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GWH 345/450 ESR
Temperature Modulated with Electronic Ignition
Suitable for heating and recirculating potable water
GWH-345/450-ESR-N - Natural Gas
GWH-345/450-ESR-L - 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 and doors, and
causing property damage, personal injury or death.
evacuate the building.
Do not store or use gasoline or other flammable
• Do no
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Index Index 1 Warning 1Warning 2 For your safety 2 Appliance details 4 Do not store or use gasoline or other flammable, 2.1Features 4 2.2 GWH-345/450-ESR Specifications (Technical data) 4 combustible or corrosive vapors and liquids in the 2.3 Unpacking the GWH-345/450-ESR heater 5 vicinity of this or any other appliance. 2.4 General rules to follow for safe operation 6 2.5 Dimensions and minimum installation clearances 7 Warning: Carefully plan where you 2.6Applications 8 install the heater. Cor
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Warning Warning: The recirculating water heater must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0.5 psig (14” W.C.). FCC: This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Caution: Any
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Appliance details 2 Appliance details Temperature Control 2.1 Features Selection range: 115°F (45°C) - 190°F (90°C) Parts Gas Requirement • Sealed combustion burner. Gas connection (inches) - ¾” Safety Inlet gas pressure under operation (with a high hot • Ionization flame sensor water flow rate)* • Over temperature protection. • Propane: 11” - 14” water column High quality materials for long working life • Natural Gas: 5.5” - 8” water column. • Copper heat exchanger * To measure gas pressure, se
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Appliance details Water resistant To remove front cover IP X4 (protection against water drops) The front cover is secured with two screws to prevent unauthorized access. i 2.3 Unpacking the GWH-345/450-ESR Always secure the control panel and front cover with these screws. heater This heater is packed securely. B Loosen the two Philips head screws located as shown in fig. 2. The box includes: • Wall-mounted gas fired recirculating water heater • Bracket and screws for wall hanging the heater
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Appliance details 11.The heater must not be installed in an unheated area 2.4 General rules to follow for safe where temperatures will reach 36°F or lower. If the operation heater is left in an area susceptible to such 1. You must follow these instructions when you install temperatures, drain the unit and disconnect from your heater. In the United States: The installation electrical supply. See Chapter 4.7 for additional must conform with local codes or, in the absence of freeze preventi
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Appliance details 2.5 Dimensions and minimum installation clearances Fig. 4 Dimensions 1 Combustion air inlet adapter (right side only) 2 Exhaust adapter with CO measuring point 2 3 Front cover 4 On/Off button 5 Reset button 6 Recirculating water temperature selector 7 LED - (ON) warning light (blinks when in error lock out) 8 Domestic hot water temperature selector 9 Mounting plate Fig. 5 Minimum clearances Model GWH-345/450-ESR TOP 12” FRONT (B) 4” BACK 0” SIDES ½” BOTTOM 12” Table 1 Minimum c
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Appliance details 2.6 Applications Caution: the water heater which will be used to supply potable water shall not be connected to any heating system or component(s) previously used with a nonpotable water heating appliance. Introduction The application designs provided in this manual are general guides to be used when installing this recirculating water heater. Pump Sizing Required PS pumps are Taco 007 Bronze or Grundfos 15-42B. PZ pumps should be sized by a professional plumb- ing contractor
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Appliance details Pressure drop curves Note: Flow above 6 GPM is not permitted. 50 feet of head GWH 345 ESR 40 feet of head 30 feet of head 20 feet of head 10 feet of head 0 feet of head 0 GPM 1 GPM 2 GPM 3 GPM 4 GPM 5 GPM 6 GPM water flow rate Fig. 8 GWH 345 ESR 50 feet of head GWH 450 ESR 40 feet of head 30 feet of head 20 feet of head 10 feet of head 0 feet of head 0 GPM 1 GPM 2 GPM 3 GPM 4 GPM 5 GPM 6 GPM water flow rate Fig. 9 GWH 450 ESR 2.7 Water quality Water quality can ha
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Installation instructions 3 Installation instructions 3.1 Introduction 3.3 Heater placement and clearances Please follow these instructions. Failure to follow The GWH-345/450-ESR is design certified for instructions may result in: installation on a combustible wall (see 3.4 Mounting installation) provided the floor covering below the • Property damage or personal injury heater is noncombustible. For installations in an alcove •Improper operation or closet, maintain the minimum clearances to • He
