Johnson Controls C450CCN-2, System 450 Series, C450CBN-2 Installation Instructions Manual

Figure 1: System 450 Module

Dimensions, mm (in.)

127

(5)

4

Screw

Slots

11

(7/16)

(2-3/8)

75

(2-15/16)

1/2 in. Nominal

Trad e Size

Conduit Hole

22

(7/8)

40

(1-9/16)

DIN Rail

Clips

FIG:sys450_dims

System 450™ Series Control Modules with Relay Outputs

Installation Instructions

C450CBN-2
C450CCN-2

Part No. 24-7664-2845, Rev. B

Issued January 23, 2012

Supersedes December 15, 2011

Application

IMPORTANT: Use this System 450 Series Control

Module with Relay Output only as an operating
control. Where failure or malfunction of the System
450 control module could lead to personal injury or
property damage to the controlled equipment or
other property, additional precautions must be
designed into the control system. Incorporate and
maintain other devices, such as supervisory or
alarm systems or safety or limit controls, intended to
warn of or protect against failure or malfunction of
the System 450 control module.

System 450™ is a family of modular, digital electronic
controls that is easily assembled and set up to provide
reliable temperature, pressure, and humidity control for
a wide variety of Heating, Ventilating, Air Conditioning,
and Refrigeration (HVACR) and commercial/industrial
process applications.

The System 450 control modules allow you to
configure custom application-specific control systems
with up to three input sensors and ten (relay and/or
analog) outputs, including control systems that can
monitor and control temperature, pressure, and
humidity applications simultaneously.

Beginning with firmware Version 2.00, standard
System 450 control modules include the High
Input-Signal Selection and Differential Control fe atures.

See High Input-Signal Selection

Differential Control

on page 16 for more information.

on page 9 and

Installation

13

(1/2)

(3/16)

(Four)

61

61

(2-3/8)

You can easily install and quickly configure a
stand-alone System 450 control module and sensor in
the field as a replacement control for almost any
temperature, pressure, and humidity control.

C450CxN-2 models are Single-Pole, Double-Throw
(SPDT) relay control modules with Liquid Crystal
Display (LCD) and four-button touch pad User Interface
(UI) that allows you to set up a System 450 control
system. C450CBN-2 models provide one SPDT relay.
C450CCN-2 models provide two SPDT relays.

Refer to the System 450 Series Technical Bulletin
(LIT-12011459) for more detailed information on
designing, installing, setting up, and troubleshooting
System 450 Series control systems. The System 450
technical bulletin can be accessed and downloaded on
the Johnson Controls® Online Product Litera tu re Web
site at the following Web address:

http://cgproducts.johnsoncontrols.com/default.aspx

Location Considerations

Observe the following System 450 location guidelines:

• Ensure that the mounting surface can support the
module assembly, mounting hardware, and an
(

user-supplied) panel or enclosure.

• Mount the modules upright and plugged together
a h

orizontal row where po ssible (Figure 3). DI

m

ounting is highly recommended.

• Mount modules on flat even surf
Allow sufficient space for wires and connections.

•

• Mount the modules in locations free of corr
vapors and observe the ambient operating
conditions listed in the Technical Specifications

System 450™ Series Control Modules with Relay Outputs Installation Instructions 1

aces.

y

in

N rail

osive

.

• Do not mount the modules on surfaces that are

!

prone to vibration or in locations where radio
frequency or electromagnetic emissions may
cause interference.

Note: If you mount the modules on an uneven
surface, do not damage the housings when
tightening mounting screws. Use shims/washers to
mount module assembly evenly on the surface.

• Do not install the modules in airtight enclosures.

• Do not install heat-generating devices in an
enclosure with the modules that may cause the
temperature to exceed the ambient operating limit.

Mounting

Mount System 450 modules on 35 mm DIN rail
(recommended) or directly to an even wall surface. To
mount modules on DIN rail:

1. Provide a section of 35 mm DIN rail that is longer
than the module assembly width, and mount the
DIN rail horizontally in a suitable location using
appropriate mounting hardware/fasteners.

