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4.1. General Requirements ............................................................................................. 40
4.2. Servicing Instructions ............................................................................................... 40
4.3. Replacing Parts ........................................................................................................ 41
4.3.1. Pilot Assembly Replacement ............................................................................. 41
4.3.2. Injector Replacement ......................................................................................... 41
4.3.3. Control Valve Replacement ............................................................................... 42
4.3.4. Motor Replacement (Remote Control / Optimum Control Models) .................... 42
4.4. Installation and Operational Troubleshooting ........................................................... 43