Installation & Operation Manual
Ratings
Crest
AHRI Rating
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| Net |
Model Number | Input |
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| MBH |
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| Output | Ratings | |
Note: Change “N” to |
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| MBH | Water, |
(Note 4) |
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| MBH | ||
“L” for L.P. gas models. |
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| (Note 1) | (Note 2) |
| Min |
| Max |
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FB(N,L)1500 | 60 |
| 1500 | 1380 | 1200 | |
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FB(N,L)2000 | 80 |
| 2000 | 1840 | 1600 | |
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FB(N,L)2500 | 125 |
| 2500 | 2300 | 2000 | |
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FB(N,L)3000 | 150 |
| 3000 | 2760 | 2400 | |
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FB(N,L)3500 | 200* |
| 3500 | 3220 | 2800 | |
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*For LP models the minimum input is 420 MBH.
| Other Specifications |
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Appliance |
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| Vent | Weight |
Pipe | Pipe |
| Air | Size | w/Water | |
Water | Size | Size | Gas Inlet | Size |
| (lbs.) |
Content | Outlet | Inlet | Size |
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Gallons |
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| (Note 3) |
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96 | 4" | 4" | 1 1/2" | 7" | 7" | 2500 |
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132 | 4" | 4" | 1 1/2" | 8" | 8" | 3055 |
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161 | 4" | 4" | 2" | 8" | 9" | 3650 |
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181 | 4" | 4" | 2” | 10" | 10" | 4125 |
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215 | 4" | 4" | 2” | 10" | 10" | 4750 |
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NOTICE Maximum allowed working pressure is located on the rating plate.
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 affixed to the unit.
6.The boiler will
7.Ratings have been confirmed by the Hydronics Section of AHRI.
UNIT EQUIPPED FOR
HIGH ALTITUDE
3,000 FT. TO 12,000 FT.
Figure A High Altitude Label Location
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