Honeywell Heat/1Cool User Guide - Page 61
Geo System
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GEO SYSTEM Electromechanical Chronotherm® III Electronic Replacement or Upgrade Chronotherm IV T841A1712 Y594R1425 Y5Y9549G41G4174619 T8T681611G11R0100400 T8T481411R11R0120802 T8T581511G11G0140721 T8T081011R11R0110406 T8T681611G12G0220802 W890P0CB8190000/2 Function Existing Terminals Common ¿ X X X X C C C C C C Power R Compressor Y 1st Stage - Heat Aux. Heat W2 R R R R R R R R R Y Y Y1 Y1 or Y Y Y1 Y Y1 Y1/W1 ´ ´ ´ ´ ´ ´ ´ - W1 W1 W1 W1 W1 W1 W1 - ¸ W2 W2 W2 W2 W2 W2 W2 W2 Aux. Fan G C/O Valve B Heat C/O Valve O Cool System Monitor/ L System Defrost G G G G G G G G G ³ or ³ or ³ B B B B B B O/B B B O/B O/B ³ or ³ or ³ O O O O O O O/B O O O/B O/B µ µ L X1 ¾ L ¾ L µ L ¾ L µ L µ L EM. Heat E E E E E E E E E E Multiple Aux. W3 W3 W3 W3 º º º º º º Heat Loads » LED Indication - 2nd Stage - Compressor - X2 ¶ X2 ¶ X1 X2 ² - - - - - - - - - X1 X2 - ¸ - - W2 ³ Configure O/B (select models) in Installer Setup. · Terminal X (C) must be connected to transformer common. » Terminal is for multiple auxiliary heat loads such as contactors, sequencers, or relays. ¿ Terminal must be connected to the transformer common. ´ Do not remove factory-installed jumper. ² Optional CHECK LED on T8611G1004. See Fig. 26. ¶ Field-installed X2 to X jumper (provided). º If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B) terminal. ¾ L terminal is powered continuously when thermostat is in Em. Ht. position. µ LED is energized when terminal is powered. ¸ When W2 is not used, configure W2 cycle rate to NC. M13182 TYPICAL THERMOSTATS AND SUBBASES - HONEYWELL MODEL NUMBER T841A1118 70-6627 • 59