Burnham CHG150 User manual

Defining the Best in Home Heating
Natural or LP Gas
Water Only Boiler
94+% AFUE
ENERGY STAR® Certified
Cast Aluminum Heat Engine
Direct Vent Sealed Combustion
150 - 225 MBH (2 sizes)
Fully Modulating Firing Rates
Low NOx and CO Ratings
Condensing
High Efficiency
Gas Water Boiler

Burnham CHG condensing boilers
achieve 94+% efficiency through
our uniquely designed heat engines.
These sectional, cast aluminum
designs use the heat in the exhaust
gases from the boiler’s combustion
process to preheat the water as it
enters the boiler, thus capturing
energy that otherwise would be lost.
CHG “Condensing, High Efficiency, Gas” Boilers
Here at Burnham we are passionate about our products and want to help insure your family’s comfort with the
security of the Burnham Hydronics name. When you select Burnham, you’re buying more than just an appliance.
Every product is crafted with the highest quality materials and components – by experts committed to delivering
the absolute best performance. With Burnham products, you can count on the best craftsmanship, ingenuity, and
customer service and support that the industry has to offer.
Potential Annual Fuel Savings
by Increasing Efficiency
Example Savings for:
150,000 Btu Boiler
Gas price at $12.00/Mcf
NOTE - When determining potential savings, all of
these factors must be considered: (1) increased efficiency
rating over previous equipment , (2) new boiler BTU rating,
(3) cost of fuel, and (4) hours per day of full operation.
Defining the Best in Home Heating
Today’s lifestyles have created ever increasing demands for abundant supplies of comfortable space heating including radiant
heat, domestic hot water, and snow melting to keep walks and driveways clear – all with the best possible efficiencies available.
A condensing boiler can help ensure that all of these needs are met.
Burnham now offers the best solution for these demanding needs with a ruggedly designed, cast aluminum, condensing boiler
that has efficiency ratings exceeding 94+%. The CHG boiler will meet your family’s heating needs and save you money in energy
operating costs.
94+% Efficiency
When a condensing boiler is working at its peak efficiency,
the water vapor produced in the gas combustion process
condenses back into water – hence the name “condens-
ing” boiler. This condensation of exhaust gases releases
the latent heat that is given off when water is vaporized.
Together these two processes, condensation and vaporiza-
tion, create the high efficiencies associated with Burnham’s
CHG condensing boilers.
What is a “condensing” boiler?
Our CHG boilers are designed to automatically adjust the
firing rate to match your home’s heating needs. With up
to a 5-to-1 turn down ratio, a CHG boiler will continuously
adjust its output to more efficiently and effectively provide
the right amount of heat which further helps conserve fuel
and reduce heating costs.
Full Modulating Operation
Through its state-of-the-art design, packaging, and unique
combustion process, a CHG boiler operates so quietly
that you may not even “hear” it firing, but you can see its
operating sequence with a digital display mounted on the
top of the boiler.
The “Quiet” Boiler
CHG boilers use a sealed combustion system that isolates
the combustion process in the boiler from the air inside
your home. This design helps save energy dollars by using
outside air, rather than room air you’ve already paid to
heat, and assures that exhaust gases go directly outside.
In addition, the CHG boilers are designed to keep your
heating system running efficiently with Annual Fuel Uti-
lization Efficiencies (AFUE) of 94+% which can save you
hundreds of dollars on your annual heating bill.
Safety with Increased Efficiency
The aluminum heat engine in our CHG boilers is covered
by a 15-year limited factory warranty. The purchase of an
optional Burnham’s Winter Warmth Assurance program
for your CHG boiler can extend our True Blue Warranty
protection to include parts and labor for the entire boiler
for either 5 or 10 years.
15-Year Limited Warranty

