Assessments - 2, GPA: 3.5
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NPT PRV. NOTE: (A.S.M.E. version varies slightly. It is of bronze construction, and is supplied with the A.S.M.E. Section IV, pressure relief valve pre-installed at factory.) Test the relief valve at least once a year by lifting up lever. Figure 29. ENERGY SAVING TIPS 1. If possible, keep pool or spa covered when not in use. This will not only cut heating costs, but also keep dirt and debris from settling in the pool and conserve chemicals. 2. Reduce the pool thermostat setting to 78° F. or lower. This is accepted as being the most healthy temperature for swimming by the American Red Cross. 3. Use an accurate thermometer. 4. When the proper maximum thermostat settings have been determined, tighten the thermostat knob stopper. 5. Set time clock to start circulation system no earlier than daybreak. The swimming pool loses less heat at this time. 6. For pools that are only used on the weekends, it is not necessary to leave the thermostat set at 78° F. Lower the temperature to a range that can be achieved easily in one day. Generally, this would be 10° F. to 15° F., if pool heater is sized properly. 7. During the winter or while on vacation, turn the heater off. 8. Set up a regular program of preventative maintenance for the heater each new swimming season. Check heat exchanger, controls, burners, operation, etc. P/N • Réf. 472090 Rev. G • Rév. G 5-27-04 Section VI. Maintenance 31 SPRING AND FALL OPERATION If the pool is being used occasionally, do not turn the heater completely off. Set the thermostat down to 65° F. This will keep the pool and the surrounding ground warm enough to bring the pool up to a comfortable swimming temperature in a shorter period of time. WINTER OPERATION _ACAUTION_ • Operating this heater continuously at water temperatures below 68° F. will cause harmful condensation and will damage the heater and void the warranty. • If the heater has been drained for freezing condition, do NOT turn "ON" until the system is circulating water. • Water trapped in the heat exchanger can result in freeze damage to the exchanger or headers. Freeze damage is specifically not covered by the warranty. If the pool won't be used for a month or more, turn the heater off at the main gas valve. For areas where there is no danger of water freezing, water should circulate through the heater all year long, even though you are not heating your swimming pool. The MiniMax NT should not be operated outdoors at temperatures below 0° F. for propane and -20° F. for natural gas. Where freezing is possible, it is necessary to drain the water from the heater. This may be done by opening the drain valve, located at the inlet/outlet header, (see Figure 29.), allowing all water to drain out of the heater. It would be a good practice to use compressed air to blow the water out of the heat exchanger. (See additional notes under Important Notices in Introduction.) Rev. G • Rév. G 5-27-04 P/N • Réf. 472090 Section VI. Maintenance 32 CHEMICAL BALANCE POOL AND SPA WATER Your Pentair Pool Products pool heater was designed specifically for your spa or pool and will give you many years of trouble-free service, provided you keep your water chemistry in proper condition. Three major items that can cause problems with your pool heater are: improper pH, disinfectant residual, and total alkalinity. These items, if not kept properly balanced, can shorten the life of the heater and cause permanent damage. ACAUTION Heat exchanger damage resulting from chemical imbalance is not covered by the warranty. WHAT A DISINFECTANT DOES Two pool guests you do not want are algae and bacteria. To get rid of them and make pool water sanitary for swimming - as well as to improve the water's taste, odor and clarity - some sort of disinfectant must be used. Chlorine and bromine are universally approved by health authorities and are accepted disinfecting agents for bacteria control. WHAT IS A DISINFECTANT RESIDUAL? When you add chlorine or bromine to the pool water, a portion of the disinfectant will be consumed in the process of destroying bacteria, algae and other oxidizable materials. The disinfectant remaining is called chlorine residual or bromine residual. You can determine the disinfectant residual of your pool water with a reliable test kit, available from your local pool supply store. You must maintain a disinfectant residual level adequate enough to assure a continuous kill of bacteria or virus introduced into pool water by swimmers, through the air, from dust, rain or other sources. It is wise to test pool water regularly. Never allow chlorine residual to drop below 0.6 ppm (parts per million). The minimum level for effective chlorine or bromine residual is 1.4 ppm. pH - The term pH refers to the acid/alkaline balance of water expressed on a numerical scale from 0 to 14. A test kit for measuring pH balance of your pool water is available from your local pool supply store; see Table 14. Table 14._pH Chart_ St...