Bosch C 1050 Manual
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6 720 644 894 Installation instructions31 3.11 Filling the condensate trap The condensate trap can be filled before or after connecting the vent pipe. Filling the condensate trap before vent pipe installation BFill the condensate trap by pouring approx.14 oz. (400ml) of water into the exhaust accessory on the top of the appliance, see Fig. 35. Fig. 35 Filling the condensate trap at start up Filling the condensate trap after vent pipe installation After appliance has been out of use for a long time or after cleaning siphon, refill the condensate trap w ith water. Please proceed as follows: B Remove front cover, see Fig. 4, page 7. B Open the four clips and remove the combustion cover, see Fig. 5, page 7. B Remove the clip and disconnect the drain tube, see Fig. 36. Fig. 36 Disconnect drain tube B Fill the condensate trap by pouring approx.14 oz. (400ml) of water into the top of the drain tube. To avoid damage to the appliance use a funnel in this operation, see Fig. 37, page 31. Fig. 37 Filling the condensate trap after installati on B Loosen the three screws of the control unit. Fig. 38 B Put the control unit in service position by engagin g its tabs with the holes in the bottom horizontal sheet metal, see Fig. 39. B Check water level in the condensate trap. Fig. 39 Water level in condensate trap B After filling reassemble all parts in reverse order . Danger: Prior to initial start up, and after appliance has been out of use for a long time or after cleaning the sifon, make sure that you fill the condensate trap with water. This is to prevent dangerous exhaust gases from entering the building.
6 720 644 89432 Installation instructions 3.12 Domestic hot water recirculation Although recirculation directly through the tankles s water heater is allowed, temperature stability is improved by recirculating through a mini-tank as sh own in Fig. 40. By using the design in Fig. 40, there i s no recirculation of hot water through the tankless wat er heater and therefore, does not affect the heat exchanger warranty. Direct recirculation through t he tankless water heater is permissible, however, the heat exchanger warranty is reduced; contact Bosch Thermotechnology for further installation requireme nts. The following drawing is provided to outline one possible recirculation design using the water heate r 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 enginee ring and technical advice from a properly licensed professional in the locality where the installation is made. Fig. 40 Recirculation application 1 Full port isolation valve 2 Circulator pump on timer 3 Check valve 4 PRV 5 Expansion tank The use of a small electric mini-tank after heater (4-6 gallon size) should be used for this application an d designed so the pump will circulate the water throu gh the mini-tank and the buildings hot water return l oop only. Timed or thermostatically controlled operatio n of the pump is commonly done. Contact Bosch Thermotechnology if further information is needed. 6720608158-77.1AL 1 4 5 3 2 Ariston Minitank C 1050 ES
6 720 644 894 Installation instructions33 3.13 Space heating applications Bosch tankless water heaters are approved for use i n combination DHW and space heating applications (open-loop setup). These water heaters are not approved for use in space heating only applications (closed-loop setup). Bosch supports applications of combination DHW and space heating in an open loop configuration if plumbed similar to Fig. 42. Use of a Bosch tankless water heater in a combination DHW and space heating application will result in the pr oduct warranty being reduced to 3 years. Fig. 41 Pressure drop curve Warning: If the set point temperature is above 120°F, precautions should be taken to protect users of potable water from scalding. Warning: Propylene glycol may be used for freeze prevention ONLY on the space heating side of the heat exchang- er. Do not use ethylene glycol (automo- tive antifreeze). Warning: The use of a flow switch is recommended to ensure DHW priority and to prevent “cold-blow” situations when the Bosch tankless water heater is used with an air-handling system. The flow switch should be used to disable the blower on the air-handling system when domestic water is used. Warning: Ensure the primary pump is properly sized to provide adequate flow for the system heat load. i For Pump sizing please refer to the pressure drop curves, Fig. 41. Also remember to account for system piping pressure loss. A minimum of 1.7 GPM is recommended to provide adequate flow through the water heater when determining the size of the primary pump. Flow(GPM) Pressure(FeetofHead) 0 0.0 1.0 2.0 3.0 4.0 5.0 10 20 30 40 50 60 70 C1050ES 6720644894-01.1V
