BENSON CP4 Operator's manual

USER & ENGINEER
INSTRUCTION
MANUAL
BENSON
CP4

USERINSTRUCTIONS
CONTENTS PAGE
1
SUBJECT PAGE No.
ContentsPage ...................................................................... 1
CP4 Basic Setting Guide ................................................... 2-3
StandardTerms .................................................................... 4
Normal RUN Mode................................................................ 4
Override ................................................................................. 5
StandbyMode ........................................................................ 5
Date ..................................................................................... 5
HeaterLockoutandReset ..................................................... 5
Summer Fan .......................................................................... 6
ProgramMode
Temperaturesetting ............................................................... 6
DataSetting ........................................................................... 6
TimeSetting ........................................................................... 7
CodeSetting .......................................................................... 7
Holidays ................................................................................. 8
SystemSettings
Override(Maximum)Setup .................................................... 9
OptimisationSetup ................................................................. 9
CodeSetting .......................................................................... 9
Configure-ControlType ........................................................ 9
Configuration/Setup
ConfigureControlSetup(On/Off):PurgeOption,Double
Ignition, Proving Switch .................................................... 10
ConfigureControlSetup(High/Low):HighFlameBoost,
High/Low Differential, Double Ignition, Proving Switch .... 11
SystemWide Setup
Fan Setup............................................................................... 12
SensorCalibration.................................................................. 12
ServiceMode ......................................................................... 12
ServiceAlarm ......................................................................... 12
ResettingService Alarm......................................................... 13
SystemReset ......................................................................... 13
TechnicalDetails
Specification/ Fuse Rating .................................................... 13
Sensor/InputConnections ...................................................... 14
Pleaseconsultthemanual shipped with the heaterfordetailedwiring connections.

CP4 BASIC SETTING GUIDE
INITIAL SCREEN ON RECEIPT. Thedisplaywillshoweitherofthefollowing:
DAY: TIME: INITIAL TEMP SETTING HEAT OFF or
DAY: TIME: and the letters N/C HEAT OFF
Atthispointthecontrolwillrequirecalibration. (A separate thermostatshowingtheactual temperature would
bean advantage for the calibration).
Calibrateby the followingmethod:
Press PROG and key in the engineers code (6343) and press ENTER.
The display shows 4 options - press 4 (SETUP). A further 4 options are displayed. Press 3 (SENSOR).
DisplayshowsINTERNAL SENSOR N (0) Y (1) press1andENTER.Screen shows calibratedINTERNAL XX
and a temperature, key in the correct temperature and press ENTER. The screen will now display calibrate
N/CREMOTE 1 XX(calibrationofthis screen isonlyrequired when usingaremote sensor) fornormaluse with
internal sensor press RUN three times and screen will indicate ADJUSTING SETUP PLEASE WAIT.
Thedisplaywill then indicate:
DATE: TIME: TEMP HEAT OFF
INITIAL SCREEN SETUP END USER
Theend userprogramme settings can now be programmed as follows:
Press PROG key in operators code (0000) and press ENTER to access the options screen.
TEMPERATURESETTING
Toenterthetemperaturerequiredthedisplay shows4 options- press1TEMPandsetthetemperaturerequired.
Press ENTER. The display shows FROST PROTECTION 1 ON 2 OFF. If frost protection is required press1.
Screen shows SET NIGHT PERIOD TEMP (04°C) this setting can be changed if required. If not press ENTER
to return to the 4 options screen.
OPERATINGTIMES
To enter the times that the heater will be required to operate there are 3 ON/OFF times per day available if
required. The 24 hour clock system is used. If a mistake is made press RUN to return to options screen.
On the options screen press 2 DATA and the screen will display MON PERIOD 01 SHH:MM E HH:MM.
Keyin the required starttime(S),e.g.0700and pressENTER. Key in end time(E),e.g.1630andpress ENTER.
The screen will now display DAY PERIOD 02 and a further switching time can be programmed in if required.
Press ENTER and DAY PERIOD 03 will be displayed. IF NEITHER OF THE PERIODS 02/03 ARE REQUIRED
AFTER PERIOD 01 just press ENTER for those periods.
Thescreenwillnow show TUE PERIOD 01. If the switching time is the sameforTuesdayasitwasforMonday,
pressthe PROG(copy)button andtheprogramme willautomaticallycopy theinformationover. Itwilldo thisfor
allthe days of the week.Ifalternativetimesare required they can bekeyedin.If not, pressENTERforthat day.
2

