qSpa & qSpa Solar
Installation and Servicing Instructions
When replacing any part on this appliance, use only spare parts that you can be
assured conform to the safety and performance specification that we require.
Do not use reconditioned or copy parts that have not been clearly authorised by Keston.
For the very latest copy of literature for specification and maintenance practices visit our website
www.keston.co.uk where you can download the relevant information in PDF format.
ISSUE 06: MAY 2017
These instructions should be read in conjunction with the installation/servicing
instructions issued by the manufacturer of the heat source being used.
Any installation must be in accordance with the relevant requirements of the Gas
Safety Regulations, Building Regulations, I.E.E. Wiring Regulations and the Water Fitting
Regulations (England and Wales) or Water Byelaws (Scotland). It should be read in
accordance with the relevant recommendations of the following:
BS 6798; BS EN 12828, BS EN 12831, BS EN 14336; BS 5546;
BS 5440:1; BS 5440:2; CP 331:3
BS EN 806-1 to 5, BS EN 8558:2011: BS EN 1458-1:2011 and BS 7593:2006
qSpa is covered by Section G3 of the Building Regulations (England and Wales)
Technical Standard P3 (Scotland) and Building Regulation P5 (Northern Ireland).
Compliance can be achieved via a Competent Person Self Certication Scheme or
noticaton of installation to the Local Authority Building Control Department.
It must be installed by a competent person as dened by the relevant regulations.
Manufacturers notes must NOT be taken as over-riding statutory obligations.
This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge unless
they have been given supervision or instruction concerning use of the appliance by
a person responsible for their safety. Children should be supervised at all times to
ensure they do not play with the appliance.
This information is provided to assist generally in the selection of equipment.
Responsibility for selection and specication of our equipment must however remain
that of our customer and any experts or consultants concerned with the installation(s).
ISSUE 06: MAY 2017
Section Page
DESIGN
Description 3
Technical Information 6
System Design 8
INSTALLATION
Installation 10
Commissioning 20
SERVICING AND MAINTENANCE
Servicing and Maintenance 21
Fault Finding 22
Short Parts List 25
APPENDIX
Appendix 26
Terms & Conditions 27
Notes 28
Please note: that we do not therefore accept any responsibility for matters of
design selection or specication, for the eectiveness of an installation or system
containing one of our products unless specically requested to do so in writing.
All goods are sold subject to our Conditions of Sale which are set out at the rear of this
specication. In the interest of continuously improving the qSpa range, Keston Heating
reserve the right to modify the product without notice, and in these circumstances
this booklet, which is accurate at the time of printing, should be disregarded. An
updated set of Instructions will be produced and supplied with new appliances and
will be made available for other appliances on request.
qSpa is produced under an ISO 9001:2008 Quality Management System approved
by BSI.
Benchmark places responsibilities on both manufacturers and installers. The purpose is to
ensure that customers are provided with the correct equipment for their needs, that it is
installed, commissioned and serviced in accordance with the manufacturers instructions
by competent persons and that it meets the requirements of the appropriate Building
Regulations. The Benchmark Checklist can be used to demonstrate compliance with
Building Regulations and should be provided to the customer for future reference.
Benchmark Checklist 30
Benchmark Service Record 31
Page 2
DESIGN
Manufacturer: Keston Heating
Maximum inlet pressure to
Pressure reducing valve 12 bar
Operating pressure (PRV setting) 3 bar
Expansion vessel charge pressure 3 bar
Expansion relief valve setting 4.5 bar
Opening pressure of P & T Relief Valve 6 bar
Opening temperature of P & T Relief Valve 89-96°C
Energy cut-out thermostat setting 85°C
Max. working pressure - Primary heat exchanger (Indirect models) 6 bar
Max. working pressure - Solar heat exchanger (Solar models) 10 bar
Immersion heater rating 3kW, 240V AC
All cylinders are manufactured in accordance with the requirements of BS EN 12897
The tundish must be positioned so that it is visible to the occupant and is away from
electrical devices.
