Santon AH7/2.2 Guide

1
Installation and User Instructions
Aquaheat Unvented Water Heaters
Models: AH7/2.2, AH10/2.2, AH15/2.2
Please read and understand these instructions before starting work.
Please leave this leaet with the user following installation
PACK CONTENTS
Heater, Pressure relief valve, Fixing screws and plugs,
Installation and User Instructions.
WARNING
This water heater must only be installed by qualied persons.
36005791 Issue 3.

2
Please read and understand these instructions prior to installing your Aquaheat un-
vented water heater. Particular attention should be paid to the section headed IM-
PORTANT INSTALLATION POINTS. Following installation and commissioning
the operation of the heater should be explained to the customer and these instructions
left with them for future reference.
TECHNICAL SPECIFICATION
Electrical rating ....................................................2.0kW @ 230V
.............................................................................. 2.2kW @ 240V
Capacities .............................................................7, 10 or 15 litres
Weight (full) .........................................................7 litre - 11.9 kg
...............................................................................10 litre - 15.9 kg
...............................................................................15 litre - 25.0 kg
Rated pressure ......................................................6 bar (0.6 MPa)
Minimum recommended supply pressure ............0.8 bar (0.08 MPa)
Pressure Relief Valve ...........................................6 bar (0.6 MPa)
Name Aquaheat
Model identier 7l
(2.2kW)
10l
(2.2kW)
15l
(2.2kW)
Storage volume V (litres) 7.0 10.0 15.0
Mixed water @ 40°C V40 (l) 13 17 25
Load Prole XXS XXS XXS
Energy Efciency Class C C C
Energy Efciency % 31.3 30.6 30.8
Annual electricity consumption kWh 589 603 599
Daily fuel consumption kWh 2.860 2.940 2.920
Thermostat setting 60°C
Specic precautions that shall be taken when the
water heater is assembled, installed or maintained
and disposed of at end of life. See sections 1 to 9
Table: Technical parameters in accordance with European Commision
regulations 814/2013 and 812/2013
The HWA Charter Statement requires that all members adhere to the following:
• To supply t for purpose products clearly and honestly described.
• To supply products that meet, or exceed appropriate standards and building and
water regulations.
• To provide pre and post sales technical support.
• To provide clear and concise warranty details to customers.

3
1.0 IMPORTANT INSTALLATION POINTS
1.1 The Aquaheat unvented water heater MUST be tted with a Pressure (Expansion)
Relief Valve. This MUST be tted to the cold water supply near the heater.
FAILURE TO PROVIDE ADEQUATE PRESSURE RELIEF WILL
INVALIDATE ANY GUARANTEE AND LEAD TO A DANGEROUS
INSTALLATION
1.2 Expansion can take place within the cold water supply PROVIDED THAT
BOTH :
(a) Backow in the main is not prevented by any stopvalve with loose jumper,
check valve, pressure reducing valve or similar, AND
(b) Hot water expansion does not enter a branch to a cold water outlet
(see Figure 1 for expansion pipe lengths).
N.B. Both the above conditions must be met. Additionally expansion within
the cold water supply will not be possible if the static supply pressure exceeds
4.1 bar (60p.s.i.).
1.3 If any of the conditions in 1.2 above cannot be met expansion must be accomodat-
ed using an Expansion Vessel. To ensure all expansion takes place in the vessel a
Non Rerturn Valve must also be tted together with a Pressure (Expansion) Relief
Valve (see Figure 2). Use Accessory Pack ALK05 (94970012).
1.4 If the static supply pressure exceeds 4.1 bar (60p.s.i.) a Pressure Reducing Valve
must be tted to the cold main supply. If a Pressure Reducing Valve is used an
Expansion Vessel must also be used (see Figure 3). Use Accesories Pack ALK04
(94970011).
1.5 Where specications demand the tting of a Temperature/Pressure Relief Valve,
one can be tted on site (see Figure 4). Use Accesory Pack ALK06 (94970013).
Note the tting of ALK06 does not alter the requirements detailed in points 1.1 to
1.4 above.
WARNING: IF WATER FLOWS FROM THE PRESSURE RELIEF VALVE
OR TEMPERATURE / PRESSURE RELIEF VALVE (IF FITTED) THE ELEC-
TRICITY SUPPLY MUST BE SWITCHED OFF IMMEDIATELY. CONTACT
THE SANTON SERVICE TEAM (TEL: [phone]) OR AN APPROVED
INSTALLER.
3

