Honeywell Heat/1Cool User Guide - Page 88
Used With A Standard Heat Pump Thermostat
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MAMMOTH USED WITH A STANDARD HEAT PUMP THERMOSTAT Electromechanical Chronotherm® III Electronic Replacement or Upgrade Chronotherm IV T841A1712 Y594R1425 Y5Y95494G1G4174619 T8T681611G11R0100400 T8T481411R11R0120802 T8T5815111G1G0140721 T8T081011R11R0110406 T8T6816111G2G0220802 W890P0CB8190000/2 Function Existing Terminals Common ¿ C X X X C C C C C C Power R R º Compressor Y 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 - µ 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 ¹ L G G G G G G ᕡ or ᕡ or ᕡ B B B O/B B B O/B O/B ᕡ or ᕡ or ᕡ O O O O/B O O O/B O/B Ƹ Ƹ ¹ Ƹ ¹ ¹ L L L L L L Em. Heat - E E E E E E E E E Multiple Aux. Heat Loads · - LED Indication - 2nd Stage - Compressor W3 W3 W3 ¾ ¾ ¾ - X2 ¶ X1 X2 ¸ X1 X2 ² - - - - - - - - ¾ ¾ ¾ ¸ - X1 X2 - µ - - W2 2nd Stage - - - - - - - - - Y2 Cool ³ Configure O/B (select models) in Installer Setup. · Terminal is for multiple auxiliary heat loads such as contactors, sequencers, or relays. » If provided on original equipment. ¿ Terminal must be connected to the transformer common. ´ Do not remove factory-installed jumper. ² Optional CHECK LED on T8611G1004. Connect L to X1; jumper X2 to C. ¶ Field-installed X2 to X jumper. º Both first stage heat and cool are connected to Y terminal. ¾ If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B) terminal. µ When W2 is not used, configure W2 cycle rate to NC. ¸ Optional LED indication activated with completed circuit on X1 and X2 terminals. ¹ LED is energized when terminal is powered. Ƹ L terminal is powered continuously when thermostat is in Em. Ht. position. M13194 TYPICAL THERMOSTATS AND SUBBASES - HONEYWELL MODEL NUMBER (CUSTOMER PART NUMBER) T834C2135 (71116901) T841B1042 (71117001) 70-6627 • 86