Components supplied with qSpa:
• Cold water inlet PRV combination valve/expansion relief
• Pressure and temperature relief valve
• Control thermostat
• Energy cut-out thermostat
• Energy cut-out motorised valve (indirects only)
• Tundish
• 3kW Immersion heater including control and cut out thermostats
• Expansion vessel/mounting bracket/exible hose
• Technical/user product literature
(Note: Please refer to table on pages 6-7 to conrm the quantity of immersion heaters
supplied with the unit)
In any situation where the volume of heated pipework (eg. secondary circulation
pipes or manifold pipework for multiple units) exceeds 10 litres, then an
additional expansion vessel must be tted to accommodate the extra expansion
volume.
Handling Before Installation
qSpa must be handled with care and stored the correct way up in a dry place. Any
manual handling/lifting operations will need to comply with the requirements of
the Manual Handling Operations Regulations issued by the H.S.E. The appliance can
be moved using a sack truck on the rear face although care should be taken and the
route should be even. In apartment buildings containing a number of storeys we would
recommend that the appliances are moved vertically in a mechanical lift. If it is proposed
to use a crane, expert advice should be obtained regarding the need for slings, lifting
beams etc.
A specic manual handling assessment is shown in Appendix at the rear of this manual.
Maintenance
Modifications should not be made to this
product. Replacement parts, including
immersion heaters, should be purchased from
Keston Heating, or agents approved by them.
Unvented hot water storage vessels need
regular routine checks, and these are detailed
below. It is for this reason that this manual must
always be left with the qSpa.
It is essential that these checks be carried out
at the time of boiler maintenance by a qualied
installer:
1. Manually open the relief valves in turn, and
check that water is discharged from the
valves and runs freely through the tundish
and out at the discharge point. Ensure that
the valves re-seat satisfactorily. (Note - the
water may be very hot).
2. It is important to check that the discharge
pipework is carrying the water away
adequately. Check for blockages etc. if it is
not.
3. Turn the mains water o and remove and
clean the strainer element in the Pressure
Reducing Valve.
4. Check the charge pressure in the expansion
vessel and repressurise if required
5. Re-ll the system and ensure that all relief
valves have re-seated.
6. The Benchmark Service Record should be
updated at each service.
7. Check the water pressure downstream of the
combination valve is 3 bar in static condition.
8. Check and if necessary, descale the heat
exchanger in hard water areas ie. above
200ppm (mg/l).
Note:
The cylinder is factory tted with a temperature
& pressure relief valve that must not be used for
any other purpose or removed.
The cylinder is factory tted with immersion
heaters with thermal cut outs. Immersions
without thermal cut outs must not be tted.
The Environment
This product has been manufactured using many recyclable materials, including the
approved HCFC/CFC free polyurethane foam insulation. At the end of its useful life, it
should be disposed of at a Local Authority Recycling Centre, to maximise the products
full environmental benets.
Page 3
DESCRIPTION
DESIGN
Figure 1
qSpa is a range of indirect unvented hot water
storage cylinders, manufactured in the latest
high quality duplex stainless steel. They are
designed to provide mains pressure hot water
and are supplied as a package which complies
with Section G3 of the Building Regulations.
The appliance is extremely well insulated using
high density HCFC free foam insulation with an
ozone depleting potential (ODP) of zero and a
global warming potential (GWP) of 2. It is tted
with all necessary safety devices and supplied
with all the necessary control devices to make
installation on site as easy as possible.
qSpa is available in two basic variants:
1. qSpa Indirect - For use with gas or oil boilers
(Figure 1). Unvented cylinders must not be
used with solid fuel boilers or steam as the
energy source.
2. qSpa Indirect Solar - For providing hot
water by solar gains and gas or oil boilers
(Figure 2). Unvented cylinders must not be
used with solid fuel boilers or steam as the
energy source.
qSpa Indirect
qSpa
INDIRECT
qSpa Indirect is an unvented hot water storage
cylinder and is provided with a high eciency
internal primary coil which is designed for use
with a gas or oil boiler and is suitable for both
open vented and sealed pumped primary
systems.
When used with a sealed heating system the
boiler must incorporate its own energy cut-out
overheat thermostat.
qSpa Indirect models are listed in table on
Page 6 & 7.
DESCRIPTION
Page 4
DESIGN
Figure 2
qSpa Indirect Solar
qSpa Indirect Solar is an unvented hot water
storage cylinder and is provided with a
high eciency internal primary coil which is
designed for use with a gas or oil boiler and
is suitable for both open vented and sealed
pumped primary systems.
