Specification

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Combustion
Combustion Air Systems
Installation Specifications
Total Input of Appliance(s) Max. Equivalent Feet of Installation
CAS-3 OIL CAS-4, 4mV, 4P, 4TMR GAS
4" duct & hood
w/ Restrictor
4" duct & 4" hood 6" duct & 6" hood
(gph) (BTU/hr) HI LOW HI LOW HI LOW
- 50,000 300 300 300 300 300 300
.50 75,000 300 300 300 300 300 300
.75 100,000 300 300 300 300 300 300
.90 125,000 300 220 300 220 300 300
1.00 150,000 174 108 232 118 300 300
1.25 175,000 99 48 152 63 300 300
1.35 200,000 52 14 102 32 300 300
1.55 225,000 20 NA 68 13 300 239
1.75 250,000 NA NA 45 NA 300 150
2.00 300,000 NA NA 16 NA 300 53
2.50 350,000 NA NA NA NA 193 8
2.75 400,000 NA NA NA NA 109 NA
3.25 450,000 NA NA NA NA 56 NA
Model Description
CK-20FV
Additional 30mV gas water heater control for use with CAS-4, CAS-4Jr., and CAS-4TMR
CAC-24
Additional 24 Volt appliance for use with CAS-4, CAS-4Jr., CAS-4TMR, CAS-6, and CAS-7
CAC-120
Additional 120 Volt appliance for use with CAS-3, CAS-6, and CAS-7
For multiple appliances, the following additional controls should be used:
Installation Specifications for CAS-4Jr.™
Total Input of Appliance(s) Maximum Equivalent Feet of Duct Pipe
BTU/hr 4" Pipe 5" Pipe 6" Pipe
50,000 230 300 300
60,000 160 300 300
70,000 105 300 300
80,000 70 214 300
90,000 40 122 300
100,000 25 76 180
110,000 15 46 80
CAS-4Jr.™