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The model CAS-34U is a combustion air system based on the CAS-3 and CAS-4 units. This product is designed
for use with any oil, natural gas, or LP burning furnace, water heater, or boiler. The CAS-34U is a universal com-
bustion air system that will operate with 120VAC or 24VAC control systems. The CAS-34U may also be used in
combination with a 30mV standing pilot gas water heater with the use of an additional CK-20 series control kit.
Additional 120V or 24V controlled appliances may also be served by the CAS-34U with the addition of one CAC-
120 or CAC-24 control kit (per each additional appliance, see note*.) The CAS-34U mechanically draws air into
the structure and disperses it near the combustion air intake of an appliance. Refer to Table 1 for guidance in set up
of the CAS-34U based on the size and length of the connecting ductwork and the input rating of the appliance(s).
*NOTE: This product will meet the NFPA-31 standard. Please note that there are di erences
in construction, operation and installation of this CAS as compared to legacy product.
SPECIFICATIONS
Internal motor 120VAC, 0.8A, 60Hz. Maximum loaded speed 2600 RPM
L1 terminal
Idle current at 120VAC: 18.25mA (no call for heat, no signal on M
terminal)
M terminal
input signal
120VAC, 5mA. Trigger voltage above 89.6VAC
Appliance: Oil, 120VAC nominal (voltage selection switch in the120VAC position)
T1 Minimum operating voltage 89.6VAC, drop out voltage 58.4VAC
T2 Must be connected to neutral in reference to T1 supply voltage
T1 & T3
Maximum Full Load Conditions: 120VAC, 60Hz, FLA 9.8A, LRA 58.8A
(1/2HP)
Appliance: Gas, 24VAC (voltage selection switch in the 24VAC position)
T1 Minimum operating voltage 18.75VAC, drop out voltage 13.8VAC
T2 Must be connected to 24VAC common in reference to T1 supply voltage
T1 & T3
Full load conditions 3.3A up to 5A. Typical gas appliance 3.3A or
less, Class II
Voltage
Selection Switch
Sets the desired voltage on the T1 terminal
P/N 780107600 Rev B 05/23
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