4
HOT
T &P V A LV E
C OL D
T O D R AIN
(WAS T E )
FIGURE 4: TEMPERATURE AND PRESSURE RELIEF VALVE.
�NOTE: THE FITTING OF ALKO6 (94970013) DOES NOT
�ALTER THE REQUIREMENTS OF POINTS 1.1 TO 1.4
T O DR AIN
(WAS T E )
C O NNE C T ION T O
OUT LE T P IP E O F
AQUAHE AT WATE R
HE AT E R .
HO T W AT E R
OUT LE T P IP E W OR K
C ONNE C T ION
DE T A IL O F T E MP E R AT UR E
AND P R E S S UR E R E LIE F V AL V E
P R O B E
HOT COLD
NEAREST COLD
DRAW OFF
SERVICE
VALVE COLD
WATER
MAINS
2.0 (7L), 2.8 (10L) OR 4.2 (15L) METRES IS 
REQUIRED FOR EXPANSION IN PIPEWORK.

FIGURE 1 : FOR INLET WATER PRESSURES UP TO 4.1 BAR (60 P.
S.I.) - NO ADDITIONAL KITS USED.
COLD
EXPANSION
VESSEL
NON-RETURN
VALVE
NEAREST COLD
DRAW OFF
SERVICE
VALVE COLD
WATER
MAINS

FIGURE 2 : FOR INLET WATER PRESSURES UP TO 4.1 BAR (60 P.S.I.) 
 WHERE EXPANSION IN MAIN SUPPLY IS NOT POSSIBLE - USING KIT ALK05 (94970012)
HOT
TO DRAIN
(WASTE)
PRESSURE
(EXPANSION)
RELIEF VALVE
TO DRAIN
(WASTE)
PRESSURE
(EXPANSION)
RELIEF VALVE
AH07/2.2
AH10/2.2
AH15/2.2
AH07/2.2
AH10/2.2
AH15/2.2


5
2.0 INSTALLATION - GENERAL REQUIREMENTS
2.1 National Wiring rules may contain restrictions concerning the installation of these
units in bathrooms.
2.2 The unit should be vertically wall mounted using the screws and plugs provided.
Position the bottom two screws as shown in Figure 5 with heads 3mm from the
wall. Hang the Heater and secure with the top screw.
Alternatively it can be oor mounted on it’s base. The water connections must
always be to the top of the unit.
2.3 Enough space should be left at the top above the unit for pipe connections and
access to the Temperature/Pressure Relief Valve (if tted). Refer to Figure 5 and
the Dimensions Table to determine a suitable position for the heater.
2.4 NOTE: Ensure that the wall can support the full weight of the unit
(see TECHNICAL SPECIFICATIONS) and that there are no hidden services
(electricity, gas, or water) below the surface of the wall.
2.5 DO NOT install where the unit may freeze.
2.6 Refer to the section IMPORTANT INSTALLATION POINTS to determine which
valves and accessories are required. Plumb in the valves in the sequence shown in
the relevant Diagrams ( Figures 1, 2, and 3).
2.7 Both inlet and outlet pipes are clearly labeled. The pipes are 15mm copper tube
and are suitable for compression ttings.
It is recommended that a WRAS listed isolating valve (not supplied) is tted on
the cold water supply to the heater. Several hot outlets can be served.
2.8 Do not use solder joints as this will damage the heater and may prevent servicing
under warranty.
2.9 Plumbers Paste must not be used as it can impair the operation of the valves.
5
E
G
I
H
F
A
B
C D
2 KEYHOLE
FIXING SLOTS
6mm WIDE
DIMENSION 7 LITRE 10 LITRE 15 LITRE
A 356mm 442mm 417mm
D 406mm 492mm 467mm
B 251mm 337mm 312mm
C 349mm 435mm 410mm
E 240mm 240mm 330mm
F 100mm 100mm 100mm
G 120mm 120mm 170mm
H 240mm 240mm 330mm
I 57mm 57mm 102mm
FIGURE 5: DIMENSIONS
FIXING HOLE

