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SECTION 14: REPLACEMENT PARTS
35
14.4 Heat Exchanger
The heat exchanger consists of a four-pass design with 1.75" outer diameter [409 stainless steel] tube. The
tube plates are made of [aluminized steel] [409 stainless steel]. The tube supports are made of
[galvannealed steel] [409 stainless steel].
14.5 Flue Blower
IT IS IMPORTANT THAT ONLY THE CORRECT FLUE BLOWER SPECIFIED FOR EACH MODEL TYPE
IS USED WHEN REPLACING THESE ITEMS.
Carry out a start-up after working on or changing a flue blower. See Page 24, Section 11.
MODEL
UHD[X][S][R]
150 - 175
UHD[X][S][R]
200 - 300
UHD[X][S][R]
350 - 400
Flue Blower P/N 90710405 90710403 90710402
Remove screws securing
outlet flange to the flue
adapter.
Refit in reverse order.
Remove screws securing flue
blower mounting plate to vent
box.
Remove screws securing
mounting plate to blower.
Refit in reverse.
Use new gaskets.
Ensure sealed joints.
Ensure mounting plate orifice
is clear and not obstructed.