Weil-McLain Gold CGi Series 2 User Manual page 63

Boiler Manual
13b
Ratings
Table 10 Boiler ratings
Boiler DOE
model Heating
number capacity
(Btuh)
(Note 1) (Note 2)
CGi-25 42,000
CGi-3 57,000
CGi-4 85,000
CGi-5 112,000
CGi-6 140,000
CGi-7 167,000
CGi-8 194,000
Notes
1
. Add "PIN" for natural gas boiler - "PIL" for propane gas
boiler.
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
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. For alternate piping, contact
your Weil-McLain sales office. CSA design certified for installation on combustible flooring. Tested for 50 psi
working pressure.
Part Number 550-110-710/0200
0–2,000 feet 2,000–4,500 feet
altitude
Input Output Input
(Btuh) (Btuh) (Btuh)
50,000 42,000 45,000
67,000 57,000 60,000
100,000 85,000 90,000
133,000 112,000 120,000
167,000 140,000 150,000
200,000 167,000 180,000
233,000 194,000 210,000
Net
altitude I=B=R
ratings
Output
(Btuh)
(Btuh)
(Note 3)
38,000 37,000
51,000 50,000
76,000 74,000
101,000 97,000
126,000 122,000
150,000 145,000
175,000 169,000
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.
Boiler DOE
water Seasonal
content efficiency
(gallons) (% A.F.U.E)
1.5 84.0
1.5 84.3
2.1 84.0
2.7 83.7
3.3 83.3
3.8 83.0
4.4 82.7
DOE
Vent
size
(Note 4)
3"
3"
3"
3"
3"
3"
3"
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