10
To hot outlets
Primary flow
Primary return
T&P relief
valve
Expansion
vessel
Balanced cold
water connection
(if required)
Cold water
combination
valve
Mains water
supply
Isolating valve
(not supplied)
Discharge
pipe
Tundish
Drain cock
(not supplied)
Secondary return
tapping (if required)
Inlet
NOTE: Primary heating coil
fitted on PP100B to PP300B
models only
Boost element/
control housing
(PP120E to PP300E
models only)
Element/
controls
housing
Fig. 6: Typical installation - schematic
INSTALLATION - DIRECT UNITS
PLUMBING CONNECTIONS
PremierPlus direct 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
ELECTRICAL SUPPLY
Direct models are fitted with two 3kW immersion
heaters as standard. It is recommended that these
should be wired via a suitable controller to BSEN
60730. The PremierPlus MUST be earthed.
All wiring to the unit must be installed in accordance
with the latest IEE Wiring Regulations and the circuit
must be protected by a suitable fuse and double pole
isolating switch with a contact separation of at least
3mm in both poles. The live and neutral connections
are made directly onto the combined thermostat and
thermal cut-out located under the terminal cover(s)
mounted on the side of the unit. The earth connection
should be made to the earth connection located to
the side of the immersion heater boss(es). The supply
cable must be routed through the cable gland located
on the unit casing beneath the terminal housing.
DO NOT operate the immersion heaters until the
cylinder has been filled with water.
B
R
O
W
N
B
LU
E
G
R
E
E
N
/Y
E
LL
O
W
A
B
Fused (13A) double
pole isolating
switch
1.5mm² 3 core
HOFR sheathed
cable
Thermostat
Earth
connection
Note: On models fitted with two elements each elements must be
wired individually in accordance with the diagram
Fig. 7: Direct electrical connections (schematic)