When used with a sealed heating system the
boiler must incorporate its own energy cut-out
overheat thermostat.
A high eciency solar coil is positioned below
the primary coil to ensure maximum benet of
solar gain energy.
qSpa Indirect Solar models are listed in table
on Page 6 & 7.
Note:
The cold supply elbow c/w drain tapping
must be tted as shown in gs 1 and 2. A
exible hose can then be connected to the
drain tapping and, providing the hose runs
below the lowest level of the cylinder, then
all the water contents can be drained out
by syphonic action. (The cold feed pipe dips
internally to the base of the cylinder.)
qSpa
INDIRECT SOLAR
Page 5
DESCRIPTION
DESIGN
Table 1
L
P
Solar Indirect
A
B
I
D
E
K
Indirect
A
C
D
F
J
B
G
E
I
C
N
J
G
M
Model
qSpa
90
120
150
180
210
250
300
400
Solar qSpa
180
210
Stock Code
KESPLUIN090 A 32 91 20 111 3 12 764 550 522 n/a 382 345 n/a 45.1 272 235 325 n/a n/a n/a n/a n/a n/a 16.5 0.59 0.165 n/a n/a 17 n/a
KESPLUIN120 B 39 119 23 142 3 12 931 550 689 n/a 437 345 n/a 63.1 327 235 325 n/a n/a n/a n/a n/a n/a 18 0.59 0.165 n/a n/a 21 n/a
KESPLUIN150 B 47 148 26 174 3 18 1118 550 876 n/a 499 385 n/a 83.2 389 235 365 n/a n/a n/a n/a n/a n/a 18.5 0.68 0.191 n/a n/a 25 n/a
KESPLUIN180 B 55 178 30 208 3 18 1306 550 1064 n/a 561 425 n/a 103.4 451 235 405 n/a n/a n/a n/a n/a n/a 19 0.78 0.216 n/a n/a 30 n/a
KESPLUIN210 B 62 208 33 241 3 24 1494 550 1252 1141 632 425 n/a 123.7 513 235 405 n/a n/a n/a n/a n/a n/a 20.5 0.78 0.216 n/a n/a 32 n/a
KESPLUIN250 C 74 248 38 286 3 24 1744 550 1502 1353 955 505 705 110.5 595 235 485 n/a n/a n/a n/a n/a n/a 21.5 0.97 0.241 n/a n/a 36 n/a
KESPLUIN300 C 86 287 43 330 3 35 1990 550 1748 1562 1092 505 786 128.5 676 235 485 n/a n/a n/a n/a n/a n/a 25 0.97 0.241 n/a n/a 38 n/a
KESPLUIN400 D 118 400 55 455 3 2 x 24 2030 630 1787 1595 1117 566 799 180 669 235 546 n/a n/a n/a n/a n/a n/a 30.5 1.27 0.31 n/a n/a 41 n/a
KESPLUIN180S B 55 178 31 209 3 18 1306 550 1064 n/a 693 385 n/a 82.2 859 879 969 235 365 451 941 220 n/a 18 0.59 0.165 0.68 0.191 28 96
KESPLUIN210S B 62 208 35 243 3 24 1494 550 1252 1141 736 385 n/a 105.5 922 922 1052 235 365 513 1064 243 n/a 18.5 0.68 0.191 0.68 0.191 35 101
Heat Loss
Energy Eciency Class
Watts Litres kg kg bar Litres A=mm mm B=mm C=mm D=mm E=mm F=mm Litres G=mm I=mm J=mm K=mm L=mm M=mm N=mm P=mm R=mm kW m
Capacity (Total Volume)
Weight - Full
Weight - Empty
Expansion Vessel size.
