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Honeywell CT70 manual

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Table of contents for the manual

  • Page 1

    1 CT70 Heat Pump Thermostat W iring Guide[...]

  • Page 2

    2[...]

  • Page 3

    3 HOW TO USE THIS GUIDE Before you disco nnect the wires and remove your existing thermost at, be sure this new th ermostat, se e the CT70 wiring hookup dia gram, will replace it and that you understand h ow you will reconnect the wiring. T o do that, proceed as follows: St ep 1 Find the manufact urer of your heat pump in the T able of Content s, a[...]

  • Page 4

    4[...]

  • Page 5

    5 TABLE OF CONTENTS How to Use Th is Guide ................ ........... .......... ........ .... 3 Heat Pum ps are Different ........... .......... ........ .......... ....... 6 Heat Pum ps are T wo Systems in One ........... ........ ....... 7 Definitions o f T ermin al Functions ................. .......... .... 8,9 Heat Pum p Manufa cturers ....[...]

  • Page 6

    6 HEAT PUMPS ARE DIFFERENT Heat pum p system s usually have a supplemental, Second S tage heating system that operates only when necessar y . This heat pump thermostat is designed to minimize more expensive second- stage oper ation, indicated by the green AUX. HEA T light on you r thermostat .[...]

  • Page 7

    7 HEAT PUMPS ARE TWO SYSTEMS IN ONE In mild weather , virtually all of the demand for heat in buildings can be met by the he at pump compressor . This First St age proc ess of mov ing heat i ndoors is very economic al. As th e air beco mes col der outside, the fir st stag e may be unab le to delive r enough he at to maint ain the desired comfor t l[...]

  • Page 8

    8 DEFINITIONS OF TERMINA L FUNCTIONS Each terminal of t he CT70 controls a dif ferent heat pump function. Here is a list of the possible heat pump functions: Function Defini tion FIRST STG. HEAT: When this terminal is activated, the heat pump is on and heating the living s pace. AUXILIARY HEAT: When this terminal is activated, the auxiliary heating[...]

  • Page 9

    9 FAN: When this terminal is activated, the fan is on. With the fan switch in the auto position, the fan cycles on and off with the heat pump. With the f an switch in t he ON position, the fan is on continuously . MULTIPLE AUX. HEAT LOADS: This terminal is activated when additional auxiliary heat loads are required. Because the CT70 only has provis[...]

  • Page 10

    10 T ypical wiring hookup of CT70 with jumper inta ct. M8504 W2 W1 X O E G Y1 R L B L1 (HOT) L2 1 POWER SUPPL Y . PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVE W1-Y1 JUMPER WHEN HEA T RELA Y 1 IS USED. WHEN L TERMINAL IS CONNECTED T O SYSTEM MONITOR, EM. HEA T . LED ALSO INDICA TES COMPRESSOR MALFUNCTION. X TERMINAL MUST BE C[...]

  • Page 11

    11 AMANA ! Jumper these two terminal s if both are present # This terminal must b e connected to transforme r common. $ Remove this f actory-inst alled jump er for inde pendent sta ge 1 heat and cool connection. W1 Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1 ST STG. HEAT AUX. HEAT FAN C/O VALV[...]

  • Page 12

    12 BARD/JANITROL/TAPPAN/WILLIAMSON ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. $ Connect multiple second stage heating loads to W2 termina ls. % Thermostat is con nected to eith er O or B terminal, b ut not both. Wiring terminal function Existing thermostat wiring New thermostat wiring COM[...]

  • Page 13

    13 ARCOAIRE/SN YDER GENERAL/COMFORT MAKER ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1 ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT C X R R Y Y1 W1 W1 W2 G[...]

  • Page 14

    14 B.D.P. (BRYAN T-DAY/NIGHT-PAYNE) ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. $ Connect multiple second stage heating loads to W2 termina ls. Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1 ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O [...]

  • Page 15

    15 CARRIER ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1 ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT C X R R Y Y1 W1 W2 W2 G G O O B 1 2 1 L L E E F W1 or [...]

  • Page 16

    16 FRIEDRICH ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. $ T ape of f the end of the wire. Jumper is not required on this thermostat (CT70). Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1 ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VAL[...]

  • Page 17

    17 HEIL QUAKER/WHIRLPOOL/TEMPSTAR ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1 ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT B X R R W W2 G G O O 1 L X E B [...]

  • Page 18

    18 LENNOX ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. R Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER 1 ST STG. HEAT (COMP) 1 ST STG. COOL 2 ND STG. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT X X Y W2 1 E E L M W1 B V/VR Y1 2 F G[...]

  • Page 19

    19 RHEEM/RUUD ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1 ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT X X R R Y Y1 W1 W2 W2 G G O O 1 2 1 L L E E B B[...]

  • Page 20

    20 TRANE/AMERICAN STANDARD ! This terminal must b e connected to transforme r common. # Leave factory-i nstalle d jumper in place. $ T ape off end. CT70 replace s outdo or reset with impr oved zero droop per forman ce. Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER 1 ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT [...]

  • Page 21

    21 YORK/BORG WARNER/LUXAIRE (MONCRIEF, FRASER-JOHNSTON) ! This terminal must b e connected to transforme r common. # Connect multiple second stage heating loads to W2 termina ls. $ Leave factory-i nstalle d jumper in place. % If pres ent on or iginal equipme nt. Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER [...]

  • Page 22

    22 YORK/BORG WARNER ! This terminal must b e connected to transforme r common. # Remove factory-installed jumper . Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER 1 ST STG. HEAT AUX. HEAT FAN 1 ST STG. COOL C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT X2 X R R W1 W1 G G Y1 Y1 2 1 B W2 W2 O L E E or B[...]

  • Page 23

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  • Page 24

    69-0866— 2 C.H. Rev . 01-95 www .hone ywell.com/yo urhome Automation and Control Solu tions Honeywe ll Intern ational Inc. 1985 Douglas Dr ive North Golden Valley, MN 554 22[...]