Honeywell T8078C User Manual

LOW VOLTAGE MODULATING CONTROLLER

y

g

y

APPLICATIONS

The T8078C digital electronic controller is designed for individual zone control of terminal units in fan coil and air conditioning systems.

The controller provides position control of valves or dampers (for airside control), and is capable of mounting on a switching sub-base for manual control of the fan speed.

T8078C has great applications flexibility built-in – all applications and control modes can be selected simpl bysettinga bank of switches inside the product. Control parameters are also adjusted by means of onboard switches.

T8078C also supports a number of features that enhance the applications capability. These include remote sensin an external input), remote setpoint adjustment, and heat/cool changeover.

Installation and commissionin special fast commissionin internal valve synchronisation, simple user dia LED indication, and the provision of a dia output.

, energysavings mode (activated from

are assisted bya

checkout sequence,

nostic nostic

T8078C

PRODUCT SPECIFICATION SHEET

FEATURES

• Modern styling makes T8078C ideal for locating in the occupied space, particularly in offices and hotels.

• Proportional + Integral (P+I) control form ensures close temperature control under all operating conditions.

• Control modes and applications configured by onboard switches.

• Choice of control Modes:

- 3-position modulating

- thermal predictive modulating (TPM)

- On/off

• Choice of Applications:

- 2-pipe fan-coil cooling

- 2-pipe fan-coil heating

- 2-pipe fan-coil cooling +2-stage on/off heating

- 2-pipe fan-coil heating +2-stage on/off cooling

- 2-pipe fan-coil heat/cool changeover

- 4-pipe fan-coil heat + cool in sequence

• Choice of control parameters:

- 1, 2, or 4 K for the Proportional Band

- 2, 4 K for the Zero Energy Band

• Automatic heat/cool changeover is achieved b using a remote switch, or a pipe thermostat (S4390A1004) on the supply water pipe.

• Control setpoint can be remotely adjusted by ±±±±5K.

• Energy Savings Input - a local contact closure or a

central voltage input will switch T8087C to Energ Savings Mode, where the cooling and heating setpoints will change to pre-defined setup and setback temperatures, enabling maximum energ efficiency. Setup/setback values can be set 2-8K b means of an on-board potentiometer.

• Sensor options: On-board or external (Wall mounted, or Remote/return air). The connection of an external sensor is detected automatically.

• Valve commissioning sequence for fast system check.

• Periodic valve exercise and synchronisation.

• Simple user diagnostics capability – by means of a

flashing LED mounted inside the thermostat cover.

• Diagnostic output – for communication of diagnostic system information to a PC tool.

• Extra wide Input Voltage Specification : 18 – 30 Vac.

• Automatic calibration offset over full voltage range.

• Suitable for mounting either on the terminal unit or

on the wall (surface or wall-box mounting).

• Wiring access from the rear, and surface wiring knockouts at the top and sides.

• Locking front cover.

1 EN0R8535 R1 2003

INDEX OF CONTENTS

Page Contents 1 APPLICATIONS OVERVIEW 1 FEATURES OVERVIEW 3 SPECIFICATIONS 4 PRODUCT APPLICATIONS TABLE 4 SYSTEM ARCHITECTURE 5 OPERATION

5 Control Modes 5 Operating Modes 5 Comfort Mode 5 Energy Savings Mode 6 Startup & Commissioning 7 Diagnostics & Fault Indication

8 ORDERING INFORMATION 8 SYSTEM & PARAMETER SELECTION SWITCHES

8 How to Configure T8078C

9 INSTALLATION

9 Location 9 Mounting 9 Wiring 9 Layout & Terminal Connections

10 APPLICATIONS – MODULATING CONTROL

10 (1) Modulating Cooling 10 (2) Modulating Heating 11 (3) Modulating Cooling + 2-Stage On/Off Heating 11 (4) Modulating Heating + 2-Stage On/Off Cooling 12 (5) Modulating Heat / Cool Changeover 12 (6) Modulating Cooling + Heating Sequence

13 APPLICATIONS – ON/OFF CONTROL

13 (7) On/Off Cooling 13 (8) On/Off Heating 14 (9) On/Off Cooling + 2-Stage On/Off Heating 14 (10) On/Off + 2-Stage On/Off Cooling 15 (11) On/Off Heat / Cool Changeover 15 (12) On/Off Cooling + Heating Sequence

16 APPLICATIONS – TPM CONTROL (THERMO-ELECTRIC ACTUATORS)

16 (13) TPM Cooling 16 (14) TPM Heating 17 (15) TPM Cooling + 2-Stage On/Off Heating 17 (16) TPM Heating + 2-Stage On/Off Cooling 18 (17) TPM Heat / Cool Changeover 18 (18) TPM Cooling + Heating Sequence

19 ADDITIONAL FEATURES

19 Auto Heat / Cool Changeover 19 Remote Temperature Sensing 20 Remote Setpoint Adjustment

20 SUITABLE VALVES & ACTUATORS 20 OPTIONAL ACCESSORIES

2 EN0R8535 R1 2003

SPECIFICATIONS

Power Supply:

Power Consumption:

Output Load Rating:

Setpoint Range:

Configuration/System Selection:

Control Modes:

Applications Systems:

Proportional Band (Xp):

Zero Energy Band (ZEB):

Interstage Differential (ID):

Control Point Stability:

Ambient Temperature Range:

Storage Temperature Range:

Relative Humidity:

Remote Setpoint Adjustment:

Energy Savings (Setup/Setback):

Heat/Cool Changeover:

Mounting:

Wiring:

Enclosure:

Dimensions:

Protection Class:

Approvals:

Sensors:

24 Vac nominal 50/60Hz, operating range 18 – 30 Vac

1.2 VA nominal (electronics only)

0.3 A (maximum) for all outputs at 24 Vac, with solid state switching 15 to 30 °C

Made via a bank of 6 on-board dip switches 3 different Control Modes :-

Modulating : 3-position modulating P+I control, based on adjustable proportional Band

(Xp), and 150sec valve run-time

On/Off : Primary stage control is P+I on/off output based on adjustable

Proportional Band (Xp) and a fixed cycle rate (6 cycles/hour Cooling, 6 cycles/hour heating)

: Secondary stage control is P+I on/off output based on a fixed Proportional

Band of 1K and a fixed cycle rate (6 cycles/hour Cooling, 12 cycles/hour heating)

TPM : Special on/off control mode for thermo-electric actuators 6 different Applications System types :-

