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Water heaters for use with Natural and L.P.G.
GWH-635-ES
Temperature Modulated with Electronic Ignition
Suitable for heating potable water only - Not approved for space heating purposes
(Intended for variable flow applications with multiple tapping points)
GWH-635-ES-N
GWH-635-ES-L
Warning: If the information in this manual is not
followed exactly. A fire or explosion may result
causing property damage, personal injury or death.
Do not store or use gasoline or other flammable
vapor and liquids in the vicinity of this or any other
appliance.
Improper
installation,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas
supplier.
In the Commonwealth of Massachusetts this
product must be installed by a licensed plumber or
gas fitter.
Upon completion of the installation, these
instructions should be handed to the user of the
appliance for future reference.
adjustment,
alteration,
What to do if you smell gas
• Close gas valve. Open windows.
• Do not try to light any appliance
• Do not touch any electrical switch; do not use any
phone in your building
• If you cannot reach your gas supplier, call the fire
department.
• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
PRO TANKLESS
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Table of Contents
Related Manuals for Bosch GWH-635-ES-N
Summary of Contents for Bosch GWH-635-ES-N
- Page 1 Suitable for heating potable water only - Not approved for space heating purposes (Intended for variable flow applications with multiple tapping points) PRO TANKLESS GWH-635-ES-N GWH-635-ES-L Warning: If the information in this manual is not What to do if you smell gas followed exactly.
- Page 2 Index Index Warning Warning Warning: If the information in this Appliance details manual is not followed exactly. A fire or Features explosion may result causing property GWH-635-ES Specifications (Technical data) damage, personal injury or death. Dimensions and Minimum installation clearances General rules to follow for safe operation Proper location for installing your heater Warning:...
- Page 3 Warning Warning: Field wiring connections and electrical grounding must comply with local codes, or in the absence of local codes, with the latest edition of the National Electric Code, ANSI/NFPA 70, or in Canada, all electrical wiring must comply with the local codes and the Canadian Electrical Code, CSA C22.1 Part 1.
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Page 4: Appliance Details
• Failure codes for easy diagnostic and repair. Accessories • Optional wireless remote control accessory to operate with the appliance • Vent termination kit. BOSCH is constantly improving its products, therefore specifications are Fig. 3 Gas pressure measuring point subject to change without prior notice. - Page 5 Appliance details • Minimum recommended water pressure range: 30 UNPACKING THE GWH-635-ES HEATER PSI (2.07 bar) This heater is packed securely. • Connections: The box includes: – Bottom of heater • Pressure relief valve Combustion • Bracket for wall hanging the heater •...
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Page 6: Dimensions And Minimum Installation Clearances
Appliance details Dimensions and Minimum installation clearances Fig. 5 Dimensions Cover On/Off switch Reset button LCD display Program button Temperature buttons Fig. 6 Minimum clearances Model GWH-635-ES TOP (A) 12” FRONT (B) 4” BACK 0” SIDES 4” FLOOR (C) 12” VENT DIAMETER 3”... -
Page 7: General Rules To Follow For Safe Operation
Appliance details General rules to follow for safe Proper location for installing your operation heater B 1. You should follow these instructions when you Carefully select the location of the water heater. For install your heater. In the United States: The your safety and for proper heater operation, you must installation must conform with local codes or, in the provide combustion air to the heater and a proper... -
Page 8: Mounting Installation
Appliance details Clearances The GWH-635-ES is design certified for installation on a combustible wall (see 2.7 Mounting installation) provided the floor covering below the heater is noncombustible. For installations in an alcove or closet, maintain the minimum clearances to combustible and non-combustible materials listed below. - Page 9 Appliance details • Appliances located in confined spaces: The confined space must be provided with two permanent openings, one commencing within 12 inches (304.8mm) of the top and one commencing within 12 inches (304.8mm) of the bottom of the enclosure. Each opening must have a minimum free area of one square inch per: –...
- Page 10 Appliance details The maximum flue gas exhaust temperature on the GWH-635-ES is 437°F (225°C) Venting Exhaust * Exhaust * Exhaust Combustion Combustion Vent pipe Vent pipe Options vent vent vent air pipe air pipe clearances clearances diameter maximum minimum diameter maximum within an within an...
