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GT INSTALLATION AND OPERATION INSTRUCTIONSPage 2
CONTENTS
Before You Start ................................................. page 2
Boiler Ratings & Capacities ...............................page 2
Boiler Location ...................................................page 3
Clearances to Combustible Construction ..........page 3
Combustion Air ..................................................page 4
General Venting Guidelines ...............................page 4
Horizontal Direct Vent Systems .........................page 5
Vertical Direct Vent Systems ...............................page 9
Condensate Drain ............................................page 10
General Plumbing Guidelines ..........................page 11
Primary Loop Plumbing ...................................page 13
Multiple Boiler Primary Loop Plumbing ...........page 13
Secondary Loop Plumbing ..............................page 13
Gas Supply Piping ...........................................page 18
Electrical Wiring ............................................... page 19
Sentry 2100 Controller ....................................page 26
Boiler Set Up ...................................................page 29
Operating Instructions .....................................page 29
Boiler Checking & Adjusting ............................page 33
Gas Pressure Adjustment ................................page 33
Boiler Maintenance ..........................................page 34
Wall Hung Conversion .....................................page 35
Trouble Shooting .............................................page 36
Replacement Parts ..........................................page 41
BEFORE YOU START
WARNING: This manual must be read and
fully understood before installing, operation
or servicing this boiler! Failure to follow these
instructions could result in a fi re or explosion
causing extensive property damage, personal
injury or death!
These instructions cover the GT Series gas fi red, direct
vent, low pressure, hot water boiler. GT boilers have been
design certifi ed by CSA for use with natural and propane
gas under the latest edition of ANSI-Z21.13/CSA 4.9,
Gas-Fired Low Pressure Steam and Hot Water Boilers.
Each unit has been constructed and hydrostatically
tested for a maximum working pressure of 30 psi,
207 kPa, in accordance with Section IV of the ASME
Boiler and Pressure Vessel Code. Each boiler has been
equipped with a 30 psi, 207 kPa pressure relief valve.
This manual covers the application, installation, operation
and maintenance of a GT Series low pressure hot water
boiler.
To obtain the safe, dependable, efficient operation
and long life for which this boiler was designed, these
instructions must be read, understood and followed.
Direct all questions to your Smith distributor or to the
Customer Service Department, 260 North Elm Street,
Westfi eld, MA 01085. Always include the model and serial
numbers from the rating plate of the boiler in question.
The owner should maintain a record of all service work
performed with the date and a description of the work
done. Include the name of the service organization for
future reference.
Where required by the authority having jurisdiction, the
installation must conform to the Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
The installation must conform to the requirements of the
authority having jurisdiction or, in the absence of such
requirements, to the National Fuel Gas Code, ANSI
Z223.1-latest revision. In Canada, the installation must
be in accordance with the requirements of CSA B149.1
or B149.2 Installation Code for Gas Burning Appliances
and Equipment.
If installed in the Commonwealth of Massachusetts, you
MUST FOLLOW the additional instructions contained in
Smith’s instruction sheet MA IOM. If you don’t have a
copy call your Smith distributor or Smith.
BOILER RATINGS & CAPACITIES
Before undertaking the installation of the GT check the
boiler rating plate to ensure that the boiler is the proper
size for the job.
Also ensure that the boiler has been set up for the type
of gas available at the installation site. Other important
considerations are the availability of an adequate
electrical supply, fresh air for combustion and proximity
a suitable outside wall.
High Altitude Operation
The GT boiler is designed to operate to capacity in
installations with 2000 ft, 610 m of elevation or less. At
elevations higher than 2000 ft, 610 m the unit will de-rate
due to the lower air density, see Figure 1.
NOTE: It is the Installers responsibility to check
the combustion, and to adjust the combustion in
accordance to Operating Instructions Section.