expansion valve set at 4.5 bar
cold supply, expansion vessel connection and
Pressure Regulator 3 bar inlet group c/w balance
Pre-charged to 3 bar
Overall Height
Overall Diameter
Pressure & Temperature
Return Tapping
22mm Secondary
Relief Valve 6bar 90°C
250
300
400
KESPLUIN250S C 74 248 40 288 3 24 1744 550 1502 1353 796 505 n/a 136 1002 982 1152 235 485 595 1252 275 n/a 19 0.78 0.216 0.97 0.241 38 107
KESPLUIN300S C 86 287 44 331 3 35 1990 550 1748 1562 922 505 n/a 155.3 1128 1108 1278 235 485 676 1128 305 n/a 20.5 0.78 0.216 0.97 0.241 41 125
KESPLUIN400S D 118 400 59 459 3 2 x 24 2030 630 1784 1592 872 557 n/a 190 1060 930 1190 238 548 651 1383 357 n/a 22 0.97 0.241 1.27 0.31 45 165
TECHNICAL INFORMATION
Page 6
DESIGN
NOTES
1. Not all models - see table 2.
2. Recovery times based on Primary
Coil/I.H. duty (ie. assumes the boiler
output is adequate).
3. All connections are supplied with
compression fittings for direct
connection to copper pipework.
4. The diagrams shown are generic.
For exact product specification
refer to the table eg. the number
5
3
°
°
5
1
5
°
1
1
°
5
°
5
,
7
of immersion heaters varies
depending on model.
5. Heat up and recovery times based
on 0.25 l/s primary ow rate and at
82°C ow temperature.
Cold Feed 22mm
Heater - High Level
On Peak Immersion
Compression Connection
Heater - Low Level
O Peak Immersion
Volume of On Peak Water
Heated
Coil
Connection
Connection
22mm Solar Flow
22mm Solar Return
Compression Connection
Dual Control & Overheat Stat
22mm Primary Return Compression
(28mm tails for 400 litre model)
22mm Primary Flow Compression
(28mm tails for 400 litre model)
Compression Connection
Solar Pocket
Solar Pocket
Heater - Low Level
Dual Control & Overheat Stat
Second O Peak Immersion
kW Rating of Primary Coil
Surface Area of
Primary Heater Coil
2
bar m2bar min Litres
Pressure Loss Across
Primary Heater Coil
Surface Area of
Solar Heater Coil
Pressure Loss Across Solar Heater
Heat Up Time from 15°C to 60°C
(applies to Primary Heat Source only)
Dedicated Solar Volume
Page 7
TECHNICAL INFORMATION
DESIGN
1
2
3
4
6
7
9
5
8
qSpa Indirect
Basic Appliance
1. Hot water draw o (22mm) compression
2. Temperature & pressure relief valve 89-96°/6
bar
3. Hot water secondary return 22mm
(not tted to smaller sizes, see table 1)
4. Immersion heater 1¾” BSP 3kW
5. 22mm cold supply compression
6. Immersion heater 1¾” BSP 3kW
7. Dual control/overheat stat pocket (22mm)
8. Primary return (22mm)
- (28mm tails for 400 litre models)
9. Primary ow (22mm)
- (28mm tails for 400 litre models)
Part G3 loose components supplied in a
separate box
A. Combination inlet group incorporating
pressure reducing valve, strainer, check
valve, balance cold take o point, expansion
relief valve and expansion vessel connection
points.
B. Potable expansion vessels c/w exible hose
and integral wall bracket
C. Tundish
D. Dual control thermostat and combined
overheat thermostat
E. Two port (22mm) zone valve for
primary circuit
F. Wiring junction box for primary system
SYSTEM DESIGN
Page 8
DESIGN
11
10
1
2
3
12
8
7
4
9
6
5
12
qSpa Indirect Solar
Basic Appliance
1. Hot water draw o (22mm) compression
2. Temperature & pressure relief valve 89-96°/6
bar
3. Hot water secondary return 22mm
(not tted to smaller sizes, see table 2)
4. Immersion heater 1¾” BSP 3kW
5. 22mm cold supply
6. Dual control/Overheat stat pocket (solar)
7. Primary return (22mm)
- (28mm tails for 400 litre models)
8. Primary ow (22mm)
- (28mm tails for 400 litre models)
9. Dual control/Overheat stat pocket (boiler)
10. Solar coil return to panel collector (22mm)
compression
11.
Solar coil ow from panel (22mm) compression
12. Solar thermostat pocket
Part G3 loose components supplied in a
separate box
A.
