York S1 THEH21NS Thermostat R 407C Upgrade your system restoration with Upgrade your system restoration with the Weil McLain 511 330 079 Ignition Module identified by the technical crossover model X9166B10B This thermostat is primarily designed for standard 2H 1C heat pump systems Dual Power Capability: Flexible installation using 24V hardwire or battery power for systems without a common wire
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York S1-THEH21NS Thermostat R-407C Upgrade your system restoration with