TJERNLUND IN-LINE DRAFT INDUCER REFERENCE GUIDE 8500590 REV. B 0403, DJ-3, D-3, I, IL Reference Manual
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Improve Heating Efficiency
In-Line Draft Inducers assure positive draft
when restricted boilers and furnaces, poor
chimneys or negative pressures in buildings prevent proper exhaust of combustion gases. The Venturi action starts air
moving up the stack instantly and keeps it
moving smoothly. In-Line inducers are
built for long-lasting, trouble-free service
and available in sizes and capacities to
meet virtually all heating system requirements. The Vari-Draft control permits
adjustment to individual job requirements. Vents/Chimneys utilizing In-Line
Draft Inducers must be vertically terminated above the roof line.
www.tjernlund.com •
800.255.4208
Residential Commercial Industrial
Reference Guide
by
Tjernlund
In-Line
Draft
Inducers
Use On Vertically Terminated Vent Systems Only
Typical Applications:
• Boilers/Furnaces
• Water Heaters
• Modular Boiler Systems
• Multiple Appliances
• Bakery Ovens
• Factory Processes
Solves Venting Problems:
• Undersized Chimneys
• Negative Pressures
• Long Horizontal Vent Connectors
• Down Drafts
• Cold Equipment Starts
• Restrictive Heat Exchangers/Combustion
Chambers
Everything Needed to Conform
Easy Installation
www.tjernlund.com •
800.255.4208
A Size For Every Application
Models
DJ-3, D-3
Models
I, IL, XL
Model
HD
1. Cut Slot in Pipe
2. Insert Inducer
3. Install Bands*
■ Select a position between draft
hood, diverter or barometric
damper and chimney, locating
the Inducer as close to the
chimney as possible. Inducer
should be mounted 2-3 pipe
diameters away from a directional
change, i.e. elbows and tees, so turbulence is not created.
■ Mount the Draft Inducer on vertical, horizontal or inclined vent
pipe. If used on a horizontal vent pipe, mount Inducer on bottom
of pipe, not on top, to avoid creating a heat trap in the Inducer.
■The motor shaft must be level and horizontal to avoid excessive
wear on bearing.
Three Basic
Steps...
Typical In-Line
Inducer and safety
interlock using
UC1 Control and
PS1505 Fan Prover
Tjernlund offers
six In-Line Draft
Inducers to fit
vent pipe sizes
from 3" to 24".
UC1 Control
PS1505
Fan Prover
* Models DJ-3 & D-3 fasten with screws.
■ If change in vent pipe size is required, use a tapered
increaser or reducer.
■ In-Line Inducers should be installed on a section of single
wall vent pipe in order to assure proper performance.
■ Do not use In-Line Draft Inducers on condensing heating
equipment.
■ We recommend the use of a carbon monoxide detector
in all mechanical rooms.
Fan Prover Safety Interlock
Model PS1505
To satisfy national mechanical codes for oil and gas installations,
Draft Inducers must be properly interlocked with burner circuits.
The PS1505 Fan Proving Switch monitors pressure within the
Inducer housing to verify Inducer operation. Used in conjunction
with the UC1 Universal Control, it assures compliance with codes
and simplifies electrical interlock with all 24 /115 VAC burner
circuits. The PS1505 is not compatible with millivolt gas valves.
with National Mechanical Codes
Chimney
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