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TECHNICAL NOTES<br />
C.S.A. Input — Firing rate in BTU/hr. for atmospheric gas boilers<br />
based on C.S.A. certification test procedures.<br />
I=B=R Input — Firing rate in gallons per hour of oil or BTU/hr. of gas<br />
in accordance with Hydronics Institute test procedures.<br />
DOE Heating Capacity — Heat output of the boiler based on<br />
standard test procedures prescribed by the U. S. Department of Energy.<br />
Applies C.S.A. to boilers Grossunder Output 300,000 — Heat BTU/hr. outputinput.<br />
of the boiler based on tests<br />
conducted at the C.S.A. Laboratory. Applies to atmospheric gas boilers<br />
with I=B=R inputs of Gross 300,000 Output BTU/hr. — Heat and over. output of the boiler based on tests<br />
conducted in accordance with Hydronics Institute procedures. Applies<br />
to oil, Net gas I=B=R and gas-oil Ratings boilers — The with power DOE heating burners capacity, when the input C.S.A. is gross<br />
output, or I=B=R gross output less deductions for piping and pickup.<br />
Certified Ratings — Ratings when boiler is fired with special burners<br />
and/or under conditions other than stipulated by I=B=R code<br />
SELECTING THE BOILER<br />
Boilers should be selected based on the Net I=B=R rating when<br />
piping and pickup factors are considered normal. Net I=B=R ratings are<br />
shown in BTU/hr. for water & steam and in square feet of steam.<br />
To select residential boilers for gravity hot water systems, floor panel<br />
systems, hot water or steam systems with larger than normal piping and<br />
pickup factors, and replacement boilers on hot water or steam systems<br />
with old style radiation and large piping, the old I=B=R piping and pickup<br />
factors should be used. These older I=B=R factors will be approximated<br />
if the boiler size is increased about 15 percent. <strong>Weil</strong>-<strong>McLain</strong> shall have<br />
no liability for the selection of the appropriate boiler for the ultimate user.<br />
ASME CONSTRUCTION<br />
All <strong>Weil</strong>-<strong>McLain</strong> boiler sections meet the requirements of the ASME<br />
Boiler & Pressure Vessel Code, Section IV, Heating Boilers.<br />
DOMESTIC HOT WATER LOAD<br />
<strong>Weil</strong>-<strong>McLain</strong> boilers may be equipped to provide domestic hot water<br />
by using an indirect-fired water heater or tankless heater. The volume<br />
of domestic water produced depends upon the capacity of the heater<br />
and the firing rate of the boiler.<br />
For <strong>Weil</strong>-<strong>McLain</strong> indirect-fired water heaters, use <strong>Weil</strong>-<strong>McLain</strong> indirectfired<br />
water heater selection information for proper sizing.<br />
For tankless water heaters used in small and medium sized<br />
residences, where the demand for hot water is normal, an additional<br />
allowance is generally not required for domestic water heating in<br />
selecting the boiler. Domestic water heater sizes and capacities are<br />
listed for each boiler, and directions are given for figuring additional<br />
allowance in larger homes with more than two bathrooms.<br />
<strong>Weil</strong>-<strong>McLain</strong> Ratings for Tankless Heaters: Tankless heater ratings<br />
are determined from a series of tests in the respective boiler and based<br />
upon an intermittent draw schedule which allows a specific recovery<br />
period after each interval of a draw. The heater ratings in gallons per<br />
minute are expressed in average temperature rise of 100°F. and apply<br />
only to specific tankless heaters when used in specified boilers.<br />
FUELS<br />
Oil Firing: <strong>Weil</strong>-<strong>McLain</strong> boilers for oil firing are available for oil and<br />
for combination gas/oil. Oil fired ratings are based on boilers being fired<br />
at firing rates listed, burning oil with a heat content of 140,000 BTU’s per<br />
gallon. (150,000 BTU’s per gallon of heavy oil.)<br />
Gas Firing: <strong>Weil</strong>-<strong>McLain</strong> boilers for gas firing are available for<br />
atmospheric gas, power gas and combination gas/oil. Net ratings of<br />
these boilers when fired with gas are the same as those shown for oil,<br />
providing the draft conditions on the installation are comparable to those<br />
used for oil firing.<br />
RADIATION<br />
Baseboard Ratings: All <strong>Weil</strong>-<strong>McLain</strong> baseboards have approved<br />
I=B=R ratings expressed in BTU’s as shown in sales literature.<br />
ELEVATIONS ABOVE 2,000 FEET<br />
All ratings are based on elevations up to 2,000 feet. For atmospheric<br />
gas boilers at elevations above 2,000 feet, ratings should be reduced at<br />
the rate of 4 percent for each 1,000 feet above sea level. For oil or power<br />
gas heating units above 2,000 feet elevation, do not arbitrarily increase<br />
the boiler size; a larger burner may be required at additional cost.<br />
50 CYCLE OPERATION<br />
For heating units with burners operating on 50 cycle rather than 60<br />
cycle current, the rating should be reduced 20 percent, or the published<br />
rating can be used and a larger burner may be required. Consult your<br />
<strong>Weil</strong>-<strong>McLain</strong> representative for specific information.<br />
Now America’s #1 name in cast iron boilers offers homeowners an<br />
optional, extended 5 or 10 year warranty that covers parts and labor<br />
on <strong>Weil</strong>-<strong>McLain</strong> boilers and indirect-fired water heaters.<br />
What is the Plan?<br />
An exclusive <strong>Weil</strong>-<strong>McLain</strong> program that provides<br />
coverage for labor and/or defective parts<br />
furnished by <strong>Weil</strong>-<strong>McLain</strong> for up to 10 full years<br />
from date of installation.<br />
What does the Plan cover?<br />
The plan may be used to cover any <strong>Weil</strong>-<strong>McLain</strong> boiler up to<br />
600 MBH input or any indirect-fired water heater that is:<br />
o Less than one (1) year old<br />
o Used in a residential application<br />
How the Plan works:<br />
1.Installers need to sign up with the Plan administrator<br />
to participate<br />
(Call toll-free 1-800-824-5090 to sign up).<br />
2.Use the Plan to sell boilers & water heaters.<br />
3.Install the product(s) and sign up the homeowner<br />
(within one year of installation).<br />
4.Purchase the Plan contract.<br />
5.Repair the covered product if a problem occurs<br />
6.Submit your claim for parts and labor.<br />
7.Receive your check...it’s that easy!<br />
TPS #51 (0812) Page 75