6
ELEMENTNEON
RESET BUTTON
EARTH
POST
('STAT/CUT-OUT PLUGS DIRECTLY 
ONTO ELEMENT TERMINATIONS).
DOUBLE POLE
ISOLATING SWITCH
BROWN
BLUE
GREEN/YELLOW


MAINS 
SUPPLY


L

N
FIGURE 6: WIRING DIAGRAM 'AC' ONLY.
IMPORTANT: THE COMBINED THERMOSTAT/CUT-OUT MUST BE PUSHED FULLY
HOME TO ENSURE CORRECT OPERATION OF THE CUT-OUT
COMBINED
THERMOSTAT
& CUT-OUT
THERMOSTAT
POCKET
ELEMENT
TERMINALS
FLARED END OF
THERMOSTAT
POCKET
CORRECT INCORRECT
3.0 INSTALLATION - ELECTRICAL REQUIREMENTS
WARNING: This appliance must be earthed. It is suitable for a.c. supply only.
Disconnect the electrical supply before removing the terminal cover. Installation
must be in accordance with the current I.E.E. Wiring Regulations.
3.1 The unit is supplied tted with a 0.75m 3 core 1.5mm2 exible cable. The electic-
ity supply should be fused 13 Amp and be via a double pole isolating switch with
a contact separation of at least 3mm in both poles. Refer to the schematic wiring
diagram on page.
3.2 The wires are colour coded as follows:
Green and Yellow EARTH ( )
Brown LIVE (L)
Blue NEUTRAL (N)

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4.0 INSTALLATION - DISCHARGE PIPE REQUIREMENTS
4.1 The discharge outlet from the Pressure (Expansion) Relief Valve and the
Temperature/Pressure Relief Valve (if tted) must be connected to a discharge
pipe. It is recommended that a tundish (not supplied) be installed in the discharge
pipe to give a visible indication that the valves are operating.
4.2 The discharge pipe must fall continuously from the valve outlets and be
unobstructed.
4.3 The pipe from the valves to the tundish should be 15mm o/dia minimum. From
the tundish to the point of discharge the pipe should be 22mm o/dia minimum and
have a resistance to ow equivalent to 9 metres of straight pipe. Long discharge
pipe runs should have an increased internal diameter.
4.4 The pipe material should be capable of conveying water/steam at 100oC.
4.5 The nal discharge point should be in a safe, visible position.
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5.0 COMMISSIONING
5.1 Do not switch on the electrical supply until the unit has been lled with water and
checked for leaks.
5.2 Check that all installation, electrical and discharge pipe requirements have been
met.
5.3 Check that all water and electrical connections are tight.
5.4 Open a hot water tap, turn on mains water supply to the heater.
5.5 Allow unit to ll and leave hot tap running for a short while to purge any air and
ush out the pipework. Close the hot tap and check the system for leaks.
5.6 Manually test the operation of the Pressure (Expansion) Relief Valve and, if
tted, the Temperature/Pressure Relief Valve. Ensure water ows freely from the
valve(s) and through the discharge pipes.
5.7 Switch on the electrical supply. The indicator light will illuminate during heating.
When the set temperature is reached the indicator light will go out.
5.8 The set temperature can be adjusted by rotating the shaft located on the Combined
Thermostat and Thermal Cut-out, clockwise increases the temperature. Access to
adjust the temperature is gained by removing the terminal cover
.
6.0 REMOVAL AND FITTING OF TERMINAL COVER
6.1 To remove the terminal cover use a large at bladed screwdriver to relieve the
snaps located towards the front at either side of the cover. Gripping the cover at
the front, pull upwards.
6.2 To t the cover, locate the hinge at the back. Slide the snaps into place. Apply
pressure to the front of the cover pushing back and down until it snaps securely
in place.

