Install Instructions

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Please retain these instructions after installation.

This device MUST be installed by a quali ed agency in accordance with the manufacturer's installation instructions. The de nition of

a quali ed agency is: any individual,  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-6, CAS-6SK, CAS-7, and CAS-7SK

This product is designed for use with any oil or gas  red furnace, water heater, or boiler with 24 VAC or

120 VAC control systems. It may also be used with millivolt water heaters and 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 Diagrams A & 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.

ITEMS INCLUDED:

1- CAS Unit (ETL Listed) "Fan-In-A-Drum"

1- Star Kap (only on SK Models)

2- Mounting Brackets for CAS Unit

2- Wire/Conduit connectors

1- 24VAC Control Relay (SPDT)

1- 120VAC Control Relay (SPDT)

Summary of content (12 pages)

PAGE 1
COMBUSTION AIR SYSTEM Model: CAS-6, CAS-6SK, CAS-7, and CAS-7SK This product is designed for use with any oil or gas fired furnace, water heater, or boiler with 24 VAC or 120 VAC control systems. It may also be used with millivolt water heaters and more than one appliance. The CAS unit mechanically draws air into a structure and disperses it near the combustion air intake of an appliance.
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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 will typically activate before the CAS unit. 2. After the heating requirement has been satisfied, the thermostat circuit will open and deactivate the burner and CAS unit. 3.
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Example: An oil fired appliance firing at 10.5 gph where a CAS-7 unit needs to be placed at a location requiring 80' of pipe from the StarKap, using two 90o elbows: From Diagram B, a vertical line is drawn through the point at 10.5 gph on the Oil Firing Rate scale. For 80 feet of 10" pipe, two 90 degree elbows, and two increaser/reducers, the equivalent length is 80 + 18 + 18 + 6 + 6 = 128' of equivalent length.
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D I A G RA M B C A S - 7 ( FA N + S T A R K A P S K - 1 2 ) S I Z I N G C H A RT M A X . EQ UI V A L EN T F EET O F P I P E O IL I NP U T F IR I NG R A T E, G P H 5 .7 6 .7 7 .7 8 .7 9 .7 1 0.7 1 1 .7 1 2.7 1 3 .7 2 0 0 .0 EQUIVALENT LENGTH OF PIPE (ft.) 14" PIPE 12" PIPE 1 7 5 .0 10 " PIPE 1 5 0 .0 1 2 5 .0 1 2 " DU C T 14" R EG IO N D U CT R EG IO N 1 0 " DU C T R EG IO N 1 0 0 .0 8" PIPE 7 5 .0 8 " DUCT 5 0 .0 R EG IO N 2 5 .0 0 .
PAGE 5
Table 1 MAXIMUM EQUIVALENT LENGTH OF PIPE, INCLUDING STARKAP® CAS-6 OIL (gph) CAS-6 GAS (BTU/hr) 8" duct 10" duct 12" duct 3 420,000 410 1253 3119 3.25 455,000 344 1051 2616 3.5 490,000 291 890 2217 3.75 525,000 249 760 1893 4 560,000 214 653 1627 4.25 595,000 185 584 1405 4.5 630,000 160 489 1217 4.75 665,000 139 424 1057 5 700,000 121 369 919 5.25 735,000 105 321 800 5.75 805,000 79 241 601 6 840,000 58 176 519 6.
PAGE 6
INSTALLATION PLACEMENT OF THE CAS UNIT The motorized CAS unit should be located on a flat horizontal surface near 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. Use the included screws to attach the brackets to the CAS housing as shown in Figure 1. Secure the brackets to a solid structure with appropriate fasteners.
PAGE 7
1. Remove the wiring access cover to access the wiring terminals. 2. Select the appropriate control relay for the appliance control system voltage from the two relays supplied with the CAS system (see illustration). Use the 24VAC relay for a 24V control system (typical gas-fired), or the 120VAC relay for a 120V control system (typical oil-fired). Install the selected relay into the socket provided on the wiring panel, and secure with the wire retaining clip. 3.
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Figure 6 Figure 7 Figure 8 page 8
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Figure 9 Figure 10 page 9
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Figure 11 Figure 12 page 10
PAGE 11
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 loose joints, damage, and security to the CAS unit and StarKap. 4.
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Warranty For warranty information about this or any Field Controls product, visit: www.fieldcontrols.com/warranty Phone: 252.522.3031 • Fax: 252.522.0214 www.fieldcontrols.