Ratings, Gold cgi gas-fired water boiler — boiler manual – Weil-McLain GOLD CGI 550-110-710/0107 User Manual
Page 67
Part Number 550-110-710/0107
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GOLD CGi Gas-Fired Water Boiler — Boiler Manual
Ratings
Table 10 Boiler ratings
DOE
13b
CGi boilers for residential radiant panel systems, converted gravity heating systems or other low water tempera-
ture 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. For alternate piping,
contact your Weil-McLain sales office. CSA design certified for installation on combustible flooring. Tested for
50 psi working pressure.
Boiler
model
number
DOE
Heating
capacity
(Btuh)
0–2,000 feet
altitude
2,000–4,500 feet
altitude
Net
I=B=R
ratings
(Btuh)
Boiler
water
content
(gallons)
DOE
Seasonal
efficiency
(% A.F.U.E)
Vent
size
Input
(Btuh)
Output
(Btuh)
Input
(Btuh)
Output
(Btuh)
(Note 1)
(Note 2)
(Note 3)
(Note 4)
CGi-25
42,000
50,000
42,000
45,000
38,000
37,000
1.5
84.0
3"
CGi-3
51,000
60,300
51,000
54,300
46,200
45,000
1.5
85.1
3"
CGi-4
85,000
100,000
85,000
90,000
76,000
74,000
2.1
84.0
3"
CGi-5
100,000
119,700
100,000
108,000
90,000
87,000
2.7
83.3
3"
CGi-6
140,000
167,000
140,000
150,000
126,000
122,000
3.3
83.3
3"
CGi-7
167,000
200,000
167,000
180,000
150,000
145,000
3.8
83.0
3"
CGi-8
194,000
233,000
194,000
210,000
175,000
169,000
4.4
82.7
3"
1. Add “PIN” for natural gas boiler - “PIL” for propane gas boiler.
Notes
2. Based on standard test procedures prescribed by the United States Department of Energy.
3. Net I=B=R 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.