Tag: Y594

Honeywell Y594 Multistage Thermostat  APPLICATION These thermostats and subbases provide 24 to 30 Vac control for two-stage heating and one-stage cooling heat pump systems as follows: MODEL CHANGEOVER SYSTEM SWITCHING FAN SWITCHING Y594G (T874G/Q674F) Automatic (Heat or Cool) OFF-EM.HT.-HEAT- AUTO-COOL AUTO-ON T874R/Q674L Manual EM.HT.-HEAT-OFF-COOL AUTO-ON OPERATION On a two-heat thermostat, the two stages of heat …