Santon R25 Guide

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Installation and User Instructions
Rectangular Combination Water Heaters
Models: R25, R45, R70, R115
PACK CONTENTS
Heater, Float Valve & Arm, Float, Overflow Fitting, Dip Tube, Screened
Breat er, Wall Mounting Collars & Installation and User Instructions.
WARNING
T is water eater must only be installed by qualified persons.
SY0019200 Revision 6.
Please read and understand t ese instructions before starting work.
Please leave t is leaflet wit t e user following installation.

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The R Series units are designed to supply hot water for handwashing, dishwashing
and general purposes to cloakrooms, canteens and kitchen areas. Containing an
integral cold water cistern, they are ideal for installations where the cold feed is from
the mains supply but an unvented situation is impractical.
Please read and understand these instructions prior to installing your R Series vented
water heater. Particular attention should be paid to the section headed IMPORTANT
INSTALLATION POINTS. Following installation and commissioning the operation of
the heater should be e plained to the customer and these instructions left with them for
future reference.
Electrical rating -
2.8 kW @ 230V
3.0 kW @ 240V
Maximum inlet pressure
1 MPa (10 bar)(145psi)
INTRODUCTION
TECHNICAL SPECIFICATION
Table 1
A
BC
D
E
ledoM
)sertil(seiticapaC)mm(snoisnemiD)gk(sthgieW
knaTtoH nretsiC
knaT ABCDE ytpmElluF
5R55.408854517030865154
54R54864801609014746147
07R0785501016090146585301
511R5118110101654401471803351

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1.0 IMPORTANT INSTALLATION POINTS
1.1 Ensure that the wall or supporting structure is of adequate strength to support the
heater. (Refer to table 1.)
1.2 The Water Regulations require a minimum of 350 mm unobstructed space above
the heater lid to allow the float valve to be replaced. However, a space of 200 mm is
sufficient to replace the R Series float valve.
1.3 The base of the heater MUST be level with, or higher than, the highest draw off
point. (Refer to figure1)
1.4 To meet the requirements of the Water Supply (Water Fittings) Regulations 1999,
Water Byelaws 2000 Scotland and the Water Regulations Northern Ireland:
1. A servicing valve shall be installed on the inlet pipe adjacent to the storage
cistern. Schedule 2 - Section 16(2).
2 . A servicing valve shall be installed on the outlet pipe.
Schedule 2 - Section 16(3).
2.0 INSTALLATION - GENERAL REQUIREMENTS
DRAIN HOT
OUTLET
OVERFLOW
MAINS COLD FEED
NBTHE HEATER MUST BE LEVEL WITH OR
HIGHERTHANTHE HIGHEST OUTLET
FIG : 1 TYPICAL INSTALLATION
SERVICING
VALVES

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2.1 Decide on the best position for the heater taking account of paragraphs 1.2 and 1.3
and inlet and outlet connections. The float valve and overflow assembly can be fitted
on either side of the heater.
2.2 Using the template provided mark the position of the top two fi ing holes. Before
drilling the wall ensure there are no hidden services such as water, gas or electrical
cables embedded in the area of the wall to be drilled.
2.3 10mm wall fixings are recommen e
These are not supplied
Drill the wall and insert the two top wall
fi ings. Assemble the spacing collars as
shown in figure 2. Locate the heater onto
the spacing collars and mark the bottom
fi ing holes. Remove the heater, drill the
wall and fit the bottom wall fi ings.
2.4 Fit the float valve complete with float, to the cistern tank.The float valve is fitted
with a white seating which is suitable for inlet pressures from 1bar to 10 bar. If the
pressure is below 1 bar the seating must be swapped with the red seating attached to
the float valve arm. Access to the seating is obtained by undoing the small plastic
nut. (Refer to figure 3.)
RUBBERWASHER
ADJUSTING SCREW
WITH LOCKING NUT
CISTERNTANKOUTER CASING
NYLON SPACER LOW PRESSURE SEAT
FLOAT AR
M
SMALL PLASTIC NUT
FIG 3 : FLOAT VALVE - FITTING
S
ECURING NUT
WALL
W
ALL FIXING BOLT
WASHER
SPACING COLLAR
FIG 2 : HEATER FIXING DETAILS