2. Clip the control module on the rail, position the
upper DIN rail clips on the top rail, and gently snap
the lower clips onto the rail.

3. Clip the remaining power and/or expansion
modules to the right of the control module on to the
DIN rail and plug the 6-pin module connectors
together (Figure 3).

Note: If your System 450 control system uses a
power module, the power module must be plugged
into the right-hand side of the control module.

To direct-mount modules to wall surfaces:

Refer to the control sensor installation instructions for
information on locating and mounting control sensors.

Wiring

See Figure 2 and Table 1 for electrical termination
locations and wiring information. See Technical

Specifications on page 23 for electrical ratings.

WARNING: Risk of Electric Shock.

Disconnect or isolate all power supplies
before making electrical connections.
More than one disconnect or isolation
may be required to completely
de-energize equipment. Contact with
components carrying hazardous voltage
can cause electric shock and may result
in severe personal injury or death.

IMPORTANT: Use copper conductors only. Make
all wiring in accordance with local, national, and
regional regulations.

IMPORTANT: Do not exceed the System 450
module electrical ratings. Exceeding module
electrical ratings can result in permanent da mage to
the modules and void any warranty.

1. Plug the modules together, remove the module
covers, place the assembly against wall surface
horizontally in a suitable location and mark the
mount hole locations on the surface (Figure 1).

2. Install appropriate screw fasteners, leaving screw
heads approximately one to two turns away from
flush to the surface.

3. Place the assembly over screw heads on the
mounting slots, and carefully tighten the mounting
screws.

IMPORTANT: Do not connect 24 VAC supply
power to the System 450 modules before finishing
wiring and checking all wiring connections. Short
circuits or improperly connected wires can result in
damage to the modules and void any warranty.

IMPORTANT: Run all low-voltage wiring and
cables separate from all high-voltage wiring.
Shielded cable is strongly recommended for input
(sensor) and analog output cables that are exposed
to high electromagnetic or radio frequency noise.

System 450™ Series Control Modules with Relay Outputs Installation Instructions2

Figure 2: C450CxN-2 Wiring Terminals

C

5V

C

C

are connected

internally.

Internal

SPDT Relay

Normally Closed/Off

Position

LNC1

LNO1

LC1

Low Voltage (<30 V)

Dry-Contact, Line-Voltage

Relay Output Terminals

(See

for Electrical Ratings.)

Technical S pecificatio ns

Some models have

and termi nal block labeled

LNC2, LNO2, and LC 2.

FIG:sys450_rly_cntrl_wir

not

relay and do supply any power to the application.

Note:

The relay output terminals connect to an internal SPDT

Supply Power and

Control Sen sor Term inals

24V

Sn2

Sn3

Sn1

6-Pin

Module

Connector

a second output relay

Table 1: System 450 Terminal Wiring Information

Label Terminal Function Wire Sizes

24V Accepts 24 V AC supply power , when a C450YNN power module is not connected,

and provides power terminal for 24 VAC (humidity) sensors.

5V Provides 5 VDC power for active sensors.
Sn-1, Sn-2,

Sn-3

C

(Three
Terminals)

LNC1, LNC2 Connects control circuit to the Normally Closed (N.C.) contact on the SPDT relay.
LNO1, LNO2 Connects control circuit to the Normally Open (N.O.) contact on the SPDT relay.
LC1, LC2

Accepts passive or active (0–5 VDC) input signals from sensors.
Note: You must position the Active/Passive Sensor Jumper (Figure 3 and

Figure 6) correctly for each sensor in your control system before operating the
system. See Setting Active/Passive Sensor Jumpers for more information.

Provide low-voltage Common connections for 24 VAC power and passive or active
sensors connected to the 5V, Sn1, Sn2, and Sn3 terminals.

Note: The three C terminals are connected internally and can be connected to
ground in the field.