The flame can be continuously
modulated from an orange
glow to a full blue flame.
The burner is located on the
top of the heat engine forcing
the heat down while the water
flows upward. This allows the
condensation to drain down
and away from the boiler.
CHG Site Glass & Burner
Abundant domestic hot water
is available with a matching
Alliance indirect-fired hot
water heater. Select from
several sizes to meet your
specific needs. In addition, the
CHG boiler control module
is preset for domestic hot
water priority and set point
temperature.
Domestic Hot Water
CHG boilers utilize a pre-mix combustion assem-
bly that includes a modulating gas valve, vari-
able speed blower and a venturi to provide an
optimal fuel/air mixture to a stainless steel mesh
burner. Together these components accurately
and efficiently help control the fully modulating
combustion process which automatically adjusts
the boiler’s firing rate to match your heating
needs.
Premix Technology
Negative regulated gas valve
with factory set outlet pressure.
Venturi
Variable
Speed
Blower
The CHG incorporates a sealed combustion
system that uses outside air for combustion and
the safe and proven AL29-4C stainless steel ma-
terial for venting the exhaust. Both horizontal
(“sidewall”) and vertical (“through-the-roof”)
venting options are available.
CHG Venting
Boiler
Model
Horizontal
Vent Max.
Vertical
Vent Max.
Vent
Diameter
CHG150 55 ft. 49.5 ft. 3 in.
CHG225 55 ft. 47 ft. 4 in.
The MCBA microprocessor control manages all
boiler functions including supervising the com-
bustion process and monitoring key operating
functions. Included is a digital display that can
provide detailed boiler information as well as be
an invaluable service and troubleshooting tool.
The MCBA module stores set points for boiler
and domestic hot water supply temperatures,
and monitors supply and return water tempera-
tures, flue gas temperature, the flame sensor,
and the included outdoor reset. The boiler con-
trol module allows for continuous modulation
(firing rates) by varying the combustion fan
speed.
Boiler Control Module & Outdoor Reset
Supply
Manifold
Return
Manifold
The CHG castings incorporate a multi-pass water
flow with the return water entering the lower
manifold and progressing upward to the sup-
ply manifold. This counterflow from bottom to
top provides for maximum heat transfer while
the serpentine pattern offers low pressure drop.
Each section’s water flow is independent with no
port connections between sections. The supply
and return manifolds are designed to balance
the flow across all sections.
Boiler Operations
Cutaway view showing
actual water flow path.

Boiler
Model
Vent
Diameter
(inches)
Air Inlet
Diameter
(inches)
Horizontal Venting Vertical Venting
Water
Volume
(gal.)
Approx.
Shipping
Weight
(lbs.)
Maximum
Vent
Length
(Equiv. Ft.)
Maximum
Air Inlet
Length
(Equiv. Ft.)
Maximum
Vent
Length
(Equiv. Ft.)
Maximum
Air Inlet
Length
(Equiv. Ft.)
CHG150 3 4 55 60 49.5 52 1.3 258
CHG225 4 4 55 60 47 52 1.1 323
Boiler
Model
Maximum Input
(MBH)
Minimum Input
(MBH)
DOE
Heating Capacity
(MBH)
I=B=R
Net Rating
(MBH) AFUE %
CHG150 150,000 30,000 135,000 117,000 93.10
CHG225 225,000 56,250 202,000 176,000 94.20
Back View
1-1/4 Return
Gas
Connection
Condensate Drain
Connection
Front View
F
Vent
Adapter
4" Air
Inlet Collar
LWCO
43-3/4
Top View
22-1/4
C
B
E
D
A
HG
Right View
Temperature/
Pressure
Gauge
Relief
Valve
1-1/4 Supply
Alternate
1-1/4 Return
Line Voltage
Connections
Low Voltage
Connections
Alternate
Condensate Drain
Connection
Alternate Gas
Connection
RATINGS
SPECIFICATIONS
DIMENSIONS
© 2006 U.S. Boiler Company, Inc. - Lancaster, PA
Phone: [phone]
www.burnham.comForm No. PL81401311000-6/06-10MS Printed in the U.S.A.
STANDARD EQUIPMENT
Deluxe Insulated Jacket
Circulator - Shipped Loose
Pressure Temperature Gauge
Drain Valve
MCBA Microprocessor Control
w/ Outdoor Reset (standard)
Digital Touchpad Display Panel
Variable Speed Combustion Blower
Negative Regulation Gas Valve
Venturi
Stainless Steel Mesh Burner
Supply Water Temperature Sensor
Return Water Temperature Sensor
Flue Gas Temperature Sensor
Flame Sensor
Differential Pressure Switch
High Limit
LWCO and Transformer
Condensate Trap
Air Inlet Screen
Safety Relief Valve
Boiler
Model ‘A’ ‘B’ ‘C’ ‘D’ ‘E’
CHG150 23-3/8 18-3/4 8-1/8 13 3-1/2
CHG225 27 22-3/8 8-1/4 7-1/8 3
* All dimensions in inches