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Betacom c Engineer Support
Welcome to the Engineer Technical Support section. Please use the different sections below to find answers to your technical questions. You can also find a range of useful contact numbers, including Technical support, here.
Fault Finding diagram
Fault Finding Information
Wiring Diagram
Fault Finding Information
Dip Switch Adjustments
DS1 & DS7 is used for gas selection
DS2: Pump Working Mode Selection
OFF: Pump works continuously in CH mode ( factory setting )
ON : Pump stops 45 secs. after burner shuts down
DS3: DHW Mode / CH Mode Transition Time Selection
OFF: Waiting 45 secs. in DHW mode, in case any DHW demand occurs
ON: Instant transition from DHW to CH
DS4: Combi Type Selection
OFF: Standard Combi
ON: Combi with extra water storage tank
DS6: Floor Heating Selection
OFF: 30-85°C CH temp. Mode
ON: 30-50°C CH temp. mode
P7= Ignition capacity adjustment set to 4 0 clock position which is approx 4 to 5 m/bars
P5 Antifast cycle position set to 12 0 clock = 45 seconds.
P2 Central heating capacity adjustment. Clockwise capacity increases. Set to 4 0 clock position
- FAN = 80 W With hall effect function integrated
- VOLTAGES
- At Rest
- White 4.5 VDC
- Grey 0
- Red 4.5 VDC
- Running
- White 2.7 VDC
- Grey
- Red 2.7 VDC
FULL FLAME – 10 VDC APPROX
LOW FLAME – 3.5 VDC APPROX
BURNER PRESSURESEV1, EV2 coils 230 VAC
24 = 2.0 – 12.5 mbars
30 = 3.5 – 14 mbars
Coil resistance Ev1 and Ev2 = 7 kohms
COMPONENT SPEC
DOMESTIC HOT WATER SENSOR
AT REST
RED - 4.6 VDC
WHITE – 0
GREY – 0 OR 4.5 VDC DEPENDING ON POSITION WHERE SPINNER LANDS ON SENSOR
OPERATING
RED - 4.6 VDC
WHITE – 0
GREY – 2.1 VDC
LOW PRESSURE SWITCH
34 VDC @ 1.6 BAR
BETACOM C
DIP SWITCH CONFIGURATION
Dipswitches 1 & 7 used for gas selection
NG Dip 1 OFF Dip 7 OFF
LPG Dip 1 OFF Dip 7 ON
Dipswitch 2 used for pump selection mode
OFF – Pump runs continuously in CH mode (Factory setting)
ON - Pump stops 45 seconds after burner shuts down
Dipswitch 3 used for ‘waiting’ time after DHW drawn
OFF – Waits for 45 seconds if DHW drawn while in CH mode before firing again for CH (Factory setting)
ON – Instant transition from DHW to CH
Dipswitch 4 used for combi type selection
OFF – Standard combi (Factory setting)
ON - Extra DHW storage tank – Not an option in UK
Dipswitch 5 used for additional pump selection
OFF – Pump working in CH mode (Factory setting)
ON - Combi pump not working in CH mode. Additional pump(s) can be connected to system (zones) – Not an option in UK
Dipswitch 6 used to adjust maximum heating temperature
OFF – 30 - 85°C (Factory setting)
ON - 30 - 50°C
Dipswitch 8 used to set maximum fan speed
OFF – 24KW
ON - 28KW
POTENTIOMETER ADJUSTMENTS
P7 – Ignition burner pressure adjustment
Set at 4 o’clock position = 5 > 6 mbars
P5 – Cycling time adjustment
Set at 12 o’clock position
P2 – Range rating
P4 – Not used
VOLTAGES
Fan Hall effect sensor
Measured at PCB. Red wire at connection CN4. White & Grey wires at connection X14.
