Installation – Installation Warnings and Notes 2-13
FlexFit – Linkageless Control – Revision 1.0
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Installation Warnings and Notes
WARNING
The FlexFit is a Primary Safety Controller. A qualied person must edit the FlexFit param-
eters to suit the design of the burner being controlled. Qualications include knowledge
of the burner design and operation; combustion experience; and the ability to apply all
applicable ame safeguard, boiler safety interlocks, and related national codes.
WARNING
The FlexFit controls potentially dangerous combustion processes. Verify that the red
equipment being controlled has been safely secured, isolated, or bypassed (as required
by site conditions) before making any wiring changes to the boiler, burner, or FlexFit con-
troller. Failure to do so can result in equipment damage, injury or death.
WARNING
It is very common to have multiple sources of power connected to the FlexFit and
control panel. Verify that all sources of power have been disconnected before
working on wiring. Failure to do so can result in injury or death.
Note
Before removing any wires from existing installations, ensure wires are properly marked with a number,
letter, or other convenient marking such that the installer can determine where each wire originally went.
Note
All panel and eld wiring shall conform to national and local electrical codes.
120 Volts AC Ground
Connect the incoming AC power ground (i.e. green wire ground) to the stud marked
GROUND on the FlexFit combustion control and G on the FlexFit ame safeguard.
Terminal Blocks
All eld wiring terminals are plug-in type and can be separated from the FlexFit boards.
This allows for easier installation and rapid FlexFit replacement without disconnecting indi-
vidual eld wires. Verify that terminals are inserted properly before applying power.
Wire Type
All terminals will accept 12–24 gage wire and should be tightened to 4.5 in-lb torque.
Each terminal will accept (2) 14 gage stranded wires. All wiring (AC, DC, and shielded
cable) should be copper, stranded, 150 V min., and rated 60 °C minimum.
Shielded Cable
All 4-20mA / 0-5 VDC input and output wiring should be 22 gage minimum,
100% foil shield and have twisted pairs (Belden 8737 or equivalent).
Flex Sequence Option
The ex sequence is an optional set of parameters that gives the commissioning engineer more exibility and options related
to burner ignition and gas valve leak testing. When the "Flex Sequences Option" is enabled, the various pilot ame and main ame
timings and whether direct spark ignition is used are set by the subsequent parameters. If the "Flex Sequences Option" is disabled,
the default timing sequence will be used. For more information, see "Flame Safety > Flex Sequences" on page 4-62. The "Flex
Sequences Option" must also be enabled if gas valve leak testing is to be used.
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