MEGAFLO Unvented Hot Water Cylinders 800L -1000L Important

MEGAFLO Unvented Hot Water Cylinders 800L -1000L Important
MEGAFLO Eco Plus Solar
Unvented Hot Water Cylinders
800L -1000L
Important
Please read & understand all these instructions before commencing installation.
Please leave this manual with the customer for future reference
MEGAFLO Eco Plus Solar Product Guide
Contents
1. Introduction................................................................................................. 3
1.1 General..................................................................................................... 3
1.2 Symbols used............................................................................................. 3
1.3 Abbreviations............................................................................................ 3
1.4 Liabilities.................................................................................................... 3
2. Safety............................................................................................................ 4
2.1 General safety warnings............................................................................ 4
2.2 Recommendations..................................................................................... 4
2.3 Specific safety instructions......................................................................... 4
3. Technical specifications............................................................................... 5
3.1 Technical data............................................................................................ 5
3.2 Dimensions and connections...................................................................... 8
3.3 Electrical diagram(s)................................................................................... 7
4. Description of the product........................................................................ 11
4.1 General description.................................................................................. 11
4.2 Operation principle.................................................................................. 11
4.3 Main components.................................................................................... 11
4.4 Standard delivery..................................................................................... 11
5. Before installation..................................................................................... 13
5.1 Installation regulations............................................................................. 13
5.2 Installation requirements.......................................................................... 13
5.3 Choice of location................................................................................... 13
5.4 Transport................................................................................................. 14
6. Installation................................................................................................. 15
6.1 General................................................................................................... 15
6.2 Water connections................................................................................... 15
6.3 Electrical connections............................................................................... 21
6.4 Filling the installation............................................................................... 21
6.5 Solar Primary installation.......................................................................... 22
7. Commissioning........................................................................................... 23
7.1 General................................................................................................... 23
7.2 Checklist before commissioning............................................................... 23
7.3 Commissioning procedure....................................................................... 23
8. Operation................................................................................................... 24
8.1 General................................................................................................... 24
9. Maintenance.............................................................................................. 25
9.1 General................................................................................................... 25
9.2 Standard inspection & maintenance operations........................................ 25
10. Troubleshooting....................................................................................... 27
10.1 Fault finding.......................................................................................... 27
11. Decommissioning..................................................................................... 28
11.1 Decommissioning procedure.................................................................. 28
12. Spare parts............................................................................................... 28
12.1 Spare parts list....................................................................................... 28
Benchmark checklist...................................................................................... 30
Commissioning & service records................................................................. 31
Guarantee....................................................................................................... 33
2
Unvented Hot Water Cylinder
1. Introduction
1.1 General
In the interest of UK customers, we are continuously
endeavouring to make improvements in product quality.
All the specifications stated in this document are therefore
subject to change without notice.
The following instructions are offered as a guide to the
user and installer.
Our liability as the manufacturer may not be invoked in
the following cases:
The installation must be carried out by a competent
plumbing and electrical installer in accordance with
Building Regulation G3 (England and Wales), Technical
Standard P3 (Scotland) or Building Regulation P5
(Northern Ireland) and the Water Fitting Regulations
(England and Wales) or Water Byelaws (Scotland).
`` Failure to abide by the instructions on using the
appliance.
`` Faulty or insufficient maintenance of the appliance.
`` Failure to abide by the instructions on installing the
product.
1.2 Symbols used
In these instructions, various risk levels are employed to
draw the user’s attention to particular information. In
doing so we wish to safeguard the user, avoid hazards
and guarantee the correct operation of the appliance.
DANGER
Risk of a dangerous situation causing serious
physical injury.
WARNING
Risk of dangerous situation causing slight
physical injury.
Installer's liability
The installer is responsible for the installation and the
commissioning of the appliance. The installer must
respect the following instructions:
`` Read and follow the instructions given in the manuals
provided with the appliance.
`` Carry out installation in compliance with the
prevailing legislation and standards.
`` Perform the initial start up and carry out any checks
necessary.
`` Complete the commissioning checklist.
`` Explain the installation to the user.
`` If maintenance is necessary, warn the user of the
obligation to check the appliance and maintain it in
good working order.
