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Ratings
AHRI Rating
Model Number
Note: Change "N" to
(Notes 4 - 8)
"L" for L.P. gas models.
Min
FB(N,L)1500
60
FB(N,L)2000
80
FB(N,L)2500
125
FB(N,L)3000
150
FB(N,L)3500
200*
FB(N,L)4000
335
FB(N,L)5000
500
*For LP models the minimum input is 420 MBH.
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.
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 Models 1.5, 2.0, 2.5, 3.0 and 3.5
boilers are equipped to operate from 3,000 to 12,000
feet and high altitude Crest Models 4.0 and 5.0 boilers
are equipped to operate from 3,000 to 5,500 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. Standard Crest boilers will de-rate by 2.2% for each 1,000
feet above sea level up to 4,500 feet when combustion
calibration is performed and CO
recommended levels.
6
Crest
Gross
Input
Output
MBH
MBH
(Note 1)
Max
1500
1380
2000
1840
2500
2300
3000
2760
3500
3220
4000
3720
5000
4650
Use only
's are adjusted to the
2
Installation & Operation Manual
Other Specifications
Net
AHRI
Appliance
Pipe
Ratings
Water
Size
Water,
Content
Outlet
MBH
Gallons
(Note 2)
1200
96
4"
1600
132
4"
2000
161
4"
2400
181
4"
2800
215
4"
291
4"
4043
380
4"
3235
7. High altitude Crest Models 1.5, 2.0, 2.5, 3.0 and 3.5 will
de-rate by 1.4% for each 1,000 feet above sea level up to 5,500
feet and 1.8% for each 1,000 feet above 5,500 feet.
8. High altitude Crest Models 4.0 and 5.0 will not de-rate up to
5,500 feet.
9. For Crest Models 4.0 and 5.0, installations above 5,500 feet
contact the factory.
10. 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
Vent
Size
Pipe
Air
Gas Inlet
Size
Size
Size
Inlet
(Note 3)
4"
1 1/2"
7"
7"
4"
1 1/2"
8"
8"
4"
2"
8"
9"
4"
2"
10"
10"
4"
2"
10"
10"
4"
2 1/2"
12"
12"
4"
2 1/2"
14"
14"
Weight
w/Water
(lbs.)
2500
3055
3650
4125
4750
6500
8000
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