Honeywell Heat/1Cool User Guide - Page 68
Heating Changeover
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HONEYWELL HEATING CHANGEOVER Electromechanical Chronotherm® III Electronic Replacement or Upgrade Chronotherm IV T841A1712 Y594R1425 Y5Y9549G41G4174619 T8T681611G11R0100400 T8T481411R11R0120802 T8T581511G11G0140721 T8T081011R11R0110406 T8T681611G12G0220802 W890P0CB8190000/2 Existing Function Terminals Common ´ X X X X C C C C C C Power R R Compressor or or Y1 Y C Y 1st Stage - - Heat Aux. Heat W2 W2 R R R or Y Y1 Y1 Y ¿ ¿ ¿ W1 W1 W1 W2 W2 W2 R Y ¿ W1 R Y1 ¿ W1 R Y ¿ W1 W2 W2 W2 R R Y1 ¿ W1 Y1/W1 - W2 Aux. · Fan G G C/O Valve W1 B Heat C/O Valve - O Cool System L Monitor Em. Heat E or K E G G B B O O µ L E E G B O ¸ L E G G ᕡ B B or O/B ᕡ O O or O/B ¸ L µ L G G ᕡ B B or O/B ᕡ O O or O/B ¸ µ L L G ᕡ O/B ᕡ O/B µ L E E E E E Multiple Aux. Heat Loads » W3 LED Indication - 2nd Stage - Compressor W3 W3 W3 ² ² ² - X2 º X1 X2 ¾ X1 X2 ¶ - - - - - - - - ² ² ² ¾ - X1 X2 - · - - W2 2nd Stage - Cool - - - ³ Configure O/B (select models) in Installer Setup. · When W2 is not used, configure W2 cycle rate to NC. » Terminal is for multiple second stage heating loads such as contactors, sequencers, or relays. ¿ Leave factory-installed jumper in place. ´ Terminal X (C) must be connected to transformer common. ² If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B) terminal. - - - - - Y2 ¶ Optional CHECK LED on T8611G1004. See Fig. 26. º Field-installed X2 to X jumper (provided). ¾ Optional LED indication activated with completed circuit on X1 and X2 terminals. µ LED is energized when terminal is powered. ¸ L terminal is powered continuously when thermostat is in Em. Ht. position. M13190 TYPICAL THERMOSTATS AND SUBBASES - HONEYWELL MODEL NUMBER T872N1002/Q672F1133 T872N1028/Q672F1216 T874N1016/Q674F1220 T874N1040/Q674F1261 70-6627 • 66
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