Honeywell THM5421R1021/U - Prestige 2-Wire IAQ Equipment Interface Module
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Honeywell EIM Installation Guide
Versatile Equipment Interface
The Honeywell Home Prestige 2-Wire IAQ Equipment Interface Module is compatible with RedLINK-enabled thermostats. It 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
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