Instruction/ maintenance manual of the product CT70 Honeywell
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1 CT70 Heat Pump Thermostat W iring Guide.
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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.
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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 .
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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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.
An important point after buying a device Honeywell CT70 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Honeywell CT70 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Honeywell CT70 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Honeywell CT70 you will learn all the available features of the product, as well as information on its operation. The information that you get Honeywell CT70 will certainly help you make a decision on the purchase.
If you already are a holder of Honeywell CT70, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell CT70.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell CT70. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell CT70 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