- Page 11 Appliance details The appliance should be located as close to the point Note: reduce 2½ ft for each elbow used after the first of termination as possible. The maximum vent length is 26 feet (8 m) with one 90 degree elbow. Subtract 2½ Vent Safety System feet from the total vent length for each additional 90- The GWH-635-ES will shut down if inadequate exhaust...
- Page 12 Appliance details 2.9.1 Venting options The exhaust vent pipe and combustion air Installing this water heater as a room sealed (TWIN pipe can be run vertically or horizontally. PIPE SYSTEM) is the recommended method. Contact Maximum length for each individual pipe is CEC or dealer for available vent termination kits and 26 feet (8 m) with one elbow, for each vent materials for this water heater.
- Page 13 Appliance details Recommended exhaust vent terminator position Fig. 16 Ref. Description Minimum distance Directly below an opening; operable windows, doors and any non- 36 in mechanical fresh air openings Below a gutter, sanitary pipework or eaves 24 in Below a gutter, sanitary pipework or eaves, protected by metal 12 in shielding From any internal corner...
- Page 14 Appliance details Supporting the exhaust vent system and the use of an external condensate trap External condensate traps B A condensate trap must be used in any sidewall exhaust vent installations when the total vent length is ≥ 8 ft (2.5 m) OR the vent pipe passes through an unheated space (below 60F).
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Page 15: Gas Piping & Connections
Appliance details 2.10 Gas piping & connections Before connecting the gas supply, check the rating plate on the right side of the heater to be sure that the heater is rated for the same gas to which it will be connected. - Page 16 Appliance details FOR NATURAL GAS Pressure drop Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu Maximum Capacity of pipe in Cubic Feet of Gas per numbers given in thousands. Hour for Gas Pressure of 0.5 Psig or less and a Follow boxed numbers for piping just one GWH- 635-ES (example: ¾”...
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Page 17: High Altitude Operation
Appliance details 2.11 Gas line sizing load. Using a manometer, then measure the inlet gas pressure at the inlet gas pressure test port. See Fig. 23. B It is strongly recommended that the Natural Gas pipe Gas pressures lower than 5" W.C. for Natural Gas or be Black Iron pipe the entire distance from the 11"... -
Page 18: Water Connections
Appliance details B Remove the 5 screws on the front retaining bar (see Fig. 24, pos. 1 and 2) being careful not to damage the foam sealant material on it. B Remove the two electrical strip connectors inside the board (Fig. 25) and then loosen the 120V power supply cord retaining nut located underneath the heater. - Page 19 Appliance details reversed, the heater will not function. Be certain there are no loose particles or dirt in the piping. Blow out or flush the lines before connecting to the water heater. Full port valves should be installed on both the cold water supply and hot water outlet lines to facilitate servicing the heater (see Fig.
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Page 20: Electrical Connections
Appliance details 2.14 Electrical connections 2.16 For your safety read before operating your water heater Warning: safety reasons, disconnect the power supply to the Warning: If you do not follow these heater before any service or testing is instructions exactly, a fire or explosion performed. -
Page 21: To Turn Off Gas To Appliance
Appliance details NOTE: on a first time initial installation, existence of air in the gas supply line will cause some ignition delay when the hot water is turned on and result in an error (EA) on the display screen. This is normal. -
Page 22: Temperature Selection
Operation instructions Operation instructions Fig. 29 B Press buttons On/Off switch in order to reach Reset button requested temperature. Program Key Increasing temperature selector Decreasing temperature selector LCD display Power B To start the appliance switch the button to position (I). - Page 23 Operation instructions Setting the water temperature The desired temperature of the hot water can be valve that modulates the burner input in response to adjusted on the front control panel of the heater. both varying hot water flow rates and/or changes in any The GWH-635-ES has an electronically controlled gas incoming and outgoing water temperatures.
