Commercial Thermostats DESCRIPTION Thermostats can provide either temperature control or overtemperature protection by breaking electrical contact when a specified temperature is reached. Honeywell manufactures a wide range of 12,7 mm [0.5 in] commercial snap-action thermostats for possible use in a wide array of small and major appliances, office copy machines, medical equipment, heat detectors, HVAC equipment and more.
Commercial Thermostats NOMENCLATURE The nomenclature given in Figure 1 is provided for reference only. Figure 1. Commercial Thermostat Nomenclature 2 www.honeywell.
DEFINITION OF TERMS • Automatic Reset: A type of thermostat that will automatically reset at a specific temperature (i.e. a thermostat operates at o o o o 65,5 C [150 F] and resets at 48,89 C [120 F]). • Bimetal: Two dissimilar metals bonded together to form the material for manufacturing thermally-sensitive discs which actuate the thermostat. • Close on Rise (COR): Refers to operation of the contacts.
Commercial Thermostats Figure 2. 2450R/2450HR/2455R/2452R/2452HR Series Phenolic Automatic Reset Thermostat The 2450R/2450HR/2455R/2452R/2452HR Series is a single pole, single throw, snap-acting, non-adjustable thermostat which may be used in applications such as power supplies, general appliances and medical equipment. A temperature-sensitive bimetal disc, electrically and thermally isolated from the switch, is used to actuate the normally-closed contacts.
Table 2.
Commercial Thermostats Figure 4. 2450RC/2450RCH/2455RC Series Automatic Reset Thermostat The 2450RC/2450RCH/2455RC Series is a single pole, single throw, snap-acting, non-adjustable thermostat which may be used in applications such as industrial and electrical equipment. A temperature-sensitive bimetal disc, electrically and thermally isolated from the switch, is used to actuate the normally-closed contacts.
Table 6.
Commercial Thermostats Table 8. 2450RCH/2450RC Contact Ratings Life Cycles 100,000 30,000 120 Vac 15 A resistive 125 VA pilot duty 240 Vac 10 A resistive 125 VA pilot duty 120 Vac 15 A resistive 4.4 FLA 26.4 LRA 125 VA pilot duty 240 Vac 10 A resistive 2.2 FLA 13.2 LRA 125 VA pilot duty Table 9. 2455RC Contact Ratings Life Cycles 100,000 100,000 100,000 Note: Additional contact ratings are available, please contact Honeywell. Figure 5. 2450RC/2450RCH/2455RC Basic Dimensions 2450RC 2450RCH 8 www.
Figure 6. 2455RM/2450CM Series Phenolic or Ceramic Manual Reset Thermostats The 2455RM (phenolic)/2450CM (ceramic) Series is a single pole, single throw, snap-acting, non-adjustable thermostat. A temperature-sensitive bimetal disc, electrically and thermally isolated from the switch, is used to actuate the normally-closed contacts. Contacts open when surface or ambient temperatures increase to the operating set point of the calibrated bimetal disc.
Commercial Thermostats Table 12.
Figure 8. 2455RD Series Phenolic Manual Reset The 2455RD Series is a single pole, single throw, snapacting, non-adjustable thermostat. A temperature-sensitive bimetal disc, electrically and thermally isolated from the switch, is used to actuate the normally-closed contacts. Contacts open when surface or ambient temperatures increase to the operating set point of the calibrated bimetal disc. The entire switch is enclosed in a housing; the bimetal disc is retained by a metal heat-conducting end cap.
Commercial Thermostats Table 15.
Figure 10. Series 2455RBV Overmolded Automatic Reset Thermostats The 2455RBV Series has a temperature-sensitive bimetal disc, electrically and thermally isolated from the switch that is used to actuate the normally closed contacts. The contacts open when surface or ambient temperatures increase to the operating set point of the calibrated bimetal disc. The entire switch is enclosed in a phenolic or ceramic housing; the bimetal disc is retained by a metal heatconducting end cap.
Commercial Thermostats Table 18. 2455RBV Series Specifications Characteristic Switch type Reset type Amperage Voltage Operating temperature range Environmental exposure range Materials: Boot Base Contacts Terminals Closure Brackets Approvals Weight Parameter SPST automatic see Table 19 120 Vac to 250 Vac 0 °C to 105 °C [32 °F to 221 °F] -18 °C to 126.
Figure 12. 2450A/2455RA Heat Detection Thermostats The 2450A/2455RA Series is a single pole, single throw, snap-acting, non-adjustable thermostat designed for easy mounting in devices such as fire alarms, security devices and smoke detectors. A temperature-sensitive bimetal disc, electrically and thermally isolated from the switch, is used to actuate the normally-closed contacts. Contacts open when surface or ambient temperatures increase to the operating set point of the calibrated bimetal disc.