• Heat / Cool Changeover

• Cooling Only

• Cooling + optional 2-stage On/off Heating

• Heating Only

• Heating + optional 2-stage On/off Cooling

• Heating + Cooling Sequence Control

1K, 2K, or 4K (depending on system) selected using DIP switches 1K for secondary 2-stage Heating or Cooling stage control 2K or 4K selected using DIP switches

Fixed at 1K, for Systems with secondary 2-stage Heating or Cooling ±0.5K at 20°C Operating range 0 to 40 °C

-20to55°C 10 to 90%, non condensing

±5K by remote unit, resistance input (Q979B1029, Q979C1036) 2 to 8K setup/setback possible, by means of external contact closure input Value set by potentiometer on T8078C Contact closure can be local or central, to control a group of T8078C (up to 50 max) Automatic changeover by means of external contact closure input Input can be local (from aquastat) or central from switch/relay (controls up to 50 max) Directly onto wall or wall-box (65x65mm junction box with 60mm screw pitch) or inside terminal unit or fan-coil Also mounts on fan speed subbase Q6360A1025 Mounting accessory F42007789 available for other mounting configurations 14 x screw terminals capable of accepting up to 1.5mm² stranded cable Max length of wiring to actuators is 100m @ 1.0mm², 150m @ 1.5mm² Flame retardant plastic housing

83.5 x 83.5 x 40 mm IP30 (IEC144) CE mark, conforming as follows :

Directive (Amendments) 73/23/EEC (93/68/EEC) EN60730-1:2001

89/336/EEC (93/68/EEC & 92/51/EEC) EN55014-1:1997

On-board sensor , type NTC100K Remote sensor T8109C1002 (1.5m cable) auto detected on power-up Maximum sensor extension is 20m (using screened cable)

Standards Applied

EN60730-2-9:1995

EN55014-2:1997

3 EN0R8535 R1 2003

PRODUCT APPLICATIONS

Basic Application Controlled Device Control Mode – details of application Application No.

2-pipe fan-coil Valve control Modulating cooling 1

“ Modulating heating 2 “ On/off cooling 7 “ On/off heating 8 “ TPM cooling (thermo-electric actuator) 13 “ TPM heating (thermo-electric actuator) 14

Airside control (damper) Modulating cooling 1

“ Modulating heating 2

Terminal unit Damper control Modulating cooling 1

“ Modulating heating 2

2-pipe fan-coil with auxillary electric heat Valve control Modulating cooling + 1or 2-stage on/off heating 3 (1 or 2-stage electric heating elements) “ On/off cooling + 1or 2-stage on/off heating 9

“ TPM cooling + 1or 2-stage on/off heating 15

Airside control (damper) Modulating cooling + 1or 2-stage on/off heating 3

2-pipe fan-coil with auxillary cooling Valve control Modulating heating + 1or 2-stage on/off cooling 4 (1 or 2-stage chillers) “ On/off heating+ 1or 2-stage on/off cooling 10

“ TPM heating + 1or 2-stage on/off cooling 16

Airside control (damper) Modulating heating + 1or 2-stage on/off cooling 4

2-pipe fan-coil with heat/cool changeover Valve control Modulating heat/cool changeover 5

“ On/off heat/cool changeover 11 “ TPM (thermo-electric actuator) heat/cool

changeover

4-pipe fan-coil Valve control Modulating cooling + heating in sequence 6

“ On/off cooling + heating in sequence 12 “ TPM cooling + heating in sequence 18

Airside control (damper) Modulating cooling + heating in sequence 1 or 2

17

SYSTEM ARCHITECTURE

A diagram of compatible T8078B system components is shown below.

Q979C1036

REMOTE SETPOINT

Q979A1020

SPACE TEMP

SENSOR

REMOTE SETPOINT

Q979B1029

ADJUST UNIT

ML6161

ML6161 ML6174

ML6174

N2024

N2024 N3424

N3424

+ SENSOR

T8109C1002

T8109C1002 SENSOR

SENSOR

T8078C CONTROLLER

MODULATING THERMAL ON/OFF

ACTU ATORs ACTUATOR ACTU ATOR

M7410C

M7410C M6410C

M6410C

Q6360A1025 SUB-BASE

VALVES

M100

Z100

M8450

ENERGY SAVINGS INPUT

HEAT/COOL CHANGEOVER

S4390A1004

S4390A1004 PIPE STAT

PIPE STAT

V5822C

V5822C V5832C

V5832C

V5823A

V5823A V5833A

V5833A

V5823C

V5823C V5833C

V5833C

4 EN0R8535 R1 2003

OPERATION

g

gy

y

Control Modes

T8078Cgives a choice of 3 different output control modes, to suit a range of different actuators and system requirements.

Modulating Control

3-position modulating control is a control form that exactly positions the control valve in order to satisfy the cooling or heating demand. For each valve actuator there are 2 control outputs, one to drive the valve open, and another to drive the valve closed. The controller can send out control pulses to each of these outputs to move the valve to any position between fully closed and 100% open. The required valve position is calculated using a P+I algorithm, with an adjustable Proportional Band (Xp), and valve actuator run-time of 150seconds. This type of control gives optimum performance over a wide range of conditions.

On/Off Control (with P+I input)

The on/off control form used by T8078C is one where the output is cycled on and off with a fixed cycled period. The on-time is adjusted by a P+I algorithm so the heating or cooling demand is met and the space is controlled to setpoint. The cycle rate is 6cycles/hour for cooling and heating. For the primary control stage, the Proportional Band (Xp) can be selected to be either 1, 2, or 4K, depending on the system. For the secondary control stages, the Proportional Band is fixed at 1K and the cycle rate is 6cycles/hour for cooling, 12cycles/hour for heating. This type of on/off control ensures closer control to setpoint than conventional on/off control based on a temperature differential.

TPM Control (for Thermo-Electric Actuators)

Thermo-electric (or thermal) actuators are very cost effective devices, but they present particular difficulties to control because of the time-lags in their response to control inputs. Therefore T8078C uses a special Thermal Predictive Modulating (TPM) control to operate thermal actuators in the optimum way. This type of on/off control ensures closer control performance when using thermal actuators than conventional on/off control or pulse-width modulating control.

Operating Modes

T8078C has 2 main operating modes,

Energy Savings Mode Commissioning Mode

, and also has a

which is entered immediately on

power-up.

Comfort Mode

This is the normal operating mode, where T8078C controls to the setpoint selected by the user.

