1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA DC 3, Annex A-2013Energy-Efficiency Requirements for Programmable ThermostatsNEMA DC 3, Annex A-2013 Energy-Efficiency Requirements for Programmable Thermostats Published by: National Electrical Manufacturers Association 130
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12、. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. DC 3, Annex A-2013 Page i 2014 National Electrical Manufacturers Associati
13、on CONTENTS A.1 Overview . 1 A.1.1 Normative References . 1 A.2 Core Features of a Thermostat . 1 A.2.1 Programming. 1 A.2.2 Program Intervals 1 A.3 Feature Requirements. 1 A.4 Programming Requirements 1 A.5 Setting Requirements 2 A.6 Default Program 2 A.7 Recovery System 3 A.8 Temporary Hold Featur
14、e . 3 A.9 Permanent Hold Feature . 3 A.10 Battery Backup . 3 A.11 Operating Differential of the Thermostat 3 A.12 Cycle Rate Setting and Differential Adjustment Setting . 3 A.13 Operating Differential AND DROOP TEST . 4 A.13.1 Operating Differential Heating Operation. 4 A.13.2 Operating Differential
15、 Cooling Operation . 4 A.13.3 Room Temperature Droop Heating Operation . 4 A.13.4 Room Temperature Droop Cooling Operation 4 A.13.5 Operating Differential 4 A.13.6 Temperature Droop . 4 A.14 Static Temperature Accuracy 4 A.15 Interface Requirements . 5 A.15.1 Indicator for Auxiliary/Emergency Heat 5
16、 A.15.2 Hold/Manual Setting 5 A.15.3 Battery Powered Thermostats . 5 DC 3, Annex A-2013 Page ii 2014 National Electrical Manufacturers Association DC 3, Annex A-2013 Page 1 2014 National Electrical Manufacturers Association A.1 OVERVIEW This annex provides the specifications that are required for a
17、programmable thermostat to be classified as energy efficient. A.1.1 Normative References CSA-C828-06 Performance Requirements for Thermostats Used with Individual Room Electric Space Heating Devices A.2 CORE FEATURES OF A THERMOSTAT A.2.1 Programming The thermostat shall have one or more of the foll
18、owing schedule types: A (5 Day 2 Day) schedule that includes weekdays and weekends A (5 Day 1 Day 1 Day) schedule that allows different weekend day schedules An independent (7 Day) schedule A.2.2 Program Intervals Thermostats shall have at least four possible programming events for each programming
19、period (i.e. wake, leave, return, and sleep settings). See Table 1 for setpoint temperatures. Each setback/setup period shall be at least eight hours long. At least one of these weekly schedules must be shipped as the default program. NOTEZoning systems, home automation, and building control systems
20、 will not be covered in this specification. A.3 FEATURE REQUIREMENTS Thermostats shall have the following features: Pre-Programmed SettingsAt least one of recommended types in A.2.1.- Recovery Systems shall include: o Single stage heating and cooling systems o Multistage heating and cooling systems
21、o Heat pumps with auxiliary heat with sensible management of auxiliary heat stages. Recovery types shall include one or both of the following: o Conventional recovery o Adaptive recovery Long term hold and short term hold features Must maintain schedule during power outages A method by which the the
22、rmostat adapts to application variations (See A.11) Temperature control accuracy to meet required specifications (See A.13 and A.14) Thermostats will have the following additional features based on manufacturers design: Enhanced lighting capability for low lighting conditions Indication for auxiliar
23、y heat / emergency heat operation of multi-stage heat pumps A.4 PROGRAMMING REQUIREMENTS Each thermostat shall have a default permanent weekly schedule of setback/setup times and temperatures for use by the user without any programming procedure on their part. Tables 2 and 3 are examples that may be
24、 used. Each thermostat shall also have programming capability by the user to customize a program that more closely fits their needs. The procedure is to be described for the user. DC 3, Annex A-2013 Page 2 2014 National Electrical Manufacturers Association The thermostat shall provide a mechanism to
25、 restore the thermostat to the default energy-efficient program. A.5 SETTING REQUIREMENTS Setting requirements denote the settings of the default program that would need to be implemented by the manufacturer with no input required from the consumer at the time of purchase and installation. A.6 DEFAU
26、LT PROGRAM Four events provide a basic framework for most consumer needs while providing reasonable levels to attain savings. The setbacks and setups are required to meet or exceed 8 hours. The four event requirements provide an appropriate performance level that all qualified programmable thermosta
27、ts shall provide as long as the setbacks and setups meet or exceed an 8 hour setback/setup period; however, manufacturers may choose to add additional setbacks and/or setups (e.g., some thermostats offer six events). It is acceptable to have two events per day for weekend programs. Table 1 shows the
28、 required setpoint temperatures for the basic four event thermostat. Tables 2 and 3 show acceptable setpoint times and temperatures for weekdays and weekends. Table 1 Programmable Thermostat Setpoint Temperatures Setting Setpoint Temperature (Heat) Setpoint Temperature (Cool) Wake 70F (21C) 78F (25.
