520HN
Tankless Water Heater
Engineering
Submittal
Sheet
Overview and Certifications
LOW-LEAD
U P C
®
®
C US
Massachusetts
Plumbing Board
Approved
Engineering Specifications
Water heater shall be a Model Therm 520 HN NG or 520 HN LP. Installation shall consist of ___Model Therm 520 HN NG and ___
Model Therm 520 HN LP tankless water heaters as manufactured by Bosch. Heater shall be CSA listed for the USA and Canada to the current version of standard ANSI Z21.10 / CSA 4.9. Heater shall have an input of 117,000 BTU/hr with a gross output of 91,525 BTU/hr when fired with natural gas or propane. Heater shall operate on natural gas or propane with an AHRI certified performance energy factor of 0.78 and a thermal efficiency of 80%. Tankless water heater shall have a recovery of 145 gallons per hour at a 77°F temperature rise.
CONSTRUCTION
Water heater shall be of gas fired, tankless design with a modulating gas valve and hydro-power generated ignition system allowing the water heater to operate without standing pilot, an electrical connection, or battery. Burner shall be capable of 4:1 turndown of firing, without loss of combustion efficiency. Heat exchanger/combustion chamber shall incorporate a multi pass copper tube and fin design. Heat exchanger shall be rated for
1 of 4
maximum working pressure not less than 150 psig. Vent shall use 5” diameter galvanized B-vent material.
INSTALLATION
All aspects of installation of Water Heater Plant shall be in strict accordance with manufacturer’s instructions. Materials shall conform to all manufacturer’s recommendations including a manufacturer listed vent system.
Water heater plant piping shall be field constructed of materials as specified. Water heater shall be installed with individually isolating shutoff valves for service and maintenance, and a hot water hose connection for field testing. Unit shall have an ASME approved temperature/
pressure relief valve with a setting of 150 psig. Water heater shall require a minimum gas pressure of 4.7“ W.C. (Natural Gas) at 1,000 scfh (full load rated capacity). The water heater shall be provided with an individual supply gas regulator for proper gas regulation with a 3/4” NPT connection.
Bosch Thermotechnology Corp.
Londonderry, NH • Ft. Lauderdale, FL
Bosch Thermotechnology Corp. reserves the right to make changes without notice due
to continuing engineering and technological advances | |
BTC 746008303 B | 10.2014 |
Tel: 1-866-642-3198 Fax: 1-603-965-7581 www.bosch-climate.us |
|
520HN
Tankless Water Heater
Engineering Specifications
MODE OF OPERATION
Control of discharge water temperature shall be set through a dial at the front of the unit with a field adjustment from high to low.
WARRANTY
The heat exchangers shall carry a 15-year limited warranty against leakage due to defects in materials or workmanship or corrosion
in a residential, non-direct recirculation system, subject to the manufacturer’s water quality requirements. All other parts and components shall carry a 2 year limited warranty against defects in materials or workmanship.
Dimensions and Connections
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Front view |
Side view |
Dimensions
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K |
L |
Value |
Inches |
16.73 |
25.75 |
13.15 |
5.11 |
21.25 |
2.55 |
1.18 |
1.97 |
3.82 |
2.50 |
4.92 |
8.66 |
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Bosch Thermotechnology Corp. |
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2 of 4 |
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Londonderry, NH |
• Ft. Lauderdale, FL |
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Bosch Thermotechnology Corp. reserves the right to make changes without notice due |
Tel: 1-866-642-3198 Fax: 1-603-965-7581 |
www.bosch-climate.us |
||
to continuing engineering and technological advances | |
BTC 746008303 B | 10.2014 |
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