2 Heat/1Cool Stage Thermostat with manual changeover and E,O,Y,R,G,X,L,B,W2 terminals for multistage heat pumps
Heat Pump/Multistage Thermostats provide low voltage (24 Vac) control of two-stage heating and one-stage cooling heat pump systems using manual changeover.
Coiled bimetal element operate dust-free mercury switches. Heat anticipators are adjustable or fixed; cooling anticipator is fixed. Mount directly on wall or horizontal outlet box; no separate subbase necessary. T841E model available for two-stage gas valves.
Application Multistage Heat Pumps
Stages 2 Heat/1 Cool
Terminal Designations W3, R, L, X, W2, G, O, E, Y, B
Switch Positions (Fan) AUTO-ON
Switch Positions (System) EM. HEAT-HEAT-OFF-COOL
Switch Type Mercury
Switching Action 1st Stage SPDT; Second Stage SPST
Accuracy (F) 2 F
Accuracy (C) 1 C
Dimensions (in.) 3 1/2 in. high x 5 1/4 in. wide x 2 1/16 in. deep
Dimensions (mm) 89 mm high x 133 mm wide x 52 mm deep
Setting Temperature Range (F) 45 F to 85 F
Interstage Differential Temperature (F) 1 F
Interstage Differential Temperature (C) 0.6 C
Electrical Ratings 20 to 30 Vac.
Anticipator (cooling) 0 to 1.5A fixed
Anticipator (heating) First stage 0 to 1.5A fixed; Second stage 0.1 to 1.2A adj.
Currents (Cooling) 1.5A running, 6.5A inrush at 30 Vac max.
Currents (Heating) 1st Stage 1.5A running, 6.5A inrush at 30 Vac max.;2nd Stage 1.5 running and 6.5A inrush at 30 Vac max.
Currents (Fan) 0.02A to 0.5A running, 2.5A inrush
Sensor Element Bimetal
Fan Operation Auto Fan in EM. HEAT
LEDs AUX.HT., EM.HT.
Ambient Temperature Range (F) 45 F to 85 F
Ambient Temperature Range (C) 7C to 29 C
Replaces Part Numbers: CART841A1217