`` Give all the instruction manuals to the user.
Users liability
CAUTION
Risk of material damage.

Signals important information.
1.3 Abbreviations
`` T&P - Temperature & Pressure relief valve
`` PRV - Pressure Reducing Valve
`` Prv - Pressure relief valve
1.4 Liabilities
Manufacturers liability
Our products are manufactured in compliance with
the requirements of the various applicable European
Directives.
This appliance complies with the requirements of the CE
marking directive.
To guarantee optimum operation of the appliance, the
user must respect the following instructions:
`` Read and follow the instructions given in the manuals
provided with the appliance.
`` Call on qualified professionals to carry out installation
and initial start up.
`` Get your fitter to explain your installation to you.
`` Have your required checks and services done.
`` Keep the instruction manuals in good condition and
close to the appliance.
This appliance can be used by children aged
from 8 years and above and persons with
reduced physical sensory or mental capabilities
or lack of experience and knowledge if they
have been given supervision or instruction
concerning use of the appliance in a safe way
and understand the hazards involved. Children
shall not play with the appliance. Cleaning and
user maintenance shall not be made by children
without supervision.

Children must be supervised to ensure they do
not play with the appliance.
Unvented Hot Water Cylinder
3
2. Safety
2.1 General safety warnings
DANGER
This cylinder is unvented and as such becomes
pressurised when in operation. The combination
of pressurisation and hot water could lead to
serious physical injury if the safety instructions in
this manual are not adhered to.
WARNING
`` Only competent persons having received
adequate training are permitted to work
on the appliance and the installation.
`` Do not tamper with any of the safety
valves or controls supplied with the
cylinder.
`` Before any work, switch off the mains
supply to the appliance.
`` Do not switch on if there is a possibility
that the water in the cylinder is frozen.
CAUTION
Do not operate immersion heaters until the
cylinder has been filled with water.
2.2 Recommendations
WARNING
When handling the unit, take appropriate
precautions for the weight of the unit. Weights
can be found in section 3, table 1, page 5.
CAUTION
Annual maintenance is recommended by a
competent person.
4
Unvented Hot Water Cylinder
2.3 Specific safety instructions
WARNING
`` If
water
discharges
from
the
temperature/pressure relief valve on the
cylinder shut down the boiler. Do not
turn off any water supply. Contact a
competent installer for unvented water
heaters to check the system.
`` Do not tamper with any of the safety
valves fitted to the system. If a fault is
suspected contact a competent installer.
`` DO NOT bypass the thermal cut-out(s) in
any circumstances.
3. Technical specifications
3.1 Technical data
1000i Solar
Max direct kW rating
800i Solar
Solar:
6
6
Aux Coil surface area m²
1.5
Solar Coil surface area m²
3
15l/min
25.1
26.6
30l/min
37.2
38.3
60l/min
47.5
45.8
15l/min
64.2
74.5
30l/min
44.6
54.1
60l/min
34.2
42.8
Solar Coil Rating (kW)
30l/min
42.9
54.3
Solar coil heat up time
(mins)
30l/min
47.3
50.8
Aux Coil rating (kW)
Aux coil heat up time
(mins)
Pressure drop through
Aux coil (MPa)
Pressure drop through
solar coil (MPa)
15l/min
0.001
30l/min
0.002
60l/min
0.017
15l/min
0.002
30l/min
0.008
60/min
0.030
Heat loss (kWh in 24h)
2.74
3.33
Hot water capacity (volume of water drawn off >40°C)
681
850
Weight full (kg)
Weight empty (kg)
1017
1225
217
225
Max supply pressure
1.6MPa (16 bar)
Max design pressure
0.8 MPa (8 bar)
Max operating pressure (PRV)
0.35MPa (3.5 bar)
Max expansion vessel charge pressure
1.0MPa (10 bar)
Expansion relief valve setting
0.8MPa (8 bar)
T&P valve setting
1.0MPa (10 bar)/90°C
Expansion Prv set pressure
0.8MPa (8 bar)
Maximum primary pressure (Solar and Aux) (see Note 3)
1.0MPa (10 bar)
Notes:
1. Indirect cylinders tested in conformance with BS EN 12897:2006.
2. Heat up time from cold through 45°C, based on a flow temperature of 80°C +/- 2°C & normal volume.
3. The primary coil should not be exposed to more than 0.3MPa (3 bar) without the cylinder being full of water and
under the minimum working pressure.