8
INLET
OUTLET

CABLE CLAMP
EARTH POST
COMBINED THERMOSTAT 
AND THERMAL CUT-OUT
FIGURE 7: CORRECT ORIENTATION OF ELEMENT PLATE ( VIEWED FROM TOP OF UNIT ).
7.0 MAINTENANCE - DESCALING
Little maintenance is required, however in hard water areas the unit will require peri-
odic descaling to ensure efcient operation. To descale the unit:
7.1 Switch off and disconnect the electrical supply. Turn off the water supply to the
unit.
7.2 Open a hot tap to relieve any system pressure. Disconnect the plumbing
connections to the unit and remove (note full weights of units). Empty unit
through the outlet connection.
7.3 Remove the terminal cover as described in Section Six.
7.4 Disconnect the electrical terminations to the thermostat. Disconnect earth links to
the earthing stud.
7.5 Remove the element plate assembly by unscrewing the ve securing screws,
tapped jacking points are provided. Remove any loose scale from the container.
Carefully clean off any scale from the element and thermostat pocket. DO NOT
clean scale from interior container walls.
7.6 Re-t the element plate assembly using a new sealing gasket. Note the correct
orientation of the element plate by reference to Figure 7 overleaf. Rewire the unit
with reference to the Wiring Diagrams.
7.7 Re-commission the unit following the INSTALLATION and COMMISSIONING
instructions.

9
10.0 SPARE PARTS
The following comprehensive list of spare parts is available for your Santon water
heater. Please refer to the Rating Label on the side of your heater before ordering to
ensure the correct spare part is obtained.
DO NOT REPLACE WITH PARTS NOT RECOMMENDED BY SANTON -
THIS WILL INVALIDATE YOUR GUARANTEE AND MAY RENDER THE
INSTALLATION DANGEROUS.
DESCRIPTION CODE NO.
Element plate assembly - 7 litre 2.2kW................95 606 939
Element plate assembly - 10 litre 2.2kW..............95 606 940
Element plate assembly - 15 litre 2.2kW..............95 606 950
Combined thermostat/thermal cut-out .................95 612 687
Indicator light .......................................................95 607 992
Element plate gasket .............................................95 611 708
Pressure (Expansion) Relief Valve........................95 607 986
Temperature/Pressure Relief Valve.......................95 605 854
Top cover moulding (7&10 litre)..........................95 614 272
Top cover moulding (15 litre) ...............................95 614 276
Terminal cover (7&10 litre) .................................95 614 274
Terminal cover (15 litre) .......................................95 614 275
8.0 MAINTENANCE - SAFETY VALVES
The Pressure (Expansion) Relief Valve and, if tted, the Temperature/Pressure Relief
Valve should be regularly checked. Manually operate the valves by either twisting the
cap or lifting the lever. Ensure water ows freely from the valve(s) and through the
discharge pipes. Ensure the valve(s) reseat correctly when released.
9.0 MAINTENANCE - EXPANSION VESSEL PRECHARGE PRESSURE
The Expansion Vessel, if tted, should have a precharge pressure of 4.1 bar (60 p.s.i.).
This can reduce over time and eventually require re-charging. To do this:
9.1 Turn off water supply to the unit; open a hot tap to relieve system pressure.
9.2 Remove dust cap from top of Expansion Vessel
9.3 Check pre-charge pressure using a tyre pressure gauge. If the pressure is lower
than 4.1 bar (60 p.s.i.) it should be recharged using a tyre pump (Schraeder Valve
type). DO NOT OVER CHARGE.
9.4 Re-check pressure and when correct replace dust cap.
9.5 Turn on mains water supply and close hot tap.
9

