Already a subscriber?
MADCAD.com Free Trial
Sign up for a 3 day free trial to explore the MADCAD.com interface, PLUS access the
2009 International Building Code to see how it all works.
If you like to setup a quick demo, let us know at support@madcad.com
or +1 800.798.9296 and we will be happy to schedule a webinar for you.
Security check
Please login to your personal account to use this feature.
Please login to your authorized staff account to use this feature.
Are you sure you want to empty the cart?
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]