Honeywell CT70 Bedienungsanleitung

CT70

Heat Pump

Thermostat Wiring Guide

HOW TO USE THIS GUIDE

Before you disconnect the wires and remove your

existing thermostat, be sure this new thermostat, see the

CT70 wiring hookup diagram, will replace it and that you

understand how you will reconnect the wiring. To do that,

proceed as follows:

Step 1

Find the manufacturer of your heat pump in the Table of

Contents, and turn to the appropriate page.

Step 2

Expose the wiring on your existing thermostat (the

subbase) and check that the terminals on your existing

thermostat coincide with the terminals shown in the

second column (Existing thermostat wiring).

If they do, read and follow the installation instructions

provided with the thermostat.

If they do not, call Honeywell Customer Assistance toll

free at 1-800-468-1502, Monday-Friday, 7:00 a.m. - 5:30

p.m. Central time, to be sure you can safely use this

thermostat to control your heat pump.

Before you call, please have the following information

available: thermostat model number and date code, heat

pump model number and manufacturer, and number of

wires connected to the thermostat. The date code is

usually stamped on the back of the thermostat and is a

four-digit number; for example, 9346.

TABLE OF CONTENTS

How to Use This Guide ................................................. 3

Heat Pumps are Different .............................................. 6

Heat Pumps are Two Systems in One .......................... 7

Definitions of Terminal Functions ............................... 8,9

Heat Pump Manufacturers ..................................... 11-22

Amana....................................................................11

American Standard................................................ 20

Arcoaire................................................................. 13

Bard....................................................................... 12

Borg Warner ..................................................... 21,22

B.D.P. (Bryant-Day/Night-Payne) .......................... 14

Carrier ................................................................... 15

Comfortmaker ....................................................... 13

Friedrich ................................................................ 16

Heil Quaker ........................................................... 17

Janitrol................................................................... 12

Lennox .................................................................. 18

Luxaire (Moncrief, Fraser, Johnston) .................... 21

Rheem................................................................... 19

Ruud...................................................................... 19

Snyder General ..................................................... 13

Tappan .................................................................. 12

Tempstar ............................................................... 17

Trane..................................................................... 20

Whirlpool ............................................................... 17

Williamson............................................................. 12

York .................................................................. 21,22

HEAT PUMPS ARE DIFFERENT

Heat pump systems

usually have a

supplemental,

Second Stage

heating system that

operates only when

necessary. This

heat pump

thermostat is

designed to

minimize more

expensive second-

stage operation,

indicated by the

green AUX. HEAT

light on your

thermostat.

HEAT PUMPS ARE TWO SYSTEMS IN ONE

In mild weather, virtually all of the demand for heat in

buildings can be met by the heat pump compressor.

This

First Stage process of moving heat indoors is very

economical. As the air becomes colder outside, the first

stage may be unable to deliver enough heat to maintain the

desired comfort level in the building.

During high heat demand, the thermostat will call for

additional Second Stage power from the auxiliary heat

system.

This auxiliary heat is commonly electric resistance

heat and is two to three times more expensive to operate

than the compressor. If you have specific questions

concerning the operation of your heat pump, please contact

the equipment manufacturer.

INDOOR

AIR

OUTDOOR

AIR

HEAT

TRANSFER

AUXILIARY

HEATING

ELEMENT

OFF

OUTDOORS

MILD WEATHER

INDOORS

M9069

INDOOR

AIR

OUTDOOR

AIR

HEAT

TRANSFER

AUXILIARY

HEATING

ELEMENT

OUTDOORS

SEVERE WEATHER

INDOORS

M9078

DEFINITIONS OF TERMINAL FUNCTIONS

Each terminal of the CT70 controls a different heat pump

function. Here is a list of the possible heat pump

functions:

Function Definition

FIRST STG. HEAT:

When this terminal is activated, the heat

pump is on and heating the living space.

AUXILIARY HEAT:

When this terminal is activated, the

auxiliary heating source is on because the

heat pump is unable to meet the heating

demand of the living space.

FIRST STG. COOL:

When this terminal is activated, the heat

pump is on and cooling the living space.

COMPRESSOR:

When this terminal is activated, the heat

pump is on and either heating or cooling

the living space, depending on the system

switch position.

C/O VALVE HEAT:

Heating Changeover Valve. This terminal

is activated when the system switch is in

the HEAT position. It provides changeover

in heat pumps that change over in

heating.

C/O VALVE COOL:

Cooling Changeover Valve. This terminal

is activated when the system switch is in

the COOL position. It provides

changeover in heat pumps that change

over in cooling.

EM. HEAT:

Emergency Heat. This terminal is

activated when the system switch is in the

EM. HT position. In this situation, the heat

pump is not activated.

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 fan switch in the 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 provisions for one

auxiliary heat load, these loads must be

connected to the AUXILIARY HEAT

terminal.

OUTDOOR

SENSOR:

This terminal is not connected to the

CT70. On your original thermostat, this

terminal was activated by an outdoor

sensor that controlled the auxiliary heat

source.

OUTDOOR STAT:

Outdoor Thermostat. This terminal is

activated when the system switch is in the

EM. HT. position. The outdoor thermostat

controls the amount of auxiliary heat that

is activated.

POWER:

This terminal connects to the power side

of the 24-volt transformer.

COMMON:

This terminal connects to the common

side of the 24-volt transformer.

SYSTEM MONITOR:

Some heat pumps have the ability to

indicate when the heat pump is

malfunctioning. When this occurs, this

terminal is activated and the EM. HT. LED

is activated.

Typical wiring hookup of CT70 with jumper intact.

M8504

GY1

(HOT) L2

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

REMOVE W1-Y1 JUMPER WHEN HEAT RELAY 1 IS USED.

WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR, EM. HEAT. LED

ALSO INDICATES COMPRESSOR MALFUNCTION.

X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION.

COMPRESSOR

CONTACTOR

FAN RELAY

EM. HEAT

RELAY

CHANGEOVER

RELAY (HEAT)

HEAT RELAY 1

CHANGEOVER

RELAY (COOL)

AUX. HEAT

RELAY

SYSTEM

MONITOR

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