Combination inlet group incorporating
pressure reducing valve, strainer, check valve,
balance cold take o point, expansion relief
valve and expansion vessel connection points.
B. Potable expansion vessels c/w exible hose
and integral wall bracket
C. Tundish
D. Dual control thermostat and combined
overheat thermostat (x2)
E. Two port (22mm) zone valve for
primary circuit
F. Wiring junction box for primary system
Page 9
SYSTEM DESIGN
INSTALLATION
General Design Considerations
The cupboard footprint needs to be at least 650mm square for standard units up to
300 litres, 730mm for 400 litre and 575mm for slimline units. The base chosen for the
cylinder should be level and capable of supporting the weight of the unit when full of
water as shown in General Data. The discharge pipework for the safety valves must have
a minimum fall of 1 : 200 from the unit to a safe discharge point. All exposed pipework
and ttings on the cylinder should be insulated, and the unit should NOT be xed in a
location where the contents could freeze.
In new systems, pipes should be insulated to comply with building regs, the maximum
permissible heat loss is indicated in the table opposite, and labelled accordingly as follows:
i. Primary circulation pipes for domestic hot water circuits should be insulated
through their length, subject only to practical constraints imposed by the need
to penetrate joists and other structural elements.
ii. All pipes connected to hot water storage vessels, including the vent pipe, should
be insulated for at least 1 metre from their points of connection to the cylinder (or
they should be insulated up to the point where they become concealed).
In replacement systems, whenever a boiler or hot water storage vessel is replaced in
an existing system, any pipes that are exposed as part of the work or are otherwise
accessible should be insulated as recommended for new systems, or to some lesser
standard where practical constraints dictate.
The pipe connecting the boiler ow to the appliance must not be less than 22mm
copper or equivalent.
Standard and Slimline Model Selection Guide
Max number
Max hot water demand
1 shower room Bedsit (0) 90
1 bathroom 2 (2) 120
1 bathroom 4 (3) 120
1 bathroom + separate shower room 6 (4) 150
1 bathroom + 2 separate shower rooms or 2
bathrooms
2 bathrooms + separate shower room 7 (5) 210
2 bathrooms + 2 separate shower rooms 7 (5) 250
3 bathrooms + 2 separate showers rooms 9 (6) 300
3 bathrooms + 3 separate showers rooms 9 (6) 400
Solar Model Selection Guide
Max hot water demand Bedrooms
1 shower room Bedsit 180
1 bathroom 1-3 180
1 bathroom + 1 shower room 1-3 210
1 bathroom + 2 shower rooms 2-4 250
2 bathrooms + 1 shower room 3-4 300
2 bathrooms + 2 shower rooms 4-5 400
of bed spaces
(Bedrooms)
7 (5) 180
Indirect
litres
Indirect
litres
Insulation of pipework
Pipe outside
diameter
15mm 7.89W/m
22mm 9.12W/m
28mm 10.07W/m
35mm 11.08W/m
Further guidance on converting heat loss limits
to insulation thickness for specific thermal
conductivities is available in TIMSA “HVAC
guidance for achieving compliance with Part L
of the Building Regulations”.
Mains Water Supply
Existing properties with a 15mm supply will be
satisfactory provided the local mains pressure is
good, but should be conned to single bathroom
properties. For new properties where simultaneous
demand is required to more than one bathroom
or a bathroom and one or more en-suites, the
communication and service pipe into the dwelling
should be a minimum of 22mm (usually in the
form of a 25mm MDPE supply). The optimum
performance is achieved if the inlet pressure is
3 bar dynamic. However, the qSpa will function
with lower inlet pressures, but this will reduce the
performance. For optimum performance, 30L per
minute incoming mains ow should be present,
however the qSpa will work at lower ow rates,
although performance will be aected. Normally
qSpa provides well in excess of 40 litres/min in
most conditions. Flow rates for ALL mains pressure
systems are subject to district pressures and system
dynamic loss. Particularly on larger properties with
more than one bathroom, the pipe sizes should be
calculated in accordance with BS EN 806-3:2006
and BS 8558:2011.
Model Selection
The suggested model sizes are based on
typical hot water usage. For high specication
dwellings an increase of one model size should
be considered.
Maximum
heat loss
INSTALLATION
Page 10
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