Install Instructions
Part Number 550-142-902/1016
CGi
GAS-FIRED WATER BOILER — SERIES 3 — 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
50,000 42,000 45,000 38,000 42,000 84.0 37,000 1.5 3"
CGi-3
60,000 51,000 60,000 51,000 51,000 85.1 45,000 1.5 3”
CGi-4
90,000 76,000 81,000 68,400 76,000 85.0 66,000 2.1 3”
CGi-5
119,000 100,000 120,000 101,000 100,000 83.3 87,000 2.7 3”
CGi-6
167,000 140,000 150,000 126,000 140,000 83.3 122,000 3.3 3”
CGi-7
200,000 167,000 180,000 150,000 167,000 83.0 145,000 3.8 3”
CGi-8
233,000 194,000 210,000 175,000 194,000 82.7 169,000 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 boiler. 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.
CGiboilersforresidentialradiantpanelsystems,convertedgravityheatingsystemsorotherlowwater
temperature applications should be installed with balancing valves and bypass piping equal to the supply
andreturnsizetoavoidexcessiveuegascondensationduetoloweroperatingwatertemperatures.CSA
design certified for installation on combustible flooring. Tested for 50 psi working pressure.
Table 11 Boiler ratings