Boiler Ratings And Capacities; Boilers For Use At High Altitude - Dunkirk PVWB Installation Instructions Manual

FIG. 1
BASIC BOILER UNIT NO.
Electronic Ignition Continuous Pilot
With
Vent Damper
PWB-2D
PWB-3D
PWB-4D
PWB-5D
PWB-6D
PWB-7D
PWB-8D
PWB-9D
* MBH = 1,000 Btuh = British Thermal Unit Per Hour
Boilers are equipped for altitudes up to 2,000 feet only
U.S.A. Only - For altitudes above 2,000 feet, ratings should be reduced at the rate of 4% for each 1,000 feet above sea level.
Canada Only - Boilers may be used at high altitude by using a certified field conversion kit, resulting in a 10% derate.
+ Heating Capacity based on D.O.E. (Department of Energy) test procedure. Add 5½" to height when vent damper is used.
‡ 2 section boilers are equipped with a 3" diameter flue collar on the draft diverter, and use a furnished 3" x 4" increaser fitting to install
the furnished 4" vent damper.
New York City MEA Number 39-86-E Vol. IV.
The Ratings marked "Net 1=B=R Ratings" indicate the amount
of remaining heat input that can be used to heat the radiation
or terminal units. The Net 1=B=R Ratings shown are based on
an allowance of 1.15 in accordance with the factors shown on
the 1=B=R Standard as published by The Hydronics Institute.
Selection of boiler size should be based upon "Net 1=B=R
Rating" being equal to or greater than the calculated heat loss
of the building.
The manufacturer should be consulted before selecting a boiler
for installations having unusual piping and pickup requirements.
These boilers must stand on a non-combustible floor. If in

Boiler Ratings and Capacities

GAS-FIRED HOT WATER BOILERS
NO. OF
With SECTIONS
Vent Damper
PVWB-2D 2
PVWB-3D 3
PVWB-4D 4
PVWB-5D 5
PVWB-6D 6
PVWB-7D 7
PVWB-8D 8
PVWB-9D 9
NATURAL AND PROPANE GAS
AGA/CGA HEATING NET I=B=R
INPUT CAPACITY
*MBH *MBH
37.5 30
70 57
105 85
140 113
175 142
210 170
245 198
280 226
stalled on a combustible floor, use Combustible Floor Base
Number 42135-1 or 146-14-031 (2-6 section boilers) or
42135-2 or 146-14-032 (7-9 section boilers).

BOILERS FOR USE AT HIGH ALTITUDE

This boiler is factory equipped for use at altitudes of 0-2,000
feet above sea level. For use at altitudes above 2,000 feet
above sea level, the input ratings are reduced by a change in
main burner orifice size.
U.S.A. Only
- For altitudes above 2,000 feet above sea
level, input ratings should be reduced at the rate of 4% for
each 1,000 feet above sea level. Consult the National Fuel
2
DIMENSIONS
(Inches)
RATING FLUE
*MBH DIAMETER WIDTH
26 4‡
50 5
74 6
98 6
123 7
148 7
172 7
197 7
"A"
8
11¼
14½
17¾
21
24¼
27½
30¾