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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
(Note 4)
Min Max
Gross
Output
MBH
(Note 1)
Net
AHRI
Ratings
Water,
MBH
(Note 2)
FB(N,L)1500 60 1500 1380 1200
FB(N,L)2000 80 2000 1840 1600
FB(N,L)2500 125 2500 2300 2000
FB(N,L)3000 150 3000 2760 2400
FB(N,L)3500 200* 3500 3220 2800
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.)
96 4" 4" 1 1/2" 7" 7" 2500
132 4" 4" 1 1/2" 8" 8" 3055
161 4" 4" 2" 8" 9" 3650
181 4" 4" 2” 10" 10" 4125
215 4" 4" 2” 10" 10" 4750
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 with no adjustments.
5. High altitude Crest boilers are equipped to operate
from 3,000 to 12,000 feet. High altitude models are
manufactured with different control parameters for high
altitude operation, but the sequence of operation given
in this manual remains the same as the standard boilers.
A high altitude label (as shown in FIG A.) is also affi xed
to the unit.
6. The boiler will de-rate by 4% for each 1,000 feet above
sea level up to 4,500 feet and 4.5% for each 1,000 feet
above 4,500 feet.
7. Ratings have been confi rmed by the Hydronics Section
of AHRI.
UNIT EQUIPPED FOR
HIGH ALTITUDE
3,000 FT. TO 12,000 FT.
Figure A High Altitude Label Location
*For LP models the minimum input is 420 MBH.