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2.6 Make the electrical connection to the heater and set the controls. Do not switch on.
See section 3.
2.7 Fit a straight 3/4 BSP female to 22mm compression fitting to the 3/4 BSP outlet
boss.
2.8 Locate the heater onto the top fi ing collars. Fit the two bottom fi ings and tighten.
2.9 Connect the heater outlet to the services. Ensure the outlet fitting is supported
during assembly to prevent unnecessary stress on the tank. When plumbing ensure
that connecting pipework leaves adequate clearance for the removal of the immersion
heater. Fit an isolating valve close to the heater outlet. This enables terminal fittings to
be changed without draining the heater down.
2.10 Connect the mains water supply to the float operated valve using 15mm o/d pipe.
NB the float valve connection is a flat face with a 1/2 BSP male thread. Fit a female
1/2 BSP to 15mm copper tap coupling to the float valve. A servicing valve must be
fitted in the 15mm supply pipe close to the cistern to enable the unit to be isolated for
servicing.
2.11 Connect the overflow pipe. The connection for the overflow pipe is 22 mm
compression for a 22mm o/d pipe. The overflow pipe must be laid in a continuous fall
and end in a safe, visible position.
2.12 Fit the washer to the screened breather, insert the screened breather into the hole
in the lid and secure with the plastic nut on the underside of the lid.
2.5 Fit the overflow fitting complete with dip tube. (Refer to figure 4.) Fit the blanking
plugs in the unused holes.
OVERFLOW ASSEMBL
Y
NYLON SPACER
OUTER CASE
CISTERN
TANK
RUBBER WASHER
D
IP TUBE
FIG 4 : OVERFLOW - FITTING

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3.6 Fit the terminal cover and tighten the cable grip screws.
3.7 After fitting the heater to the wall, ensure the electrical supply is off. Connect the
supply cable to the connection point.
DO NOT SWITCH ON THE ELECTRICAL SUPPLY UNTIL WATER FLOWS
FROM THE HOT TAP.
3.3 Remove the terminal cover on the bottom of the unit by removing the four screws.
Check and adjust the thermostat and thermal cut-out. See TEMPERATURE
SETTINGS.
3.4 Strip the outer sheath of the cable and the insulation of the conductors to the
required lengths, ensuring that the outer sheath will be held in the cable grip in the
cover when the connections are made. Slacken off the the cable grip screws and
thread the cable through the grip..
3.5 Connect the brown (or red) conductor to the thermostat.(T)
Connect the blue (or black) conductor to the neutral element teminal (N)
Connect the green/yellow (or green) conductor to the stud marked .
3.0 INSTALLATION - ELECTRICAL REQUIREMENTS
WARNING: This appliance must be earthed.
It is suitable for 230/240V a.c. supply only.
Installation must be in accor ance with BS 78671, Requirements for Electrical
Installations (I.E.E. Wiring Regulations.)
3.1 The electrical supply should be fused at 13 A and be via a readily accessible
double pole isolating switch with a contact separation of at least 3mm in both
poles.
3.2 The connection between the heater and the connection point should be made with
heat resisting (85°C) cable with a minimum cross sectional area of 1.5 mm2
3.3 Remove the terminal cover on the bottom of the unit by removing the four screws.
Check and adjust the thermostat and thermal cut-out. See TEMPERATURE
SETTINGS.
3.4 Strip the outer sheath of the cable and the insulation of the conductors to the
required lengths, ensuring that the outer sheath will be held in the cable grip in the
cover when the connections are made. Slacken off the the cable grip screws and
thread the cable through the grip..
Refer to
figure 5

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Control Thermostat :
The heater is fitted with an adjustable Cotherm TSD 01105 rod type
thermostat. This does not have a calibrated scale. The minimum setting
(appro imately18°C) is indicated by - and the ma imum settting (appro imately 70°C)
by +. It is recommended that the thermostat is set by turning to the ma imum setting,
and then turning back by an angle of 45° (one eighth of a turn).
Settings above 60°C are not recommended.
Thermal Cut-out
The heater is fitted with a manually re-settable thermal cut-out which will interupt the
power to the element in the event of overheating . In the event of the thermal cut-out
operating it is re-set by pressing the re-set button (refer to figure 5) after checking the
thermostat. See section 8.
The thermal cut-out has a calibrated scale and should be set 15°C above the control
thermostat setting, but not above 85°C.
iiiiiiiiiii
4.0 TEMPERATURE SETTINGS
N
E
THERMAL
CUT-OUT
CONTROL
THERMOSTAT
FIG 5 : ELECTRICAL CONNECTIONS
RE-SET BUTTO
N
L
N

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5.4 Open the isolating valve on the inlet. Open a hot water tap on the outlet, turn on
mains water supply to the heater.
5.5 Allow unit to fill and run the hot tap for a short while to purge any air and flush
out the pipework. Close the hot tap.
5.6 When the float valve has shut off check the level of water in the cistern tank and
adjust as necessary.
5.7 Check the installation for leaks.
5.8 Fit the lid and secure with the four screws provided.
5.9 Turn on the electrical supply.
5.1 Do not switch on the electrical supply until the unit has been fille with water an
checke for leaks.
5.2 Ensure the isolating valve on the outlet is open and that all the taps connected to
the outlet are closed.
5.3 Check the cold feed and vent pipe are free from obstruction. (Refer to figure 6).
5.0 COMMISSIONING
WATER LEVEL
VENT PIPE
COLD FEED
FIG 6 : INSIDE CISTERN TANK
)sertil(yticapaC55407511
emitpUtaeH
)setunim( 030508531
Table 2 - Approximate heat up times with an inlet temperature of 10°C and a
thermostat setting of 60°C.

