Honeywell Heat/1Cool User Guide - Page 58
Friedrich
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FRIEDRICH 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 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 ² ² ² ² ² ² ² - W1 W1 W1 W1 W1 W1 W1 - µ 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 · · L X1 ¾ L ¾ · L L ¾ L · L · L EM. Heat E E E E E E E E E E Multiple Aux. W3 Heat Loads » LED Indication - W3 W3 W3 - X2 º X2 º 2nd Stage - Compressor - - - ³ Configure O/B (select models) in Installer Setup. · LED is energized when terminal is powered. » Terminal is for multiple second stage heating loads such as contactors, sequencers, or relays. ¿ If multiple auxiliary heat loads are used, connect to W2 (Aux W8900) terminal. ¿ ¿ ¿ ¿ ¿ ¿ X1 X2 ¶ - - - - - - X1 X2 - µ - - W2 ´ Terminal X (C) must be connected to transformer common. ² Do not remove factory-installed jumper. ¶ Optional CHECK LED on T8611G1004. See Fig. 26. º Field-installed X2 to X jumper (provided). ¾ L terminal is powered continuously when thermostat is in Em. Ht. position. µ When W2 is not used, configure W2 cycle rate to NC. M13179 TYPICAL THERMOSTATS AND SUBBASES - HONEYWELL MODEL NUMBER (CUSTOMER PART NUMBER) T841A1324 (AT12124) 70-6627 • 56