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MODEL GWH 2400 ES NG and GWH 2400 ES LP -
INDOOR MODEL
Temperature Modulated with Electronic Ignition
Suitable for heating potable water only
Not approved for space heating purposes
(Intended for variable flow applications)
GWH 2400 ES NG - Natural Gas
GWH 2400 ES LP - Liquefied Petroleum (LP) Gas
Warning: If the information in this manual is not What to do if you smell gas
followed exactly, a fire or explosion may result
• Close gas valve. Open windows.
causing property damage, personal injury
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Index Index 1Warning 3 6 Maintenance and service 27 6.1 Annual maintenance 27 6.2 Winterizing for seasonal use 27 2 Appliance details 4 6.3 Mineral scale build-up 28 2.1Features 4 6.4 Adjusting CO2 (carbon dioxide) 28 2.2 GWH 2400 ES Specifications 6.5 Program values 31 (Technical data) 4 6.6 Control board diagnostics 32 2.3 Unpacking the GWH 2400 ES heater 5 6.7 Fan speed adjustment 33 2.4 General rules to follow for safe operation 6 2.5 Dimensions and Minimum installation clearances 77Troubl
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Warning FCC: 1 Warning This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) For your safety This device may not cause harmful interference, and (2) Do not store or use gasoline or other flammable, this device must accept any interference received, combustible or corrosive vapors and liquids in the including interference that may cause undesired vicinity of this or any other appliance. operation. Warning: Carefully plan where you install th
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Appliance details Maximum input 2 Appliance details 175,000 Btu/h (51.2 kW) Efficiency in % 2.1 Features Thermal efficiency > 82% Parts Min. Input • Key Pad interface control 19,900 Btu/h (5.8 kW) • High power pre-mix compact burner with low NOx emissions Temperature Control • Modulating Gas Valve with constant gas:air ratio Selection range: 100°F (38°C) - 140°F (60°C) control Default temperature: 122°F (50°C) • Modulating water valve for improved comfort and Stability: +/- 2°F (+/- 1°C) temper
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Appliance details Call Bosch Water Heating through Bosch 2.3 Unpacking the GWH 2400 ES thermotechnology corporation for conversion heater instructions. Before installing the unit, be certain you have the Voltage correct heater for your type of Gas: Propane or Natural Gas. Identification labels are found on the 120 V AC (60 Hz) nominal shipping box, and on the rating plate which is located on Amperage the right side panel of the cover. Idle - 40 mA Operation - ≤ 2.5 A Noise 45 - 65 db (A) Sa
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Appliance details To remove front cover 2.4 General rules to follow for safe operation B Loosen the two Philips head screws located on bottom rear of cover (see Fig. 3). B 1. You must follow these instructions when you install your heater. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/ NFPA 54. In Canada: The Installation must conform with CGA B149.(1,2) INSTALLATION CODES and /or local installation
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Appliance details 2.5 Dimensions and Minimum installation clearances Fig. 6 Dimensions 1 On/Off button 2 Reset button Model GWH 2400 ES 3 Program key TOP (A) 12” 4 Power ON or stand-by LED 5 LCD display FRONT (B) 1” 6 Up button 7 Down button BACK 0” SIDES 1” FLOOR (C) 12” Table 1 Minimum clearances Fig. 7 Minimum clearances Note: For servicing access, a 2ft clearance to front cover is recommended. 7 6 720 608 782
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Installation instructions 3 Installation instructions 3.1 Tools required for installation Warning: Proper end terminal / rain cap must be used. Failure to do so may • Philips head screwdriver result in damage to the appliance. • Flat head screwdriver This damage is not covered under • Adjustable wrench the manufacturer's warranty. • Level • Thermometer Caution: The vent system must be installed by a qualified installer in • Standard plumbing tools accordance with these instructions. If •Manome
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Installation instructions upwards towards termination ¼" for every foot of Minimum exhaust vent length horizontal length, to prevent the pooling of condensate, and be supported at 4 foot intervals with overhead hangers. Exception: horizontal run between last elbow and termination must pitch down to termination 1/4" per foot. Note: For horizontal terminations, venting must terminate once it penetrates to the outside of the structure. There must be no sections of vent pipe exposed to the outdoors.