3
DAY AND DATE
On4options screen press3 SYSTEM thenpress1 SYSTEM TIME keyinthecorrecttime and pressENTER.
The screen will change to DATE. Key in date and press ENTER. Screen will display SET DAY OF WEEK
1=MON7=SUN, press thecorrectnumber for thedayof the week.Screenwill change to2option screen, press
RUNtwice to return to main display screen.
SWITCH OFF HEATER
ToswitchOFF theheater atany timeduringnormalprogrammedoperationpressOVER/STANDBYbuttonthen
press2 STANDBY MODE. If the heater is operating, theburner will shut down and the heater willgo through
its shut down sequence and switchOFF.
Toswitch the heaterONpress OVER/STANDBY buttonthenpress2 STANDBY MODE theheaterwillswitch
backto normal operation.
SYSTEM OVERRIDE
Toswitch the heaterON/OFFfora short periodoutsideprogrammed operating timespressOVER/STANDBY
button then press 1 OVERRIDE MODE. This will show 2 options,OVERRIDE 1 On 2 OFF.
If heater is OFF as it is outside its timed programme and you wish to run the heater for a short period press1
andenterthe number of hours you wish to operateinoverridemode(thedefault setting is 4 hours but this can
bechanged through the engineers settingsoptions).
Whenset, thedisplaywill flashperiodicallyand count downtheoverride time.Thesame operationcanbe done
by press 2if the heater is ON and you wish to turn it off for a specific period.
Beforereturningtothenormaloperating period ensure that the override time entered in the overrun period is
deleted.

4
StandardTerms
SelfLearningOptimisationisasystemwherebythe BensonCP4will automaticallycalculatethe startuptime
toensurethebuildingisupto temperature for the programmed switching time. It does this by monitoring the
internaltemperaturereadings,sothatforexample,inmilderweatherconditionsheatuptimesarereduced-thus
savingenergy.
Preheat is the number of hours the control can come on before the programmed switching time (when in
optimising mode) This is setup under the Engineers code and can be set to no more than 8 hours.
Rate of Changeisthetime it takestoraise thebuildingby 1°C.Thefactory default forthissetting is 20minutes
butthe control will automatically adjustthisaccordingtothe fabric of the building.
Override Using the override button on the Benson CP4 keypad allows the user to override the zone for a
selected number of hours, to allow for unscheduled use of the system. A maximum can be set to stop users
enteringlong override periods.
Switchingperiod status:
• Dayiswhenthecontrol is being controlled to an actual switching time (For example between 07.00-
17.00 the control would be in a DAY condition) Outside of these hours the control would be in a night
condition.
•Nightis when noswitchingtimeshave been programmed.Atthese times thecontrolisset back tothe
nighttemperature orfrostprotection.
HeaterLockoutand Resetis standardontheCP4andallowsfor asignal tobefedintotheCP4from the heater
whenthe heater goes to lockout.Once the fault on the heater has been rectifiedaresetsignalcan be sent
tothe heater resetting lockoutstatus.
Normal RUN Mode is when the control is operating normally and is not being programmed (ie showing the
time and date screen). It is important to remember that when any alterations have been made to the CP4’s
program, the RUN button is pressed to return the control to the RUN mode.
Normal RUN Mode
There is one main Normal (Run) mode screen, and one Info screen on the Benson CP4. These are explained
below;
On/Off RUN mode screen
This screen shows the time, actual temperature and the heat relay status (On or Off)
High/Low RUN mode screen
This screen shows the time, actual temperature and the heat status of both high and low flame
Pressingthe Information button followed byoption1willshow the following display:
Thisdisplay showsthe target temperaturealong withthe
switchingperiodstatus.
FRI 07.58 23°C
HEAT OFF
FRI 07.58 23°C
LOW ON HIGH OFF
TARGET TEMP : 21°C
TIME CLOCK: DAY

