Honeywell Heat/1Cool User Guide - Page 62
Heat Controller/comfort Air
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HEAT CONTROLLER/COMFORT AIR Electromechanical Chronotherm® III Electronic Replacement or Upgrade Chronotherm IV T841A1712 Y594R1425 Y5Y95494G1G4174619 T8T681611G11R0100400 T8T481411R11R0120802 T8T5815111G1G0140721 T8T081011R11R0110406 T8T6816111G2G0220802 W890P0CB8190000/2 Existing Function Terminals Common ´ C X Power R R · Compressor W1 Y 1st Stage - - Heat Aux. Heat W2 W2 Fan G G C/O Valve - B Heat C/O Valve Y1 O Cool System X Monitor ¿ EM. Heat E E Multiple Aux. - W3 Heat Loads » LED Indication - - X R Y ² W1 X R Y1 ² W1 C R Y1 or Y ² W1 W2 W2 W2 G G G B B B O O O ¾ µ L L C C C R R R Y ² W1 Y1 ² W1 Y ² W1 C C R R Y1 ² W1 Y1/W1 - W2 W2 W2 G G G ³ or B B O/B B ³ or O O O/B O W2 G ³ or B O/B ³ or O O/B ¶ Aux. G ³ O/B ³ O/B µ ¾ µ ¾ ¾ L L L L L E E E W3 W3 - E E - - º º X2 X1 X2 X1 X2 - - E E E - - - º - X1 X2 - ¶ 2nd Stage - - - - - - - - - W2 Compressor 2nd Stage - Cool - - - ³ Configure O/B (select models) in Installer Setup. · Both first stage heat and cool are connected to Y terminal. » Terminal is for multiple second stage loads such as contactors, sequencers, or relays. ¿ If provided on original equipment. ´ Terminal X (C) must be connected to transformer common. - - - - - Y2 ² Do not remove factory-installed jumper. ¶ When W2 is not used, configure W2 cycle rate to NC. º Optional LED indication activated with completed circuit on X1 and X2 terminals. ¾ LED is energized when terminal is powered. µ L terminal is powered continuously when thermostat is in Em. Ht. position. M13217 TYPICAL THERMOSTATS AND SUBBASES-HONEYWELL MODEL NUMBER T874G1469/Q674F1345 70-6627 • 60