15
xtra
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Installation & Servicing
INSTALLATION
If the boiler is providing both CH and DHW, and the CH circuit
is to operate for periods at a reduced temperature (i.e.
weather compensated), then it is necessary to differentiate
between CH and DHW heat demands. For this purpose a
DHW demand can be placed on the boiler using the 2
methods shown below.
A demand for DHW has priority over CH for a period controlled
by parameter 43.
A call for DHW will cause the boiler to run and maintain a set
flow temperature controlled by parameters 1 and 21.
Input terminals are available for connecting a DHW heat
demand by:
1. ON/OFF using a 230V switched to live 'DHW call'
terminal (e.g. a cylinder thermostat and programmer).
A call for heat will cause the boiler to run and maintain a
set flow temperature controlled by parameter 1 +
parameter 21.
17 DHW CONTROLS CONNECTIONS
Input terminals are available for connecting a variety of system
controls for central heating demand.
Heating demand can be controlled by:
1. ON/OFF using a 230V switched live to 'CH call' terminal.
(e.g. programmer and/or room thermostat).
A call for heat will cause the boiler to run and maintain a set
flow temperature controlled by parameter 4 or with the
addition of the Outside Sensor Kit fitted (automatically
detected) the boiler will run at a weather compensated flow
temperature (see instructions with kit for more details).
2. Outside Sensor Kit.
Like in option 1 above the Outside Sensor Kit can be fitted
to the boiler generating a weather compensated flow
temperature. Unlike option 1 this configuration reacts
differently to the application of a 230V switched live to 'CH
call' terminal. When no signal is applied to 'CH call' the
boiler is not switched off but simply reduces the flow
temperature by a fixed value (parameter 20) (see
instructions with kit for more details).
3. Programmable Room Thermostat Kit.
The programmable room thermostat kit incorporates a
room temperature sensor and a programmer capable
of controlling the heat output from the boiler to satisfy
different temperature requirements at different time
periods. Optimised starts are possible and the
addition of an Outside Sensor Kit will enable a weather
compensated flow temperature.
4. Modulating Sequencer Kit.
A Modulating Sequencer Kit is capable of controlling the
heat demand on up to 5 boilers simultaneously. (See
instructions with kit for more details.)
5. 0-10V BMS Kit
Applying an analogue 0-10V supply to the boiler via this
optional kit can control either the set flow temperature
or the heating capacity. (See instructions with kit for
mode details).
Output terminals are provided for a circulating pump which
must be connected to allow the pump overrun function to
operate. A pump requiring more than 1 amp supply current
must be connected via a relay.
16 CH CONTROL CONNECTIONS
2. ON/OFF using a Tank Sensor Kit.
Connection of this sensor cannot be in conjunction with
a standard programmer. Installation of our
Programmable Room Thermostat Kit provides the facility
to shut off DHW supply during chosen night-time
periods. The Tank Sensor Kit provides actual DHW
temperatures to the boiler allowing closer load matching
when satisfying DHW demands. (See instructions with
kit for more details).
Output terminals are provided for a DHW pump or valve.
This output can be used to control the diversion of flow to the
DHW circuit. The type of pump or valve employed can be
controlled by parameter 46. A pump or valve requiring more
than 1 amp supply current must be connected via a relay.
INST
ALLA
TION