6 720 644 89434 Installation instructions Fig. 42 Space heating diagram 1 Hot water outlet 2 Cold water inlet 3 Pressure relief valve 4 Gas supply 5 Shut off gas valve 6 Thermal expansion tank (as required) 7 Atmospheric vacuum breaker 8 Cold inlet 9 Check valve 10 Pump 11 Thermostatic mixing valve 12 Thermometer (optional) 13 DHW outlet 14 Water to water heat exchanger 15 Backflow preventer 16 Automatic water feed 17 Thermostat 18 Space heating zone 19 Zone controller 20 Space heating pump 21 Expansion tank 22 Pressure relief valve 6720644887-02.1V 21 3 5 6 7 8 13 11 12 5 21 17 20 14 10 9 9 9 1516 22 19 4 T 18 5
6 720 644 894 Installation instructions35 3.14 Measuring gas pressure Confirm gas pressure upon installation. Connecting manometer BShut off gas supply at installer supplied shutoff v alve for this water heater. B Remove front cover and locate inlet gas pressure te st port (see Fig. 44). B Loosen screw inside left test point fitting (do not remove) and connect manometer tube to test point. Static Pressure Test B Turn gas supply back on. B Record static gas pressure reading in table 22. Operating Pressure Test B Press ON/OFF button to turn off the appliance. B Press and hold Program button and press ON/OFF button to turn appliance ON. Fig. 43 B As soon as 188 is displayed, release Program button , and the display reads 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 foll ow- ing table: B Operate all other gas appliances (except heater) on same gas piping system at maximum output. B Turn on high volume of hot water flow (at least 6 gpm) and burner will light. If heater display rever ts to P2, open more hot water fixtures to allow sufficien t flow. Press until P1 reappears on the display. B Record lowest operating gas pressure reading in table 22. 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. S ee Gas Connections, chapter 3.8, page 26. P1 fan speed: Factory default: NG: 51, LP: 51 Lowering P1 fan speed reduces the maximum BTU input. As a temporary measure if the gas pressure in P1 is below specification, lower P1 fan speed incremental ly until minimum inlet gas pressure reaches specified range (table 21). After upgrading gas line, reset appliance to P1 factory default setting (NG: 51, LP : 51) or setting from Section 3.3.7. Fig. 44 Gas pressure test port (left tapping) Gas typeNGLPG p in 3.5” WC 8” WC Table 21 Minimum inlet gas pressure under full operation Static Gas Pressure Reading (see Chapter 3.14) enter here: ___________________ Date: ___________ Operating Gas Pressure Reading (see Chapter 3.14) enter here: ___________________ Date: ___________ Table 22
6 720 644 89436 Electrical connections 4 Electrical connections 4.1 Electrical power supply The water heater requires an electrical power suppl y 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. 72). Fig. 45 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: BRemove the front cover, see Fig. 4, page 7. B Remove the three screws from the control unit. Fig. 46 B Remove the six screws from the back cover of the control unit, see Fig. 47, pos. 2. B Check the fuses in the printed circuit board, see F ig. 47, pos. 3. Fig. 47 Fuses position B After checking the fuses, reinstall all parts in re verse 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 must 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. 6720608643-15.1AL 1 2 1 3 6720608158-78.1AL
6 720 644 894 Operation instructions37 5 Operation instructions Fig. 48 1On/Off button 2 Reset button 3 Program Key 4 LCD display 5 Up button 6 Down button 7 Power On or stand-by LED 5.1 Description LCD Display Fig. 49 Power bar indicator (input) Fig. 50 Temperature indicator Fig. 51 Error indicator Fig. 52 Locked condition indicator (only with remote control) Fig. 53 Flame indicator Fig. 54 Solar mode indicator (see chapter 5.4, page 38) Fig. 55 Remote control indicator Warning: Do not use any cleaning agressive or corrosive agents to clean the window.
