andrews FASTflo WH42 Installation Manual, Operation And Maintenance Manual page 48

(4) Pull up the mixing tube block to the
upper section and remove it.
7. Removing the heat exchanger
• Remove the electric board, manifold,
mixing tube block and connectors in
advance.
(1) Remove the 3 locking screws at the
bottom of the burner case.
(2) Remove the 2 case top plate locking
screws.
(3) Remove the 3 locking screws at the flue
collar and adapter, pull out the heat
exchanger.
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