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4	FOREWORD FOREWORD 1. PURPOSE 1. PURPOSE 2. SCOPE 2. SCOPE 2.1 This test method is intended to cover electric, gas-fired, and oil-fired combination space-heating and water-heating appliances. 2.1 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. 2.2 This standard covers appliances up to 300,000 Btu/h (87.9 kW) rated input. 3. DEFINITIONS AND NOMENCLATURE 3. DEFINITIONS AND NOMENCLATURE 3.1 Definitions 3.1 Definitions
5	3.2 Nomenclature 3.2 Nomenclature
6	4. CLASSIFICATIONS 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. 4.1 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. 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. REQUIREMENTS 5.1 Space-Heating Performance 5.1 Space-Heating Performance
7	5.2 Water-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. 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. 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. 6.1 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 6.2 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: 6.3 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. 6.4 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. 6.5 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. 6.6 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. 6.7 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 6.8 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 6.9 Energy Flow Rate 6.10 Energy Consumption 6.10 Energy Consumption 6.11 Higher Heating Value 6.11 Higher Heating Value 7. APPARATUS 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. 7.1 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 7.2 Type I Appliances
11	7.3 Type II Appliances 7.3 Type II Appliances
13	8. TEST SETUP 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… 8.1 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 8.2 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… 8.3 Power Input Determination. Initiate normal operation of the appliance and determine the power input, Qin, to the main burner…
14	8.4 Setting the Tank Thermostat, Type II Appliances (where applicable) 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… 8.5 Setting Control of Integrated Heater. Starting with a tank of unheated water, initiate normal operation of the unit. After t…
15	8.6 Setting Control of Tankless Heater. Starting with a boiler full of unheated water, initiate normal operation of the boiler. … 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. 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. TEST PROCEDURE 9.1 Type I Appliances 9.1 Type I Appliances
17	9.2 Type II Appliances 9.2 Type II Appliances 10. DATA TO BE RECORDED 10. DATA TO BE RECORDED 11. CALCULATIONS 11. CALCULATIONS 11.1 Space-Heating Function 11.1 Space-Heating Function
18	11.2 Water-Heating Function 11.2 Water-Heating Function
20	11.3 Space-Heating and Water-Heating Factors 11.3 Space-Heating and Water-Heating Factors 11.4 Calculation of Combined Annual Efficiency, CAE. CAE shall be determined from Equation 11-11. 11.4 Calculation of Combined Annual Efficiency, CAE. CAE shall be determined from Equation 11-11. 11.5 Season Efficiencies 11.5 Season Efficiencies 12. REFERENCES 12. REFERENCES
21	INFORMATIVE ANNEX A Determination of Combined Annual Efficiency (CAE) for Installations with Single-Function Appliances INFORMATIVE ANNEX A Determination of Combined Annual Efficiency (CAE) for Installations with Single-Function Appliances REFERENCES REFERENCES
22	INFORMATIVE ANNEX B US NATIONAL AND REGIONAL AVERAGE CONDITIONS INFORMATIVE ANNEX B US NATIONAL AND REGIONAL AVERAGE CONDITIONS
23	INFORMATIVE ANNEX C LENGTH OF HEATING SEASON INFORMATIVE ANNEX C LENGTH OF HEATING SEASON

Published By	Publication Date	Number of Pages
ASHRAE	2007	28


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Standard Title	ASHRAE Standard 124-2007 Methods of Testing for Rating Combination Space-Heating and Water-Heating Appliances (ANSI Approved)
Published Code	ASHRAE
Publication Date	2007
Pages Count	28

ASHRAE 124 07:2007 Edition

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