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Ratings, High altitude, Crest ahri rating – Lochinvar Condensing Boiler 1.5 User Manual

Page 6: Other specifications, Installation & operation manual

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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. 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

2

’s are adjusted to the

recommended levels.

7. High altitude Crest boilers 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. 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.

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