At Rest
White – 4.5 vdc
Grey – 0 vdc
Red – 4.5 vdc
Running
White – 2.7 vdc
Grey – 0 vdc
Red – 2.7 vdc
Gas Valve
EV1 & EV2 coils – 230 vac
Modulator coil – 17 vdc maximum
Full flame – 10 vdc approx
Low flame – 3.5 vdc approx
Burner pressures
24 = 2.0 – 12.5 mbars
30 = 3.5 – 14 mbars
3 Way Valve motor
Motor drives out for CH & drives in for DHW
CH demand
White – 230 vac
Red – 0.5 vac
Black – 0.5 vac
DHW demand
White – 0.5 vac
Red – 230 vac
Black – 0.5 vac
DHW Flow Sensor
At Rest
Red – 4.6 vdc
White – 0 vdc
Grey – 0 or 4.5 vdc
Running
Red – 4.6 vdc
White – 0 vdc
Grey – 2.1 vdc
Loss of Water Pressure Switch
34 vdc @ 1.6 BAR
MAXIMUM FLUE LENGTHS
24 KW – Horizontal = 3m – Restrictor required up to 1m
– Twin flue = 20m – Restrictor required up to 2m
30 KW – Horizontal = 3m – Restrictor required up to 1m
– Twin flue = 20m – Restrictor required up to 1m
Sequence of Operation
DOMESTIC HOT WATER DEMAND
1 ) Mains on LED will be illuminated.
2 ) Domestic hot water temperature control turned up above set point.
3 ) Summer winter control turned to summer / summer and winter position.
4 ) With the tap turned on the flow switch should make and 2.1vdc on the grey wire should be recorded at the X10 connection on the PCB indicating that the hall effect flow switch is spinning.
5 ) The motorized valve will motor ( out ) with 240 volts ac recorded between red and black on J14/15 on X19 of the PCB.
6 ) The pump and fan will run ( 240 volts ac ). At X12 ( J 16/17 pump ) ( J 19/20 fan ).
7 ) With the fan and pump running, the air pressure switch will operate and 30vdc approx will be recorded at both wires on the PCB air pressure switch connection. Test to earth X16 J64/65
8 ) The gas valve solenoid will be energised, and the spark generator will commence sparking and the boiler should fire. The sparking will continue for 3 seconds after ignition and then cease.
9 ) The gas valve modulator will modulate dependant upon the resistance of the domestic hot water thermister from 13 volts dc full flame down to 3.5 volts dc low flame.
10 ) At the end of domestic hot water the pump will run for a further 3 seconds, and the fan will continue to run for 45 seconds.
CENTRAL HEATING
1 ) Mains on LED will be illuminated.
2 ) With inbuilt timer and any external controls ( room stat ) calling for heat.
3 ) With the summer / winter control turned to the summer / winter position.
4 ) With the heating temperature control turned up above set point.
5 ) The motorized valve will motor ( in ) with 240 volts ac recorded between white and black on the X 19 ( J 13/15 ) connection of the PCB.
6 ) The fan and pump will run 240 volts ac at X 12 ( J16/17 pump ) ( J 19 /20 fan ).
7 ) With the fan and pump running, the air pressure switch will operate with 30 volts dc at both connections. Test to earth on X16 ( J 64/65 ).
8 ) The gas valve will be energised, and the spark generator ( on the PCB ) will commence sparking and the boiler should fire. The spark generator will continue for a further 3 seconds and then cease.
9 ) The gas valve modulator will modulate dependent on the resistance of the heating thermister from 13 volts dc full flame down to 3.5 volts dc low flame.
10 ) Once the temperature of the heating has reached set point the burner will switch off and the fan will continue to run for 45 seconds.
11 ) At the end of a call for heating ie time clock off time reached the fan will run for 45 seconds and the pump will overrun for 10 seconds.
NB The three way valve will return to the domestic hot water position.
Domestic hot water demand while central heating is on.
1 ) Tap turned on should make and 2.1 vdc on the grey wire should be recorded at the PCB indicating that the hall effect flow switch is spinning.
2 ) The motorized valve will motor ( in ) with 240 volts ac recorded between red and black on the PCB.
3 ) The fan and pump will not be interrupted and will continue to run. The main burner will continue ensuring a smooth transition between heating and hot water.
4 ) At the end of domestic hot water the burner will switch off and the pump and fan will continue to run, after 15 seconds the pump will stop but the fan will continue for a further 30 seconds, and then switch off. After 5 seconds the three way valve will move to heating position ( out ) with 240 volts ac recorded between white and black of the PCB.
The pump and fan will now run and the boiler fire to continue the heating request.
Fault Codes
Fault Diagnostic Lights
SOLID light means Temperature Range
FLASHING light means Lockout Fault
Gas Settings
Roomstat Wiring
Available Literature