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Installation & Operation Manual
Models: 400 - 801
This manual must only be used by
a qualifi ed heating installer / service
technician. Read all instructions,
including this manual and the Knight
XL Service Manual, before installing.
Perform steps in the order given.
Failure to comply could result in
severe personal injury, death, or
substantial property damage.
ƽ WARNING
Save this manual for future reference.
KBXII-I-O Rev D