Specification

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Combustion Air Systems
Combustion
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-3, 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-4
is for use with gas appliances with 24 VAC gas valve controls. The CAS-4MV is
for use with 750mV power pile gas appliances. 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 CAS-4TMR is designed for use with natural gas or LP gas fired boilers equipped with
a 24 VAC vent damper control system. The CAS-4TMR mechanically draws air into a boiler
room and disperses it near the boiler combustion air intake, and is interlocked with the
boiler gas valve control by means of the boiler’s vent damper control cable.
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-3, CAS-4, and CAS-4TMR work
Model Fuel Application Appliance Input Components
CAS-3
Oil
Any oil heating
appliance 120V
See
Specifications
4" Intake Air Hood
Fan-in-a-Can
®
6" to 4" Reducer
Restrictor Plate
CAS-4
Gas 24V Gas Appliance
See
Specifications
4" Intake Air Hood
Fan-in-a-Can
®
6" to 4" Reducer
Restrictor Plate
CAS-4MV
Gas
750mV Power Pile
Gas Appliance
CAS-4P
Gas
Boiler with
automatic vent
damper
See
Specifications
4" Intake Air Hood
Fan-in-a-Can
®
6" to 4" Reducer
Restrictor Plate ADA-1
CAS-4Jr.
™
Gas 24V Gas Appliance
See
Specifications
4" Intake Air Hood
Fan-in-a-Can
®
CAS-4TMR
Gas 24V Gas Appliance
See
Specifications
4” Intake Air Hood
6” to 4” Reducer
ADA-2 damper adapter
(no restrictor plate)
When the thermostat calls for heat, the CAS-3 and CAS-4 Fan-in-a-Can
®
engages and begins drawing air into the
structure. When air flow 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. The CAS-4TMR has a differential pressure switch that eliminates the need for a flow switch in areas that
require air flow proving. The CAS-4TMR also includes an interval shut-off timer
designed to reduce the risk of freeze-up in the event of boiler ignition failure,
and a “plug-’n-play” modular damper adapter for use with boilers having an
automatic vent damper, greatly simplifying control wiring connections.
CAS-4Jr.™
Combustion Air Solutions for any Application
CAS-3