Comfort Mode

Startup /

and

Energy Savings Mode – continued

In Energy Savings Mode the Setup/Setback values can be set between 2-8K by means of an on-board potentiometer. In cooling only systems (1, 7, 13) the setpoint will be increased (setup) by the set value fixed by the potentiometer. In heating only systems (2, 8, 14) the setpoint will be decreased (setback). In heat/cool changeover systems (5, 11, 17) the heating setpoint will be decreased in heating mode, and the cooling setpoint will be increased in cooling mode. In coolin

+ heatingsystems (anysystem with a Zero Ener Band) the cooling setpoint will be increased by the set value and the heating setpoint will be decreased by the same amount. The setpoint remains the same, but the effect is to widen the Zero Ener

Band.

Energy Savings - From Central Location

A group of T8078C units can be switched to Energy Savings mode using a central switch. A maximum of 50 units can be switched this wa the polarity of wiring connections is correct. Each T8078C controller will switch to its own pre-defined setback values, as set by its on-board potentiometer.

Input Wiring Connections

Single Unit Energy Savings

T8078C

Central Energy Savings

T8078C

, but extreme care must be taken to ensure

14

Switch should be rated 30 Vdc

13

0.5 mA nominal

12

12 11

11 10

10

9

9 8

8 7

7 6

6 5

5 4

4 3

3 2

2 1

1

Switch should be rated 30 Vdc

0.5 mA nominal

11

11 10

10

11

11 10

10

= Normal Operation

= Energy Savings Mode

= Normal Operation

= Energy Savings Mode

Energy Savings Mode

T8078C has an Energy Management System, where the detection of an external input signal will cause the cooling and heating setpoints to change to pre-defined setup and setback temperatures, enabling maximum energy efficiency. This input signal must be in the form of a contact closure, connected to terminals 10 and 11.

11

11 10

10

x 50 units maximum

Take care to always observe polarity of connection

5 EN0R8535 R1 2003

Energy Savings Mode - Examples

Startup & Commissioning

On power up, T8078C will immediately undergo a test and synchronisation sequence to enable Installers and Commissioning Engineers to test the system is wired correctly.

Test Sequence

For all control modes, the test sequence will last 60 seconds, and will consist of switching the 4 control outputs on and off in the sequence illustrated. The outputs are connected to terminals 3, 4, 6, and 7. If it is necessary to repeat the sequence, the power supply can be switched off then back on again.

Valve Synchronisation

The synchronisation sequence will depend on what type of

Control Mode

For modulating systems, the test sequence will be followed by a 3 minute valve synchronisation, where the valves will be driven to the closed position in order to establish a baseline control reference. For on/off and TPM control systems, the valve closure sequence will last 10 seconds. The synchronisation sequence will be repeated 12 hours after power up, and thereafter every 24 hours. This is designed to ensure there will be no disturbance to temperature control during normal hours of building occupancy. The Diagnostic LED will pulse on and off in the sequence illustrated for Terminal 3 if no faults are detected (see Section entitled ‘Diagnostics & Fault Indication’ for a complete description).

has been selected.

6 EN0R8535 R1 2003

Diagnostics & Fault Indication

y

T8078C provides simple user diagnostics and fault indication using an LED, positioned at the bottom right side of the printed wiring board. The T8078C cover must be removed to view the LED correctly. By pulsing the LED on and off in predefined sequences, T8078C is able to indicate valve position, heating or cooling demand, or whether a fault has been detected. The tables and graphs opposite give details of the how to interpret the LED outputs.

Fault Indication

If a fault is detected, this will be indicated as highest priority. Faults are indicated by 1, 2, or 3 LED pulses, followed b second delay, then a repeat of the pulse sequence. Most detectable faults are due to errors in reading sensor or setpoint values. In the unlikel

event of an internal sensor or unit setpoint fault, the controller must be replaced. If a remote sensor fault is indicated, it is likely to be a bad connection, so all wiring connections should be checked.

Valve Position / Cooling or Heating Demand

Valve position or cooling/heating demands are indicated by an initial code sequence of pulses, followed by the position or demand data, and this is repeated on a fixed cycle rate. The duration of the data pulse provides the important information, for example :

Valve position

The LED is switched on for a duration proportional to the valve position, where 10s on = valve fully open

On/off or TPM demand

The LED is switched on for an amount proportional to the on-period of the cycle, where 10s on = 100% demand. T8078C will only provide demand or position data on the current operating output, and this will be indicated by the initial pulse sequence of 1, 2, or 3 pulses. The table below shows how to determine current operating mode & demand for each of the 18 possible control options.

a6

Suggested ActionFault

Replace controllerInternal Sensor out of range

Check sensor connectionsRemote Sensor out of range

Replace controllerFaulty setpoint measurement

7 EN0R8535 R1 2003

ORDERING INFORMATION

T8078C1009 : Controller

Accessory Products

Q979A1020 Q979B1029 Q979C1036

T8109C1002 S4390A1004 Q6360A1025 F42007789-001 F42006646-001

: Wall-mounted Remote Sensor : Remote Setpoint Adjustment Unit (±5K)

: Remote Sensor + Setpoint Adjust Unit : Remote Sensor (1.5m cable) : Pipe-mounted Changeover Thermostat : Fan Speed Switching Sub-base : Wall-plate : Range-stops

SYSTEM&PARAMETER SELECTION SWITCHES

T8078C uses a bank of 6 switches to enable configuration of the Control MODE, the Applications SYSTEM, and appropriate Control Parameters, such as PROPORTIONAL BAND (Xp) and ZERO ENERGY BAND (ZEB).

These switches are located on the wiring board underneath the cover, on the bottom left hand side.

See the diagram below for an explanation of the switch settings.

How to Configure T8078C

(1) Select Control Type, using switches S1 and S2

The choices are :

TPM (optimised for thermal actuator control) On/off Modulating (3-position control) – sometimes also known as ‘Floating’ control.

(2) Select System Type, using switches S3 and S4

The choices are :

1-stage cooling (+ optional 2-stage on/off heating) 1-stage heating (+ optional 2-stage on/off cooling) 1-stage heat/cool changeover (activated by external input signal) heat + cool sequence control

(3) Select Control Parameters, using switches S5 and S6

Proportional Band X

Zero Energy Band ZEB = 2K or 4K

= 1K, 2K or 4K (also dependant on system type)

p

8 EN0R8535 R1 2003

INSTALLATION

j

Location

T8078C may be located on the wall in the space to be controlled, or on the body of the terminal unit.

