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The LMGD-Series provides
"Sealed Combustion". This feature provides an important safety consideration.
Today's houses are super-insulated and tightly constructed, consequently sufficient
combustion air may not be available. The LMGD unit, with its unique stainless steel
combination air intake and exhaust assures efficient combustion through the sidewall.
Available only in Direct Vent.
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GREAT FOR.............
 | New Construction
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 | Electric Heat Conversion
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 | Homes with Poor or No Chimneys
 | Eliminates the Cost of a Chimney
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 | No Standing Pilot to Waste Gas
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 | Approved for Closet and Alcove Installation
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 | Combination Intake and Exhaust Assures Balanced Flue
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 | Eliminates Wasted Energy by Utilizing Outside Air
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 | Safe.... Combustion Gases are Sealed to the Outdoors
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 | Design Certified for Combustible Floors
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The low mass gas boiler from Thermo-Dynamics is a wet-base, horizontal
tube, two pass boiler design. Using proven industry designs for efficiency and durability,
coupled with an indirect domestic water system, this compact boiler offers installers
installers many ways to meet the comfort requirements of their customers.
WATER VOLUME - The low, 5 1/2 gallon water content provides heat and hot
water delivery within minutes of start up. The low mass concept eliminates standby losses
associated with boilers during the off cycles and provides almost instant heating with
less fuel consumption.
83% to 84-1/2% AFUE EFFICIENCY - No Vent Damper Required -
Non-Condensing. This high efficiency obtained with the LMG Boiler are due to the design of
the heat exchanger and the reduction of standby losses.
BURNER DESIGN - Quiet "Pre-mix" burner design performs with
3" WC pressure on either natural or LP Gas.
HOT SURFACE IGNITION
THREE MODELS OFFERED - 90,000, 105,000, and 120,000
NO DRAFT HOOD REQUIRED
SAFETY SYSTEM - Offers multi-check gas safety shutdown. This system
senses proper flue pressure and burner air flow before opening the main gas valve.
COMPACT SIZE - Standing 19-3/4 inches high, 19 inches wide, and 36 inches
long, this compact boiler not only saves space but can often be installed easily where
other boilers cannot.
ASME CONSTRUCTED AND IBR RATED - Each boiler is constructed and
hydrostatically tested in accordance with ASME Boiler Code. The capacity and efficiency
are rated in accordance with the standards of the Institute of Boiler and Radiator
Manufacturers.
LIFETIME LIMITED WARRANTY - Unlike other pro-rated warranties that often
only cover a small percentage of the replacement cost after the 15th or 20th year,
Thermo-Dynamics boiler replacement costs are never more than 50% of the replacement boiler
list price.
BUILT IN "AIR SCOOP" - purges air from the system providing a
quiet trouble free hot water heating system.
EASY CLEANING AND MAINTENANCE - Accessibility to combustion areas and the
open tubes make it easy for the service technician to thoroughly clean the boiler. The
LMG-Series can be cleaned and serviced from either end by simply removing eight bras nuts.
The burner end clean-out door is a hinged, swing-away door. A well-maintained
boiler continues to perform at high efficiency and is less likely to develop service
problems.


Standard Equipment
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ASME Code Boiler with Swing-Away
Door
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Flush Jacket - Powder Coated
Finish
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Altitude, Temperature and
Pressure Gauge
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Pre-Mix Gas Burner (Natural or
LP)
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Hot Surface Ignition
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Safety Pressure Switches
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High Limit Control
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Circulator/Burner Relay
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007 Circulator or Equivalent
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ASME Relief Valve
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Brass Boiler Drain
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Built-in "Air Scoop"
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Stainless Steel Combination Vent
Hood
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Stainless Steel 5X4 Vent Adapter
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Optional Equipment
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Boiler Stand
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Duct Coil- 60,000
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Duct Coil- 150,000
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Plate Typed Domestic Coil
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LP Conversion Kit
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Thermostatic Bypass Valve
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Ratings and Capacities
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MODELS
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AGA INPUT BTU/HR
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HTG CAPACITY BTU/HR
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I=B=R NET OUTPUT BTU/HR
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AFUE RATINGS
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SHIPPING WEIGHT
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LMGD - 90
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90,000
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76,000
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66,300
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84.5
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300
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LMGD - 105
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105,000
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88,000
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76,600
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83.7
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300
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LMGD - 120
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120,000
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100,000
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86,700
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83.0
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300
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MODEL
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CLEARANCE FROM COMBUSTIBLES
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GAS INLET PIPING
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MANIFOLD PRES NATURAL OR LP
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SIDES/FRONT
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JKT FRONT
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VENT CONN
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LMGD - 90
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4"
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6"
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6"
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1/2" Dia.
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3" W.C.
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LMGD - 105
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4"
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6"
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6"
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1/2" Dia.
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3" W.C.
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LMGD - 120
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4"
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6"
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6"
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1/2" Dia.
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3" W.C.
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NOTE: Specify (1) Model Number (2) Type of
Gas - Natural or LP
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Handcrafted by ASME Welders in
Pennsylvania, America's "Industrial Heartland"

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