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Installation instructions Single pipe Although it is permissible to draw combustion air from inside the structure, it is not the manufacturer’s recom- mended installation method. Always install a 3 inch elbow on the combustion air inlet to prevent foreign objects from falling into the unit (see Fig. 11). Fig. 11 If a single pipe installation is performed. Use the follow- Fig. 10 Mounting the heater ing guidelines when providing adequate combustion air for the recirculating water heater as we
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Installation instructions • Appliances located in confined spaces: The confined space must be provided with two per- manent 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: – 1000 Btu/hr (292.81 watts) if all air is taken from inside the building – 2000 Btu/hr (585.62 watts) if all air is taken from the outside by horizontal ducts – 40
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Installation instructions length is 39 feet with one 90 degree elbow. Sub- 3.6 Venting tract 3 feet for each additional 90 degree elbow used (a maximum of four elbows are permitted in Danger: Do not combination vent this 2) the inlet air supply) . appliance with any other appliance. Horizontal section of vent must pitch upward from heater 1/4" for every foot of horizontal length, to prevent the pooling of condensate, and be supported at 4 foot Warning: Do not reduce the vent intervals with
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Installation instructions Z flex Protech Heat Fab 3” Horizontal TEE only TEE only 9390 TEE terminator Vent pipe 3” Vertical 2SVSRCF03 FSRC3 5300CI terminator Reduce maximum length 6 ft for each 90° FST3 & 90 elbow after the 2SVEVWCF03 93PLSTEE Condensate FSDF3 first one and 3 ft for drain Tee each 45 elbow. Horizontal 2SVEDWCF03 FSHD03 9321 Condensate Combustion drain air intake Vertical 2SVSEVDP03 N/A N/A Condensate drain Fig. 13 Maximum vent and combustion air lengths Condensate
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Installation instructions Fig. 14 Exhaust vent connection 15 6 720 607 909
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Installation instructions Selecting inlet air restrictor Example Note: Before installing the combustion air inlet Exhaust accessory, the appropriate inlet air restrictor must • 10 - 3' straight sections be determined using Tables 6, 7 and 8. • 1 - 1' straight section Refer to Fig. 15 for mounting sequence. Total length 31' B Determine the total length of the straight sections of •1 - 90° elbow 3" stainless steel exhaust and enter that length in line 1. • 1 - GWH 450 ESR termination. B Count
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Installation instructions Use table below to define which restrictor to be used. Combustion air inlet connection The combustion air inlet accessory can only be Total equivalent length (ft) Restrictor Ø connected to the top right of the appliance. The left side must remain sealed. Note: Before installing the combustion air inlet 20 - 38 38 accessory, the appropriate inlet air restrictor must be determined using Tables 6, 7 and 8. 38 - 78 40 Refer to Fig. 15 for mounting sequence. B Place gask
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Installation instructions 3.6.3 Condensate drain requirements 3.6.4 Room sealed installation (Twin pipe) An external condensate drain must always be installed Although it is permitted to draw combustion air from except when using one 90° elbow and less than 3 feet inside, the recommended method is to provide of horizontal pipe. combustion air through a 3" pipe from the outside. See Chapter 3.5 for more direction on combustion air. Note: condensate must be disposed of according to To reduce pres
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Installation instructions 3.6.5 Vertical terminations Over 12/12 to 14/12 5.0 1.52 Caution: Failure to install a Over 14/12 to 16/12 6.0 1.83 condensate drain may result in damage not covered by the manufacturer's Over 16/12 to 18/12 7.0 2.13 warranty. See chapter3.6.3. An approved vent terminator must be used. Over 18/12 to 20/12 7.5 2.27 See Table5 for known approved Over 20/12 to 21/12 8.0 2.44 vertical vent terminations. Table 9 Termination heights at various roof pitches Horizontal runs Int
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Installation instructions 3.6.6.1Requirements for installation in 4. INSPECTION. The state or local gas inspector of the Massachusetts side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the Attention residents of the Commonwealth of inspector observes carbon monoxide detectors and Massachusetts: signage installed in accordance with the provisions of In the Commonwealth of Massachusetts the following 248 CMR 5.08(2)(a)1 through 4.
