Honeywell T2798I2000 User manual

Page 1 of 18 APHITEMPCON001-11-04

APPLICATION:

This standalone micro-controller based LCD temperature

controller provides proportional plus integral (P+I) and on/off

temperature control for commercial Heating, Ventilating & Air

Conditioning System such as Hydronic Heating, Air Handling

Unit, Heat Exchanger or Condensing Tower.

This controller has a modulating analog 2 to 10Vdc or 4 to

20mA output and a 2A on/off output to realize various optional

control functions including cool/heat changeover, heat/cool

sequence control, emergency interlocking and auto-alarming

control.

Table of Contents

Application………………………………………….1

Features…………………………………………….1

Specification………………………………………..2

Dimensions, Installation & Wiring Terminals..….3

Control Operation………………………………….4

Installer SetUp……………………………………..12

FEATURES:

•PI (proportional plus integral) control action

provides accurate, stable and comfortable

temperature control.

•Compatible with series 70 direct-coupled

damper / valve actuator like ML7161,

ML7174, ML7420 / ML7421series ML7425,

ML7984 series, N20010, S10010, M7410E

series, CN7505, CN7510 / CN72 series

CN7220 & CN7234 also VC79 series etc.

•Backlit LCD to display both setting and

measured value.

•Adjustable Zero Energy Band, On/Off

Differential, Proportional Band and

Temperature Offset.

•Analog output can be forced manually to be

convenient for installation & commissioning.

•Optional 2 to 10Vdc or 4 to 20mA direct

acting and reverse acting analog output.

•Selectable internal and external temperature

sensor.

•Wide temperature control range (-20 to 110

°C by using external temperature sensor) is

suitable for extreme temperature control such

as steam and ice water.

•Watch Dog Timer: to resume the controller

from hanging condition.

•Brownout effect to avoid malfunctioning and

care on power ON and power OFF.

•Pluggable terminal block allows pre-wiring

outside of the controller.

•Compact size and slim design provide

elegant and attractive modern style

appearance.

Page 2 of 18 APHITEMPCON001-11-04

SPECIFICATIONS:

IMPORTANT: The specifications given in this publication

do not include normal manufacturing tolerances.

Therefore, this unit may not exactly match the listed

specifications. Also, this product is tested and calibrated

under closely controlled conditions and some minor

difference in performance can be expected if those

conditions are changed.

MODEL: T2798I2000

Control Performance: This controller provides 4 to 20mA

or 2 to 10Vdc Proportional plus Integral modulating control

and 4(2) A On/Off control.

INPUTS:

1) Analog - 1 No. (Only PT1000)

2) Digital - 1 No. (Dry Contact)

OUTPUTS:

1) Analog - 1 No.

2) Digital - 1 No.

SETPOINT RANGE:

5-50°C (internal temperature sensor)

-20-110°C (external temperature sensor)

POWER SUPPLY: AC24V ±20%, 50/60Hz,

2 VA.

ANALOG OUTPUT:

2 to 10Vdc OR

4 to 20mA.

DIGITAL OUTPUT:

2A, 24Vac

MOUNTING: Direct wall mounting

with standard electrical mounting box [type-3 module].

TERMINALS: Plug-in screw terminals

are suitable for 1.5 square mm wire.

OPERATING AMBIENT:

0-50°C, 5-80%RH.

Shipping & Storage:

-20 - 45°C, 5-95%RH

ACCURACY:

< / = +/- 0.30°C

REMOTE SENSOR: RTD

PT1000.

Maximum 15m cable length

(line resistance < 4.5Ω)

Enclosure: ABS Plastic, 2-piece. (IP30)

OPERATING PARAMETER:

See TABLE 2 for installer selections.

Parameter Selection

Zero Energy Band 1.5 or 3.0°C

On/Off Differential 0.5 to 3.0°C (0.5°C

step change)

Proportional Band 2.0 to 19.0°C (0.1°C

step change)

Offset -3.0 to 3.0°C (0.5°C

step change)

Set Point Definition Heating, Cooling,

H/C midpoint,

Heating/Alarming or

Cooling/Alarming.

