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MODEL GWH 2700 ES NG and GWH 2700 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 2700 ES NG - Natural Gas
GWH 2700 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 1 Warning 3 6 Maintenance and service 32 6.1 Annual maintenance 32 6.2 Winterizing for seasonal use 32 2 Appliance details 4 6.3 Mineral scale build-up 33 2.1 Features 4 6.4 Adjusting CO2 (carbon dioxide) 33 2.2 Specifications (Technical data) 5 6.5 Program values 36 2.3 Unpacking the heater 6 6.6 Control board diagnostics 37 2.4 General rules to follow for safe operation 7 2.5 Dimensions and Minimum installation clearances 8 7 Troubleshooting 38 7.1 Introduction 38 7.2 Burner do no
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Warning 1 Warning Warning: The appliance should be located in an area where leakage of the For your safety heater or connections will not result in damage to the area adjacent to the Do not store or use gasoline or other flammable, appliance or to lower floors of the combustible or corrosive vapors and liquids in the structure. When such locations cannot vicinity of this or any other appliance. be avoided, it is recommended that a Warning: Carefully plan where you suitable drain pan, adequately
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Appliance details 2 Appliance details Warning: The anti freeze kit is designed to provide protection for the water heater down to approximately 5°F 2.1 Features for short term conditions only. It will not protect the appliance in areas where the Parts temperature is routinely expected to be • Key Pad interface control below freezing. • High power pre-mix compact burner with low NOx B The anti freeze kit will not protect emissions plumbing outside the appliance from • Modulating Gas Valve with co
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Appliance details Dimensions 2.2 Specifications (Technical data) • Depth (in): 11¼” (286 mm) Approved in US/Canada 7 • Width (in): 17 / ” (452 mm) 8 Capacity • Height (in): 30½” (775 mm) Maximum flow rate: 7.15 GPM (27 l/min) at a 45°F • Weight: 67 pounds (30,5 kg). (25°C) rise. Gas types Maximum output Natural Gas. 160,500 Btu/h (47.0 kW) LP Gas. Maximum input Converting the gas type can only be done by a certified gas technician with a calibrated CO analyzer. 199,000 Btu/h (58.3 kW) 2 Call Bos
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Appliance details To remove front cover 2.3 Unpacking the heater B Loosen the two Philips head screws located on Before installing the unit, be certain you have the bottom rear of cover (see Fig. 3). correct heater for your type of Gas: Propane or Natural Gas. Identification labels are found on the shipping box, and on the rating plate which is located on the right side panel of the cover. Fig. 3 Loosen the two screws B Lift front cover panel upward and remove. Fig. 2 Rating plate A Serial n
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Appliance details B 10. Failure to install heater correctly may lead to 2.4 General rules to follow for safe unsafe operation and void the warranty. operation 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 codes. B 2
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Appliance details 2.5 Dimensions and Minimum installation clearances 1 6 ½" 4 " 16 5 ¼" 1 16 16 2 " 11 ¼" 7 17 " 8 5 ¼" 1 5 + 6 reset 2 P 7 3 4 6720608158-04.2AL Fig. 6 Dimensions 1 On/Off button 2 Reset button Model GWH 2700 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 recommend
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Installation instructions 3 Installation instructions 3.1 Tools required for installation Warning: Approved terminators must be used for inlet and exhaust vent sys- • Philips head screwdriver tems to prevent rain from entering the • Flat head screwdriver appliance. Failure to do so may result in • Adjustable wrench damage to the appliance. This failure is not covered under the manufacturer’s • Level warranty. • Thermometer • Standard plumbing tools Caution: The vent system must be • Manometer in
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Installation instructions Horizontal venting systems only: 3.3.2 Venting Specifications An optional stainless concentric vent/air intake termina- Install appliance as close to point of vent termination as tion can be used to provide only one penetration point possible. The exhaust piping must vent directly to the through the exterior wall (see Fig. 8, 9 & 10). The con- outside of the structure. centric vent/air intake kit can be ordered from your local Horizontal sections of vent must pitch upwa
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Installation instructions Condensate drain requirements # of 90° elbows Air intake or An external condensate drain (not supplied with the Exhaust heater) must be installed under the following system 0 1 2 3 4 conditions: 0 N/A* 26 21 16 11 • All vertical terminating vent installations. • Horizontal terminating vent installations where the 1 N/A* 23 18 13 8 total linear vent length is greater than 10 feet (3.1 m). 2 23 20 15 10 5 • Vent installations where any section of the exhaust # of 45° 3