Override
TheBenson CP4 can be overriddenintoadayor night condition to allowforanyunscheduled operation of the
system. The maximum time that the unit can be overridden will have been set by the installer.
To program an override period
• From the Normal RUN mode
Pressthe Override button and enter your security code if required.
• Then choose 1) to enter the override mode
• Then select either 1 or 2 to override the zone
ON(1) or OFF(2)
• You are now prompted to enter the length of the override period.
• Should the zone be above temperature, the control will show the
followingscreen. Remember that the overridefunctiononlyoverrides
time and not temperature. This error message will also appear if the
overridetime programmed exceeds themaximumoverride setting
• The status screen then indicates the zone has been
putinto an override condition.
To cancel an override period repeat the steps above, choosing 2 for
OFF and then reduce the length of the override period to 00
StandbyMode
In order to put the CP4 into Standby mode, press the Override/Standby button and select 2 for Standby.
The control is then put in to the Standby mode, which means that the temperature is controlled to the night
setbacksetting.
Tocancelrepeatthe above operation.
Date
To display the current time and date:
• Press INFO
• Press 2 for date.
• Tocancel,repeattheaboveoperation.
HeaterLockout/Reset
Asupply canbewiredinto theBensonCP4 from theheaterlockout connectionallowingfor remote indicationof
afault. Once the fault on the heater has been rectified,pressing RESET on thekeypadsendsa reset signal
to the heater to clear the lockout status. This feature is highly beneficial on heaters installed out of reach.
Heater Reset (No lockout indication)
On heaters where there is no heater lockout indication, the Benson CP4 can be used to send a reset signal.
To send a Reset signal in the case:
• Pressthe Info/Reset button
• Press 3 for Reset
The reset relay will be energised for a second.
Mon 13.06 20°C
Time Clock: DAY
1> OVERRIDE MODE
2> SUMMER MODE
OVERRIDE TO
1> ON or 2> OFF
OVERRIDE SETTING
MAXIMUM (04) :03
** WARNING**
INVALID DATA
Mon 13.06 20°C
Status: OVERRIDE
!
1> Override
2>Standby
12.13.49
SAT 11-12-02
1> INFORMATION 2>DATE
3> LOCKOUT RESET
5

ManualSummer Fan
Providingtheinstalled heaters are equipped with a summer fanfacility,theBensonCP4can enable the fan to
giveventilation in summer months.
• Pressing the FAN key displays the following screen.
• At this point you must press ENTER or if you wish to abort this operation press the DELETE key.
To disable the fan, repeat the above operation.
Ifthe FANkeydoes notoperate, thefanoutput isbeingused to giveconstantor automaticsummer fan control.
This is described later in this manual.
ProgramMode
From the Normal (RUN) mode screen, pressing the PROG
buttonwill display thefollowingscreen.
Before you can access the Benson CP4 you must enter the passcode. This passcode is set to 0000 as a
factory default but may be changed at any time by the user to ensure security. This process is explained
under section 4 (code).
Temp
Thissectionisusedtochange the temperature settings.
Pressing1forTempdisplaysthefollowing screen:
• Youarenow prompted to enter the required temperature for the
DAY periods (EG:22). This must be entered as two digits.
• Whencomplete,pressEnter
• Youarenowabletoselectwhether you require frost protection.
Selecting ON enables you to set a NIGHT setback temperature.
• Press Enter when you have set the required night
temperature.
If S.Fan has been enabled, you are prompted to enter the summer fan
temperature.Thesummerfan temperature is calculated by a differential
setting. For example a differential of 03 means that the summer fan
temperature will be 03°C above the day setting. Therefore there is no risk
of the DAY temperature being higher than the Summer Fan setting.
Data
The DATA section is where you are able to set the daily switching periods. There are 3 switching periods per
dayavailable.
• Press PROG and enter the security code
• Now select 2 to enter the DATA menu.
You can see on screen now that we are prompted to enter the switching
period 1 for Monday. So using 24 hour clock notation, enter the required
start time. (EG: 08.00)
Now press enter to accept the Start time and to move the cursor to the end time setting.
We are able to program the required End time, for example 17.00. Don’t forget to use 24 hour clock notation.
Whencomplete,pressEnter to accept the programmed switching time and to move onto period2Monday.
FAN ON?
ENTER TO CONFIRM
!
** WARNING **
ENTRY CODE: ????
1> TEMP 2>DATA
3>SYSTEM 4>HOLS
SET DAY PERIOD
TEMP: 22°C
FROST PROTECTION
1>ON or 2>OFF
SET NIGHT PERIOD
TEMP: 05°c
1>TEMP 2>DATA
3>SYSTEM 4>HOLS
MON PERIOD 1
S:HH:MM E:HH:MM
SUMMER FAN
DIFFERENTIAL: XX
6

