Honeywell Heat/1Cool User Guide - Page 92
Rheem/ruud
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RHEEM/RUUD COOLING CHANGEOVER (PRE 11/85) (PCA, PNA, PNB TYPICAL) Electromechanical Chronotherm® III Electronic Replacement or Upgrade Chronotherm IV T841A1712 Y594R1425 Y5Y9549G41G4174619 T8T6816111G1R0100400 T8T481411R11R0120802 T8T581511G11G0140721 T8T081011R11R0110406 T8T681611G12G0220802 W890P0CB8190000/2 Function Existing Terminals Common ¿ X X X X C C C C C C Power R R Compressor or Y1 Y Y 1st Stage W1 - Heat Aux. Heat W2 » W2 R R R or Y Y1 Y1 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 - ᕢ W2 Aux. Fan G C/O Valve B Heat C/O Valve O Cool System L Monitor G G G B B B O O O ¾ L G G G G G G B ᕡ B B or O/B B ᕡ B or O/B ᕡ O/B O ᕡ O O or O/B O ᕡ O or O/B ᕡ 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. Heat Loads » W3 LED Indication - 2nd Stage - Compressor W3 W3 W3 ´ ´ ´ - X2 º X1 X2 ¶ X1 X2 ¶ - - - - - - - - ´ ´ ´ - X1 X2 ¶ - - - W2 ᕢ 2nd Stage - - - - - - - - - Y2 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 auxiliary heat loads such as contactors, sequencers, or relays. ¿ Terminal must be connected to the transformer common. ´ If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B) terminal. ² Do not remove factory-installed jumper. ¶ Optional LED indication with completed circuit on X1 and X2 terminals. º Field-installed X2 to X (C) jumper. ¾ LED is energized when terminal is powered. µ L terminal is powered continuously when thermostat is in Em. Ht. position. M13198 70-6627 • 90