Technical data

3
2.0 GENERAL REQUIREMENTS
2.1 COMPONENTS SUPPLIED
1. Premier Plus unvented water heater incorporating
immersion heater(s) and thermal controls
2. Factory tted Temperature/Pressure Relief Valve
3. Cold Water Combination Valve.
4. Expansion Vessel and mounting bracket.
5. Tundish.
6. Motorized Valve (Indirect models only).
7. Compression nuts and olives
8. Immersion heater key spanner
2.2 SITING THE UNIT
The Santon Premier Plus must be installed vertically.
Although location is not critical, the following points
should be considered:
• The Santon Premier Plus should be sited to ensure
minimum dead leg distances, particularly to the point
of most frequent use.
• Avoid siting where extreme cold temperatures
will be experienced. All exposed pipework should be
insulated.
• The discharge pipework from the safety valves
must have minimum fall of 1:200 from the unit and
terminate in a safe and visible position.
• Access to associated controls and immersion
heaters should be possible to allow for periodic servic-
ing and maintenance.
• Ensure that the base chosen for the Santon
Premier Plus is level and capable of permanently
supporting the weight when full of water (see Table
2).
2.3 WATER SUPPLY
Bear in mind that the mains water supply to the
property will be supplying both the hot and cold wa-
ter requirements simultaneously. It is recommended
that the maximum water demand is assessed and the
water supply checked to ensure this demand can be
satisfactorily met.
NOTE: A high mains water pressure will not always
guarantee high owrates.
Wherever possible the mains supply pipe should be
22mm. We suggest the minimum supply requirements
should be 1.5 bar pressure and 20 litres per minute
owrate. However, at these values outlet owrates
may be poor if several outlets are used simultane-
ously. The higher the available pressure and owrate
the better the system performance.
The Santon Premier Plus has an operating pressure of
3.5 bar that is controlled by the Cold Water Combina-
tion Valve. The Cold Water Combination Valve can be
connected to a maximum mains pressure of 16 bar.
2.4 OUTLET/TERMINAL FITTINGS (TAPS, ETC.)
The Santon Premier Plus can be used with most
types of terminal ttings. It is advantageous in many
mixer showers to have balanced hot and cold water
supplies. In these instances a balanced pressure cold
water connection should be placed between the Cold
Water Combination Valve and the Premier Plus water
heater. Outlets situated higher than the Santon Premier
Plus will give outlet pressures lower than that at the
heater, a 10m height difference will result in a 1 bar
pressure reduction at the outlet.
2.5 LIMITATIONS
The Premier Plus unvented water heater should not be
used in association with any of the following:
• 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.
• Ascending spray type bidets or any other class 1
back syphonage risk requiring that a type A air gap
be employed.
• Steam heating plants unless additional and ap-
propriate safety devices are installed.
• Situations where maintenance is likely to be
neglected or safety devices tampered with.
• Water supplies that have either inadequate pres-
sure or where the supply may be intermittent.
• Situations where it is not possible to safely pipe
away any discharge from the safety valves.
• In areas where the water consistently contains a
high proportion of solids, e.g. suspended matter that
could block the strainer, unless adequate ltration can
be ensured.
Table 3: Standing heat losses
Table 2: Unit weights
Based on an ambient air temperature of 20
o
C and a
stored water temperature of 65
o
C
Type Model
reference
Nominal
capacity
(litres)
W eight of
unit full
(kg)
DIRECT PP100E 100 123
PP120E 120 145
PP150E 150 178
PP170E 170 199
PP210E 210 246
PP250E 250 295
PP300E 300 355
INDIRECT PP100B 100 125
PP120B 120 147
PP150B 150 181
PP170B 170 203
PP210B 210 251
PP250B 250 300
PP300B 300 360
Nom ina l
capacity per day per yea r
(litres) (kW h/24h) (kW h/365d)
100 1.14 416.1
120 1.25 456.3
150 1.45 529.3
170 1.63
595.0
210 1.91 697.2
250 2.22 810.3
300 2.52 919.8
Standing Hea t Loss