Technical data

9
4.0 INSTALLATION - DIRECT
UNITS
4.1 PLUMBING CONNECTIONS
Direct units require the following pipework connec-
tions.
• Cold water supply to and from inlet controls.
• Outlet to hot water draw off points.
• Discharge pipework from valve outlets to
tundish.
4.2 ELECTRICAL SUPPLY (FIG. 6)
100 litre direct Premier Plus units are tted with one
3kW immersion heater, all other direct models are
tted with two 3kW immersion heaters as standard.
It is recommended that these should be wired via a
suitable controller to BSEN 60730. The Premier Plus
MUST be earthed. The 250 and 300 litre units have
an additional boss which has a blanking plug tted.
An additional immersion heater can be tted in place
of the blanking plug where a higher electrical input
is required for faster recovery times, order Part No.
95 970 510 if required.
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 connec-
tion 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 San-
ton Premier Plus has been lled with water.
4.3 SAFETY
DISCONNECT FROM THE MAINS SUPPLY
BEFORE REMOVING ANY COVERS.
Never attempt to replace the immersion heater(s)
other than with the recommended Santon 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 rmly onto
the corresponding terminations on the element plate
assembly.
In case of difficulty contact Santon service, tel:
5.0 INSTALLATION - INDIRECT
UNITS
5.1 PLUMBING CONNECTIONS
Indirect units require the following pipework con-
nections.
• 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.
Primary connections are 22mm compression. How-
ever, 3/4”BSP parallel threaded ttings can be tted
to the primary coil connections if required.
5.2 ELECTRICAL SUPPLY (FIG. 6)
All Indirect units are tted with a 3kW immersion
heater and a combined thermostat and thermal cut-out
to control the indirect heating source. The Premier
Plus 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 termi-
nal housing.
DISCONNECT FROM MAINS SUPPLY BE-
FORE REMOVING ANY COVERS. DO NOT
BYPASS THE THERMAL CUT-OUTS IN ANY
CIRCUMSTANCES. Ensure the thermostat and
thermal cut-out sensing bulbs are pushed fully into
the pockets on the element plate assembly.
5.3 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 Premier Plus should not exceed 2.5m.
5.4 PRIMARY CIRCUIT CONTROL
The 2 port motorised valve supplied with the Premier
Plus indirect units MUST be tted to the primary ow
to the Premier Plus heat exchanger and wired in series
with the indirect thermostat and thermal cut-out tted
to the unit.
Primary circulation to the Premier Plus heat exchanger
must be pumped, gravity circulation WILL NOT
WORK.
5.5 SPACE AND HEATING SYSTEMS CONTROLS
The controls provided with the Santon Premier Plus
will ensure the safe operation of the unit within a
central heating system. Other controls will be neces-
sary to control the space heating requirements and
times that the system is required to function (see
Fig. 7). The Santon Premier Plus is compatible with
most heating controls, examples of electrical circuits
are shown in Figs. 7 and 8. However, other systems
may be suitable, refer to the controls manufacturers’
instructions, supplied with the controls selected, for
alternative system wiring schemes.