With In-built Temperature Sensor

T8078C is supplied with a built-in temperature sensor. If this is to be used, then T8078C is the critical temperature control element in the air-conditioning system, and must be located about 1.5m above the floor in a position with good air circulation at room temperature.

With Remote Temperature Sensor

T8078C supports remote temperature sensingfrom a rangeof remote sensors or modules. In this case it is the position of the sensor that is critical :

• for return air sensing the remote sensor must be positioned within the terminal unit, duct, or plenum, in the return air stream where it is not affected by other influences

• for room temperature sensing the remote sensor or module must be located as for a T8078C with in-built sensor.

Please note :

1. The maximum cable run between T8078C and remote

sensor is 20m, and screened cable must be used.

2. T8078C uses it’s in-built sensor, unless it automatically

detects the presence of the remote sensor at power-up. So the T8078C must be powered down then back up again after a remote sensor is connected.

Mounting T8078C

T8078C can mounted directly on the wall or on a suitable

unction box of dimension 65 x 65mm maximum. Mounting screws are supplied (2 x 25mm No. 6 woodscrews, 2 x 25mm M3.5 screws) and there are 4 mounting hole locations on the controller that can be used.

IMPORTANT !

The Installer must be a trained service engineer. Isolate the power supply before commencing installation.

(3) Make the required wiring connections

(4) Re-attach the cover and tighten the locking screw to complete the installation.

Wiring

The standard wiring access is through a hole at the top and back of T8078B, but there are 4 wiring breakouts in the cover to allow surface wiring, if necessary. T8078C has 14 wiring terminals – all are suitable for the connection of up to 1.5mm Take care not to over-tighten the terminal screws during installation, as this can damage the joints. Refer to schematics.

Applications

2

stranded cable.

pages for details of all wiring

Mounting on Q6360A1025 Fan Speed Sub-base

Where 230Vac fan-speed switching is required, T8078C can be mounted on the Q6360A1025 switching sub-base, using the screws supplied with Q6360. All line voltage wiring connections should be made to the sub-base before the controller is installed or wired. Line voltage sub-base wiring and low voltage controller wiring should be clearly separated and must comply with all relevant local electrical codes.

Layout & Wiring Connections

(1) Unscrew the cover locking screw and remove the cover.

(2) Mount T8078C to the surface using the mounting screws provided. If it is to be mounted onto a terminal unit, the installer should use appropriate bolts or self-tapping screws.

Terminals

1. 24 volt supply

2. 24 volt supply (0v)

3. Valve 1 open

4. Valve 1 close

5. Valve common

6. Valve 2 open / stage 1 on/off control (applications 3,4,9,10,15,16)

7. Valve 2 close / stage 2 on/off control (applications 3,4,9,10,15,16)

8. Heat / Cool changeover input

9. Heat / Cool changeover input

10. Energy savings input

11. Energy savings input

12. Remote sensor input

13. Remote common (for remote sensor / setpoint inputs)

14. Remote setpoint input

9 EN0R8535 R1 2003

APPLICATIONS – MODULATING CONTROL

(1) MODULATING COOLING

Valve position

100%

0%

X

pC

Setpoint

(oC)

Applications

•2-pipefcuvalvecontrol

• terminal unit damper control

• 2-pipe fcu airside control

• 4-pipe fcu airside control

Notes

1) Proportional Band XpC=2K or 4K.

2) Use 4K Prop Band for 4-pipe airside control, and wire damper motor as for actuator shown.

Wiring Schematics 2-port valves

T8078C

14

14 13

13 12

12 11

11 10

10

9

8

8 7

7 6

COOL

COM

6 5

5

4

-

+

3

3 2

2 1

1

M7410C

BROWN

3-port valves

T8078C

14

14 13

13 12

12 11

11 10

10

9

8

8 7

7 6

COOL

COM

6 5

5

4

-

+

3

3 2

2 1

1

M7410C

BROWN

WHITE

GREEN

WHITE

GREEN

T8109C SENS OR (OPTIONAL)

V5822A

V5822A V5832A

V5832A

M

24Vac

24Vac24Vac

~

T8109C SENS OR (OPTIONAL)

V5823A,C

V5823A,C V5833A,C

V5833A,C

M

24Vac

24Vac24Vac

~

(2) MODULATING HEATING

Valve position

100%

0%

X

pH

Setpoint

(oC)

Applications

•2-pipefcuvalvecontrol

• terminal unit damper control

• 2-pipe fcu airside control

• 4-pipe fcu airside control

Notes

1) Proportional Band XpH=2K or 4K.

2) Use 4K Prop Band for 4-pipe airside control, and wire damper motor as for actuator shown.

Wiring Schematics 2-port valves

T8078C

14

14 13

13 12

12 11

11 10

10

9

9 8

8 7

7 6

6

COM

5

5 4

4

-

HEAT

-

+

3

2

1

BROWN

GREEN

3-port valves

T8078C

14

14 13

13 12

12 11

11 10

10

9

9 8

8 7

7 6

6

COM

5

5 4

4

-

HEAT

-

+

3

2

1

GREEN

BROWN

M7410C

WHITE

M7410C

WHITE

T8109C SENSOR (OPTIONAL)

V5822A

V5822A V5832A

V5832A

M

24Vac

24Vac24Vac

~

T8109C SENSOR (OPTIONAL)

V5823A,C

V5823A,C V5833A,C

V5833A,C

M

24Vac

24Vac24Vac

~

10 EN0R8535 R1 2003

APPLICATIONS – MODULATING CONTROL

(3) MODULATING COOLING + 2-STAGE ON/OFF HEATING Wiring Schematics

Valve position

H

100%

0%

2

ID

H

1

ZEB

X

pC

Setpoint

(oC)

Applications

• 2-pipe fcu valve control with 1or 2 stage electric heat

• 2-pipe fcu airside control with 1or 2 stage electric heat

Notes

1) Proportional Band XpC=2K or 4K.

2) Zero Energy Band ZEB=2K or 4K.

3) Valve must be closed before heating comes on.

4) Heating stages H

5) H

1&H2

=1K (fixed).

are P+I on/off control with 1K prop. Band.

1&H2

6) Heating stages cycle rate=12c/hour (fixed).

7) Interstage Differential ID

8) Stages H

do not switch together -20s delay.

1&H2

=1K (fixed).

H

9) For airside control, wire damper motor as for actuator shown.