1

Connects line (power) to Common (C) on the SPDT

relay.

Common (C) terminals

0.08 mm
28 AWG to 16 AWG

0.08 mm
28 AWG to 14 AWG

2

to 1.5 mm

2

to 2.5 mm

2

2

1. See Internal SPDT Relay insert in Figure 2 for more System 450 relay contact and terminal information. See T echnical
Specifications for SPDT relay electrical ratings.

System 450™ Series Control Modules with Relay Outputs Installation Instructions 3

Figure 3: Example System 450 Heat/Cool System with Condenser Fan Speed Control

L2
L1

L2
L1

4-20 mA

Signal

L1 L2

Note:

Sn-1
Sn-2
Sn-3

Active/ P assive Sens or Jumpers

Figure 4: System 450 Control Module Output Relay LEDs,

LCD, Four-Button Touch Pad User Interface

Output Number:

with the stat us or setup va lue shown
on the scr een. Output nu m bers are
automati cally determi ned by the outp uts'
physical positions (left to right) in the
modul e as sembly. (Here, 4 = Output 4.)

Control Ramp Icon:

Displays whether an

or reverse acting, and w hether the out put
signal str ength is at minimum or maximum
when the sensed prop er t y is at Setpoint .
The control ramp icon displayed i s
determi ned by the outp ut's SP, E P, OSP,
and OEP setup values .

Menu Button:

Press to move through the
sensor and output setup start screens.
When moving through the status or setup
screens, press to return to the status start
screen or set up start scr een.

M

M

Status or Setup Id entifier:
or

OSP

Displays the

unit of me asurement, out put, sensor number,

setup parameter for th e di splayed status or
setup val ue. ( Here, the set up identifier
represents % output signal strength at setpoint.)

Up and Down Buttons:

Press or to select
a differ ent value for an y fl ashing value in the
setup val ue f ield. In the Mai n ( sensor status)
screens, pr ess and hold both and for
5 second s to access the Set up Start screen s.

Status or Setup Value:

or

Displays th e current
input stat us, output status setup param et er
value for t he displayed i nput sensor, outp ut
and/or setup parameter. select
a differ ent paramet er value when th e value
is flashing. (Here, 1 00 = 100%.)

Press or to

M

Green LEDs

associat ed relay output is on or off .

In the Main s c reens,

the (flashing) setup value and go to the
next setu p screen.

1

OSP

4

In 120 VAC app li c ations, L1 mu st be the Hot lead

and L2 must be the Neutral/Common lead.

0-10 VDC or

Analog Output

COM

AO2

AO1

FIG:sys450_app_exmpl

Light-Emitting Diode (LED):

on Relay Control Mod ul e and Relay
Expansion Modules (only) indicates if the

System 450™ Series Control Modules with Relay Outputs Installation Instructions4

00

value tha t identifies the output associ at ed

analog out put (only) is set a s direct-acti ng

FIG:sys450cntrl_m odul

Next Button:

press to scroll through the system st atus
screens. In a setup screen, p r ess to save

Displays a numerical

Setup and Adjustments

Figure 5: Active/Passive Sensor Terminal Pin

Block Set Up for the Example in Figure 3

Sensor 2:

(or removed) sets Sn-1 to Active (Pressure).

Jumper positioned across two

pins sets Sn-2 to Passive (Temperature).

Jumper positioned across two

pins sets Sn-3 to Passive (Temperature).

Sensor 3:

Sn-1
Sn-2

3

Sys450_jmprs

System 450 Component Requirements

A System 450 control system consists of one control
module, one to three control sensor inputs, and one to
ten outputs that provide On/Off control and/or analog
control. Figure 3 shows an example System 450
module assembly with two input sensors and three
outputs (two relay outputs and one analog output).

Sn-

Sensor 1:

Jumper positioned on one pin

Setting Up a System 450 Module Assembly

To set up a System 450 module assembly:

1. Determine the controlled conditions, sensor types,
and value ranges required for your application, and
select the appropriate System 450 sensor types.

