11
SAFETY
DISCONNECT FROM THE MAINS SUPPLY BEFORE
REMOVING ANY COVERS.
Never attempt to replace the immersion heater(s)
other than with the recommended PremierPlus
immersion heater(s).
DO NOT BYPASS THE THERMAL CUT-OUT(S) IN
ANY CIRCUMSTANCES
. Ensure the two male spade
terminations on the underside of the combined
thermostat and thermal cut-out are pushed firmly
onto the corresponding terminations on the element
plate assembly.
In case of difficulty contact service support; contact
details available at the back of this booklet.
INSTALLATION - INDIRECT UNITS
PLUMBING CONNECTIONS
PremierPlus indirect cylinders require the following
pipework connections.
Cold water supply to and from inlet controls.
•
Outlet to hot water draw off points.
•
Discharge pipework from valve outlets to
•
tundish
Connection to the primary circuit.
•
All connections are 22mm compression. However,
3/4”BSP parallel threaded fittings can be fitted to the
primary coil connections if required.
ELECTRICAL SUPPLY
1 2 3
B
A
1
1
2
2 3
Green/
yellow
Indirect thermal
cut-out
Indirect
thermostat
Terminal
block
Green/
yellow
To indirect system
controls junction
box - see Figs . 8/9
13 amps mains
supply. 1.5mm²
min cable size
Brown
Blue
Direct
thermostat
Fig. 8: Indirect electrical connections (schematic)
All units are fitted with a 3kW immersion heater and a
combined thermostat and thermal cut-out to control
the indirect heating source. The PremierPlus cylinder
MUST be earthed.
All wiring to the unit must be installed in accordance
with the latest IEE Wiring Regulations and the supply
circuits must be protected by a suitable fuse and
double pole isolating switch with a contact separation
of at least 3mm in both poles. All connections are
made to the terminal block located under the terminal
cover mounted on the side of the unit. The supply
cable(s) must be routed through the cable grip(s) in
the terminal housing.
DISCONNECT FROM MAIN SUPPLY BEFORE REMOVING
ANY COVERS. DO NOT BYPASS THE THERMAL CUT-
OUT(S) IN ANY CIRCUMSTANCES. Ensure the
thermostat and thermal cut-out sensing bulbs are
pushed fully into the pockets on the element plate
assembly.
BOILER SELECTION
The boiler should have a control thermostat and non
self-resetting thermal cut-out and be compatible with
unvented storage water heaters.
Where use of a boiler without a thermal cut-out is
unavoidable a “low head” open vented primary
circuit should be used. The feed and expansion
cistern head above the PremierPlus cylinder should
not exceed 2.5m.
PRIMARY CIRCUIT CONTROL
The 2 port motorised valve supplied with the
PremierPlus cylinder MUST be fitted on the primary
flow to the PremierPlus cylinder heat exchanger
and wired in series with the indirect thermostat and
thermal cut-out fitted to the unit.
Primary circulation to the PremierPlus cylinder heat
exchanger must be pumped; gravity circulation WILL
NOT WORK.
SPACE AND HEATING SYSTEMS CONTROLS
The controls provided with the PremierPlus cylinder
will ensure the safe operation of the unit within
the central heating system. Other controls will be
necessary to control the space heating requirements
and times that the system is required to function. (See
Fig. 7, page 10)
The PremierPlus cylinder is compatible with most
heating controls, examples of electrical circuits
are shown in Figs. 9 and 10 (page 12). However,
other systems may be suitable, refer to the controls
manufacturers’ instructions, supplied with the
controls selected, for alternative system wiring
schemes.