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Page 24: Operation
Operation instructions New remote control registration Fig. 35 Fig. 33 Remote control After following instructions indicated “Troubleshooting” section Remote control registration B press reset button in order to make the appliance ON/OFF switch in OFF position (Fig. 29, pos. 1). ready-to-work. -
Page 25: Maintenance And Service
Maintenance and service B Press buttons to select temperature to • Flushing the heat exchanger with a descaling be memorized. solution if mineral build up is evident. Scale build up will shorten the life of the water heater, descale heat B Hold “Program”... -
Page 26: Water Is Too Hot
Troubleshooting on the water heater and prevent an adequate flow of screen is located at the inlet connection to the water water through it. To confirm there is no crossover in heater, disconnecting the main cold supply line at the the plumbing, shut off the cold water supply feed to heater is required. - Page 27 Troubleshooting Display Cause Solution Temperature limiter opened circuit Check connections.* (overheat). No ionization during safety time (safety Check gas pressure. time out). Check that gas is not diluted with air, as a result from recent gas pipeline rework.*. Check if vent terminal is blocked (specially when the appliance starts up for some seconds and then looses ionization signal).
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Page 28: Electrical Diagram
Electrical diagram Electrical diagram Fig. 39 Electrical scheme Intlet water temperature sensor Ionization sensor Water flow sensor Over heat protection Temperature limiter Gas valve Water valve AC Plug Ignition electrode Display PCB ON/OFF switch Fuse T 1,25A Fuse T 3,15A Terminal block Ground post Outlet water temperature sensor... -
Page 29: Gwh-635-Es Functional Scheme
GWH-635-ES Functional scheme GWH-635-ES Functional scheme Fig. 40 Functional scheme 6 720 607 072 (16 January) -
Page 30: Interior Components Diagram And Parts List
Interior components diagram and parts list Interior components diagram and parts list Interior components Fig. 41 Components Cover On/Off switch Reset button LCD display Program button Temperature switches Flue gas collector Mixer Heat exchanger Observation window Inlet air duct Control box Exhaust fan Water valve Gas valve... -
Page 31: Components Diagram
Interior components diagram and parts list Components diagram Fig. 43 Components Diagram 6 720 607 072 (16 January) -
Page 32: Parts List
Interior components diagram and parts list Parts list Item Description Reference Front cover 8 705 421 837 Shield 8 705 506 661 Heat exchanger 8 705 406 285 Heat exchanger top gasket 8 704 701 052 Clip 8 716 102 607 Heat exchanger bottom gasket 8 704 701 054 O-ring... - Page 33 Special adjustment for measuring and adjusting CO2 levels Special adjustment for measuring and adjusting CO levels The CO can only be adjusted by a certified gas adjustment at minimum gas flow (P1) - See technician with a calibrated CO analyzer. table 7.
- Page 34 Special adjustment for measuring and adjusting CO2 levels NOTE: turning screw clockwise decreases level, turning counterclockwise increases it. Caution: Faulty ignition or noisy operation may occur if CO levels are adjusted outside the indicated range. Fig. 46 Adjusting Leave “Program” mode B Turn ON/OFF switch in position OFF and then ON again.
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Page 35: Protecting The Environment
Protecting the environment Protecting the environment Packing The packing box may be fully recycled as confirmed by the recycling symbol Components Many parts in the heater can be fully recycled in the end of the product life. Contact your city authorities for information about the disposal of recyclable products. -
Page 36: Fifteen Year Limited Warranty
General part(s). All such costs must be borne by the Purchaser. Additionally, this warranty does not cover any labor BOSCH PRO water heaters are warranted by the costs associated with service, removal or re-installation Manufacturer (BOSCH) through Controlled Energy of the original water heater or a replaced water heater. - Page 37 Fifteen Year Limited Warranty 6 720 607 072 (16 January)
- Page 38 Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP. 340 Mad River Park VULCANO Termodomésticos S.A. Waitsfield, Vermont 05673 Estrada de Cacia Phone 866-330-2730 3801 - 856 Aveiro - PORTUGAL Fax (802) 496-6924 www.protankless.com techsupport@protankless.com Recycled paper © 2004 Controlled Energy Corporation, Waitsfield, VT all rights reserved...