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6
Installation & Operation Manual
Ratings
Crest
AHRI Rating
Model Number
Note: Change “N” to
“L” for L.P. gas models.
Input
MBH
(Notes 4 - 6)
Min Max
Gross
Output
MBH
(Note 1)
Net
AHRI
Ratings
Water,
MBH
(Note 2)
FB(N,L)0751 50 750 720 626
FB(N,L)1001 50 1000 960 835
FB(N,L)1251 62 1250 1200 1043
FB(N,L)1501 60 1500 1440 1252
FB(N,L)1751 70 1750 1680 1460
FB(N,L)2001 80 2000 1920 1670
Other Specifications
Appliance
Water
Content
Gallons
Pipe
Size
Outlet
Pipe
Size
Inlet
Gas Inlet
Size
Air
Size
Vent
Size
(Note 3)
Weight
w/Water
(lbs.)
73 3" 3" 1 1/4" 6" 6" 1768
77 3" 3" 1 1/4" 6" 6" 1838
87 3" 3" 1 1/4" 6" 8" 1975
94 4" 4" 1 1/2" 8" 8" 2307
106 4" 4" 1 1/2" 8" 8" 2458
111 4" 4" 1 1/2" 8" 8" 2570
Maximum allowed working pressure is located on the rating plate.
NOTICE
Notes:
1. The ratings are based on standard test procedures
prescribed by the United States Department of Energy.
2. 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.
3. Crest boilers require special gas venting. Use only
the vent materials and methods specified in the Crest
Installation and Operation Manual.
4. Standard Crest boilers are equipped to operate from sea
level to 4,500 feet only. The boiler will de-rate by 1.4%
for each 1,000 feet above sea level up to 4,500 feet.
5. High altitude Crest Models are equipped to operate from
3,000 to 12,000 feet only. e boiler will not de-rate up
to 5,500 feet and will de-rate by 1.6% for each 1,000 feet
above 5,500 feet. e operation given in this manual
remains the same as the standard boilers. A high altitude
label (as shown in FIG A.) is also a xed to the unit.
De-rate values are based on proper combustion
calibration and
CO
2
’s adjusted to the recommended
levels.
UNIT EQUIPPED FOR
HIGH ALTITUDE
3,000 FT. TO 12,000 FT.
IMG01026
Figure A High Altitude Label Location