Table 1: Technical data - Solar
Unvented Hot Water Cylinder
5
A
K
J
I
H
G
F
E
D
C
B
1111 REF
Ø1019 REF
OUTLET
2”BSP FEMALE
35° REF
40°REF
30°REF
45°REF
Figure 1: General dimensions - Solar 800l - 1000l
Item
A
B
C
D
E
F
G
H
I
J
K
Connection
NA
T&P/ 1/2" BSP
1/2" & 1" BSP
1 3/4" BSP
1/2" BSP
1 1/4" BSP
1 1/4" BSP
1/2" BSP
1 1/4" BSP
1 1/4" BSP
1" BSP
Table 3: General dimensions table - Solar 800l - 1000l
6
Unvented Hot Water Cylinder
800l
1914
1503
1218
1138
1049
998
798
710
623
448
438
1000l
2327
1863
1538
1338
1249
1198
998
710
623
448
438
Schematic Wiring Diagram - Basic 2 x 2 Port Valve System
Cylinder terminal block
2
1
3
3
Zone valve (HTG)
Room stat
Zone valve (DHW)
(supplied)
3
2
G Br Bl 0
2
1
G Br Bl 0 GY
1
2
1
3
L
(Supply)
N
1
2
3
4
5
6
7
8
9 10
1
2
3
4
5
6
7
8
9 10
HTG
ON
L N
DHW
ON
Programmer
Junction box
L
2 3
1 2 3
L N
2
2
3
N
Boiler
Pump
NOTES: Control terminal numbering may differ from those shown.
Refer to instructions with controls selected.
A double pole isolating switch must be installed in the mains supply.
All earth connections must be connected back to the mains earth supply.
Figure 2: Schematic wiring diagram - basic 2 x 2 port valve system
Schematic Wiring Diagram - 3 Port Mid Position Valve System. N.B. Must Be Used In Conjunction
With 2 Port Zone Valve Supplied
Cylinder terminal block
2
1
3
3
Zone valve (HTG)
Zone valve (DHW)
(supplied)
G W Bl 0 GY
G Br Bl 0
2
3
L
(Supply)
N
1
2
3
4
5
6
7
8
9 10
1
2
3
4
5
6
7
8
9 10
1 2 3
L N
2
HTG
ON
DHW
ON
Programmer
2
1
DHW
OFF
1
3
2
Room stat
L
2 3
L N
Boiler
Junction box
2
N
3
Pump
NOTES: Control terminal numbering may differ from those shown.
Refer to instructions with controls selected.
A double pole isolating switch must be installed in the mains supply.
All earth connections must be connected back to the mains earth supply.
Figure 3: Schematic wiring diagram - 3 port mid position system
Unvented Hot Water Cylinder
7
6kW immersion
Step 1:
- remove 4 retaining screws and lift lid off immersion heater
Step 2:
- remove 2 screws holding thermostatic controls and slide out
thermostat from stat pocket.
Step 3:
- Wire up immersion as per figures 6, page 11. If three phase
wiring chosen remove “Live” side buzz bar and fit extra posts
(supplied) to L1, L2 & L3. (outer case and bracket removed for clarity)
Notes:
For single phase wiring use 4mm² H07RNF 3 Core
Use 2 x Two Pole 40A contactors for single phase
For 3 phase use Five core 1mm² Fused at max 10A
Use 2 x Three Pole 16A per pole contactors for 3 phase
For signal wire use 5 core 1mm² Fused at max 6A for thermostat
and thermal cut-out controls.
Disconnection time of the circuit protective device must be maintained
below the regulatory minimum (in the UK 5 seconds for fixed equipment),
cable sizes may have to be higher depending on the characteristics of the
installation supply.
Step 4:
Replace thermostatic controls taking care when inserting
the capillary bulbs into stat pocket and wire up as per
figure 6 or 7, page 9 .
