Service Manual
Models: 400, 500, 600, 725, & 850
This manual must only be used
by a qualified heating installer
/ service technician. Read all
instructions, including this
manual and the FTXL Installation
and Operation Manual, before
installing. Perform steps in the
order given. Failure to comply
could result in severe personal
injury, death, or substantial
property damage.
WARNING
Save this manual for future reference.
FTXL-SER Rev A
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