Honeywell Thermostat Q674 User Manual

The T874R Thermostat and Q674L Subbase provide 24 to 30 Vac control of 2-stage heating and 1-stage cool-ing heatpump systems with manual changeover. Q674L Subbase provides EM.HT.-HEAT-OFF-COOL system switching andAUTO-ON fan switching. See Table 1 for specific T874R/Q674L combinations

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