10
11.0 FAULT FINDING
Disconnect the electrical supply before removing the terminal cover. It is recommend-
ed that any service operations on this Santon heater are carried out by a competent
person.
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.
ACTIONPOSSIBLE CAUSESFAULT
1. Check electrical supply1. Electrical supply faultWater not heating
2. Check cut-out, if operated reset and
check thermostat operation. If necessary
replace thermostat/thermal cut-out (see
Wiring Diagram)
2. Thermal cut-out tripped
3. Check thermostat operation, replace if
necessary
3. Thermostat fault
Fit Pressure Reducing Valve Pack
ALK04 (94970011) see IMPORTANT
INSTALLATION POINTS
pressure
Excessive mains water
pressure
(continuously)
Pressure Relief Valve
Discharge of water from
possible
(intermittently)
Presure Relief Valve
Discharge of water from 1. Fit pack ALK05 (94970012)
see IMPORTANT INSTALLATION
POINTS
2. Fit pack ALK04 (94970011) see
IMPORTANT INSTALLATION POINTS
3. Replace Pressure Relief Valve.
4. Check and if necessary, re-charge
Expansion Vessel pre-charge pressure
(see Section 9.0)
1. Expansion in mains not
possible.
2. Mains pressure exceeds
4.1 bar (60 p.s.i.)
3. Pressure Relief Valve Fault
4.Loss of pressure from
Expansion Vessel
Thermostat and
thermal cut-out fault
Replace thermostat and thermal cut-out
Pressure Relief Valve
water/steam from
Relief Valve and or
Temperature/Pressure
Discharge of water from
1. Check all valves are correctly installed
in accordance with flow direction arrows
1. Inlet valves incorrectly
fitted
No water flow
2. Check mains water supply is on
2. Mains water supply not
turned on
3. Check for obstructions. If pack ALK04
(94970011) is fitted check strainer is not
blocked.
3. Blockage in mains water
supply
Water from a pressurised system releases
oxygen bubbles when flowing. The
milkiness will disappear after a short
time.
Oxygenated water
"Milky" water

11
12.0 ACCESSORIES
The heater can be used to supply several hot water outlets via conventional taps.
It is not recommended for supplying a shower. Individual site demands should be
considered when choosing capacity and the number of outlets to be served.
A Thermostatic Mixing Valve can be used in conjunction with this unit. Accessory
Pack ALK03 (94970010) is recommended. Follow the installation instructions sup-
plied with the valve for connection to the system.
13.0 USER INSTRUCTIONS
13.1 This Santon unvented water heater stores water at the temperature set on the
adjustable thermostat. This can be set to give temperatures in the range of 6o
C to 66oC. To avoid any risk of freezing when the heater is not in use for long
periods during the winter months, do not switch off the electrical supply and set
the thermostat to its minimum position. N.B. This will not protect other system
pipework.
13.2 The indicator light will be illuminated when the unit is heating.
13.3 To ensure the heater continues to operate at its optimum performance it should
be periodically maintained in accordance with the instructions given under the
Sections headed MAINTENANCE.
13.4 IMPORTANT NOTES TO USER
 Donotblockorrestrictthedischargefromanysafetyvalvetted.
 Donottamperwithanysafetyvalvetted.
 Ifwaterdischargesfromanysafetyvalvetted,switchofftheelectrical
supplytotheunitimmediately.Contactaqualiedinstaller.Donotturnthe
electrical supply on again until the unit has been checked and approved by a
qualiedinstaller.
11

12
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 tted correctly.
2. Any valves and controls are of the Santon recommended type and specication.
3. The unit has not been modied 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 inner container with integral
immersion heater is not guaranteed against excessive 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 specications without notice.
ENVIRONMENTAL INFORMATION
Hurricane Way,
Norwich,
Norfolk, NR6 6EA.
www.santon.co.uk
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 benets.
Insulation is by means of CFC-free polyurethane foam.
AFTER SALES SERVICE
t| 0344 8711530
e| customer[email protected]