2-port valves

T8078C

14

14 13

13 12

12

11

10

9

9 8

8

H

7

2

HEAT

H

1

6

COM

5

5 4

4

-

COOL

3

+

2

2 1

1

3-port valves

T8078C

14

14 13

13

12

11

10

9

9 8

8

H

7

2

HEAT

H

1

6

COM

5

5 4

4

-

COOL

3

+

2

2 1

1

ELECTRIC HEAT (STAGE H

ELECTRIC HEAT (STAGE H1)

M7410C

WHITE

BROWN

M

GREEN

ELECTRIC HEAT (STAGE H

ELECTRIC HEAT (STA GE H1)

M7410C

WHITE

GREEN

M

BROWN

T8109C SENSOR (OPTIONAL)

)

2

V5822A

V5822A V5832A

V5832A

24Vac

~

T8109C SENSOR (OPTIONAL)

)

2

V5823A,C

V5823A,C V5833A,C

V5833A,C

24Vac

~

(4) MODULATING HEATING + 2-STAGE ON/OFF COOLING

Valve position

100%

0%

X

pH

Setpoint

ZEB

C

2

ID

C

1

(oC)

Applications

• 2-pipe fcu valve control with 1 or 2 stage chiller

• 2-pipe fcu airside control with 1 or 2 stage chiller

Notes

1) Proportional Band XpH=2K or 4K.

2) Zero Energy Band ZEB=2K or 4K.

3) Valve must be closed before cooling comes on.

4) Cooling stages C

5) C

1&C2

=1K (fixed).

are P+I on/off control with 1K prop. Band.

1&C2

6) Cooling stages cycle rate=6c/hour (fixed).

7) Interstage Differential ID

8) Stages C

do not switch together -20s delay.

1&C2

=1K (fixed).

C

9) For airside control, wire damper motor as for actuator shown.

Wiring Schematics 2-port valves

T8078C

14

14 13

13 12

12

11

10

9

9 8

8

C

7

2

COOL

C

1

6

COM

5

5 4

4

-

HEAT

-

+

3

3 2

2 1

1

BROWN

GREEN

3-port valves

T8078C

14

14 13

13

12

11

10

9

9 8

8

C

7

2

COOL

C

1

6

COM

5

5 4

4

-

HEAT

+

3

3 2

2 1

1

BROWN

M7410C

WHITE

M7410C

WHITE

GREEN

T8109C SENSOR (OPTIONAL)

COOLING (STAGE C

COOLING (STAGE C1)

V5822A

V5822A V5832A

V5832A

M

~

T8109C SENSOR (OPTIONAL)

COOLING (STAGE C

COOLING (STAGE C1)

V5823A,C

V5823A,C V5833A,C

V5833A,C

M

~

24Vac

2

)

2

11 EN0R8535 R1 2003

APPLICATIONS – MODULATING CONTROL

(5) MODULATING HEAT / COOL CHANGEOVER Wiring Schematics

Valve position

100%

0%

Heating

Mode

X

pCH

Setpoint

Cooling

Mode

(oC)

Applications

• 2-pipe fcu valve control with input signal for automatic changeover

Notes

1) Proportional Band X

=2K or 4K.

pCH

2) Wire as for Cooling control.

3) External input signal changes operating mode from cooling to heating.

4) Contact closure signal from single aquastat.

5) Contact closure signal from central control switch – ensure correct polarity of connection to all T8078C units.

2-port valves

T8078C

14

14 13

13 12

12

11

10

9

9 8

8 7

7 6

6

COM

5

5 4

4

-

COOL

3

+

2

2 1

1

3-port valves

T8078C

14

14 13

13 12

12

11

10

9

9 8

8 7

7 6

6

COM

5

5 4

4

-

COOL

3

+

2

2 1

1

M7410C

WHITE

BROWN

GREEN

M7410C

WHITE

GREEN

BROWN

T8109C SENSOR (OPTIONAL)

S4390A

S4390A HEAT / COOL

HEAT / COOL

CHANGEOVER SWITCH

V5822A

V5822A V5832A

V5832A

M

24Vac

24Vac24Vac

T8109C SENSOR (OPTIONAL)

S4390A

S4390A HEAT / COOL

HEAT / COOL

CHANGEOVER SWITCH

V5823A,C

V5823A,C V5833A,C

V5833A,C

M

24Vac

24Vac24Vac

(6) MODULATING COOLING + HEATING SEQUENCE

Valve position

100%

0%

X

pH

ZEB

Setpoint

X

pC

(oC)

Applications

•4-pipefcuvalvecontrol

Notes

1) Both Proportional Bands XpC&XpH=1K or 2K.

2) Zero Energy Band ZEB=2K or 4K.

3) Heat valve is closed before cooling valve opens.

4) Cool valve is closed before heating valve opens.

Wiring Schematics 2-port valves

T8078C

14

14 13

13 12

12

11

10

9

9 8

HEAT

COOL

COM

8 7

7

-

+

6

6 5

5 4

4

-

3

+

2

1

BROWN

3-port valves

T8078C

14

14 13

13 12

12

11

10

9

9 8

8 7

7

-

HEAT

COOL

COM

+

6

6 5

5 4

4

-

3

+

2

1

BROWN

M7410C

GREEN

WHITE

GREEN

M7410C

GREEN

WHITE

GREEN

T8109C SENS OR (OPTIONAL)

V5822A

V5822A V5832A

V5832A

M

24Vac

24Vac24Vac

~

T8109C SENS OR (OPTIONAL)

V5823A,C

V5823A,C V5833A,C

V5833A,C

M

24Vac

~

12 EN0R8535 R1 2003

APPLICATIONS – ON / OFF CONTROL

(7) ON/OFF COOLING Wiring Schematics

Valve position

100%

0%

X

pC

Setpoint

(oC)

Applications

•2-pipefcuvalvecontrol

Notes

1) Control is P+I on/off.

2) Cycle rate is 6c/hour (fixed).

3) Proportional Band X

=2K or 4K.

pC

4) Can use valves that require only to be driven in one direction (for example, with thermal actuators) or valves that require to be driven open, then driven closed.

5) Normally closed valves: use output from (+) terminal to drive open.

6) Normally open valves: use output from (-) terminal to drive closed.