Programmingfurtherperiods
You are now able to program period 2 Monday in just the
same way. Press Enter when complete.
Shouldyounot require all three switching periods, simply leave the
times at HH:MM and this period will be ignored.
AtthispointpresstheEnterkey to move onto Tuesday’s switching periods.
You are able to enter the switching periods for Tuesday
In just the same way.
Should the switching periods be the same on Tuesday, you can press the COPY button and this copies all of
theswitchingtimes from the previous day. So, for example,ifyouweretopress the COPY button on Tuesday
period1all of the switching times from Monday wouldbecopied,andthenthe Benson CP4 would move onto
Wednesday.
A screen is displayed to indicate the time have been copied.
To correct any mistakes made, use the DEL Key. If Enter is pressed at any time then
thecurrentsettings will be retained.
System
Thissection allows you to set the system time/date and the security codes for the system.
SystemTime
• From the Normal RUN mode press PROG and enter the user
securitycode.
• Press PROG and enter the user code
• Now press 3 for System
• Now press 1 for System time
• You are now prompted to enter the new time
(Enter this in 24 hour clock notation)
• When you have entered the new time, press the Enter key.
• You are now prompted to enter the System date.
(Date format is DD:MM:YY)
• When you have entered the new date, press the Enter key.
• You are now prompted to enter the day of week.
• When you have entered the new day, press Enter.
The control will revert back to the menu screen. Press RUN to return to the normal RUN mode.
SystemCode
• Press Prog and enter the security code.
• Pressing 3 for System
• Pressing 4 for Code prompts you to select the code you wish to alter.
7
MON PERIOD 2
S: HH:MM E:HH:MM
MON PERIOD 3
S: HH:MM E:HH:MM
TUE PERIOD : 1
S:HH:MM E:HH:MM
COPYING ALL DATA
MON to TUE
!
1> SYSTEM TIME
2>SYSTEM CODE
TIME NOW: 13.07
NEW TIME: HH:MM
DATE IS: 19-05-03
NEW DATE: DD:MM:YY
SET DAY OF WEEK
1==MON- 7==SUN

8
1> Manager Code - This code gives access to all data settings.
2> Override Code - This code gives access to the Override and
Summerfunctions.
Tochange the code, simply enter the new code when prompted.
Press RUN to return to the Normal RUN mode.
Settingthe Manager and Operators code to the same disables the Operators code.
(ie. No code is required to access the operators section)
Holidays
This is the section used to set the known holiday periods for the year when heating in the zone will not be
required.
Five holiday periods can be set. Follow the steps below for instructions on how to set the holiday periods.
• Press the program key and select option 4.
• You are now prompted to enter the holiday period 1.
You must enter the start date in the DD-MM-YY format. When you
have programmed the start date of the holiday press enter.
• Youshouldnow program the length oftheholiday. Youshould calculate the number ofdaysyouwant the
heating off by counting from the first day of your holiday until the last. Now enter the length.
• When the first holiday period is set press the enter key.
• Holidayperiod2willnowbe displayed.
You should program the remaining holiday periods in the same way. When all of the holiday periods have
beenprogrammedthe control will revert back to the Data menu.
ImportantNote:
1. If enter is pressed at any time then the current setting will be retained.
2. To cancel the holiday, put the date to 00.00.00 and length to 00. The holiday will then be cancelled
1> MANAGER CODE
2>OPERATORS CODE
CODE NOW: 0000
NEW CODE:????
!
HOLIDAY PERIOD 1
S:00-00-00 L:00

