Lennox COWB2 User Manual

3
These low pressure oil red hot water boilers
are constructed and hydrostatically tested for a
maximum working pressure of 50 psig (pounds
per square inch gage) in accordance with A.S.M.E.
(American Society of Mechanical Engineers) Boiler
and Pressure Vessel Code Section IV Standards
for heating boilers.
The Heating Capacity indicates the amount of
heat available after subtracting the losses up the
stack. Most of this remaining heat is available to
heat water. A small portion is heat from the jacket
and surfaces of the boiler and it is assumed that
this heat stays in the structure. The Net I=B=R
Rating represents the portion of the remaining
heat that can be applied to heat the radiation or
terminal units (i.e. nned tube baseboard, cast
iron radiators, radiant oor, etc.). The difference
between the Heating Capacity and the Net I=B=R
Rating, called the piping and pickup allowance,
establishes a reserve for heating the volume of
water in the system and offsetting heat losses from
the system piping. The Net I=B=R Ratings shown
are based on a piping and pickup factor of 1.15 in
accordance with the I=B=R Standard as published
by the Hydronics Institute. The Net I=B=R Rating
of the boiler selected should be greater than or
equal to the calculated peak heating load (heat
loss) for the building or area(s) served by the
boiler and associated hot water heating systems.
The manufacturer should be consulted before
selecting a boiler for installations having unusual
piping and pickup requirements.
Boilers with the same number of sections are iden-
tical to each other except for their ring rate. The
ring rate is determined by the nozzle size in the
oil burner and the oil pressure at the nozzle. For
example: Models 3E.65Z, 3E.75Z, and 3EI.00Z
are the same boiler, without a tankless coil, except
for the ring rate of the oil burner.
Each boiler rating plate shows three possible
model numbers for a given boiler conguration.
The actual model number is determined by the
ring rate of the oil burner. Boilers that are factory
packaged include two nozzles for two ring
rates. These boilers operate on #2 Heating
Oil. This re rate does not come with addi-
tional nozzles or heads for the burner. The 3
& 4 section units are packaged with two nozzles.
They can be eld converted to low re rates by
utilizing the low re kit.
BOiler raTiNgs aNd CapaCiTies

Lennox COWB2 Specifications

General

Brand	Lennox
Model	COWB2
Category	Boiler
Language	English