Figure 4: Immersion head assembly
8
Unvented Hot Water Cylinder
Single phase wiring schematic
Earth
Neutral
Live
Fuse
(not supplied)
E
L
1
A
B
2
N
B
2
3
T
= Approx 65°
S
A
B
L
A
= Min temp
Thermostat Controls
1
= Max temp
2
1
Live
Rotate spindle clockwise to increase
temperature and counter clockwise to
decrease the temperature
2
A
1
B
A
Earth
Neutral
Immersion Heater
Note:
The 2 external contactors must be approved
components certified for 10,000 cycles of
operation for the contactor controlled by the
thermostat and at least 30 for the contactor
controlled by the non-self-resetting thermal
cut-out.
Figure 5: Single phase wiring schematic
2
1
Contactors
(not supplied)
3 phase wiring schematic
Earth
Neutral
L1
L2
L3
B
B-2 = Thermostat controls
A-1 = Thermal cut-out
Fuse
(not supplied)
1
A
B
2
Contactors
(not supplied)
S
A
B
L
Thermostat Controls
3
1
N
T
L3
L1
2
E
L2
L1
L2
L3
Earth
Neutral
Figure 6: Three phase wiring schematic
Immersion Heater
Unvented Hot Water Cylinder
9
High limit
thermostat
1
C
2
Control
thermostat
C
3
2
Load (Demand Contact)
Satisfied
Common
(S/L)
Temperature
Adjustment
10
Unvented Hot Water Cylinder
30
50 40
Figure 7: Indirect wiring schematic
0
°C
70 60
Thermal cut-out
reset under screw
head
4. Description of the product
4.1 General description
This product is a purpose designed unvented water
heater. The unit has a stainless steel inner vessel, which
ensures an excellent standard of corrosion resistance. The
outer casing is a combination of resilient thermoplastic
mouldings and soft jacket. All products are insulated with
CFC free polyurethane foam (GWP 3.1) to give good heat
loss protection.
The unit is supplied complete with all the necessary safety
and control devices needed to allow connection to the
cold water mains. All these components are preset and
should not be tampered with.
4.2 Operation principle
The unvented cylinder is used to heat and store hot water
for use in commercial applications.
Depending on the model the water can be heated directly
using an element (supplied separately) or indirectly
through a coil in the unit using an external heat source
e.g. Gas, Oil or Electric.
To provide pressure to the tap or shower an unvented
unit uses the incoming mains water pressure. To do this
the cylinder is sealed and not vented. However, when the
volume of water is heated it expands and without any
room for expansion could cause the cylinder to rupture
and fail. To allow expansion of this heated water it is
important that an expansion vessel is used. This vessel is
pressurised and gives the heated water room to expand.
4.3 Main connections
See Figure 8: Main connections on page 12
4.4 Standard delivery
The delivery includes:
`` Cylinder
`` Literature pack
`` Instructions (inc benchmark commissioning checklist
& service record)
`` Cold water control pack
`` Expansion vessel
`` Combination valve (inc pressure reducing valve,
pressure relief valve and check valve)
`` Tundish
`` 2 port zone valve (indirect only)
`` Solar thermal cut-out
Unvented Hot Water Cylinder
11
Hot outlet
Sensor pocket
T&P connection
Secondary return
Immersion heater
Auxillary flow
Auxillary thermostat
Auxillary return
Primary flow
Primary return
Figure 8: Main Connections
12
Unvented Hot Water Cylinder
Solar thermal cut-out
Cold inlet
5. Before installation
5.1 Installation regulations
WARNING
Installation of the appliance must be carried
out by a qualified engineer in accordance
with prevailing and national regulations as
listed below.
`` Building Regulations G3
`` The Building Standards (Scotland)
`` The Building Regulations (Northern
Ireland)
`` I.E.E Electrical Regs
`` UK Water Regulations
5.2 Installation requirements
Water supply
In an unvented system the pressure and flow-rate is
directly related to the incoming water supply. For this
reason it is recommended that the maximum water
demand is assessed and the water supply checked to
ensure this demand can be satisfactorily met.