EngineersSetup
Toenterthe engineers section, press the programbuttonandenterthe Engineers code. (This will befoundon
a label inside the Benson CP4. )
A display like the one shown will now be displayed.
OVER (Override)
This section allows you to enter a limit for the override. Enter two digits
(eg:08 hours) and then press enter to accept the setting.
OPTI (Optimisation)
With the Benson CP4 you are able to set whether optimisation is required (Refer to Terms for further
information).
Should you require optimisation select 1 or 0 to disable it.
SelectingNO willreturnyou totheSetup Menuandturns offoptimisation.This meansthecontrol willswitchthe
heating ON at the programmed switching time and will not allow for any warm up period.
This is the amount of time the heating system takes to raise the building
temperature by 1°C. An average starting point would be 20 minutes but
because the unit is self learning, it will alter itself by 1minute per day to
adjustto the correctsetting.
This is the maximum number of hours before the entered switching time
that the unit could come on to raise the temperature. The maximum
setting is 8 hours but an average setting is 3 hours.
CODE
The code section will work as normal and is used to set the User’s code.
SETUP
Thissection allows us to configure the control, set the required fan mode,
enable or disable the internal sensor and set-up the service mode.
CONFIG (Configuring the Benson CP4)
During the configuration process you will be asked to select the functionality required for the system being
controlled.
• Press PROG
• Enter the Engineer code
• Select 4 for Setup
• Select 1 for Config
• Youarenowprompted to select the control type you require.
ON/OFF = 1 HIGH/LOW =2
9
1> OVERRUN 2> OPTI
3> CODE 4>SETUP
OVERRIDE SETTING
MAXIMUMTIME:08
OPTIMISATION ?
N<O> Y<1> : 1
RATE OF CHANGE
MINUTES /°C: 20
SET PRE-HEAT
MAXIMUM TIME: 03
1> CONFIG 2> FAN
3>SENSOR 4>EXTRA
ON/OFF = 1 OR
HILO = 2 : 1

10
CONFIGURING THE CP4 (ON/OFF TYPE)
PURGE OPTION
You are now prompted to select whether a purge is required.
Selecting N here enables you to bypass the next two displays.
Pre-purgeactivatesrelay3forthe amount of time specified before
the heat relay is activated.
Post-purge will activate relay 3 for the amount of time
Specified after the heat relay has been switched off.
DOUBLEIGNITION
Enablingthis option givesthefollowing functionality.
Whenthe heat relayisactivated for thefirsttime of eachswitchingtime, it willswitchoff after 30seconds.Then
after a further 10 seconds the relay is re-energised and will operate as normal.
This operates at the start of every switching period and is used to ensure
that the heater fires when installed in areas where there is a high level
ofcondensation.
If post purge is enabled, the fan will timeout before the heater re-fires.
PROVING SWITCH
You are now prompted to select whether you have a proving switch
onthesystem.
When there is a demand for heat, the Benson CP4 looks to check firstly that the proving switch is not made.
Relay3 is then energisedgivingpre purge if required.Theproving switch then makesfollowedbyrelay 2 being
energised.
Whenyou have completed the configurationprocedureyouwillbe returned to the setup menuscreen.Atthis
pointyoucan press RUN to return totheNormalRUNmode or you can continue toprogramtheothersettings
byselecting another menu option.
PURGE REQUIRED?
N<0> Y<1> : 1
PREPURGE TIME
<MINS> :00
POSTPURGE TIME
<MINS> :00
DOUBLE IGNITION ?
N<0> Y<1> : 0
PROVING SWITCH?
N<0> Y<1> :0

11
CONFIGURING THE BENSON CP4 (HIGH/LOW TYPE)
HIGH FLAME BOOST
Enablingthis option givesthefollowing functionality.
Wheneverthere is a heat demand,bothhighandlow relays are activated. After1minutethe system checks to
seeifbothhighandlowrelaysarerequired.Ifthetemperatureiswithinthedifferentialprogrammed,thehigh
flamerelayisswitched off.
HIGH/LOWDIFFERENTIAL
When the Benson CP4 is being used to control a two stage heater, you must enter the Hi/Lo differential
setting.
• Youarenowprompted to enter the Hi/Lo differential.
• Adifferential setting of 4 andarequiredtemperatureof 20°Cmeansthatthe control will have lowandhigh
flame active until the actual temperature reaches 16°C. At this point, the high flame will be switched off.
DOUBLEIGNITION
Enablingthis option givesthefollowing functionality.
Whenthe heat relayisactivated for thefirsttime of eachswitchingtime, it willswitchoff after 30seconds.Then
after a further 10 seconds the relay is re-energised and will operate as normal.
This operates at the start of every switching period and is used to ensure
that the heater fires when installed in areas where there is a high level of
condensation.
PROVING SWITCH
You are now prompted to select whether you have a proving switch
onthesystem.
When there is a demand for heat, the Benson CP4 looks to ensure that the proving switch is made. The heat
outputs(High/Low)willbeenergisedwhen the switch is made.
HIGH FLAME BOOST
N<0> Y<1> :0
ENTER THE HILO
DIFFERENTIAL:04
DOUBLE IGNITION ?
N<0> Y<1> : 0
PROVING SWITCH?
N<0> Y<1> :0