Drive open valves

T8078C

14

14 13

13 12

12

11

10

9

9 8

8 7

7 6

6

COM

5

5 4

4

-

COOL

+

3

3 2

2 1

1

Drive open / drive closed valves

T8078C

14

14 13

13

12

11

10

9

9 8

8 7

7 6

6

COM

5

5 4

4

-

COOL

+

3

3 2

2 1

1

ACTUATOR

ACTUATOR COMMON

COMMON

OPEN VALVE

ACTUATOR

COMMON

CLOSE

OPEN

T8109C SENSOR (OPTIONAL)

24Vac

24Vac24Vac

~

T8109C SENS OR (OPTIONAL)

24Vac

24Vac24Vac

~

(8) ON/OFF HEATING

Valve position

100%

0%

X

pH

Setpoint

(oC)

Applications

•2-pipefcuvalvecontrol

Notes

1) Control is P+I on/off.

2) Cycle rate is 6c/hour (fixed).

3) Proportional Band X

=2K or 4K.

pH

4) Can use valves that require only to be driven in one direction (for example, with thermal actuators) or valves that require to be driven open, then driven closed.

5) Normally closed valves: use output from (+) terminal to drive open.

6) Normally open valves: use output from (-) terminal to drive closed.

Wiring Schematics Drive open valves

T8078C

14

14 13

HEAT

COM

13

12

11

10

9

9 8

8 7

7 6

6 5

5 4

4

-

+

3

3 2

2 1

1

ACTUATOR

COMMON

T8109C SENSOR (OPTIONAL)

OPEN

~

24Vac

24Vac24Vac

Drive open / drive closed valves

T8078C

14

14 13

HEAT

COM

13 12

12

11

10

9

9 8

8 7

7 6

6 5

5 4

4

-

+

3

3 2

2 1

1

ACTUATOR

COMMON

CLOSE

T8109C SENSOR (OPTIONAL)

OPEN

~

24Vac

24Vac24Vac

13 EN0R8535 R1 2003

APPLICATIONS – ON / OFF CONTROL

(9) ON/OFF COOLING + 2-STAGE ON/OFF HEATING Wiring Schematics

Valve position

H

100%

0%

2

ID

H

1

ZEB

X

pC

Setpoint

(oC)

Applications

• 2-pipe fcu valve control with 1or 2 stage electric heat

Notes

1) Cooling control is P+I form, with 6c/hour cycle rate.

2) Cooling Proportional Band X

=2K or 4K.

pC

3) Zero Energy Band ZEB=2K or 4K.

4) Cooling valve must be closed before heating comes on.

5) Heating stages H

6) H

1&H2

=1K (fixed).

are P+I on/off control with 1K Prop. Band.

1&H2

7) Heating stages cycle rate=12c/hour (fixed).

8) Interstage Differential ID

9) Stages H

do not switch together -20s delay.

1&H2

=1K (fixed).

H

Drive open valves

T8078C

14

14 13

13 12

12

11

10

9

8

H

7

2

HEAT

H

1

6

COM

5

4

-

COOL

3

+

2

2 1

1

Drive open / drive closed valves

T8078C

14

14 13

13

12

11

10

9

9 8

8

H

7

2

HEAT

H

1

6

COM

5

5 4

4

-

COOL

3

+

2

1

T8109C SENSOR (OPTIONAL)

ELECTRIC HEAT (STAGE H

ELECTRIC HEAT (STAGE H1)

ACTUATOR

COMMON

OPEN VALVE

~

T8109C SENSOR (OPTIONAL)

ELECTRIC HEAT (STAGE H

ELECTRIC HEAT (STAGE H1)

COMMON

CLOSEVALVE

OPEN VALVE

ACTUATOR

~

24Vac

)

2

)

2

(10) ON/OFF HEATING + 2-STAGE ON/OFF COOLING

Valve position

100%

0%

X

pH

Setpoint

ZEB

C

2

ID

C

1

(oC)

Applications

• 2-pipe fcu valve control with 1 or 2 stage chiller

Notes

1) Heating control is P+I form, with 6c/hour cycle rate.

2) Heating Proportional Band X

=2K or 4K.

pH

3) Zero Energy Band ZEB=2K or 4K.

4) Heating valve must be closed before cooling comes on.

5) Cooling stages C

6) C

1&C2

=1K (fixed).

are P+I on/off control with 1K Prop. Band.

1&C2

7) Cooling stages cycle rate=6c/hour (fixed).

8) Interstage Differential ID

9) Stages C

do not switch together -20s delay.

1&C2

=1K (fixed).

C

Wiring Schematics Drive open valves

T8078C

14

14 13

COOL

HEAT

COM

13 12

12

11

10

9

8

C

7

2

C

1

6

6 5

5

4

-

+

3

3 2

2 1

1

COMMON

OPEN VALVE

T8109C SENSOR (OPTIONAL)

COOLING (STAGE C

COOLING (STAGE C1)

ACTUATOR

~

24Vac

Drive open / drive closed valves

T8078C

14

14 13

COOL

HEAT

COM

13

12

11

10

9

9 8

8

H

7

2

H

1

6

6 5

5 4

4

-

3

+

2

1

CLOSEVALVE

OPEN VALVE

T8109C SENSOR (OPTIONAL)

COOLING (STAGE H

COOLING (STAGE H1)

COMMON

ACTUATOR

~

24Vac

)

2

)

2

14 EN0R8535 R1 2003

APPLICATIONS – ON / OFF CONTROL

(11) ON/OFF HEAT / COOL CHANGEOVER Wiring Schematics

Valve position

100%

0%

Heating

Mode

X

pCH

Setpoint

Cooling

Mode

(oC)

Applications

• 2-pipe fcu valve control with input signal for automatic changeover

Notes

1) Control is P+I form, with 6c/hour cycle rate (heating or cooling).

2) Proportional Band X

=2K or 4K.

pCH

3) Wire as for Cooling control.

4) External input signal changes operating mode from cooling to heating.

5) Contact closure signal from single aquastat.

6) Contact closure signal from central control switch – ensure correct polarity of connection to all T8078C units.

Drive open valves

T8078C

14

14 13

13 12

12 11

11 10

10

9

9 8

8 7

7 6

6

COM

5

5 4

4

-

COOL

3

+

2

1

Drive open / drive closed valves

T8078C

14

14 13

13 12

12 11

11 10

10

9

9 8

8 7

7 6

6

COM

5

5 4

4

-

COOL

3

+

2

1

ACTUATOR

COMMON

OPEN VALVE

ACTUATOR

COMMON

CLOSEVALVE

OPEN VALVE

T8109C SENSOR (OPTIONAL)

S4390A

S4390A HEAT / COOL

HEAT / COOL

CHANGEOVER SWITCH

24Vac

24Vac24Vac

~

T8109C SENSOR (OPTIONAL)

S4390A

S4390A HEAT / COOL

HEAT / COOL

CHANGEOVER SWITCH

24Vac

24Vac24Vac

~

(12) ON/OFF COOLING + HEATING SEQUENCE

Valve position

100%

0%

X

pH

ZEB

Setpoint

X

pC

(oC)

Applications

•4-pipefcuvalvecontrol

Notes

1) Both stages are P+I on/off control, with 6c/hour cycle rate.