`` We suggest the minimum supply requirements
should be 0.15MPa (1.5 bar) pressure and 60 litres
per minute flow rate. However, at these values outlet
flow rates may be poor if several outlets are used
simultaneously.
`` A 28mm cold water supply is recommended,
however, if a smaller supply exists, which provides
sufficient flow, this may be used (although more
flow noise may be experienced).
`` The higher the available pressure and flow rate the
better the system performance.
`` See table 1 on page 5 for cylinder operating
pressures. This is controlled by the cold water
combination valve assembly.
`` The water supply must be of wholesome water
quality (Fluid Category 1 as defined by the Water
Supply Regulations 1999).
``
``
``
``
``
``
``
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
appropriate safety devices are installed.
Situations where maintenance is likely to be neglected
or safety devices tampered with.
Water supplies that have either inadequate pressure
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 filtration
can be ensured.
In areas where the water supply contains chloride
levels that exceed 250mg/l.
5.3 Choice of location
The cylinder must be vertically floor mounted. Although
location is not critical, the following points should be
considered:
`` The cylinder 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 pipe work 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
must be available for the servicing and maintenance
of the system. Where these controls are installed
against a wall a minimum distance of 250mm must
be left.
`` Ensure that the floor area for the cylinder is level and
capable of permanently supporting the weight when
full of water (see table 1, page 5 for weights).
Outlet/terminal fittings (taps, etc.)
`` The cylinder can be used with most types of terminal
fittings.
`` Outlets situated higher than the cylinder 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.
`` All fittings, pipework and connections must have
a rated pressure of at least 8 bar (dependant on
cylinder being fitted) at 80°C.
Wall
Min 600mm
Min 600mm
Limitations
The cylinder should not be used in association with any
of the following:
`` Solid fuel boilers or any other boiler in which the
Figure 9: Siting the unit if immersions not at the front
Unvented Hot Water Cylinder
13
Figure 10: Lifting the unit
14
Unvented Hot Water Cylinder
6.2 Water connections
6. Installation
6.1 General
WARNING
After reading the previous sections in this booklet and
choosing a good location for the unit please install,
paying attention to the following hydraulic, electrical and
commissioning sections.
`` Under no circumstances should the
factory
fitted
temperature/pressure
relief valve be removed other than
by a competent person. To do so will
invalidate any guarantee or claim.
`` The cold water combination valve
assembly must be fitted on the mains
water supply to the cylinder.
`` No control or safety valves should be
tampered with or used for any other
purpose.
`` The discharge pipe should not be blocked
or used for any other purpose.
`` The tundish should not be located
adjacent to any electrical components.
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 cylinder should not exceed
2.5m.
`` Can be a sealed system or open vented type maximum primary pressure 3 bar.
`` The boiler cannot be vented through the cylinder.
Refer to the installation schematic (fig 11, below) for
details on the pipework layout. Specific details for the
discharge pipework layout is also provided in figure 14
on page 20.
`` All pipe fittings are made via BSP female pipe
connections directly to the unit.
`` A stopcock or servicing valve should be incorporated
into the cold water supply to enable the cylinder and
its associated controls to be isolated and serviced
T&P relief
valve
Expansion
vessel
Balanced cold
water connection
Pressure reducing
valve
Pressure relief
valve
Secondary
return
Mains water
supply
Auxiliary
flow
Auxiliary
return
Solar
flow
Solar
return
Inlet
Drain cock
Tundish
Discharge pipe
Figure 11: Typical installation schematic (not to scale)
Unvented Hot Water Cylinder
15
(not supplied).
`` The expansion vessel must be connected between
the cold water combination valve and the cylinder.
`` The location of the expansion vessel should allow
access to recharge the pressure as and when
necessary.
`` A suitable draining tap should be installed in the cold
water supply to the cylinder between the expansion
valve and the heater at as low a level as possible.
`` It is recommended that the outlet point of the drain
pipework be at least 1 metre below the level of the
heater (this can be achieved by attaching a hose to
the drain tap outlet spigot).
``
``
``
``
Cold water control pack
CAUTION
`` The expansion vessel pressure must be
set in accordance with the inlet pressure
set on the pressure reducing valve.
