter pipe attach the provided 4" x 6" Pipe lncreaser Fitting to the top of the CAS-34U unit. The duct should be supported with appropriate mounting straps from fl oor joists, walls, or other solid structures.
  • Page 7 OIL 120 VAC APPLIANCE SECTION The “M” terminal on this appliance is no longer directly connected to the unit’s motor. The “M” terminal’s function has been changed to a 120VAC input control circuit. EXTERNAL WIRING CONNECTIONS Refer to Figures 3 thru 6 for appropriate wiring method. Diagram A - Chimney Vent Single Oil Fired System Diagram B - Riello Oil Fired Boiler P/N 780107600 Rev B 05/23...
  • Page 8 Diagram C - Single Vent Oil Fired System P/N 780107600 Rev B 05/23 page 8 of 16...
  • Page 9 Diagram D - Chimney Vent Two Oil Fired System with CAC-120 P/N 780107600 Rev B 05/23 page 9 of 16...
  • Page 10 GAS 24 VAC APPLIANCE SECTION EXTERNAL WIRING CONNECTIONS Refer to Figures 7 thru 13 for appropriate wiring method. Diagram E - Chimney Vent Single 24V Furnace Diagram F - Power Vent Single 24V Furnace P/N 780107600 Rev B 05/23 page 10 of 16...
  • Page 11 Diagram G - Chimney Vent 24V Furnace and 30 mV Water Heater with CK-20FV and CK-20FG Set Voltage Selection Switch to 24V Diagram H - Wiring with a Smart Valve Water Heater P/N 780107600 Rev B 05/23 page 11 of 16...
  • Page 12 Diagram I - Chimney Vent 24V Boiler P/N 780107600 Rev B 05/23 page 12 of 16...
  • Page 13 Diagram J - Power Vent Single 24 Bolier P/N 780107600 Rev B 05/23 page 13 of 16...
  • Page 14 Diagram K -Chimney Vent Two 24V Gas Appliances with CAC-24 P/N 780107600 Rev B 05/23 page 14 of 16...
  • Page 15 Diagram L - One Power Venter Two 24V Gas Appliances P/N 780107600 Rev B 05/23 page 15 of 16...

  • Page 16: Maintenance

    3. Inspect the duct pipe for cracks and that it is secure to the CAS-34U unit and intake airhood. The CAS- 34U unit will not allow the appliance(s) to fi re if there is inadequate air fl ow into the inlet of the CAS-34U.

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