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Resumen del manual
They are to be used as a reference by the installer or servicer in performing their work. A diagram of the boiler wiring is furnished with the boiler. WIRING DIAGRAM 208V OR 240V THREE-PHASE (DELTA) WITH STEP CONTROL 8 WIRING DIAGRAM 480V THREE-PHASE (WYE) SYSTEM CLEANING The hot water system should be internally cleaned and flushed to remove contaminants which may have accumulated during installation. System cleaning provides chemical stability necessary for component life and system performance. Failure to clean the system may cause: 1. Poor heating due to formation of gas. • Residual pipe dope, thread cutting oil, solder flux, dirt and other foreign materials breakdown to form gas. This is indicated by a continuing need for purging even through the system is “closed”. 2. Pump seal leakage. • Acidic water (low pH) and contamination such as soil and sand result in premature or recurring pump seal failures. 3. Automatic air valve leakage. • Contaminants cause sticky sealing surfaces and result in leakage. 4. Relief valve operation. • Gas formation increases system pressure and relief valve spillage. 5. Water leaks at joints and fittings. • Corrosion and eventual failure of connections occur when system pH is low. 6. Noisy operation. • Heat transfer surfaces can be fouled with dirty, oily water. This plus gas lead to noisy water circulation. WARNING Be sure to turn off power when working on or near the electrical system of the boiler. Never touch electrical components with wet hands or when standing in water. When replacing fuses always use the correct size for the circuit. OPERATION GENERAL Never operate the heating elements without being certain the boiler is filled with water and a pressure relief valve is installed in the relief valve opening provided. An electronic type low water cutoff is provided on all boilers as standard equipment. The water probe is installed near the top of the tank to monitor the presence of water. The control circuit is opened if the water level is below this point. The pilot switch on the cabinet front permits the boiler to be turned on and off without having to operate the electrical disconnect switch. Additional switches may be provided for manually operating contactor coils. WARNING Full power is present whenever the cabinet door is opened even with the pilot switch(es) turned off. Never operate the boiler with cabinet doors open or panels removed. FILLING Refer to SYSTEM CLEANING section for preparing the system prior to final filling and operation. Hard Water: in areas which have hard water it may be desirable to fill the system with soft water and/or provide water treatment as recommended by a consultant familiar with local conditions. In this way harmful water scale build-up on the heating elements is minimized. 1. Close the boiler drain valve and system valves as necessary. 2. Open a vent in the highest point of the system to allow the air to escape. 3. Fully open the make-up water inlet valve. Fill the boiler and piping. 9 4. Close the vent as water starts to flow from the opening. Place the Tank flushing and circulating pump lubrication should be performed make-up water valve in the desired position. The boiler is now in accordance with the above schedule. Tank sediment removal and ready for START UP and TEMPERATURE REGULATION if being element lime scale removal must be performed when needed as placed in operation for the first time. determined by period inspections. Following are the instructions for performing recommended maintenance. START UP The following checks should be made by the installer when the boiler is placed into operation for the first time: 1. Check all factory and field made water and electrical connections for tightness. • Repair water leaks and tighten electrical connections as necessary. 2. Turn on the electrical disconnect switch and pilot switch(es) mounted on the boiler cabinet. 3. Observe the operation of the boiler during the first heating cycle. • Temperature control and contactor operation should be checked by allowing the boiler to come up to temperature and shutoff automatically. TEMPERATURE REGULATION Always turn off the electricity at the electrical disconnect switch when making a temperature control adjustment. It is suggested the temperature adjustment be turned to the lowest setting which satisfies the hot water requirements of the system. • Additional instructional literature is provided with the boiler for adjusting this control. Always close and lock the cabinet door after making a temperature adjustment. Turn on electricity. DRAINING The boiler must be drained if it is to be shut down and exposed to freezing temperatures. Maintenance and service procedures may also require draining the boiler. 1. Turn off the electrical disconnect switch. 2. Close the make-up water valve and system valves as necessary. 3. Open a nearby outlet to vent the parts of the system being drained. 4. Open the boiler drain valve. 5. If the boiler is being ...
Otros modelos de este manual:Calentadores de Agua - NW 37-670 (244.06 kb)
Calentadores de Agua - NW 37-670 (244.06 kb)
Calentadores de Agua - NW 37-670 (244.06 kb)