`` Flush
supply
pipework
before
connection to remove all flux and debris
prior to fitting the inlet controls. Failure
to do this may result in irreparable
damage to the controls and will
invalidate any warranty.
`` The cold water control pack can be connected
anywhere on the cold water cylinder supply prior to
the expansion vessel.
`` The control pack incorporates the strainer, check
valve, core unit and expansion relief valve.
`` The valve can be fitted in any orientation to suit
the installation as long as the valve is installed with
the direction of flow arrows pointing in the correct
direction.
The expansion relief valve should be installed with
the discharge pipework in either the horizontal
position or facing downwards.
No other valves should be placed between the cold
water combination valve and the cylinder.
The blank plastic plugs in the body of the pressure
relief valve are pressure gauge connections to enable
pressure monitoring to be carried out, should the
system develop a fault. It is recommended that these
be accessible (the pressure reducing valve has two –
only one need be accessible).
Where discharge pipework is difficult to attain, the
local building control officer from the local council
should be sought for advice as this falls under G3
guidelines and is not down to the manufacturer for
unvented systems
``
Auxiliary circuit control
`` The 2 port motorised valve supplied with the cylinder
MUST be fitted on the auxiliary flow to the cylinder
heat exchanger and wired such that in the event of
the cylinder overheating it will close the auxiliary
circuit.
`` Auxiliary circulation to the cylinder heat exchanger
must be pumped; gravity circulation WILL NOT
WORK.
`` It is recommended that an air bleed or automatic air
vent is fitted into the highest point of the system.
`` Boiler flow temperature should be set to 82°
(maximum flow temperature to auxiliary heat
exchanger 89°C).
direction
8 bar Pressure
relief valve
Pressure relief
discharge
3.5 bar Pressure
reducing valve
direction
Mains water in
To cylinder
Pressure gauge
connections (one
each side)
28mm compression connections
Figure 12: Cold water combination valve
16
Unvented Hot Water Cylinder
Secondary circulation
If secondary circulation is required it is recommended
that it be connected to the cylinder as shown (see fig.
13, below).
`` The secondary return pipe should be in 28mm pipe
and incorporate a check valve to prevent backflow.
`` A suitable WRAS approved bronze circulation pump
will be required.
`` On large systems, due to the increase in system water
content, it may be necessary to fit an additional
expansion vessel to the secondary circuit. This should
be done if the capacity of the secondary circuit
exceeds 10 litres.

In direct electric installations where a secondary
circulation is required particular attention should be
paid by the installer to maintain the returning water
temperature (guidelines state that a minimum of 55°C
return temperature is advisable). Factors such as, but not
limited to, secondary circulation flow rates, minimising
heat loss of all secondary circuit pipework and timed
operation during periods of high demand are critical
to the correct operation and longevity of the heating
element(s) and thermostats.
Pipe capacity (copper):
15mm O.D. = 0.13 l/m (10 litres = 77m)
22mm O.D. = 0.38 l/m (10 litres = 26m)
28mm O.D. = 0.55 l/m (10 litres = 18m)
Note: Plastic pipe capacities may be reduced due to
thicker wall sections.
T&P relief
valve
WRAS approved pump
(not supplied)
Secondary
return
Auxiliary
flow
Auxiliary
return
Solar
flow
Solar
return
Inlet
Drain cock
Figure 13: Secondary circulation schematic
Unvented Hot Water Cylinder
17
Discharge
It is a requirement of Building Regulation G3 that any
discharge from an unvented system is conveyed to where
it is visible, but will not cause danger to persons in or about
the building. The tundish and discharge pipes should be
fitted in accordance with the requirements and guidance
notes of Building Regulation G3. The G3 Requirements
and Guidance section 3.50 - 3.63 are reproduced in the
following sections of this manual. For discharge pipe
arrangements not covered by G3 Guidance advice should
be sought from your local Building Control Officer. Any
discharge pipe connected to the pressure relief devices
(expansion valve and temperature/pressure relief valve)
must be installed in a continuously downward direction
and in a frost free environment.
