Raypak 406A, 206A Tube Cleaning Procedure, Desooting Procedure, Brush, Combustion Chamber Removal

Extension Pieces (2) Auger with Carbide Tip Wire Brush Fig.# 8154.0

TUBE CLEANING PROCEDURE

Establish a regular inspection schedule, the frequency depending on the local water conditions and the sever- ity of service. Do not let the tubes clog up solidly. Clean out deposits over 1/16" in thickness.

The heater may be cleaned from the return header side, without breaking pipe connections. It is prefer- able, however, to remove both headers for better visi- bility through the tubes and to be sure the ground-up lime dust does not get into the system.

Note that you do not remove the top panel or the heater exchanger, generally.

After reaming, mount the wire brush in place of the auger and clean out debris remaining in the tubes.

Another method is to remove the heat exchanger, ream tubes and immerse heat exchanger in non-inhib- ited de-scale solvent for severe scale build-up.

DESOOTING PROCEDURE

WARNING: SOOT IS COMBUSTIBLE. EXERCISE EXTREME CARE.

Soot will clog areas between fins and cause eventual tube failure. Any sign of soot at the base of the burn- ers or around the outer jacket indicates a need for cleaning.

1.Remove top and flue collector from cabinet.

2.Remove "V" baffles from heat exchanger.

3.Remove burner tray. (See pg. 38).

4.Remove heat exchanger from the heater and wash with a garden hose, making sure soot is removed from spaces between fins.

5.Reverse above procedure to reinstall.

NOTE: In extreme cases it may be necessary to do steam cleaning at the local car wash. DO NOT WIRE

BRUSH.

COMBUSTION CHAMBER REMOVAL

To remove combustion chamber, you must first have removed the heat exchanger.

Atmospheric Heaters Low NOx Heaters

REFRACTORY PANELS - TOP VIEW

IMMERSION WELL REPLACEMENT

(Millivolt and ASME)

1.Shut off water to heater and drain heat exchanger.

2.Remove access panel on water connection side.

3.Remove old immersion well with bushing and sleeve.

4.Install replacement well in header.

NOTE: Installation in polymer header should be hand tight plus 1/2 turn.

Well Assembly

Fig. #2010

UNITHERM GOVERNOR (U.G.) REPLACEMENT

1.Shut water, gas and electricity off, close valves and relieve pressure.

2.Drain heat exchanger.

3.Remove retainer plug located next to the outlet pipe connection.

4.Unsnap old U.G. to remove from retainer plug. Snap in new U.G.

5.Reinstall retainer plug, taking care to lubricate gasket with a non-petroleum based grease such as AquaLube.

Retainer Plug

U.G.

Spring

Gasket

Fig. #2011

To test the operation of the Unitherm Governor, place in hot water (over 110°F) and watch for movement against spring. If there is no movement, replace unit.

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