SYX66x Commissioning Guide
V1.10.3 300117
Page 54 of 61
13.
Connections Menu Pages
13.1
Switch Page
The installer can select the use of a 0-10v Output available from Pin 7 on the controller.
Pump Changeover Modules Selection. If PMPCO modules are used select minimum frequency of change over.
The options are freely selected using the switch in level 2 access. The singular options are as follows:
VT Valve
– This provides a 0-10v signal to the VT Valve Actuator. The VT Valve can be overridden in the Heating
Control Menu and the signal will follow this request.
Boiler Setp
– This provides a direct output to the boiler(s) that can accept a 0-10v signal for the provision of a set point.
Please check with your boiler manufacturer about the sharing of the signal and the scaling of the output required. E.g.
0v = 20’C, 9v = 87’C etc. This value is directly calculated from the maximum of HWS Primary and VT Heating Set
point.
Boiler Demand % - This provides a 0-100% control signal for direct to condensing boilers. When the lead boiler is in
demand the signal will be raised to 2v then a ramp will increase over the signal range to 10v. This signal will only be
generated when there is a demand for heating and the boiler flow sensor is connected and working.
Always check the input impedance and rating of the signal to the boilers. 0-10v Amplifiers are available from
SyxthSense if required.
Note: 0-10v Signal is not suitable to drive 1RM 12v Coil relays.
If the Boiler Demand signal is being used for direct connection to a step controller such as the BPRO4, BPRO4-A, or
BPRO10 then the BPRO option must be selected to YES in the Boilers Set-Up menu. The removes the 2v starting
limit.
