Field Controls SWG-3 Product Manual page 25

COMBUSTION AIR SYSTEMS
COMBUSTION AIR SOLUTIONS FOR ANY APPLICATION
These models are designed to provide combustion air for appliances when direct connection to the
burner is not possible (when the appliance is located in a confined space). According to NFPA 54
and NFPA 31, an engineered system such as a CAS-34U, 4, 6, or 7 may be used to overcome the
lack of air in a confined space. The CAS-3 is designed for use with oil appliances. The CAS-34U
is for use with gas appliances with 24 VAC gas valve controls. Each is designed for optimum safety
and includes a proving device that won't allow the burner to engage without the Fan-in-a-Can®
operating. Multiple units or additional controls are required for multiple appliance installations. Each
is equipped with a two-speed control for enhanced versatility. The Fan-in-a-Can, Jr. is designed for
gas appliances up to 110,000 BTU/hr input. It may be used with a residential water heater with the
addition of control kit CK-20 FV/FG.
HOW THE CAS-34U WORKS
When the thermostat calls for heat, the CAS-34U Fan-in-a-Can ® engages and begins drawing air into the
structure. When airflow is established, the pressure switch closes. The CAS sends a signal to the appliance,
allowing the burner to fire. The Fan-in-a-Can ® diffuses the outside air into the room near the burner to
ensure adequate air for efficient combustion.
24
MODEL FUEL APPLICATION
ANY OIL HEATING
APPLIANCE 120V
OIL/
CAS-34U
GAS
24V GAS
APPLIANCE
BOILER WITH
CAS-34UP
GAS AUTOMATIC VENT
DAMPER
24V GAS
CAS-4JR.
™ GAS
APPLIANCE
CAS-34U
APPLIANCE
COMPONENTS
INPUT
4" Intake Air Hood
Fan-in-a-Can
®
SEE SPECIFICATIONS
6" to 4" Reducer
Restrictor Plate
4" Intake Air Hood
Fan-in-a-Can ®
SEE SPECIFICATIONS
6" to 4" Reducer
Restrictor Plate ADA-1
4" Intake Air Hood
SEE SPECIFICATIONS
Fan-in-a-Can ®
Customer Service: 252.522.3031
CAS-4Jr.™