Honeywell Heat/1Cool User Guide - Page 89
Used With A Night Setback Thermostat
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Electromechanical Chronotherm® III MAMMOTH USED WITH A NIGHT SETBACK THERMOSTAT Electronic Replacement or Upgrade Chronotherm IV T841A1712 Y594R1425 Y5Y95494G1G4174619 T8T681611G11R0100400 T8T481411R11R0120802 T8T5815111G1G0140721 T8T081011R11R0110406 T8T6816111G2G0220802 W890P0CB8190000/2 Function Existing Terminals Common ² Cµ X X X C C C C C C ¿ Power R1 R R R R R R R R R Night Setback R2 Power Compressor Y 1st Stage - Heat Aux. Heat - - - - - - - - - - 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/ X System Defrost G G G B B B O O O ¹ L G B O Ƹ L G G ᕡ or B B O/B ᕡ or O O O/B Ƹ ¹ L L G G ᕡ B B or O/B ᕡ O O or O/B Ƹ ¹ L L G ᕡ O/B ᕡ O/B ¹ 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 X2 X1 X2 ´ X1 X2 º - - - - - - - - ¸ ¸ ¸ ´ - X1 X2 - · - - W2 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. ¿ Disconnect external timimg device from circuit before wiring replacement thermostat. ´ Optional LED indication activated with completed circuit on X1 and X2 terminals. ² Terminal must be connected to the transformer common. ¶ Do not remove factory-installed jumper. º Optional CHECK LED on T8611G1004. See Fig. 26. ¾ Field-installed X2 to X (C) jumper. µ C terminal is located on terminal strip, not on subbase. ¸ If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B) terminal. ¹ LED is energized when terminal is powered. Ƹ L terminal is powered continuously when thermostat is in Em. Ht. position. M13195 TYPICAL THERMOSTATS AND SUBBASES - HONEYWELL MODEL NUMBER (CUSTOMER PART NUMBER) T874G1378/Q674C1124 T874G1659/Q674C1330 (71115201) T874H1096/Q674C1330 (71115201) 70-6627 • 87