Weil-McLain 550 MBH Nstallation And Operation Manual page 121

®
SlimFit Series 3
Ratings — SlimFit Series 3 boilers
Ratings and engineering data
Boiler CSA
Model Input
Number
Btuh
(Note 3)
SF-550 550,000
SF-750 750,000
AHRI Net ratings are based on net installed radiation of sufficient quantity for the requirements of the building and noth-
1 ing 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.
Combustion efficiency and thermal efficiency are based on AHRI testing procedure per BTS-2000.
2
Ratings shown are for sea level applications only. For altitudes above sea level, the SlimFit boiler requires no modifications
and automatically derates itself by approximately 4% per 1000 feet above sea level. For elevations over 5,500 feet, configure
3
the Control with HIGH ALTITUDE = YES.
SlimFit boilers can be direct vent or direct exhaust vented, either through a side wall or through roof, as instructed in this
manual and compliant with all local codes. SlimFit Boilers require special venting, consistent with Category IV boiler.
4
Category II, 8" venting requires 8" vent adapter, see pages 33-34.
Use only the vent materials and methods identified in this manual.
Part number 550-100-168/0516
COMMERCIAL CONDENSING GAS
DOE
AHRI Certified Ratings
Gross Net
Output Rating
Btuh Btuh
(Note 3) (Note 1)
517,000 450,000
702,000 610,000
-
FIRED WATER BOILER
Combustion Thermal
Efficiency Efficiency
% ( %
Note 2)
94.7
94.0
Notes
—
Boiler Manual
Boiler Vent/Air
Water Pipe Size
Content (inches)
Gallons
(Note 2)
93.9 5.5
93.6 6.5
(Note 4)
6 or 8
6 or 8
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