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This product is designed for use with any natural gas or LP burning furnace,
water heater, or boiler with a 24 VAC control system. It may be used with a
millivolt powered system with additional hardware. It may also be used with
more than one appliance. The CAS unit mechanically draws air into a
structure and disperses it near the combustion air intake of an appliance. If an
optional Vacuum Relief Valve (VRV) is used, the incoming air is tempered
before entering the structure's airspace. Refer to Diagram A and B for
guidance in setting up the CAS system based on the size and length of the
connecting duct-work and the input rating of the appliance.
This device MUST be installed by a qualified agency in accordance with the manufacturers installation
instructions.
The definition of a qualified agency is: any individual, firm, corporation or company which either in person or through a
representative is engaged in, and is responsible for, the installation and operation of gas appliances, who is experienced
in such work, familiar with all the precautions required, and has complied with the requirements of the authority having
jurisdiction.
COMBUSTION AIR SYSTEM
Model: CAS-4
DO NOT DESTROY
THESE INSTRUCTIONS MUST REMAIN WITH EQUIPMENT
I
TEMS 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 connector(s)
1) 4" x 6" Pipe Increaser Fitting
1) 6" Orifice Ring
1) Instruction Sheet
1) High/Low Motor Speed Switch
2630 Airport Road · Kinston, NC 28504
2630 Airport Road · Kinston, NC 28504
Phone: 252-522-3031· Fax: 252-522-0214
Phone: 252-522-3031· Fax: 252-522-0214
www.fieldcontrols.com
www.fieldcontrols.com
:
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Table of Contents
Related Manuals for Field Controls 46284600
Summary of Contents for Field Controls 46284600
- Page 1 COMBUSTION AIR SYSTEM Model: CAS-4 TEMS 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 connector(s) 1) 4" x 6" Pipe Increaser Fitting 1) 6" Orifice Ring 1) Instruction Sheet 1) High/Low Motor Speed Switch This product is designed for use with any natural gas or LP burning furnace,...
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Page 2: 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, an internal air pressure switch closes and completes the circuit to allow the burner to fire. If the appliance is power vented, the venter and CAS activate simultaneously. - Page 3 8. Draw a horizontal line on Diagram A or B that passes through the point located in step 5. The position of the point along this line relative to the left and right borders of the region it falls into indicates the relative position that the balance weight of the VRV should be adjusted to.
- Page 4 HIGH SPEED SIZING CHART OIL INPUT FIRING RATE (gallons per hour) (1 gallon oil/hr = 140,000 BTU/hr) 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 6" Duct & Hood 4" Duct & Hood 4" Duct, Hood, & Orifice GAS INPUT FIRING RATE (1000 BTU/hr.) Diagram A LOW SPEED SIZING CHART OIL INPUT FIRING RATE (gallons per hour)
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Page 5: Installation
INSTALLATION CAS U LACEMENT OF THE The motorized CAS unit should be located on a flat horizontal surface within the same space as that3 feet of the appliance and within 3 feet of the combustion air intake as possible. 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: Wiring Instructions
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. CAS U... - Page 7 Figure 6 – Power Vent Single 24V Furnace Figure 7 – Chimney Vent 24V Furnace and 30mV Water Heater with CK-20FV or CK-20FG Page 7...
- Page 8 Figure 9 – Power Vent Single 24V Boiler Figure 8 – Chimney Vent 24V Boiler Page 8...
- Page 9 Figure 10 – Chimney Vent Two 24V Gas Appliances With CAC-24 Page 9...
- Page 10 Figure 11 – One Power Venter Two 24V Gas Appliances With DIP-1 Page 10...
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Page 11: Maintenance
If this is necessary, take note of the positions and locations of whatever items that may need to be removed to replace other items. If in doubt, please consult the Field Controls Technical Support at 1-800-742-8368. Item Description... - Page 12 Page 12 PN 46284600 Rev G 10/06...