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eLibrary > ANSI/ASHRAE Standard 118.1-2022, Method of Testing for Rating Commercial Gas, Electric, and Oil Service Water Heating Equipment >

ANSI/ASHRAE Standard 118.1-2022, Method of Testing for Rating Commercial Gas, Electric, and Oil Service Water Heating Equipment, 2022

ANSI/ASHRAE Standard 118.1-2022 [Go to Page]
Contents
Foreword
1. Purpose
2. Scope [Go to Page]
2.1 This standard provides test procedures for determining the efficiency and hot-water delivery capability of the water heating equipment to which it applies.
2.2 This standard applies to electric resistance, heat-pump, natural- and propane-gas-fired, and oil-fired water heating equipment, including hot-water supply boilers, with input ratings less than 12,500,000 Btu/h (3660 kW) that are described by one ...
3. Definitions and Symbols [Go to Page]
3.1 Definitions
3.2 Symbols
4. Classifications by Mode of Operation [Go to Page]
4.1 Type I. Unit equipped with a self-contained, temperature-activated primary operating control and not requiring circulation of water for heating.
4.2 Type II. Unit equipped with a self-contained, flow-activated primary operating control and requiring water flow for heating.
4.3 Type III. Unit equipped with a remote temperature primary operating control and requiring circulation through the heater for heating. The remote temperature-activated primary operating control is installed on a matching storage tank provided by t...
4.4 Type IV. Heat-pump water heater supplied without a matching water storage tank.
4.5 Type V. Heat-pump water heater supplied with a matching water storage tank. The water storage tank may be an integral part of the heat pump or supplied as a separate assembly.
5. Requirements
6. Instruments and Test Measurements [Go to Page]
6.1 General. Instruments are required for the following measurements with the degree of instrument accuracy noted. Instruments shall be calibrated at least once per year, and a record shall be kept containing, at least, the date of calibration, the m...
6.2 Temperature. Temperature measuring devices and any associated readout instrumentation shall be in accordance with ASHRAE Standard 41.1 1. The time constant of the thermocouples used for measuring the inlet and outlet water temperatures shall be n...
6.3 Draft. Minimum divisions on the draft gage shall be 0.005 in. of water (1 Pa).
6.4 Higher Heating Value. The measurement of the higher heating value of natural gas, propane, or fuel oil shall be conducted on site.
6.5 Water Flow. A flowmeter at the inlet or outlet may be used in lieu of a weight tank and scale for determining water flow rate and quantity. Conversion to mass flow, where required, shall be based on the specific volume listed in ASHRAE Handbook...
6.6 Smoke. Smoke measuring instruments shall comply with requirements for smoke meters as outlined in ANSI/ASTM D2156 3.
7. Apparatus [Go to Page]
7.1 Test Floor. Free-standing equipment shall be placed on any suitable, level hard flooring. If the water heating equipment is not intended for installation on combustible flooring, suitable noncombustible material shall be placed between it and the...
7.2 Water Piping
7.3 Thermocouple Installation
7.4 Vent Requirements. The water heater shall be connected to the vent pipe as specified in the water- heater manufacturer’s instructions. All pipe joints shall be sealed. Outdoor water heaters that include a weather covering for the flue or vent o...
7.5 Fuel or Energy Consumption Measurement. Install one or more instruments that measure, as appropriate, the quantity and rate of electrical energy, appropriate gas supply, and fuel oil consumed by the water heating equipment.
7.6 Heat-Pump Water-Heater Components. The water pump provided by the manufacturer as part of the appliance shall be used. For heat-pump water heaters that require a circulating pump but where none is provided, a water pump capable of meeting the man...
7.7 Requirements for Heat-Pump Water-Heater Testing. Water heating performance is evaluated as a function of entering condenser water temperature as described in Table 3, and the following additional test information.
8. Methods of Testing [Go to Page]
8.1 General. The water heating equipment shall be installed and operated in accordance with the manufacturer’s instructions unless specifically required otherwise by the test method. The water heating equipment shall be equipped with the apparatus ...
8.2 Energy Supply
8.3 Inlet and Supply Water Temperature and Pressure. The supply water temperature shall be 70°F ± 2°F (21°C ± 1.1°C) for Types I and II equipment and Type III equipment where a higher inlet water temperature is not specified by the manufacturer...
8.4 Room Ambient Temperature. Maintain the ambient air dry-bulb temperature, Tahc, of the test room at 75°F (23.9°C) with a test operating tolerance of ±10.0°F (±5.6°C) for input rating and water heating capacity tests, except as required for A...
8.5 Storage Capacity for Standby Loss Testing. For water heaters subject to standby loss testing, the volume of Types I and V water heaters with capacities of 60 gal. (230 L) or less, and the volume of Types II and III water heaters with capacities o...
8.6 Power Input Adjustment
8.7 Water Temperature Control
9. Test Procedures [Go to Page]
9.1 Input Rating, Heating Capacity, Thermal Efficiency, Coefficient of Performance (COP), and Recovery Rating. The following test methods apply to gas and oil-fired equipment, heat-pump water heaters (HPWHs), and electric resistance models that do no...
9.2 Standby Energy Consumption
9.3 Heat-Pump Water-Heater Water Heating Output. The water heating capacity of the heat-pump water heater shall be determined using test method Type IV or Type V, as applicable.
10. CALCULATION OF RESULTS [Go to Page]
10.1 Ratings for Models not Tested. Where there is sufficient similarity in design between different models of Types I, II, III, IV, and V water heating equipment, such that their differences will not significantly affect performance, ratings for unt...
10.2 Thermal Efficiency and Recovery Rating for Type I, Type II, and Type III Equipment
10.3 Heat-Pump Water-Heater Water Heating Capacity, Coefficient of Performance (COP), and Recovery Rating. The water heating capacity and COP of Type IV and Type V heat-pump water heaters are determined using data collected with the applicable test m...
10.4 Standby Energy Consumption
11. References
Normative Appendix A: Specified Source Test Conditions for Heat-Pump Water Heaters
Informative Appendix B: Correction to Heating Value, H, for a Fuel Gas [Go to Page]
B1. EXAMPLES [Go to Page]

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