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Resumen del manual
To prevent damage, care must be taken not to apply too much torque when attaching gas supply pipe to gas valve gas inlet. Fittings and unions in the gas line must be metal to metal type. Apply joint compounds (pipe dope) sparingly and only to the male threads of pipe joints. Do not apply compound to the first two threads. Use compounds resistant to the action of liquefied petroleum gases. BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR GAS LEAKAGE. Use soap and water solution or other material acceptable for the purpose in locating gas leaks. DO NOT USE MATCHES, CANDLES, FLAME OR OTHER SOURCES OF IGNITION FOR THIS PURPOSE. DISCONNECT THE HEATER AND ITS MANUAL GAS SHUTOFF VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY PRESSURE TESTING OF THAT SYSTEM AT TEST PRESSURES IN EXCESS OF 1/2 PSIG. THE GAS SUPPLY LINE MUST BE CAPPED WHEN NOT CONNECTED TO HEATER. THE HEATER MUST BE ISOLATED FROM THE GAS SUPPLY PIPING SYSTEM BY CLOSING ITS MANUAL GAS SHUTOFF VALVE DURING ANY PRESSURE TESTING OF THE GAS SUPPLY PIPING SYSTEM AT TEST PRESSURES EQUAL TO OR LESS THAN 1/2 PSIG (3.44kPa). CORRECT GAS MAKE SURE the gas on which the heater will operate is the same as that specified on the heater model and rating plate. Do not install the heater if equipped for a different type gas - contact the heater supplier. SIZING GAS SUPPLY LINE The iron pipe or equivalent pipe sizes in Table 6 are derived from Table C-3 in the NATIONAL FUEL GAS CODE. The pipe sizes are based on a supply line gas pressure drop of 0.3 inches of water column from the gas meter to the point of installation of the heater(s). For natural gas, a heating value of 1050 Btu/ft3 and a specific gravity of 0.60 has been assumed. A heating value of 2500 Btu/ft3 and a specific gravity of 1.53 has been assumed for L.P. (propane) gas. Where it is necessary to use an excess number of pipe fittings, i.e., elbows, tees and valves, in the gas supply line, use pipe at least one size larger than that recommended in Table 2 to compensate for the increased pressure drop. If the service pressure is 4.5 inches W.C. (1.12kPa) (11 inches (1.74kPa) for L.P. gas) of water column or less, use pipe size larger than specified in Table 6 to minimize pressure drop in the line. GAS METER SIZE - City Gases Only Be sure that the gas meter has sufficient capacity to supply the full rated gas input of the heater as well as the requirements of all other gas fired equipment supplied by the meter. If gas meter is too small, ask the gas company to install a larger meter having adequate capacity. TABLE 6 GAS SUPPLY PIPE SIZES (IN INCHES) Distance To Heater From Meter (FT./M) NATURAL GAS (1050 Btu/ft3) PROPANE GAS (2500 Btu/ft3) HW-120M HW-160M HW-200M HW-225M HW-120M HW-160M HW-200M 10 (3M) 1/2 3/4 3/4 3/4 1/2 1/2 1/2 30 (9.1M) 3/4 3/4 1 1 1/2 3/4 3/4 50 (15.2M) 3/4 1 1 1 3/4 3/4 1 80 (24.4M) 1 1 1 1/4 1 1/4 3/4 1 1 100 (30.5M) 1 1 1/4 1 1/4 1 1/4 3/4 1 1 150 (45.7M) 1 1 1/4 1 1/4 1 1/4 1 1 1 1/4 200 (61M) 1 1/4 1 1/4 1 1/4 1 1/2 1 1 1/4 1 1/4 14 A minimum gas supply pressure of 4.5" W.C. (1.12kPa) for natural gas and 11" W.C. (1.74kPa) for propane gas is required for purposes of input adjustment. ELECTRICAL INFORMATION ALL ELECTRICAL WORK MUST BE INSTALLED IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE IN THE UNITED STATES AND IN CANADA MUST CONFORM TO LOCAL REGULATIONS OR THE CANADIAN ELECTRICAL CODE CSA C22. The electrical connections must be made so that both the circulator and intermittent ignition device operate simultaneously when the storage tank temperature control calls for heat. The appliance, when installed, must be electrically grounded in accordance with local codes or, in the absence of local codes, in the United States with the NATIONAL ELECTRICAL CODE, ANSI/ NFPA 70. In Canada with the CANADIAN ELECTRIC CODE, CSA C22. A screw is provided in the heater junction box for a ground connection. All piping diagrams include an electrical wiring diagram to assist the installer in properly wiring of the additional components required to assure correct system operation. Figures 11 and 12 show the heater mounted controls as they are wired when the heater leaves the factory. Using the individual wiring diagrams on the installation diagrams, the installer connects his wiring to terminals in the heater(s) mounted junction box as shown. All wiring should be done such that the heater(s) will operate in the following manner: 1. When the tank temperature control calls for heat: • The circulating pump starts to operate. Once the safety flow switch contacts close, intermittent ignition device is powered and sequence through steps as described for I.I.D. Control Module on Page 5. 2. When the tank temperature control is satisfied: • The main burners should stop firing, but the circulating pump should continue to operate for about 2 minutes when equipped with a thermal balancer. 3. When the automatic gas shutoff control or coil protector switch operate (break electric circuit): • The main burners sho...
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