12
SYSTEMSETUP
FAN
The Benson CP4 has three fan modes available.
User: In this mode, the user is allowed to manually switch the fan relay on/off by use of the FAN Key.
ConstantFan: On theBensonCP4there is an optiontohavea constant Fan output.Ifenabledthe fan relay will
bepermanentlyON during the programmed switching timesandwilloperateto the optimiser setting.
Summer Fan: Allows the user to enter a summer fan differential. This setting is the number of degrees above
theDAYtemperaturethat the summer fan relay will be activated. Therefore, with a daytemperatureof20and
adifferentialof03 thesmmerfanrelaywill beactivated at23°C.Theminimumdifferentialis 02and themaximum
is 06°C.
SENSOR
The Benson CP4 has an internal sensor which is disabled as a factory
default. To enable it, select 1 for Yes when prompted.
The Benson CP4 has averaging facility. The system will automatically calculate and display the average
reading when any two sensors (internal or remote) are detected.
You are now prompted to calibrate the first sensor, if you have enabled
theinternal sensor you will calibrate this first followed by 1 remote sensor.
If you have not enabled the internal sensor you are prompted to
calibratethefirstand then second remote sensor.
To calibrate, simply enter the new sensor reading after the colon.
EXTRA
SERVICEMODE
From the Normal Run Mode, enter the engineers code and press 4 for Setup, 4 for Extras followed by 1 for
Servicemode.
Youarenowpromptedto:
1> Configure the service mode or
2> Reset the current hours run total held in the unit
Pressing1toconfigure the unit will display the following
screen and will ask you to turn the service mode on of off.
You are now required to enter the number of hours the system may run
beforetheservicemodeshouldbeActivated.PressEntertoaccept
theprogrammed setting.
You should now enter the phone number that you want
displayedwhena service
SERVICE ALARM ACTIVATED
Whenaservicealarmhasbeen activated a warning screen will be displayed for 5 seconds every minute. You
are able to cancel this warning by pressing RESET whilst the warning display is on screen.
Remember that you will not receive further service alarms until the control has been reset by an engineer.
INTERNAL SENSOR
N<0> Y<1> : 0
CALIBRATE (20)
INTERNAL : 23
CALIBRATE (19)
REMOTE 1 : 20
1> CONFIGURATION
2> RESET DATA
SERVICE MODE
N<0> Y<1> : 0
SERVICE MODE
HOURS RUN: 0000
SERVICE MODE
CALL : 0000000000
USER<0> C.FAN <1>
S.FAN <2> : 0

13
RESETTING THE SERVICE ALARM
Afteraservice alarm has been activated you are abletoresetthehourssetting without the need to reprogram
thetelephone number by selecting ResetfromtheConfiguration/Resetscreen.
SYSTEM RESET
Thisfunctionresetsthe Benson CP4’s settings back to the factory default.
To put the control through a reset:
• Press 4 for Setup
• Press 4 for Extra
• Press 2 for Reset
• Pressing ENTER at this point will erase all data. To abort press the DELETE Key.
RESET ALL DATA?
ENTER TO CONFIRM
Enclosure: ABS Fire Retardant
Dimensions: 222mm x 156mm x 61mm (Length, Height,Depth)
Weight: 1.3 kg
Relays: Relay1-3 normally open contacts
Relay 4 normally open, normally closed contacts
10 amp 230v rating relays 1-3
Alarm Input: 230v AC. 5mA Max.
Supply: 230v AC ±10% 50Hz
Sensors: Only use Heatmiser Sensors. Twin screened cable (Beldon 8451)
Battery: 3 years (Replacement battery: CR2430)
Fuses: FS1: 800mA Antisurge
FS2: 315mA Quick blow
FS3: 315mA Quick blow
SYSTEMSPECIFICATIONS

REMOTE SENSORS
+
1
2
+
-
INPUT1
INPUT2
12V
S
+
-
S
SENSOR2
(OPTIONAL)
1
+
-
S
SENSOR
proving switch
(Optional)
Override switch (Optional)
Sensor and input wiring
Beldon 8451 (RS 360-649) Twin, Screened cable must be used when connecting the remote sensors
MISTRAL
11
01
14
CP4