2. Determine the number and type (rela y or analog) of
outputs required to control your application, and
select the appropriate System 450 control module
and expansion modules to provide the outputs.

3. Assemble the control and expansion modules in
the proper order, starting with the control module
on the left.

Note: If you use a C450YNN-1 power module, it
must be plugged into the control module. Plug in
any expansion modules (for your control system) to
the right of the power module.

4. Apply supply power to the module assembly.

You can now set up your control system in the
System 450 reset control module UI.

Note: After you power on your module assembly, you
can set up your control system in the control module UI
before wiring the sensors or outputs to your assembly.

Setting Active/Passive Sensor Jumpers

Before putting your System 450 reset control system
into operation, you must set up each sensor in your
system as either passive or active by positioning the
jumper on the terminal pins on the terminal block
located below the sensor terminal block. See Figure 3.

Temperature sensors are passive (two-wire) sensors
and the corresponding jumpers must be positioned
across both pins. Humidity and pressure transducers
are active (three-wire) sensors and corresponding
jumpers must be positioned on one pin (or removed
completely). Figure 5 shows the jumper positions for
the System 450 example shown in Figure 3.

Setting Up a Control System in the User Interface

System 450 control modules have a backlit LCD and a
four-button touch pad UI (Figure 4) that enable you to
set up your control system. To set up a control system
in the System 450 UI:

1. Build your control system module assembly and
connect it to power. See Setting Up a System 450
Module Assembly on page 5.

Note: Every time a module assembly is powered
ON, the control module polls all of the modules to
identify output type (relay or analog) and assigns a
sequential output number (1 to 9 [0 = 10]) to each
output starting with the control module output on
the left. The output numbers identify each output’s
setup screens in the UI. (See Figure 4.)

2. Access the System 450 setup screens in the UI.
See Accessing the System 450 Setup Start
Screens on page 7.

3. Set up the control system inputs in the UI. See

Setting Up System 450 Sensors

4. Set up the control system outputs in the UI. See

Setting Up System 450 Outputs

IMPORTANT: Do not change the module positions
after a System 450 control system is set up in the UI.
System 450 control logic is set up in the UI according
to the Sensor Types, the o utput types, an d the outpu t
numbers. Changing modules or module positions in a
module assembly that is already set up in the UI can
change the output numbers, output type s, an d the
setup values of the assembly outputs, which requires
setting up the outputs again.

Use the worksheet provided on page 24 to plan and
record the settings for your System 450 control system.

on page 7.

on page 10.

System 450™ Series Control Modules with Relay Outputs Installation Instructions 5

Viewing the Startup, Main, and System Status

xxxx

.

2

00

1

74

2

F

OUT

1

On

61

OUT

3

SENS

-- -

OUTR

1

-- -

OUTA

3

-- -

Screens

Every time you connect power to a System 450 control
module, the Startup screen appears for several
seconds before the Main screens appear. The Startup
screen displays the current firmware version for the
module. See Table 2 and System 450 Firmware
Versions for more information.

After you install, wire, power on, and set up your control
system in the UI, the Main screens appear on the LCD,
immediately after the Startup screen. During normal
operation, the Main screens automatically scroll
through the current status of each sensor in your
control system. See Table 2 for more information.

Table 2: System 450 Startup Screen, Main Screens, Status Screens, and Setup Start Screens Information

and Procedures

LCD Screen Name, Description/Function, User Action, and Example

Startup Screen: When you power a System 450 control module, the LCD displays the control module’s

current firmware version for approximately five seconds before it displays the Main (Input Status) screen.
Screen example shows System 450 firmware version number 2.00 on the top of the screen. The number on

the bottom of the screen (indicated in this example with xxxx) identifies the Johnson Controls firmware.
Main (Input Status) Screens: During normal operation, the Main screens automatically scroll through the

232

PSI

current status of each input sensor in your control system and display the sensor number, the unit of
measurement, and the sensed condition value. See Figure 7 and Figure 8 for example Main screens.