2) Both Proportional Bands X

pC&XpH

=1K or 2K.

3) Zero Energy Band ZEB=2K or 4K.

4) Heat valve is closed before cooling valve opens.

5) Cool valve is closed before heating valve opens.

Wiring Schematics Drive open valves

T8078C

14

14 13

HEAT

COOL

COM

13

12

11

10

9

9 8

8 7

7

-

+

6

6 5

5 4

4

-

3

+

2

2 1

1

OPEN VALVE

COMMON

OPEN VALVE

T8109C SENSOR (OPTIONAL)

HEAT

ACTUATOR

COOL

COOL ACTUATOR

ACTUATOR

24Vac

24Vac24Vac

~

Drive open / drive closed valves

T8078C

14

14 13

HEAT

COOL

COM

13 12

12 11

11 10

10

9

9 8

8 7

7

-

+

6

6 5

5 4

4

-

3

+

2

1

CLOSE VALVE

OPEN VALVE

COMMON

CLOSEVALVE

OPEN VALVE

T8109C SENSOR (OPTIONAL)

HEAT

ACTUATOR

COOL

COOL ACTUATOR

ACTUATOR

24Vac

24Vac24Vac

~

15 EN0R8535 R1 2003

APPLICATIONS – TPM CONTROL (THERMO-ELECTRIC ACTUATORS)

13) TPM COOLING Wiring Schematic

Valve position

100%

0%

X

pC

Setpoint

(oC)

Applications

• 2-pipe fcu valve control (with thermal actuator)

Notes

1) Special algorithm for thermal actuators.

2) Proportional Band X

=2K or 4K.

pC

3) Only suitable for normally closed valves: where actuator is

powered to drive valve open.

For normally closed valve – drive to open

T8078C

14

14 13

COOL

COM

13 12

12 11

11 10

10

9

9 8

8 7

7 6

6 5

5 4

4

-

+

3

2

1

ACTUATOR

ACTUATOR COMMON

COMMON

OPEN VALVE

T8109C SENSOR (OPTIONAL)

~

24Vac

24Vac24Vac

(14) TPM HEATING

Valve position

100%

0%

X

pH

Setpoint

(oC)

Applications

• 2-pipe fcu valve control (with thermal actuator)

Notes

1) Special algorithm for thermal actuators.

2) Proportional Band X

=2K or 4K.

pH

3) Only suitable for normally closed valves: where actuator is

powered to drive valve open.

Wiring Schematic For normally closed valve – drive to open

T8078C

14

14 13

HEAT

COM

13 12

12 11

11 10

10

9

9 8

8 7

7 6

6 5

5 4

4

-

+

3

3 2

2

1

ACTUATOR

COMMON

T8109C SENSOR (OPTIONAL)

OPEN

~

24Vac

24Vac24Vac

16 EN0R8535 R1 2003

APPLICATIONS – TPM CONTROL (THERMO-ELECTRIC ACTUATORS)

(15) TPM COOLING + 2-STAGE ON/OFF HEATING Wiring Schematic

Valve position

H

100%

0%

2

ID

H

1

ZEB

X

pC

Setpoint

(oC)

Applications

• 2-pipe fcu valve control with 1or 2 stage electric heat

Notes

1) Cooling control is special algorithm for thermal actuators.

2) Only suitable for normally closed valves: where actuator is

powered to drive valve open.

3) Cooling Proportional Band X

=2K or 4K.

pC

4) Zero Energy Band ZEB=2K or 4K.

5) Heating stages H

6) H

1&H2

=1K (fixed).

are P+I on/off control with 1K Prop. Band.

1&H2

7) Heating stages cycle rate=12c/hour (fixed).

8) Interstage Differential ID

9) Stages H

do not switch together -20s delay.

1&H2

=1K (fixed).

H

For normally closed valve – drive to open

T8078C

14

14 13

13 12

12

11

10

HEAT

COOL

COM

10

9

8

H

7

2

H

1

6

6 5

5

4

-

3

+

2

2 1

1

ELECTRIC HEAT (STAGE H

ELECTRIC HEAT (STAGE H1)

ACTUATOR

COMMON

OPEN VALVE

T8109C SENSOR (OPTIONAL)

)

2

24Vac

~

(16) TPM HEATING + 2-STAGE ON/OFF COOLING

Valve position

100%

0%

X

pH

Setpoint

ZEB

C

2

ID

C

1

(oC)

Applications

• 2-pipe fcu valve control with 1 or 2 stage chiller

Notes

1) Heating control is special algorithm for thermal actuators.

2) Only suitable for normally closed valves: where actuator is

powered to drive valve open.

3) Heating Proportional Band X

=2K or 4K.

pH

4) Zero Energy Band ZEB=2K or 4K.

5) Cooling stages C

6) C

1&C2

=1K (fixed).

are P+I on/off control with 1K Prop. Band.

1&C2

7) Cooling stages cycle rate=6c/hour (fixed).

8) Interstage Differential ID

9) Stages C

do not switch together -20s delay

1&C2

=1K (fixed).

C

Wiring Schematic For normally closed valve – drive to open

T8078C

14

14 13

COOL

HEAT

COM

13 12

12

11

10

9

8

C

7

2

C

1

6

6 5

5

4

-

+

3

3 2

2 1

1

COMMON

OPEN VALVE

T8109C SENSOR (OPTIONAL)

COOLING (STAGE C

COOLING (STAGE C1)

ACTUATOR

~

24Vac

)

2

17 EN0R8535 R1 2003

APPLICATIONS – TPM CONTROL (THERMO-ELECTRIC ACTUATORS)

(17) TPM HEAT / COOL CHANGEOVER Wiring Schematic

Valve position

100%

0%

Heating

Mode

X

pCH

Setpoint

Cooling

Mode

(oC)

Applications

• 2-pipe fcu valve control with input signal for automatic changeover

Notes

1) Control is special algorithm for thermal actuators.

2) Only suitable for normally closed valves: where actuator is powered to

drive valve open.

