Overview of Primary Product

ManualsBrandsField Controls ManualsBoiler Venting24v Relay (used w/ CAS-4, CAS-4Jr, CK-81)

2630 Airport Road · Kinston, NC 28504

Phone: 252-522-3031· Fax: 252-522-0214

www.fieldcontrols.com

COMBUSTION AIR SYSTEM

Model: CAS-4JR

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

residential water heater 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.

Refer to Diagram A and Table 1 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.

DO NOT DESTROY

THESE INSTRUCTIONS MUST REMAIN WITH EQUIPMENT

ITEMS INCLUDED IN KIT:

1) CAS fan unit

1) 4" galvanized intake air Vent Hood

2) Mounting brackets to secure the CAS to a wall

2) Wire/conduit connector(s)

1) Instruction Sheet

Summary of content (12 pages)

PAGE 1
COMBUSTION AIR SYSTEM Model: CAS-4JR ITEMS INCLUDED IN KIT: 1) CAS fan unit 1) 4" galvanized intake air Vent Hood 2) Mounting brackets to secure the CAS to a wall 2) Wire/conduit connector(s) 1) Instruction Sheet 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 residential water heater with additional hardware. It may also be used with more than one appliance.
PAGE 2
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. After the CAS comes up to speed, a pressure switch in the unit closes and allows the appliance to fire. 2.
PAGE 3
Table 1 Total Input of Appliance Maximum Equivalent Feet of Duct Pipe (BTU/hr) 4” Pipe 5” Pipe 6” Pipe 50,000 60,000 70,000 80,000 90,000 100,000 110,000 230 160 105 70 40 25 15 300 300 300 214 122 76 46 300 300 300 300 300 180 80 CAS-4JR SIZING CHART 300 280 260 Max. Eqivalent Duct Length, feet 240 Max. equivalent length of 6" pipe available when using the 4" CAS hood 220 200 180 Max.
PAGE 4
INSTALLATION PLACEMENT OF THE CAS UNIT 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. Use the included screws to attach the brackets to the CAS housing as shown in Figure 2.
PAGE 5
WIRING INSTRUCTIONS Wire the CAS unit in accordance with the National Electric Code and applicable local codes. UNIT MUST BE GROUNDED. Check the ground circuit to make certain that the unit has been properly grounded. The wiring should be protected by an over-current circuit device rated at 15 amperes. CAUTION must be taken to ensure that the wiring does not come in contact with any heat source.
PAGE 6
Figure 5 – Power Vent Single 24V Furnace Figure 6 – Chimney Vent 24V Furnace and 30mV Water Heater with CK-20FV or CK-20FG Page 6
PAGE 7
Figure 8 – Power Vent Single 24V Boiler Figure 7 – Chimney Vent 24V Boiler Page 7
PAGE 8
Figure 9 – Chimney Vent 24V Boiler or Water Heater with Automatic Damper using ADA-1 Adapter Harness Figure 10 – Water Heater or Boiler with 24V Automatic Damper and CAS-4 with Power Venter, Using two ADA-1 Adapters Page 8
PAGE 9
MAINTENANCE 1. Inspect the system annually to ensure proper operation by observing that the fan activates when a call for heat occurs and deactivates when the call for heat is satisfied. 2. Disconnect power to the CAS unit and repeat Step 1. Note: The unit should not run and the appliance should not fire in this condition. 3. Inspect the duct pipe for cracks and security to the CAS unit and vent hood. 4. Clear any obstructions, if present, from the inlet of the vent hood and the outlet of the CAS unit. 5.
PAGE 10
REPLACEMENT PARTS The following items are available for replacement, if needed. In order to replace these parts, power must be disconnected and the unit must be partially disassembled. 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.
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Limited Warranty Field Controls, L.L.C. warrants that the following Field Controls, L.L.C. products sold hereunder, shall be free from defects in material and workmanship under normal use for eighteen (18) months from date of manufacturing by the consumer excepting the provisions numbered below. Provisions: 1. 2. 3. 4. 5. Field Controls shall have no obligation in the event the customer is unable to provide receipt showing the date the customer purchased the product(s) or accurate date code information.