Note: Main screens are view-only; selections are not made in Main screens. The Main screens are the
System 450 default screens. After 2 minutes of inactivity in any screen, the UI reverts to the Main screens.

While the Main screens are scroll in g, you can press
System Status screens for all inputs and outputs in your control system.

While the Main Screens are scrolling, you can press and hold and for 5 seconds to access
your control system’s Setup Start screens.
The screen examples show Sensor 1 sensing 232 psi and Sensor 2 sensing 74°F.

System Status Screens: The System Status screens display current status of all inputs and outputs in

your control system. System Status screens are view-only; selections are not made in Status screens.
Relay output status screens display output number and relay status (On/Off). Analog output status screens
display output number, signal strength, and control ramp icon.

Press
control system. When you stop pressing
remains displayed for 2 minutes before returning to the Main Screens.

The screen examples show Output 1 relay is On and Output 3 signal strength is 61% of the total signal
strength. The control ramp icon in the bottom screen example indicates that the Analog Output is set up
with SP<EP and OSP<OEP. See S
Selection Control for information about ramp icons.

Setup Start Screens: Setup Start screens are view-only screens, from which you can access the setup
screens for the sensors or the displayed output; selections are not made in Setup Start screens.The Sensor
Setup Start screen is the first screen displayed when you access the System 450 setup screens.

Note: The numerical order and type of Output Setup Start screens are determined by the modules
selected for your System 450 control system and their physical order in the control system module
assembly. See Setting Up a Control System in the User Interface

From the Sensor Setup Start screen, press repeatedly to scroll through the Output Setup Start
screens for all of the outputs in your control system. When a Setup Start screen is displayed,
press

Note: In any Setup Start screen, you can return to the Main screens by pressing both

simultaneously. Also, the UI returns to the Main screen after 2 minutes of inactivity in any screen.
The screen examples show the Sensor, Relay Output 1, and Analog Output 3 Setup Start screens.

repeatedly to scroll and view the System Status screens for the inputs and outputs in your

etting Up an Analog Output for Standard Control or High Input-Signal

to go to the setup screens for the sensors or the output displayed in the screen.

The System Status screens display the current status
of each input and output in your control system. With
the Main screen displayed, press repeatedly to scroll
through and view all of the status screens in your
control system. See Table 2 for more information about
the System Status screens.

System 450 Firmware Versions

System 450 firmware versions identify the features
available on System 450 modules. Standard System
450 control modules with Version 2.00 firmware and
later include the High Input-Signal Selection and
Differential Control features. See High Input-Signal
Selection on page 9 and Differential Control on page
16 for more information.

repeatedly to scroll through and view the

, the displayed Status screen refreshes its value and

on page 5 for more information.

M

and

System 450™ Series Control Modules with Relay Outputs Installation Instructions6

Accessing the System 450 Setup Start Screens

Access the System 450 Setup Start screens from the
Main screen. See Table 2 for more information about
the Setup Start screens.

To access the System 450 setup screens:

1. Apply power to your module assembly. After the
Startup screen appears briefly (displaying the
control module firmware version), the Main screen
appears on the LCD.

3. Press

M

repeatedly to scroll through the Output

Setup Start screens. See Figure 7.
Note: The UI returns to the Main screens after 2

minutes of inactivity in any screen in the UI.

Setting Up System 450 Sensors

You must set up the input sensors for your control
system before you can set up any of outputs. T o set up
the input sensors you must access the setup screens.
See Accessing the System 450 Setup Start Screens

.

2. In the Main screen, press and hold

and

simultaneously for 5 seconds to access the setup
screens and to go to the Sensor Setup Start
screen.

The Sensor Setup Start screen is the first screen
displayed when you access the system setup screens.

