Technical data
USER INSTRUCTIONS
WARNINGS
IF WATER ISSUES FROM THE TEMPERATURE/PRESSURE RELIEF VALVE ON THE PREMIERPLUS CYLINDER SHUT DOWN THE BOILER.
DO NOT TURN OFF ANY WATER SUPPLY. CONTACT A COMPETENT INSTALLER FOR UNVENTED WATER HEATERS TO CHECK THE
SYSTEM. DO NOT TAMPER WITH ANY OF THE SAFETY VALVES FITTED TO THE PREMIERPLUS SYSTEM. IF A FAULT IS SUSPECTED
CONTACT A COMPETENT INSTALLER.
BENCHMARK
The PremierPlus cylinder is covered by the Benchmark Scheme which aims to improve the standards of installation and
commissioning of domestic heating and hot water systems in the UK and to encourage regular servicing to optimise safety,
efciency and performance. Benchmark is managed and promoted by the Heating and Hot water Industry Council. For more
information visit www.centralheating.co.uk.
Please ensure that the installer has fully completed the Benchmark Checklist (Page 24 and 25) of this manual and that you have
signed it to say that you have received a full and clear explanation of its operation. The installer is legally required to complete
a commissioning checklist as a means of complying with the appropriate Building Regulations (England and Wales).
All installations must be notied to Local Area Building Control either directly or through a Competent Persons Scheme. A
Building Regulations Compliance Certicate will then be issued to the customer who should, on receipt, write the Notication
Number on the Benchmark Checklist.
This product should be serviced regularly to optimise its safety, efciency and performance. The service engineer should
complete the relevant Service Record on the Benchmark Checklist after each service.
TEMPERATURE CONTROLS – DIRECT UNITS IMMERSION HEATER(S)
A combined adjustable thermostat and thermal cut-out is provided for each immersion heater. The thermostat is factory set
to give a water storage temperature of approx. 55° to 60°C. Access to the thermostat can be made by opening the immersion
heater cover - DISCONNECT THE ELECTRICAL SUPPLY BEFORE OPENING THE COVER(S). Temperature adjustment is made
by inserting a at bladed screwdriver in the slot on the adjustment disc on top of the thermostat and rotating, (see Fig 8,
page 12) for adjustment details. If in any doubt contact a competent electrician. DO NOT bypass the thermal cut-out(s) in
any circumstances.
TEMPERATURE CONTROLS - INDIRECT UNITS
The PremierPlus cylinder units are tted with a combind thermostat and thermal cut-out. These controls must be wired in series
with the 2 port motorised zone valve supplied to interrupt the ow of primary water around the heat exchanger coil when the
control temperature has been reached. The controls are located within the lower terminal housing along with the immersion
heater thermostat. The thermostat is factory set to give a water storage temperature of approx. 55°C to 60°C. Access to the
thermostat can be made by opening the terminal housing cover - DISCONNECT THE ELECTRICAL SUPPLY BEFORE OPENING
THE COVER. Temperature adjustment is made by inserting a at bladed screwdriver in the adjustment knob and rotating. The
minimum thermostat setting is 10°C. The maximum thermostat setting is 72°C. (see Fig 8, page 12) for adjustment details. If
in any doubt contact a competent electrician.
An immersion heater is also provided for use should the indirect heat source be shut down for any purpose. The immersion
heater control temperature is set using the immersion heater thermostat. DO NOT bypass the thermal cut-out(s) in any
circumstances.
FLOW PERFORMANCE
When initially opening hot outlets a small surge in ow may be noticed as pressures stabilise. This is quite normal with unvented
systems. In some areas cloudiness may be noticed in the hot water. This is due to aeration of the water, is quite normal and
will quickly clear.
OPERATIONAL FAULTS
Operational faults and their possible causes are detailed in the Fault Finding section of this book, (p.19). It is recommended
that faults should be checked by a competent installer.The air volume within the expansion vessel will periodically require
recharging to ensure expanded water is accommodated within the unit. A discharge of water INTERMITTENTLY from the
expansion valve will indicate the air volume has reduced to a point where it can no longer accommodate the expansion.
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