6 720 644 89438 Operation instructions 5.2 For your safety read before operating your water heater A. This appliance is equipped with electronic ignitio n for lighting the main burner. When turning the heater o n, follow these instructions exactly. WHAT TO DO IF YOU SMELL GAS B Do not try to light any appliance. B Do not touch any electric switch; do not use any phone in your building. B Immediately call your gas supplier from a neighbors phone. Follow the gas supplier’s instructions. B If you cannot reach your gas supplier, call the fir e department. B. Use only your hand to press the on/off control swi tch. Never use tools. Follow these instructions exactly. If control switch is jammed, close the gas supply and call a qualified service technician. Attempted forceful repair may result in a fire or explosion. C. Do not use this appliance if any part has been und er water. Immediately call a qualified service technic ian to inspect the appliance and to replace any part of th e control system and any gas control which has been under water. 5.3 Power On B To start the appliance press the On/Off button. Fig. 56 Off B To shut down the appliance press the On/Off button again. 5.4 Temperature selection To select hot water temperature: BPress buttons or in order to reach desired temperature. Fig. 57 Setting the water temperature The desired temperature of the hot water can be adjusted on the front control panel of the heater. The water heater has an electronically controlled g as valve that modulates the burner input in response t o both varying hot water flow rates and/or changes in any incoming and outgoing water temperatures. Note: The water heater, running at minimum BTU, may still achieve temperatures above the desired set temperature. Low flowing fixtures are the leading c ause of this type of temperature overshoot. To combat th is symptom, clean fixtures or replace with higher flow ing ones if necessary. Saving water resources: B Make sure you close all the taps after any use. Avo id leaving the taps dripping. Repair any leaking tap. B Define the temperature you want, in the appliance o r with the remote control. This way you have the precise water flow needed (mixing cold water to regulate temperature will increase the water flow w ith consequent waste of water) Warning: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
6 720 644 894 Operation instructions39 Solar mode The water heater will not ignite if inlet water tem perature exceeds the set temperature on the appliance. In th is condition, the solar mode indicator will show on th e LCD display. See Fig. 54, page 37. Fig. 58 5.5 Use of optional remote control accessory (part no. TSTAT2) Fig. 59 Remote control The wireless remote control accessory (Fig. 84, component 13) and the temperature selector buttons on the front of the water heater operate identicall y. Contact your distributor to order the remote contro l accessory. Modification of the water heaters interi orcontrol unit (Fig. 84, component 16) is required whe n installing the remote control with this heater. 5.6 Operation B When a hot water tap is opened, main burner ignites and LCD displays indication . Fig. 60 B LCD flashes until selected temperature is reached. B Power bar indicates power percentage in use. 5.7 Reset button If the LCD shows the error symbol do not shut off power or unplug the heater. Follow instructions bel ow to reset error first. Record the error code on LCD and consult “Problem solving” section 8.1, page 49. Fig. 61 After following instructions indicated in “Troubleshooting” section, B press reset button firmly in order to return heater to normal operation. Fig. 62 Reset button If the problem persists, contact your installer. Warning: In applications where inlet water temperature can exceed 140°F (60ºC), a thermostatic or mixing valve must be installed before the appliance to prevent water exceeding 140°F (60°C) from entering the appliance. HOT BURN D A N G E R Watertemperatureover125°Fcan causesevereburnsinstantlyordeathfromscalds. Children,disabledandelderlyare athighestriskofbeingscalded. Seeinstructionmanualbefore settingtemperatureatwater heater. Feelwaterbeforebathingor showering. 6720608643-16.1AL i NOTE: up to 6 remote controls can be programmed for one single water heater, each with a range distance of 98 ft (30 m).
6 720 644 89440 Operation instructions 5.8 Program button Fig. 63 “Program” key 5.8.1 Memorizing selected temperature B Press buttons or to select desired temperature. B Hold “Program” button for 3 seconds to save temperature. When LCD stops blinking, temperature is saved in memory. Using “Program” function In order to select memorized temperature B Press “Program” key. LCD shows pre-memorized temperature, which is now the hot water selected temperature. 5.9 Locked condition This condition is only valid for appliances with on e or more remote controls installed. Fig. 64 Locked condition Whenever LCD shows the temperature setting cannot be adjusted because the appliance is in use by a user which already selected a different temperatu re. Appliance will be automatically unlock 5 minutes af ter closing hot water tap.