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Installation instructions Recommended exhaust vent terminator position Fig. 10 Ref. Description Minimum distance Directly below an opening; operable windows, doors and any non- 36 in (twin pipe installation) A mechanical fresh air openings 48 in (single pipe installation) Below a gutter, sanitary pipework or eaves 24 in B Below a gutter, sanitary pipework or eaves, protected by metal 12 in shielding C From any internal corner 12 in Above ground or snow pack 12 in D* Above a paved sidewalk 7 ft
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Installation instructions Venting configuration examples Fig. 13 Above the roof clearance requirements from rain cap (combustion air piping not shown) Fig. 11 Horizontal side wall venting installation (combustion air piping not shown) Important: Note: Pitch horizontal runs down toward the heater, except horizontal run between last elbow and termination which must slope down to termination 1/4" per foot. Note: For horizontal terminations, venting must terminate once it penetrates to the outside
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Installation instructions 3.3.2 Condensate drain requirements Room sealed installation (TWIN PIPE SYSTEM) A condensate drain must be installed under the Installing this water heater as a room sealed (TWIN following conditions: PIPE SYSTEM) is the recommended method. Contact your dealer for available vent termination kits and vent • All vertical terminating vent installations materials for this water heater. • Horizontal terminating vent installations where the The exhaust and combustion air pipi
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Installation instructions first one, reduce 1.25 ft for each 45° elbow. Warning: Approved terminators must A maximum of three 90-degree elbows are permitted. be used for inlet and exhaust vent systems to prevent rain from entering Determining installation adjustment the appliance, failure to do so may result The GWH 2400 ES comes factory set to accomodate in damage to the appliance. This failure most common venting arrangements. Determine the is not covered under the manufacturer’s elbows and
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Installation instructions 3.3.3 Vent connections Attention residents of the Commonwealth of Massachusetts: B Attach the flue gas exhaust accessory (8 705 504 In the Commonwealth of Massachusetts the following 151) to the top of the unit (position 1) using the 4 regulation went into effect on 12/30/2005: screws and gasket provided. Fully insert stainless steel vent pipe 1.5” minimum into the accessory and (a) For all side wall horizontally vented gas fueled tighten the clamp (position 2). equipm
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Installation instructions signage installed in accordance with the provisions of 3.4 Combustion air requirements 248 CMR 5.08(2)(a)1 through 4. (b) EXEMPTIONS: The following equipment is exempt Warning: In areas where outside from 248 CMR 5.08(2)(a)1 through 4: temperatures routinely come close to freezing, sealed combustion operation 1. The equipment listed in Chapter 10 entitled is required. Use a concentric "Equipment Not Required To Be Vented" in the most termination or separate terminations
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Installation instructions below for providing adequate combustion air for the B 1. Locate the heater where venting, gas and water heater as well as any other appliances that may plumbing connections are feasible and convenient. consume air in the space. Always follow local codes if B 2. The hot water lines should be kept short and they are more stringent. insulated to save energy. Centrally locating the water This Installation Manual specifies the minimum exhaust heater is recommended to keep ho
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Installation instructions Front cover should be removed (see instructions on page 6) in order to inspect i components visually. Warning: Do not install this appliance on a carpeted wall. The heater must be mounted on a wall using appropriate anchoring materials. If wall is sheathed with plaster or drywall, it is recommended that two support boards, either 1”x4” or 1/2" (minimum) plywood first be attached across a pair of studs, see Fig. 22. B Secure the wall mounting bracket provided with the h
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Installation instructions INSTALLATION CODES and/or local installation Danger: If you have a leak, shut off the codes. gas. Tighten appropriate fittings to stop leak. Turn the gas on and check again Warning: DO NOT connect to an with a gas leak detection solution. unregulated or high pressure propane Never test for gas leaks using a match line or to a high pressure commercial or flame. natural gas line. GAS LINE SIZING Warning: The heater must be isolated The gas supply piping for a single heate
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Installation instructions FOR NATURAL GAS Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3” in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Follow boxed numbers for piping just one GWH 2400 ES (example: ¾” B.I. Natural Gas pipe for 10 ft (3.0m). will handle 278,000 btu’s (81.5 kWh). For multiple appliances combine the total maximum btu input load and then refer to applicable ch
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Installation instructions 3.9 Water connections 3.10 Water quality Water quality can have an impact on appliance Warning: This heater is not approved longevity and may not be covered under the for preheated water applications. manufacturer's warranty. See chapter3.11 for approved For water analysis data call your local water department, recirculating application. or if on a well, have well water analyzed periodically. If water quality exceeds one or more of the values B When facing the heater,