Table 3 provides information about System 450
sensors, Sensor Types, parameter values, and
specified sensor/transducer product code numbers.

Table 3: System 450 Sensor Types, Setup Values, and Sensor/Transducer Product Codes

Sensor
Type

Unit of Measurement
Value
(Condition/Units)

Effective
Sensing
Range

Range of
Usable

Values

1

Resolution
Increment
Value

Minimum
Proportional
or Control

Sensor Product
Type Number

Band

°F °F (Temperature/degrees) -46 to 255 -40 to 250 1 1 A99B-xxx
°C °C (Temperature/degrees) -43 to 124 -40 to 121 0.5 0.5 A99B-xxx

rH % (Humidity/%RH) 1 to 100 10 to 95 1 2 HE-67Sx-xxxxx

P 0.5 INWC (Pressure/in. W.C.) 0 to 0.5 0.025 to 0.5 0.005 0.025 DPT2650-0R5D-AB
P 2.5 INWC (Pressure/in. W.C.) 0 to 2.5 0.1 to 2.5 0.02 0.1 DPT2650-2R5D-AB
P 5 INWC (Pressure/in. W.C.) 0 to 5.0 0.25 to 5.0 0.05 0.25 DPT2650-005D-AB
P 8 bAR (Pressure/bar) -1 to 8 -1 to 8 0.05 0.1 P499Rxx-401C
P 10 INWC (Pressure/in. W.C.) 0 to 10 0.5 to 10 0.05 0.2 DPT2650-10D-AB
P 15 bAR (Pressure/bar) -1 to 15 -1 to 15 0.1 0.2 P499Rxx-402C
P 30 bAR (Pressure/bar) 0 to 30 0 to 30 0.1 0.4 P499Rxx-404C
P 50 bAR (Pressure/bar) 0 to 50 0 to 50 0.2 0.4 P499Rxx-405C
P100 PSI (Pressure/psi) 0 to 100 0 to 100 0.5 1 P499Rxx-101C

3

P110
P200 PSI (Pressure/psi) 0 to 200 0 to 200 1 1 P499Rxx-102C
P500 PSI (Pressure/psi) 0 to 500 90 to 500 1 5 P499Rxx-105C
P750 PSI (Pressure/psi) 0 to 750 150 to 750 2 6 P499Rxx-107C
HI°F °F (Temperature/degrees) -50 to 340

HI°C °C (Temperature/degrees) -45.5 to

Hg/PSI (Pressure/Hg-psi) -10 to 100 -10 to 100 0.5 1 P499Rxx-100C

4

1 1 TE-631x, TE-6000-x

4

0.5 0.5 TE-631x, TE-6000-x

170

-40 to 340

-40 to 170

HE-67Nx-xxxxx
HE-68Nx-0N00WS

TE-68NT-0N00S

TE-68NT-0N00S

2

1. Because of the way that the System 450 Differential Sensor (Sn-d) is set up and calculated with two identical sensors (Sn­1 and Sn-2), the Range of Usable Values is twice as large as a single sensor. Each Sensor Type has an equal number of
positive and negative values. See Table 9 for the Range of Usable Values when an output references Sn-d.

2. Refer to the System 450 Series Modular Controls Product Bulletin (LIT-12011458), Catalog Page (LIT-1900549), or
Technical Bulletin (LIT-120114 59) for additional ordering information for System 450 compatible sensors and transducers.

3. See Setting Up Outputs
reference the P110 Sensor Type.

That Reference a P110 Sensor on page 9 for information on setting up System 450 outputs that

System 450™ Series Control Modules with Relay Outputs Installation Instructions 7

4. Many of the 1,000 ohm Nickel temperature sensors that can be set up as HI°F or HI°C Sensor Types are not designed for

SENS

-- -

P500

Sn-1

°F

Sn-2

--

Sn-3

-3

OFFS

use across the entire Range of Usable Values for HI°F and HI°C Sensor Types. Refer to the Technical Specifications
sections in the TE-6000 Series Temperature Sensing Elements Product Bulletin (LIT-216288), the TE-6300 Series

Temperature Sensors Product Bulletin (LIT-216320), and the TE-6800 Series Temperature Sensor Product Bulletin
(LIT-12011542) to determine the temperature range that the various 1,000 ohm Nickel temperature sensors are specified to

operate in.

