Specifications

16
5.1 BOILER SELECTION
The Premier Plus SystemFit models are suitable for use with most gas or oil red or electric
boilers compatible with unvented systems i.e. tted with a temperature control thermostat and
thermal cut-out.
If in doubt consult the boiler manufacturer.
Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic
control unless additional and appropriate safety measures are installed should NOT be used.
The boiler used can either be a sealed system or open vented type, maximum primary circuit
pressure 3 bar.
The primary ow from the boiler MUST be pumped. Gravity circulation will not work due to the
special design of the primary heat exchanger.
The boiler ow temperature should usually be set to 82
o
C (maximum ow temperature to
primary heat exchanger 90
o
C).
The boiler cannot be vented through the Premier Plus SystemFit unit.
5.2 INDIRECT THERMAL CUT-OUT AND 2-PORT MOTORISED VALVE
To comply with Building Regulations and to prevent the Premier Plus from overheating the
2-Port motorised valve supplied tted to the primary ow to the indirect coil MUST NOT be
removed or bypassed. This valve is factory wired in series with the indirect thermal cut-out such
that the primary ow to the heating coil is interupted should the Premier Plus SystemFit unit
overheat.
5.3 WIRING
All electrical wiring should be carried out by a competent electrician and be in accordance with
the latest I.E.E. Wiring Regulations.
The Premier Plus SystemFit Indirect Thermostat and Thermal Cut-out, primary circulating
pump and motorised valves are factory pre-wired. Further wiring will be required between the
Wiring Centre, the Programmer, Room Temperature Sensor and the boiler (see Diagram 9). Ad-
ditional controls and wiring will be required if a second CH zone is to be tted to the instalation.
The Indirect Thermal Cut-out MUST NOT be bypassed.
5.4 HEATING SYSTEM CONTROLS
The controls provided with the Premier Plus SystemFit will ensure the safe operation of the unit
within a central heating system.
Connection to the various system components is made via the Wiring Centre tted to the front of
the Premier Plus SystemFit . Refer to Diagram 9 and the terminal identication labels within the
Wiring Centre to aid in connecting the various external system components such as the mains
supply, programmer and boiler. The wiring to the external components is made using exible
cable, this should be secured using the integral cable grips located in the Wiring Centre.
Provision is made for the connection of a second CH zone (connection pipe supplied blanked
off). Additional controls will be necessary to control the operation of the second CH zone, usu-
ally a second 28mm CH zone valve and a programmable room thermostat. Connection termi-
5
Installation - Primary Circuit