CGi Manual
Part Number 550-142-302/0520
CGi
SERIES 4 — GAS-FIRED WATER BOILER — Boiler Manual
70
Ratings
13b
AHRI Certified Ratings
Boiler
model
number
0 - 2,000 feet
Altitude
2,000 - 4,500 feet
Altitude
Heating
Capacity
Seasonal
Efficiency
Net
Ratings
(water)
Boiler
water
content
Vent
size
(Note 1)
Input
(Btuh)
Output
(Btuh)
Input
(Btuh)
Output
(Btuh)
Btuh
(Note 2)
AFUE %
Btuh
(Note
3)
Gallons
Inches
(Note 4)
CGi-25
48,000 40,000 43,000 36,000 41,000 84.0 35,000 1.5 3"
CGi-3
58,000 49,000 52,000 43,000 49,000 84.0 42,000 1.5 3”
CGi-4
90,000 76,000 81,000 68,000 77,000 84.0 66,000 2.1 3”
CGi-5
119,000 100,000 107,000 90,000 102,000 84.0 88,000 2.7 3”
CGi-6
158,000 133,000 142,000 119,000 135,000 84.0 117,000 3.3 3”
CGi-7
190,000 160,000 171,000 143,000 162,000 84.0 140,000 3.8 3”
CGi-8
222,000 186,000 200,000 168,000 189,000 84.0 164,000 4.4 3”
Notes
1. Add “PIN” for Natural gas boiler - “PIL” for Liquefied Petroleum (propane) gas boiler.
2. Based on standard test procedures prescribed by the United States Department of Energy.
3. Net AHRI ratings are based on net installed radiation of sufficient quantity for the requirements
of the building and nothing need be added for normal piping and pickup. Ratings are based on
a piping and pickup allowance of 1.15. An additional allowance should be made for unusual piping
and pickup loads.
4. CGi boilers require special venting, consistent with Category I, or III boilers. Use only the vent materials
and methods specified in this manual. Vent diameter shown above is for direct exhaust venting.
See Table 3, page 14, for vent diameter when chimney draft venting.
CGi boilers for residential radiant panel systems, converted gravity heating systems or other low water
temperature applications should be installed with balancing valves and bypass piping equal to the supply
and return size to avoid excessive flue gas condensation due to lower operating water temperatures. CSA
design certified for installation on combustible flooring. Tested for 50 psi working pressure.
Table 11 Boiler ratings