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6.1 Isolate the unit from the electrical supply.
6.2 Check the water temperature from a hot tap, and run until cold.
6.3 Turn off the water supply to the unit at the servicing valve.
6.4 Drain the unit by opening a outlet hot tap and removing the drain nut on the
underside. Take care as the water from the drain pipe may be very hot.
6.5 Slacken off the cable grip screws in the terminal cover; remove the four fi ing screws
and remove the terminal cover.
6.6 Disconnect the supply cable from the heating element and unscrew the immersion
heater.
6.7 Check the settings of the thermostat and thermal cut-out on the new immersion heater.
6.8 Re-assemble in reverse order, taking care to use the new gasket but do not fit the
terminal cover.
6.9 Refit the drain nut and turn on the water. Check for leaks.
6.10 Refit the terminal cover.
6.11 When water runs from the hot tap, close the tap and turn on the electrical supply.
6.0 MAINTENANCE - HEATING ELEMENT REPLACEMENT

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NOTE: Use only Santon approved spare parts. Replacement of any parts with
components not recommended by Santon will invalidate the guarantee and may render
the installation dangerous.
7.0 SPARE PARTS
The following spare parts are available for your Santon water heater. Please refer to the
Rating Label on the bottom of your heater before ordering to ensure the correct spare
part is obtained.
IMPORTANT NOTE
On all heaters installed outside the UK it is essential to quote all the model details on
the rating label especially voltage and kW rating.
DO NOT REPLACE WITH PARTS NOT RECOMMENDED BY SANTON -
THIS WILL INVALIDATE YOUR GUARANTEE AND MAY RENDER THE
INSTALLATION DANGEROUS.
ESCRIPTION CO E NO.
Immersion heater .................................................. EY311E
Gasket .................................................................. S278
Thermal cut-out .................................................... S687
Feed Pan Cover 25 litre ........................................ S3408
Feed Pan Cover 45 litre & 70 litre ......................... S3409
Feed Pan Cover 115 litre ....................................... S3411
Bylaw 30 Kit ......................................................... S3412
Float Valve Assembly ........................................... S5512
Control Thermostat .............................................. 95980025

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Disconnect the electrical supply before removing the terminal cover. It is recommended
that any service operations on this Santon heater are carried out by a competent
person.
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8.0 FAULT FINDING
.
ACTIONPOSSIBLE CAUSESFAULT
1. Check switches closed.
2. Check fuses/MCB. If blown/tripped
identify cause and and rectify before
replacing/re-setting.
3. Check supply cord not damaged.
1. Electrical supply fault.Water not heating
2. Check cut-out. If operated, reset and
check thermostat for failure in the
closed position or too high a setting. See
section 3.0
If necessary replace thermostat/thermal
cut-out .
2. Thermal cut-out tripped.
4. Check thermostat for failure open
circuit, replace if necessary.
4. Thermostat faulty
- open circuit.
Water too hot 1. Check thermostat setting.
1. Thermostat set too high.
3. Element failure. 3. Replace element. See section 6

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GUARANTEE
This product is guaranteed against faulty materials and manufacture for a period of 2
years from the date of purchase provided that:
1. The unit has been installed in accordance with the Installation and User Instructions
and all relevant Codes of Practice and Regulations in force at the time of installation,
and that all necessary controls and safety valves have been fitted correctly.
2. Any valves and controls are of the Santon recommended type and specification.
3. The unit has not been modified or tampered with in any way, and has been regularly
maintained as detailed in the Installation and User Instructions.
4. The unit has been used only for heating potable water.
The unit is not guaranteed against damage by frost, and the immersion heater is not
guaranteed against e cessive scale build-up.
This Guarantee in no way affects the statutory rights of the consumer.
The policy of Santon is one of continuous product development and, as such, we reserve
the right to change specifications without notice.
ENVIRONMENTAL INFORMATION
Sales Tel: [phone]
Sales Fa : [phone]
Hurricane Way, Sales Email: [email protected]
Norwich, Service Tel: [phone]
Norfolk, NR6 6EA. Service Fa : [phone]
www.santon.co.uk Service Email: [email protected]
A member of Baxi Group Ltd.
Santon products are manufactured from many recyclable materials.
At the end of their useful life they should be disposed of at a Local Authority Recycling
Centre in order to realise the full environmental benefits.
Insulation is by means of CFC-free polyurethane foam.