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11) Check all wiring connections at the main power, contactor, and control voltage terminal blocks (Figure 14-1), as well as on the generator itself. Energize the circuit breaker or main disconnect. Refer to Start-up Section if you encounter any problems when restarting the unit. 30 STEAM GENERATOR CHEMICAL CLEANING PROCEDURE This procedure is intended as a guide only for the chemical cleaning of the generator in all EHU models. Read and follow label directions on any cleaning product. Check local codes before disposing of chemicals. Caution: Muriatic acid can cause severe chemical burns if not handled properly. Wear rubber gloves and eye protection when using. Read and follow carefully the safety procedures on the package. 1) Obtain several gallons of muriatic acid. Muriatic acid is the name for commercial hydrochloric acid. It is available in most hardware, pool chemical, or farm supply outlets. 2) Remove the tank, following the "Tank Removal" directions in this manual. 3) Let the steam generator tank cool after removal from the EHU unit. 4) Split the tank, referring to the directions on page 33 of this manual, and examine the inside of the tank and the electrodes. a. If the tank is black or dark brown, the electrodes may have disintegrated and chemical cleaning may not be effective. The tank can be cleaned with the following process, but the electrodes may need to be replaced. b. If tank and electrodes have a white/tan/grey mineral accumulations and/or the tank is partially filled with loose lime accumulations, proceed with chemical cleaning. 5) Empty any loose deposits from the bottom tank half. Both tank halves and the barrier assembly, if present, can be cleaned using a scraper, a stiff bristle brush, and water spray as required. Refer to the directions on page 33 of this manual for details on removing the drain screen for further cleaning, if necessary. 6) Remove the electrodes from the upper tank half, following the directions on page 33 of this manual. Loose and/or soft deposits should be scraped from the exterior of the electrodes before chemical cleaning. 7) Prepare the chemical cleaning solution as per manufacturer's recommendations and fill a plastic bucket to a sufficient level to soak the electrodes. Be certain not to submerge the electrodes beyond the level of the screen. 8) Let the cleaning action take place for 15 minutes. Remove the electrodes from the bucket and rinse them thoroughly with a clean water spray. 9) Observe the electrodes to determine if another treatment is necessary. 10) It is not necessary for the electrodes to be cleaned down to bare metal. Removal of major accumulations is the only requirement. 11) Helpful Hints: * Check the drain valve for proper operation & good flow when the tank is drained prior to removal. * With the tank removed, inspect the drain adaptor and hose from adaptor to drain valve to ensure that it is free from deposits which may interfere with proper drainage. 31 12) Reassemble tank. Make sure o-rings are still on electrode terminals. Also check condition of steam generator o-ring. After a couple cleanings, it will need to be replaced. Make sure o-ring is sealed in its groove and not pinched when halves are put together. Do not over-tighten nuts that hold electrodes in place. This is an o-ring seal so nuts should be "snug". 13) Re-install the steam generator tank. Check out for proper operation. 32 TANK DISASSEMBLY, CLEANING, AND ELECTRODE REPLACEMENT MODELS EHU-703 AND 704, SINGLE AND THREE PHASE 1) Using a 7/16" wrench, disconnect the jumper wires from the steam generator. 2) Remove 24 metal clips by pushing gently on top of each clip with a screwdriver while cupping the clip with the other hand. 3) Lift the top half of the tank free of the bottom half and rest it on the electrodes. Use a ." wrench to loosen and remove the nuts from the six electrode studs. 4) Lift the top tank half from the electrodes. Remove the o-ring from the lower tank half o-ring channel and put it aside for re-use. On high voltage units, lift the barrier assembly out of the bottom tank half. 5) Clean the tank halves and the barrier assembly (Figure 35-1), if applicable, using a scraper, stiff bristle brush, and/or water spray. Rinse the unit with clear water. If necessary, the drain screen may be removed for cleaning by removing three screws and pushing up through the bottom tank connection with a screwdriver handle or other blunt object. The drain screen snaps back into place and is SECURED BY THE 3 SCREWS after cleaning. BOTH THE BARRIER ASSEMBLY AND THE DRAIN SCREEN SHOULD BE REPLACED WITH NEW PARTS IF THEY ARE UNSERVICEABLE. 6) Install one electrode in the top tank half. Make sure the small o-ring is located at the bottom of the electrode stud. Push the electrode through one of the holes in the upper tank half. Slowly turn the electrode until it locks in place. Thread a nut, finger tight, onto the electrode stud. Repeat this process with the other five electrodes. 7) Turn ...

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