Main Sensor Remote or Internal

ACCESSORIES:

Duct Mount Remote Sensor PT1000.

DIN Class B.

Model # RSPT1000

Probe Length: 300mm

(to be ordered separately)

Page 3 of 18 APHITEMPCON001-11-04

DIMENSIONS:

INSTALLATION:

The controller can be installed in any position on a

flat surface using electrical box [Type-3 Module].

To measure room temperature by internal sensor

and choosing wall mounting method, it is

recommended to be installed 1.5m (about 5 ft.)

above the floor in the area at average temperature

conditions.

For all kinds of mounting method, the product must

be installed in an area with good air circulation.

Do not install the controller where it may be

affected by:

Draughts or dead air spots behind doors

and in corners.

Hot or cold air from ducts.

Radiant heat from sun or appliances.

Concealed pipes and chimneys

WIRING TERMINAL:

1 & 2 – Relay Output

3 – 0Vac

4 – 24Vac

5 – Digital Input

6 – 2…10Vdc OR 4…20mA analog output

7 & 8 – PT1000 Remote Sensor

135

115

135

115

107.5

83.5

86.5

M3 Self Tapping screw

Page 4 of 18 APHITEMPCON001-11-04

CONTROL OPERATION:

Input1 –Remote Temperature Sensor

The controller has an integral sensing device mounted internally. It is also possible to install a

remote room or duct return sensor at different locations. See wiring diagram.

Note#1: The remote sensor should be PT1000 (Refer Accessories)

Input2- Emergency Input

Input2 is to connect with an On/Off dry contact for system error or emergency interlock control. If

the contact is close, the controller will automatically close all output (or open to the maximum

position in reverse mode) and cut off the power. The controller can only be restarted manually.

Note#2: If you don’t want to use the interlock function/emergency input please use a jumper wire

to connect input2 (terminal no.5) and neutral port (Terminal no.3), see wiring diagram.

Output1-Modulating Analog Output (2 to 10Vdc or 4 to 20mA)

Output1 is modulating P+I analog 2 to 10Vdc or 4 to 20mA. It can be selected by Selector

switch. The output signal is normal mode (2 to 10Vdc or 4 to 20mA) or reverse mode (10 to

2Vdc or 20 to 4mA) selectable.

Output2- On/Off digital Output (2A, 24Vac)

Output2 is digital output with 24VAC 2A Contact rating, nominal capacity. It provides On/Off

control for electric heater, on/off valve actuator or fan etc.

Output2 can provide limitation control through pre-setting a separate temperature limitation.

Page 5 of 18 APHITEMPCON001-11-04

Heat / Cool Changeover of Output1

Output1 is suitable for Heat/Cool changeover (manually) control in 2pipe AHU, Zoning control or

Hydronic Heating application. Wiring connection is shown in fig.

With cooling or heating selected, the user set point (SP) will be positioned at the middle of

proportional band. The output percentage is proportional to the temperature measured and

decided by proportional band. The proportional band can be set from 2.0°C to 19.0°C. The

control logic is seen in Diagram 1.

Diagram 1:

Wiring Diagram

A/OD/I

Pt1000

sensor

1 2 3 4 5 6 7

PT1000

REMOTE SENSOR

2-10VDC /

4-20mA

Actuator

Unit

POWER

SUPPLY

110VAC /

230VAC

0VAC

24VAC

4 - 20 m A

2 - 10 VDC

Note: If Emergency IP [D/I] not used then

Add link between terminal No 5 & 3.

