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Resumen del manual
Support all piping. Fig. 31Plumbing Connections (with shutoff valves) and Pressure Relief Valve Water filter 3.11 Domestic hot water recirculation Although recirculation directly through the tankless water heater is allowed, temperature stability is improved by recirculating through a mini-tank as shown in Fig. 32. By using the design in Fig. 32, there is no recirculation of hot water through the tankless water heater and therefore, does not affect the heat exchanger warranty. Direct recirculation through the tankless water heater is permissible, however, the heat exchanger warranty is reduced; contact Bosch Thermotechnology for further installation requirements. The following drawing is provided to outline one possible recirculation design using the water heater in conjunction with an Ariston mini tank water heater. This schematic is for illustration only and must not be used for actual installation without appropriate engineering and technical advice from a properly licensed professional in the locality where the installation is made. 6720608158-77.1AL14532Ariston Minitank GWH 2700 ES Fig. 32 Recirculation application 1 Full port isolation valve 2 Circulator (pump) 3 Check valve 4 PRV 5 Expansion tank The use of a small electric mini-tank water heater (4-6 gallon size) should be used for this application and designed so the pump will circulate the water through the mini-tank and the building's hot water return loop only. Timed or thermostatically controlled operation of the pump is commonly done. Contact Bosch Thermotechnology if further information is needed. 6 720 608 542 6 720 608 542 Installation instructions 27 3.12 Measuring gas pressure Confirm gas pressure upon installation. Connecting manometer B Shut off gas supply at installer supplied shutoff valve for this water heater. B Remove front cover and locate inlet gas pressure measuring point (see Fig. 34). B Loosen screw inside left test point fitting (do not remove) and connect manometer tube to test point. Remove screw completely if correct size tapping is available. Static Pressure Test B Turn gas supply back on. B Record static gas pressure reading in table 15. Operating Pressure Test B Press ON/OFF button to turn off the appliance. B Press and hold "Program" (P) button and press ON/ OFF button to turn appliance ON. Fig. 33 B As soon as '188' is displayed, release "Program" , button and the display should read P2. B Press or until P1 appears. Note: While in this mode the appliance will run constantly at maximum power and allow maximum water flow. For inlet gas pressure adjustment consider the following table: B Turn on high volume of hot water flow (at least 6 gpm) and heater will ignite. If heater display reverts to P2, open more hot water fixtures to allow sufficient flow. Press until P1 reappears on display. B Operate all other gas appliances on the same gas piping system at maximum output. B Record lowest operating gas pressure reading in table 15. Gas pressures lower than 3.5" W.C. for Natural Gas or 8" W.C. for LPG will result in insufficient degree rise to the hot water being used, reduced hot water volume, possible error code faults and must be corrected. See Gas Connections, chapter 3.8, page 22. Fig. 34 Gas pressure test port (left tapping) Gas type NG LPG 3.5” WC 8” WC Table 14 Minimum inlet gas pressure under full operation Static Gas Pressure Reading (see Chapter 3.12) enter here: ___________________ Date: ___________ Operating Gas Pressure Reading (see Chapter 3.12) enter here: ___________________ Date: ___________ Table 15 28 6 720 608 542 Electrical connections 4 Electrical connections 4.1 Electrical power supply The water heater requires an electrical power supply from a 120VAC / 60Hz properly rated receptacle and must be properly grounded. The heater is wired as shown in the wiring diagram (chapter 9, Fig. 59). Fig. 35 Connecting power supply cord 1 Power cord length: 3ft. Note: Outlet appliance is plugged in to should be clear from possible water damage. 4.2 Position of the fuses in control unit To check fuses, proceed as follows: B Remove the front cover, see Fig. 4, page 6. B Remove the three screws on front of the control unit. Fig. 36 B Pull control unit free to access and remove the six screws from the back cover of the control unit, see Fig. 37, pos. 2. B Check the fuses in the printed circuit board, see Fig. 37, pos. 3. Fig. 37 Location of fuses B After verifying the fuses mount all parts in reverse order. Warning: For safety reasons, disconnect the power supply cord to the heater before any service or testing is performed. Warning: This heater must be electrically grounded in accordance with the most recent edition of the National Electrical Code. NFPA 70. In Canada, all electrical wiring to the heater should be in accordance with local codes and the Canadian Electrical Code, CSA C22.1 Part 1. Do not rely on the gas or water piping to ground the metal parts of the heater. 2 1 3 6720608158-78.1AL 6 720 608 542 Operatio...
Otros modelos de este manual:Calentadores de Agua - GWH 2700 ES LP (4.78 mb)