Honeywell THM5421 Catalog Page
Programmable Thermostats
THM5421 Equipment Interface Module for Prestige® IAQ and VisionPRO® 8000 with RedLINK™
Equipment Interface Module controls up to 4-stages of heat and 2- stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system. Three sets of Universal IAQ contacts to control humidification, dehumidification, and ventilation. Four sensor inputs for wired sensors or dry contact devices.
Application: Gas, oil, electric, heat pump, forced warm air, hot water, steam or gravity
Dimensions, Approximate: 9 5/16 in. High, 4 13/16 in. Wide, 1 5/8 in. Deep (237.4 mm High, 122.5 mm Wide, 40.6 mm Deep)
Color: Gray
Electrical Connections: Screw terminals Electrical Ratings: 18 to 30 Vac
Operating Humidity Range (% RH): 5 to 95% RH, non-condensing Operating Temperature Range: -40 F to 165 F (-40 C to 73.9 C) Currents (Cooling): 1.0 A running
Currents (Heating): 1.0 A running Currents (Fan): 0.5A running Frequency: 50 Hz; 60 Hz
Power Method: Hardwired Mounting: Vertical
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Product Number |
Terminal Designations |
Stages |
Includes |
Used with |
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THM5421R1021/U |
R, RC, RH, C, W-O/B, W2-AUX1, W3- |
Up to 4 |
Heat / 2 Cool Heat Pump or |
— |
Prestige® IAQ 2-Wire |
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AUX2, Y, Y2, G, A-L/A, U1, U1, U2, U2, |
Up to 3 |
Heat / 2 Cool Conventional |
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Thermostat and VisionPRO® |
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U3, U3, S1, S1, S2, S2, S3, S3, S4, S4, |
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Thermostat with RedLINK™ |
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A, B, C, D |
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YTHM5421R1010/U |
R, RC, RH, C, W-O/B, W2-AUX1, W3- |
Up to 4 |
Heat / 2 Cool Heat Pump or |
THM5421R1021 and |
Prestige® IAQ 2-Wire |
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AUX2, Y, Y2, G, A-L/A, U1, U1, U2, U2, |
Up to 3 |
Heat / 2 Cool Conventional |
2 Duct Sensors |
Thermostat and VisionPRO® |
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U3, U3, S1, S1, S2, S2, S3, S3, S4, S4, |
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Thermostat with RedLINK™ |
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A, B, C, D |
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<![endif]>Commercial
<![if ! IE]><![endif]>Components
70-6910 |
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505 |
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