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ASHRAE Standard 124 Methods of Testing for Rating Combination Space-Heating and Water-Heating Appliances (ANSI Approved), 2007
- FOREWORD
- 1. PURPOSE
- 2. SCOPE
- 2.1 This test method is intended to cover electric, gas-fired, and oil-fired combination space-heating and water-heating appliances.
- 2.2 This standard covers appliances up to 300,000 Btu/h (87.9 kW) rated input.
- 3. DEFINITIONS AND NOMENCLATURE
- 3.1 Definitions
- 3.2 Nomenclature
- 4. CLASSIFICATIONS
- 4.1 Type I Appliance. An appliance where the space-heating function is provided by heat exchange with low-pressure steam or recirculated nonpotable boiler water.
- 4.2 Type II Appliance. An appliance where the space-heating function is provided by heat exchange with recirculated potable domestic hot water.
- 5. REQUIREMENTS
- 5.1 Space-Heating Performance
- 5.2 Water-Heating Performance
- 5.3 Combined Space-Heating and Water-Heating Performance. Combined space-heating and water-heating performance of the combination appliance shall be determined from calculations as prescribed in Section 11.
- 6. INSTRUMENTS
- 6.1 General. All instruments shall be in working order and be calibrated periodically. Records of periodic calibration shall be kept, and they shall contain, at a minimum, the date of calibration, method of calibration, and reference standard used.
- 6.2 Temperature
- 6.3 Pressure. Gas, oil, air, water, and steam pressure measuring instruments shall be calibrated so that the error is no greater than the following:
- 6.4 Draft. Draft gauges shall have an accuracy of ±0.005 in. wc (1.2 Pa). The divisions on the draft gauge shall be 0.005 in. wc (1.2 Pa) or less.
- 6.5 Combustion Products. Stack and flue CO2 (carbon dioxide) shall be determined with an instrument providing a reading with an error no greater than ±0.1 percentage points.
- 6.6 Weight or Volume. The error associated with the measuring instruments shall not exceed ±1.0% of the quantity measured.
- 6.7 Time. The error associated with timing instruments shall not exceed ±0.5 seconds per hour.
- 6.8 Smoke. Smoke-measuring instruments shall comply with requirements for smoke meters as outlined in ANSI/ ASTM-D-2156-94 (2003), Standard Test Method for Smoke Density in the Flue Gases from Burning Distillate Fuels.5
- 6.9 Energy Flow Rate
- 6.10 Energy Consumption
- 6.11 Higher Heating Value
- 7. APPARATUS
- 7.1 General. Water heaters and boilers shall be installed in the test room in accordance with their manufacturer’s instructions unless required otherwise by a specific method of test.
- 7.2 Type I Appliances
- 7.3 Type II Appliances
- 8. TEST SETUP
- 8.1 General. Type I and Type II combination space-heating and water-heating appliances shall be equipped with the apparatus desc...
- 8.2 Air, Water, and Electrical
- 8.3 Power Input Determination. Initiate normal operation of the appliance and determine the power input, Qin, to the main burner...
- 8.4 Setting the Tank Thermostat, Type II Appliances (where applicable)
- 8.5 Setting Control of Integrated Heater. Starting with a tank of unheated water, initiate normal operation of the unit. After t...
- 8.6 Setting Control of Tankless Heater. Starting with a boiler full of unheated water, initiate normal operation of the boiler. ...
- 8.7 Flow Rate for Simulated-Use Test. The simulated-use test specifies six equal draws of U/6 gallons (L) each during a 24-hour period.
- 9. TEST PROCEDURE
- 9.1 Type I Appliances
- 9.2 Type II Appliances
- 10. DATA TO BE RECORDED
- 11. CALCULATIONS
- 11.1 Space-Heating Function
- 11.2 Water-Heating Function
- 11.3 Space-Heating and Water-Heating Factors
- 11.4 Calculation of Combined Annual Efficiency, CAE. CAE shall be determined from Equation 11-11.
- 11.5 Season Efficiencies
- 12. REFERENCES
- INFORMATIVE ANNEX A Determination of Combined Annual Efficiency (CAE) for Installations with Single-Function Appliances
- REFERENCES
- INFORMATIVE ANNEX B US NATIONAL AND REGIONAL AVERAGE CONDITIONS
- INFORMATIVE ANNEX C LENGTH OF HEATING SEASON [Go to Page]