Pool & Spa Heaters

All ModelsDESOOTING PROCEDURECAUTION: SOOT IS COMBUSTIBLE. EXERCISEEXTREME CARE. NEVER USE A WIRE BRUSH.Soot can clog areas between fins and cause eventualtube failure. Any sign of soot at the base of theburners or around the outer jacket indicates a needfor cleaning.1. Disconnect top portion of unit. (See heatexchanger removal procedure steps 1through 6).2. Remove burner tray (See burner drawerremoval procedure.)3. Take a garden hose and wash heatexchanger,making sure soot is removedcompletely from between fins. Avoidexcessive water against refractory.NOTE: DO NOT WIRE BRUSH.055, 155, 185, 265 & 405 ModelsUNITHERM GOVERNOR (U.G.) REPLACEMENT1. Shut water, gas and electricity off, closevalves and relieve pressure.2. Drain heat exchanger.3. Remove retainer located under outletpipe connection.4. Remove spring and replace old U.G. with anew U.G.5. Reverse above procedure to reinstall.GasketRetainer PlugSpringTo test the operation of the Unitherm Governor, placein hot water (over 43°C) and watch for movementagainst spring. If there is no movement, replace unit.055, 105 & 155 ModelsCOMBUSTION CHAMBER REMOVAL1. Remove heat exchanger (See heatexchanger removal procedure).2. Lift up and remove front and rear refractoryshield.3. Remove refractory panels.4. Reverse above procedure to re-install.Ensure no gaps in cornersRefractory Panels Top View185, 265 & 405 ModelsCOMBUSTION CHAMBER REMOVALTo remove combustion chamber, you must first haveremoved the heat exchanger. Unbolt metal combustionchamber retainer from top and remove combustionchamber panels individually.UniTherm Governorugrep.tifRetainer PlugEnsure no gapsin cornersGasketref265.dwgRefractory Panels Top ViewExtension Pieces (2) Auger with Carbide Tip Wire Brushsoot.tif2927-01-04