Honeywell Heat/1Cool User Guide - Page 90

MARTIN INDUSTRIES 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 Y Y 1st Stage - - Heat Aux. Heat W2 W2 R R R Y Y1 Y1 or Y ² ² ² W1 W1 W1 W2 W2 W2 R Y ² W1 R Y1 ² W1 R Y ² W1 W2 W2 W2 R R Y1 ² W1 Y1/W1 - ¶ W2 Aux. Fan G C/O Valve B Heat C/O Valve O Cool System Monitor/ L System Defrost G G G B B B O O O ¾ L G G G G G G ᕡ ᕡ ᕡ or or B B B O/B B B O/B O/B ᕡ ᕡ ᕡ or or O O O O/B O O O/B O/B µ µ ¾ µ ¾ ¾ L L L L L L Em. Heat E E E E E E E E E E Multiple Aux. W3 Heat Loads » LED Indication - 2nd Stage - Compressor W3 W3 W3 º º º - X2 ¿ X1 X2 X1 X2 ¿ - - - - - - - - º º º ¿ - X1 X2 - ¶ - - W2 2nd Stage - - - - - - - - - Y2 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 auxiliary heat loads such as contactors, sequencers, or relays. ¿ LED indication with completed circuit on X1 and X2 terminals. ´ Terminal must be connected to the transformer common. ² Do not remove factory-installed jumper. ¶ When W2 is not used, configure W2 cycle rate to NC. º If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B) terminal. ¾ LED is energized when terminal is powered. µ L terminal is powered continuously when thermostat is in Em. Ht. position. M13196 TYPICAL THERMOSTATS AND SUBBASES - HONEYWELL MODEL NUMBER (CUSTOMER PART NUMBER) T841A1183 T841A1522 T841A1548 (24015808) 70-6627 • 88