3) Proportional Band X

=2K or 4K.

pCH

4) Wire as for Cooling control.

5) External input signal changes operating mode from cooling to heating.

6) Contact closure signal from single aquastat.

7) Contact closure signal from central control switch – ensure correct polarity of connection to all T8078C units.

For normally closed valve – drive to open

T8078C

14

14 13

COOL

COM

13 12

12 11

11 10

10

9

9 8

8 7

7 6

6 5

5 4

4

-

3

+

2

1

COMMON

OPEN VALVE

T8109C SENSOR (OPTIONAL)

ACTUATOR

S4390A

S4390A HEAT / COOL

HEAT / COOL

CHANGEOVER SWITCH

24Vac

24Vac24Vac

~

(18) TPM COOLING + HEATING SEQUENCE

Valve position

100%

0%

X

pH

ZEB

Setpoint

X

pC

(oC)

Applications

•4-pipefcuvalvecontrol

Notes

1) Control is special algorithm for thermal actuators.

2) Only suitable for normally closed valves: where actuator is

powered to drive valve open.

3) Both Proportional Bands X

pC&XpH

=1K or 2K.

4) Zero Energy Band ZEB=2K or 4K.

Wiring Schematic For normally closed valves – drive to open

T8078C

14

14 13

HEAT

COOL

COM

13 12

12

11

10

9

9 8

8 7

7

-

+

6

6 5

5 4

4

-

3

+

2

2 1

1

OPEN VALVE

COMMON

OPEN VALVE

T8109C SENSOR (OPTIONAL)

HEAT

ACTUATOR

COOL

COOL ACTUATOR

ACTUATOR

24Vac

24Vac24Vac

~

18 EN0R8535 R1 2003

ADDITIONAL FEATURES

Automatic Heat / Cool Changeover

T8078C is suitable for automatic or central Heat / Cool Changeover, if configured for this Mode of operation. This is applicable only for 2-pipe fan-coil systems, where the changeover is made on a seasonal demand basis. Configuration is done by setting System switches S3 and S4 to 1 and 0 respectively. Automatic changeover is initiated by a thermostat positioned on the water flow pipe, detecting the presence of heated or chilled water, and sending the appropriate signal to the controller. A suitable product is the S4390A1004 pipethermostat. Central changeover is initiated by a switch, and can be used to centrally switch a group of connected T8078C controllers from Heating to Cooling operation. See wiring schematics for connection details.

Remote Temperature Sensor

T8078C is supplied with an on-board temperature sensor. If remote temperature sensing is required (for example in return air sensing applications), then a suitable Honeywell Remote Sensor can be connected to terminals 12 and 13 as shown in the wiring schematic. T8078C will auto detect the presence of the Remote Sensor on power up, and will use the Remote Sensor measurement in preference to its internal sensor. So if a Remote Sensor is to be connected, the power must be switched off then on again for it to be detected. Remote Sensors are available as wall-mounted or airflow (return air) models. Both Q979A1020 and Q979C1036 contain the sensor in wall-mounted form, whereas T8109C1002 is an airflow sensor supplied with 1.5 m cable. If this cable is to be extended then the maximum cable run will be 20m, and the extension must use screened cable. Polarity of connection is not important, but the screen wire must be connected to terminal 9 or 10, as shown.

T8109C1002 Sensor

Note : x 50 units maximum Take care to always observe polarity of connection

Q979A1020 Wall-mounted Sensor

19 EN0R8535 R1 2003

Remote Setpoint Adjustment

y

Suitable Valves & Actuators

T8078C allows its setpoint to be adjusted remotely by up to ±5K. This is achieved by the connection of a Remote Setpoint Adjustment module to terminals 13 and 14, as shown in the wiring schematic.

Suitable modules are : Q979B1029 (Remote Setpoint Adjust) and Q979C1036 (Sensor + Remote Setpoint Adjust).

Note – the polarit is purely resistive.

To ensure measurement stability when wiring these modules, use screened cable and connect the screen wire to terminal 9 or 10 of T8078C as shown. The maximum cable run will be 20m.

of connection is not important as the input

T8078C is compatible with a range of Honeywell valves and actuators, as shown in the table below. See relevant product Specificaton Sheets for more details.

Valve Actuators Suitable Valves

Conical Sealing

M6410C M7410C

Modulating 3-pos, 24V~

Max of 10 actuators (0.7VA each) to be connected to any T8078C output

M8450A1000

Thermo-electric, 24V~ Stroke 8mm

Max of 2 actuators (3VA each) to be connected to any T8078C output

M100

Thermo-electric, 24V~ Stroke 2.5mm

Z100

Thermo-electric, 24V~ Stroke 4mm

Max of 2 actuators (3VA each) to be connected to any T8078C output

V5822A 2-way V5823A 3-way V5823C 3-way+bypass

Flat Sealing

V5832A 2-way V5833A 3-way V5833C 3-way+bypass

Conical Sealing

V5822A 2-way V5823A 3-way V5823C 3-way+bypass

Flat Sealing

V5832A 2-way V5833A 3-way V5833C 3-way+bypass

Conical Sealing

V5822A4xxx 2-way V5823A4xxx 3-way V5823C4xxx 3-way+bypass

Flat Sealing

V5832A4xxx 2-way V5833A4xxx 3-way V5833C4xxx 3-way+bypass

Damper Actuators

Modulating 3-pos, 24V~ 4Nm

ML6161B2024

5Nm

ML6161E

10Nm

ML6174E

20Nm

N2024

34Nm

N3424

Max no. to be connected to each T8078C output

Max of 3 actuators (2VA each)

Max of 2 actuators (4VA each)

Max of 1 actuator (6VA each)

Max of 1 actuator (7VA each)

Optional Accessories

Optional accessories are available for use with T8078C:

F42006646-001 Range stops (pack of 20) F42007789-001 Wall-plate

Q6360A1025 Fan Speed Switching Subbase Q979A1020 Wall mounted Remote Sensor Q979B1029 Remote Setpoint Adjust Unit (±5K) Q979C1036 Sensor + Remote Setpoint Unit (±5K)

T8109C1002 Return Air Sensor (1.5m cable) S4390A1004 Pipe-mounted Changeover Thermostat

Honeywell Control Systems Limited Newhouse Industrial Estate Motherwell ML1 5SB United Kingdom

Honeywell

http://europe.hbc.honeywell.com

20 EN0R8535 R1 2003

Honeywell T8078C User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual