Boiler Ratings And Capacities; Boilers For Use At High Altitude - ECR Dunkirk PWB Series Manual

BASIC BOILER UNIT NO.
Electronic Ignition
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
(1)
** Add 5½" to height for vent Damper.
For altitudes above 2,000 ft. rating should be reduced at the rate of 4% for each 1,000 ft. above sea level.
(2)
Heating Capacity is based on D.O.E. (Department of Energy) test procedure.
(3)
Net I=B=R Water rating shown based on piping and pickup allowance of 1.15. Consult manufacturer before selecting
(4)
boiler for installations having unusual piping and pickup requirements, such as intermittent system operation,
extensive piping systems, etc.
2 Section boiler equipped with 3" diameter fl ue collar. Use 3" x 4" increaser fi tting to install furnished 4" vent damper.
(5)
Ratings marked "Net I=B=R Ratings" indicate amount
of remaining heat input that can be used to heat the
radiation or terminal units. Net I=B=R Ratings shown
are based on allowance of 1.15 in accordance with
factors shown on the I=B=R Standard as published by
The Hydronics Institute.
Selection of boiler size should be based upon "Net
I=B=R Rating" being equal to or greater than
calculated heat loss of the building.
Consult manufacturer before selecting boiler for
installations having unusual piping and pickup
requirements.
These boilers must stand on non-combustible fl oor. If
installed on combustible fl oor, 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).

BOILER RATINGS AND CAPACITIES

NATURAL AND PROPANE GAS RATINGS
Number
of
Continuous Pilot
Sections
With 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
Heating Net I=B=R
Input
Capacity
(1,2)
MBH
MBH (1,3)
37.5 30
70 57
105 85
140 113
175 142
210 170
245 198
280 226

BOILERS FOR USE AT HIGH ALTITUDE

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, input ratings are
reduced by change in main burner orifi ce size.
For altitudes above 2,000 feet above sea level, input
ratings should be reduced at rate of 4% for each
1,000 feet above sea level. Consult National Fuel
Gas Code (NFPA 54/ANSI Z223.1), or manufacturer
for correct orifi ce sizing information. High altitude
orifi ces are available from boiler manufacturer.
2
Dimensions (Inches)
Rating
Flue
MBH (1,4)
Diameter
26 4
3)
50 5
74 6
98 6
123 7
148 7
172 7
197 7
H
"A"
Width
8
11¼
14½
17¾
21
24¼
27½
30¾