29、5C) Leave setback at least 8F (4.5C) setup at least 4F (2C) Return 70F (21C) 78F (25.5C) Sleep setback at least 8F (4.5C) 75F (24C) Table 2 Acceptable Weekday Setpoint Times and Temperature Settings Setting Time Setpoint Temperature (Heat) Setpoint Temperature (Cool) Wake 6 a.m. 78F (25.5C) Leave 8
30、a.m. 5C) 82 28C) Return 6 p.m. 5C) Sleep 10 p.m. 5C) 75F (24C) DC 3, Annex A-2013 Page 3 2014 National Electrical Manufacturers Association Table 3 Acceptable Weekend Setpoint Times and Temperature Settings Setting Time Setpoint Temperature (Heat) Setpoint Temperature (Cool) Wake 8 a.m. 70F (21C) 78
31、F (25.5C) Leave 10 a.m. 62F (16.5C) 82F (28C) Return 6 p.m. 70F (21C) 78F (25.5C) Sleep 10 p.m. 62F (16.5C) 75F (24C) A.7 RECOVERY SYSTEM All programmable thermostat models shall be equipped with a conventional recovery system or an adaptive recovery system. Programmable thermostat models marketed a
32、nd sold for use with multi-stage heat pump systems shall be equipped with a multi-stage heat pump recovery system, which minimizes the auxiliary stages during the recovery period. NOTEManufacturers should be aware that that specific intelligent (or adaptive) recovery system designs may be based on p
33、roprietary technology. A.8 TEMPORARY HOLD FEATURE Programmable thermostats shall have a hold feature that allows the user to temporarily override the program for a specified period, without deleting the program. The programmable thermostat may have more than one way to override the program. For inst
34、ance, a temporary or short term hold may be a programmed amount of time, or an override to the next programmed setpoint. Methods such as “up” and “down” keys are recommended. A.9 PERMANENT HOLD FEATURE When used, the thermostat program is on hold, or manual condition until the “Hold,” or “Manual Con
35、dition” is later removed by the user. A.10 BATTERY BACKUP Programmable thermostats without a battery backup must have technology that stores the energy-efficient default settings permanently. Programmable thermostats must be able to store the users settings permanently. This requires a non-volatile
36、memory in the microprocessor. Clock time memory can be retained for a short time by means of a capacitor. A.11 OPERATING DIFFERENTIAL OF THE THERMOSTAT The thermostat shall have the capability to compensate for the time constant of the thermostat and the variations in the type of heating system and
37、application variations by providing means to either set the Cycle Rate (Cycles Per Hour) of the thermostat, or to change the basic temperature differential of the thermostat. Proper selection will provide a comfortable operating differential (temperature swing) in the heated space. A.12 CYCLE RATE S
38、ETTING AND DIFFERENTIAL ADJUSTMENT SETTING The cycle rate setting or the differential adjustment setting shall be easy for installer to adjust and must remain at the installed setting in the case of an external power outage or battery failure. DC 3, Annex A-2013 Page 4 2014 National Electrical Manuf
39、acturers Association A.13 OPERATING DIFFERENTIAL AND DROOP TEST Conventional and multi-stage heating and cooling programmable thermostats shall be capable of maintaining room temperature regulation as specified in A.13.1 to A.13.4, according to NEMA DC 3 clause 4.5.2. A.13.1 Operating DifferentialHe
40、ating Operation Air velocity 30 feet per minute in the downward direction 50% duty cycle ramp rates 6F (3.3C) / hour up, 6F (3.3C)/hour down Heating functional electrical loads connected with rated loads The acceptable operating differential shall be less than 2F (1.1C) A.13.2 Operating Differential
41、Cooling Operation Air velocity 30 feet per minute in the downward direction 50% duty cycle ramp rates 3F (1.6C) per / hour Up, 3F (1.6C)/hour down Cooling functional electrical loads connected with rated loads The acceptable operating differential shall be less than 2F (1.1C) A.13.3 Room Temperature
42、 DroopHeating Operation Using the above operational parameters of air velocity, air direction, and electrical loads, perform the 20% and 80% duty cycle tests. For the 20% duty cycle, ramp rate shall be 8F (4.4C) / hour up and 2F (1.1C) / hour down. For the 80% duty cycle, ramp rate shall be 2F (1.1C
43、) / hour up and 8F (4.4C) / hour down. The effective value of room temperature droop is the difference between the cut-in points at the 20% duty cycle and the 80% duty cycle. The allowable droop shall be less than 1.5F (0.8C). A.13.4 Room Temperature DroopCooling Operation Using the above operationa
44、l parameters of air velocity, air direction, and electrical loads, perform the 20% and 80% duty cycle tests. For the 20% duty cycle, ramp rate shall be 2F (1.1C)/hour up and 8F (4.4C)/hour down. For the 80% duty cycle, ramp rate shall be 8F (4.4C) /hour up and 2F (1.1C) / hour down. The effective va
45、lue of room temperature droop is the difference between the cut-in points at the 20% duty cycle and the 80% duty cycle. The allowable droop shall be less than 1.5F (0.8C). Individual room line volt electrical space heater thermostats shall be capable of maintaining room temperature regulation as spe
46、cified in A.13.5 and A13.6 and section 4.3 of CSA-C828-06 (Performance Requirements for Thermostats Used with Individual Room Electric Space Heating Devices). A.13.5 Operating Differential The thermostat differential in temperature shall be not more than 0.9F (0.5C) when measured at the center of th
47、e test room (as per clauses 5.1 and 5.2 of CSA-C828-06). A.13.6 Temperature Droop The thermostat droop in temperature shall be not more than 2.7F (1.5C) in absolute value when measured at the center of the test room (as per clauses 5.1 and 5.2 of CSA-C828-06). A.14 STATIC TEMPERATURE ACCURACY For co
48、nventional and multi-stage heating and cooling applications, the accuracy of the temperature setting shall be within plus or minus one degree F (0.6C) of the setpoint temperature under static temperature conditions. DC 3, Annex A-2013 Page 5 2014 National Electrical Manufacturers Association For ind
49、ividual room line volt electrical space heater thermostats, the accuracy shall be within 0.9F (0.5C) of the original thermostat setpoint of 72F (22C) as specified in CSA-C828-06 section 4.3.4. The static temperature measurement accuracy shall be determined by holding the unit in a temperature chamber for one hour at 70F (21C), and comparing the display value to the chamber setpoint 70F (21C). A.15 INTERFAC
