Operating instructions

1.5 Theory of Operation

User Interface Display

Explanation

STANDBY

Boiler operates in standby mode until demand for

Central Heat (CH) or Domestic Hot Water (DHW) is

detected.

User Menu

User Menu structure includes:

• ‘Boiler Status’ submenu– User can monitor general boiler

status parameters such as sensor temperatures and pump

operation.

• ‘Settings’ submenu – User can view CH , adjust DHW

supply water set points and also select control language.

• ‘Cascade Status’ submenu – Boiler set to function as

part of multiple boiler installation; submenu used to view

runtime parameters. See Multiple Boiler Manual.

Boiler Status

Supply Temperature set point displayed.

If boiler running in CH mode, CH set point displayed.

Note:

• While running in Outdoor Reset mode, this value may

change in proportion with the outdoor temperature.

• If the boiler is running in DHW mode, the DHW supply set

point is displayed.

Several boiler runtime parameters can be viewed while in

‘Boiler Status’ submenu.

Operational status of pump system also shown.

Information available during all states of boiler operation.

Sensor values with troubleshooting tree used to diagnose

typical problems.

APPENDIX A - CONTROL MODULE