Raypak HD101, HD401 operating instructions Heat Exchanger Removal

3. Remove the (4) screws holding the panel in place.

Fig. 34: Remove the Screws and Panel

4.Pull the air filter out for inspection. Replace if nec- essary.

Heat Exchanger Removal

Refer to Fig. 36 for the following procedure.

1.Before beginning, make sure the heater is cool to the touch. Shut water, gas and electricity off, close valves and relieve pressure, then remove the relief valve. Remove side inspection panels.

2.Remove screw behind inspection panels holding the jacket top down.

3.Remove the front panel. Remove two additional screws holding the jacket top to the top support.

4.Disconnect vent pipe from the flue exhaust and set aside.

5.Remove jacket top, then disconnect vent switch hose.

6.Remove two rows of screws holding the flue col- lector to the combustion chamber. Remove two additional screws located on the front combustion panel. Cut any silicone holding the flue collector and heat exchanger in place.

7.Carefully lift and remove the flue collector.

8.Lift heat exchanger straight up being careful not to damage the refractory.

9.Reverse the above procedure to re-install. Make sure sufficient high temperature silicone sealant (RTV) is placed along the vertical sides of the tube sheet and flue collector.

Fig. 35: Inspect the Air Filter

5.When replacing, note the direction of the air flow defined on the side of the filter. The arrow should be pointing downward.

6.Replace the panel and screws before operating.

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