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Installation instructions Required direct vent terminal clearances (twin pipe / concentric penetration) 6720608836-23.1Av Fig. 11 1) 2) Canadian installations U.S. installations A Clearance above grade, veranda, porch, deck or balcony 12 in. 12 in. B Clearance to window or door that may be opened 36 in. 12 in. C Clearance to permanently closed window * * D Vertical clearance to ventilated soffit located above the vent * * terminator within a horizontal distance of 2 feet (61cm) from the center
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Installation instructions Required other than direct vent terminal clearances (single pipe penetration) 6720608836-23.1Av Fig. 12 1) 2) Canadian installations U.S. installations A Clearance above grade, veranda, porch, deck or balcony 12 in. 12 in. B Clearance to window or door that may be opened 36 in. 4 feet below or to side of opening; 1 foot above opening C Clearance to permanently closed window * * D Vertical clearance to ventilated soffit located above the vent * * terminator within a hor
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Installation instructions 3.3.3 Venting configuration examples Below are approved examples of horizontal venting installations. 4" HORIZONTAL RUN 1/4" PER FOOT DOWN TO TERMINATOR. CONDENSATE DRAIN 6720608542-05.2AL Fig. 15 Horizontal twin pipe penetration 6720608542-02.2AL Below are approved examples of vertical venting installations. Fig. 13 Horizontal side wall venting installation (single pipe penetration)* Important: * Warning: for non-freezing climates only! Note: Pitch horizontal runs dow
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Installation instructions 3.3.4 Vent connections B Attach the flue gas exhaust accessory (8 705 504 162) to the top of the unit (position 1) using the 4 screws and gasket provided. Fully insert stainless steel vent pipe 1.5” minimum into the accessory and tighten the clamp (position 2). NOTE: Vent pipe must be completely ver- tical when inserting or gasket inside ex- i haust accessory can become displaced. Exhaust accessory can be removed with vent pipe attached to check gasket posi- tion. Fi
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Installation instructions 3.3.5 Condensate drain installation Note: Do not install condensate drain in areas where it may freeze. 1. Install condensate drain as close to heater as possi- ble. 2. Use 3/8" ID high temperature silicone tube to con- nect to condensate drain port. Do not use copper pip- ing for any portion of the condensate drain. 3. Form a condensate trap by means of a 3" loop par- tially filled with water. 4. To increase the tube length, connect to end of the high temperature sil
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Installation instructions 3.3.6 Fan speed adjustment Example Exhaust IMPORTANT! Installation adjustment: • 7 - 3' straight sections After installing the water heater, the fan speed values for minimum power (P2) and maximum power (P1) may • 1 - 1' straight section = Total straight pipe length 22’ need adjustment due to variations in altitude and vent • 2 - 90° elbow. pipe length. Intake Failure to make necessary adjustments to fan speed values may result in improper operation of the • 5 - 3' stra
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Installation instructions Natural Gas Liquid propane Altitude Total Minimum Maximum Maximum (above sea equivalent power fan power fan speed power fan speed 1) level) vent length speed (P2) (P1) (P1) 5.5 - 32 ft 7 0 - 2000 ft No No modification required modification required (0 - 610 m) 8 33 - 57 ft For operation at elevations above 2,000 ft (610 m) the 5.5 - 32 ft 8* 48* 47* 2000 - 4500 ft equipment ratings shall be reduced at the rate of 4% for (610 - 1372 m) 33 - 57 ft 8* 49* 48* each
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Installation instructions Attention residents of the Commonwealth of signage installed in accordance with the provisions of Massachusetts: 248 CMR 5.08(2)(a)1 through 4. In the Commonwealth of Massachusetts the following (b) EXEMPTIONS: The following equipment is exempt regulation went into effect on 12/30/2005: from 248 CMR 5.08(2)(a)1 through 4: (a) For all side wall horizontally vented gas fueled 1. The equipment listed in Chapter 10 entitled equipment installed in every dwelling, building or
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Installation instructions below for providing adequate combustion air for the 3.4 Combustion air requirements water heater as well as any other appliances that may consume air in the space. Always follow local codes if Warning: In areas where outside they are more stringent. temperatures routinely come close to freezing, sealed combustion operation When all requirements are followed, the unit will is required. Use twin pipe or concentric operate properly and safely. However, there may still be t