Proportional band

Cooling

Heating

50%

Valve Open

100%

Temperature Increase

Valve Close

Page 6 of 18 APHITEMPCON001-11-04

Heating + Cooling Sequence control with Zero Energy Band

This kind of control requires Zero Energy Band (Z-Band). Z-Band is pre-set. For control purpose,

the zero energy band is centered on the user set point (SP), so its value defines the effective

heating (H SP) & cooling (C SP) set points. The cooling set point (C SP) will be positioned on

the right side of Z-Band & the heating set point (H SP) on the left side of Z-Band. Z-Band can be

set as 1.5°C or 3.0°C. Any change of set point will cause both heating and cooling set points to

change in parallel. Either output1 or output2 can be used for cooling or heating control. The

control logic is seen in Diagram 2 and 3.

Diagram 2: Heating + Cooling Sequence Control.

Band

Output 2

Cooling

50%

Valve Open

100%

Temperature Increase

Valve Close

Output 1

Heating

Diff

H SP

C SP

Page 7 of 18 APHITEMPCON001-11-04

Diagram 3: Cooling + Heating Sequence Control.

Diff

Band

Output 1

Cooling

50%

Valve Open

100%

Valve Close

Output 2

Heating

C SP

H SP

Page 8 of 18 APHITEMPCON001-11-04

Heating/Cooling + Temperature Limitation Control

Output2 can be used for temperature limitation control. To select this function, 2 temperature set

points must be pre-set. One is in the mid of proportional band of output1 (C SP / H SP) as main

setting temperature. The second one is the temperature limitation of heating or cooling (A SP).

In this mode if the measured temperature is higher (in heating mode) or lower (in cooling mode)

than temperature limitation, output2 will close and output an alarming signal. The control logic is

seen in Diagram 4 and 5.

Diagram 4: Cooling + Temperature Limit Control.

Output 1

Cooling

50%

Valve Open

100%

Temperature Increase

Valve Close

Output 2

Alarm

C SP

A SP

Page 9 of 18 APHITEMPCON001-11-04

Diagram 5: Heating + Temperature Limit Control.

Wiring Diagram

I] STANDARD WIRING DIAGRAM:

A/OD/I

Pt1000

sensor

1 2 3 4 5 6 7

PT1000

REMOTE SENSOR

ON / OFF

Valve /

Actuator

2-10VDC /

4-20mA

Actuator

Unit

POWER

SUPPLY

110VAC /

230VAC

0VAC

24VAC

4 - 20 mA

2 - 10 VDC

Note : If Emergency IP [D/I] not used then add link between terminal No 5 & 3.

Output 2

Alarm

50%

Valve O

pen

100%

Temperature Increase

Valve Close

Output 1

Heating

H SP

A SP

Page 10 of 18 APHITEMPCON001-11-04

II] T2798I2000 wiring with frequently used Actuators

WIRING DIAGRAM T2798I2000 WITH ML-7984

4 - 20 mA

2 - 10 VDC

NOTE:

DIRECT ACTING FUNCTION (ACTUATOR STEM MOVES

UPWARD WITH SIGNAL INCREASES) OR REVERSAL ACTING

FUNCTION (ACTUATOR STEM MOVES DOWNWARDS WITH

SIGNAL INCREASES)

NTC20K

REMOTE

SENSOR

230V AC, 50Hz

TRANSFORMER

24VAC

Pt1000

sensor

0VAC

24VAC

50 / 60 Hz

OVAC

110VAC

230VAC

0VAC

24VAC

TRANSFORMER

2-10V DC DIRECT ACTING

10-2V DC REVERSE ACTING

OFF

DIP SWITCH CONFIGURATION

FUNCTION

DIP SWITCH OF ML 7984A

Ml7984

4 - 20 mA

2 - 10 VDC

WIRING DIAGRAM T2798I2000 WITH ML-7421

A/O

D/I

Pt1000

sensor

0VAC

24VAC

50 / 60 Hz

OVAC

110VAC

230VAC

PT1000

REMOTE

SENSOR

0VAC

24VAC

TRANSFORMER

230VAC, 50Hz

TRANSFORMER

24VAC

ML-7421

0-10V / 0-20mA

2-10V / 4-20mA

10V / 20mA

100 50 0

0 0 0

ML-7421

1 2 3 4 5 6 7 8

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