T ab le 4 provides sensor setup information, procedures,
and example screens. Figure 7 on page 21 provides a
System 450 UI setup example.

Table 4: System 450 Sensor Setup Screen Information and Procedures (Part 1 of 2)

LCD Screen Name, Description/Function, User Action, and Example

Sensor Setup Start Screen: The Sensor Setup Start screen is the first screen displayed when you

access the System 450 setup screens. From the Sensor Setup Start screen you can navigate to the
Output Setup Start screens or the Sensor Setup screens. See Figure 7.

Note: You must set up the input sensors before you can set up the control system outputs. The Sensor
Setup Start screen is view-only; selections are not made in Setup Start screens.

1. In the Sensor Setup Start screen, press
(Sn-1) and begin setting up the sensors in your control system.

The screen example shows the Sensors Setup Start screen with flashing dashes.
Sensor Type Selection Screens: The Sensor Type you select for an input sensor automatically

determines the setup parameters and values for each output that is set up to reference that sensor. See
Table 3 for information about System 450 sensors/transducers, Sensor Types, condition type, units of
measurement, minimum control band or proportional band, setup values, value ranges, and product code
numbers.

Note: For outputs to operate properly, the selected Sensor Type must match the sensor/transducer
model wired to the control module, and the sensor/transducer must be wired to the proper control module
input terminals.

2. In the Sn-1 Sensor Type Selection screen, press or to select the desired Sensor Type.
Press

3. In the Sn-2 Sensor Type Selection screen, press or to select the desired Sensor Type.
Press to save your selection and go to the Sn-3 Sensor Type Selection screen.

Note: If your control system does not use three input sensors, simply press
flashing in a Sensor Type Selection screen to save no Sensor Type and go to the next setup screen.

4. In the Sn-3 Sensor Type Selection screen, press or to select the desired Sensor Type.
Press

• go to the Temperature Offset Setup screen for the first temperature sensor in your system.

• return to the Sensor Setup Start Screen, if your control system has no temperature sensors.

Note: Beginning with firmware Version 2.00, if you select the same Sensor Type for Sn-1 and Sn-2, two

additional functional sensors (Sn-d and HI-2) are available for selection when you set up the control
system outputs. If you select the same Sensor Type for Sn-1, Sn-2 and Sn-3, then functional sensor HI-3
is also available for selection when you set up outputs. See High Input-Signal Selection

Differential Control

The screen examples show Sn-1 with the P500 Sensor Type selected; Sn-2 with the °F Sensor Type
selected; and Sn-3 with the no Sensor Type selected.

T emperature Offset Selection Screens: Select a temperature offset for the temperature inputs (only) in
your control system.

2

Sensor Type °F enables an offset of +/- 5°F in 1 degree increments.
Sensor Type °C enables an offset of +/- 2.5°C in 0.5 degree increments.

Note: The temperature offset changes the displayed temperature value by the selected offset value.

5. Press or to select the desired temperature offset value. Press :

• to go to the next Temperature Offset Selection screen (if there are additional temperature
sensors in your control system) and repeat this step for each temperature sensor.

• to return to the Sensor Setup Start screen.

The screen example shows an OFFS value of -3 (°F) for Sensor 2. Therefore a sensed temperature value
of 75 (°F) at Sensor 2 is displayed as 72 (°F).

to save your selection and go to the Sn-2 Sensor Type Selection screen.

to save your selection and either:

on page 16 for more information.

to go to the first Sensor Type Selection screen

while the two dashes are

on page 9 and

System 450™ Series Control Modules with Relay Outputs Installation Instructions8