Commercial Thermostats Table 21. 2450A/2455RA Series Specifications Characteristic Switch type Reset type Amperage Voltage Operating temperature range Environmental exposure range Materials: Base Contacts Terminals Closure Brackets Approvals Weight Parameter SPST automatic 3A 120 Vac 47,2 °C to 107,2 °C [117 °F to 225 °F] -0 °C to 150 °C [32 °F to 302 °F] phenolic gold flash unplated brass, plated brass aluminum aluminum UL File S1015 and S1389; Guide USCV2 and TAOZ2, UL Standard #521, #217 6 g [0.
Figure 16. 2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” Thermostats The 2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” is a single pole, single throw, snapacting, non-adjustable thermostat designed as a high limit device for applications where automatically resettable thermostats are not desirable. A temperature-sensitive bimetal disc, electrically and thermally isolated from the switch, is used to actuate the normally-closed contacts.
Commercial Thermostats Table 23. 2450R/2455R/2450RC/2455RC/2450HR/2450RCH Series “One Shot” Specifications Characteristic Switch type Reset type Amperage Voltage Operating temperature range Environmental exposure range Materials: Base Contacts Terminals Closure Brackets Approvals Weight Parameter SPST One Shot see Table 24 120 Vac to 250 Vac 2450R/2455R/2450HR/2450RCH: 52 °C to 150 °C [125 °F to 302 °F] 2450RC/2455RC: 52 °C to 260 °C [125 °F to 500 °F] 2450R/2455R/2450HR/2450RCH: 17.
REDI-TEMP THERMOSTATS REDI-TEMP thermostats are pre-configured as shown and are readily available. Figure 18. 3455RC REDI-TEMP Series (See page 6 for specifications and potential applications.) 3455RC B203S Moveable Bracket 23,80 [0.937] 32,26 [1.270] 2X 3,56 DIA [0.140] 17,55 [0.691] 2X 1,7 DIA [0.067] 31,19 [1.228] 11,9 [0.469] 0.51 [0.20] Table 25. 3455RC REDI-TEMP Series Open on Rise Catalog Listing Close Tolerance °C [°F] Table 26. 3455RC REDI-TEMP Series Close on Rise Open Temp.
Commercial Thermostats MOUNTING HARDWARE Figure 19. Brackets B-201, B-201A, B-201B B-203, B-203A, B-203B B-205, B-205A Stationary Surface Movable Surface Air Stream B-203S B-206 A Enclosed B Exposed B-207 3,96 [0.156] 43,05 [1.695] 34,11 [1.343] 25.40 DIA [1.000] B-209 B-210 B-212, B-212A 8,71 R [0.343] 12,70 [0.500] 3,18 [0.125] B-213 20 www.honeywell.com/sensing B-230 11,10 [0.437] 2X 3,73 DIA [0.
Figure 19. Brackets (Continued) B-246 B-249 B-250 B-264 Figure 20. Brass Mounting Studs B-220: 6-32 B-221: 8-32 B-222: 10-24 B-223: 10-32 B-224: M3X0.5 B-225: M4X0.7 B-226: M5X0.8 B-227: M6X1.0 A Undercut to minor diameter B-327 B240 6-32 8-32 10-32 M3X0.5 M4X0.7 M5X0.8 B Specify length B-901 4,1 [0.062] C Specify thread B-902 5,0 [0.17] M4 X 0.
Commercial Thermostats Figure 21. Terminals T-101 T-103 T-106 T-107 Horizontal Solder Special Vertical Solder Inside Vertical Solder Outside T-120 T-141 T-146 T-147 Special Horizontal Weld 1/4 in Quick Connect, Horizontal 1/4 in Quick Connect, Vertical 34,93 [1.375] 15,85 [0.624] 25,40 [1.000] 4,90 DIA [0.193] 1,70 DIA [0.067] 8,64 [0.340] 1,32 [0.052] 3,86 [0.152] 4.57 [0.180] 6.10 [0.240] T-149 T-150 terminal thickness = 0.5 mm [0.020 in] terminal thickness = 0.5 mm [0.
Figure 21. Terminals (Continued) T-179 T-188 T-806 T-807 Vertical Weld Inside Vertical Weld Outside T-849 T-850 T-899 terminal thickness = 0.8 mm [0.032 in] terminal thickness = 0.8 mm [0.032 in] 12,90 [0.508] T-846 2,54 [0.100] 3/16 in Quick Connect, Flat Horizontal 32,5 [1.28] 3/16 in Quick Connect, Vertical 4,9 [0.19] 8,7 [0.
WARNING WARNING PERSONAL INJURY MISUSE OF DOCUMENTATION DO NOT USE these products as safety or emergency stop devices or in any other application where failure of the product could result in personal injury. Failure to comply with these instructions could result in death or serious injury. • WARRANTY/REMEDY Honeywell warrants goods of its manufacture as being free of defective materials and faulty workmanship.