3.55Any discharge should be visible at the tundish. In
addition, where discharges from safety devices may
not be apparent, e.g. in dwellings occupied by people
with impaired vision or mobility, consideration should
be given to the installation of a suitable safety device
to warn when discharge takes place, e.g. electronically
operated.
Discharge pipe D2
3.56The discharge pipe (D2) from the tundish should:
Water may drip from the discharge pipe of the pressure
relief device. This pipe must be left open to the
atmosphere. The pressure relief device is to be operated
regularly to remove lime deposits and to verify that it is
not blocked.
(a) have a vertical section of pipe at least 300mm
long below the tundish before any elbows or bends in
the pipework (see fig. 13); and
(b) be installed with a continuous fall thereafter of at
least 1 in 200.
G3 REQUIREMENT
3.57The discharge pipe (D2) should be made of:
(a) metal; or
(b) other material that has been demonstrated to be
capable of safely withstanding temperatures of the water
discharged and is clearly and permanently marked to
identify the product and performance standard (e.g. as
specified in the relevant part of BS 7291).
“...there shall be precautions...to ensure that the
hot water discharged from safety devices is safely
conveyed to where it is visible but will not cause danger
to persons in or about the building.”
The following extract is taken from the latest G3
Regulations
Discharge pipes from safety devices
Discharge pipe D1
3.50Each of the temperature relief valves or combined
temperature and pressure relief valves specified in
3.13 or 3.17 should discharge either directly or by way
of a manifold via a short length of metal pipe (D1) to a
tundish.
3.51The diameter of discharge pipe (D1) should be
not less than the nominal outlet size of the temperature
relief valve.
3.52Where a manifold is used it should be sized to
accept and discharge the total discharge from the
discharge pipes connected to it.
3.53Where valves other than the temperature and
pressure relief valve from a single unvented hot water
system discharge by way of the same manifold that
is used by the safety devices, the manifold should be
factory fitted as part of the hot water storage system
unit or package.
18
Note: To comply with the Water Supply (Water Fittings)
Regulations, the tundish should incorporate a suitable
air gap.
3.58The discharge pipe (D2) should be at least one
pipe size larger than the nominal outlet size of the safety
device unless its total equivalent hydraulic resistance
exceeds that of a straight pipe 9m long, i.e. for discharge
pipes between 9m and 18m the equivalent resistance
length should be at least two sizes larger than the
nominal outlet size of the safety device; between 18
and 27m at least 3 sizes larger, and so on; bends must
be taken into account in calculating the flow resistance.
See Fig 13, Table 3 and the worked example.
Note: An alternative approach for sizing discharge
pipes would be to follow Annex D, section D.2 of BS
6700:2006 Specification for design, installation, testing
and maintenance of services supplying water for
domestic use within buildings and their curtilages.
3.59Where a single common discharge pipe serves
more than one system, it should be at least one pipe
size larger than the largest individual discharge pipe
(D2) to be connected.
Tundish
3.60The discharge pipe should not be connected to a
soil discharge stack unless it can be demonstrated that
the soil discharge stack is capable of safely withstanding
temperatures of the water discharged, in which case, it
should:
3.54The tundish should be vertical, located in the
same space as the unvented hot water storage system
and be fitted as close as possible to, and lower than,
the valve, with no more than 600mm of pipe between
the valve outlet and the tundish (see fig 13).
(a) contain a mechanical seal, not incorporating a
water trap, which allows water into the branch pipe
without allowing foul air from the drain to be ventilated
through the tundish;
(b) be a separate branch pipe with no sanitary
Unvented Hot Water Cylinder
appliances connected to it;
(c) if plastic pipes are used as branch pipes carrying
discharge from a safety device they should be either
polybutylene (PB) to Class S of BS 7291-2:2006 or
cross linked polyethylene (PE-X) to Class S of BS
7291-3:2006; and
(d) be continuously marked with a warning that no
sanitary appliances should be connected to the pipe.
Note:
1. Plastic pipes should be joined and assembled with
fittings appropriate to the circumstances in which they
are used as set out in BS EN ISO 1043-1.
2. Where pipes cannot be connected to the stack it
may be possible to route a dedicated pipe alongside or
in close proximity to the discharge stack.
Termination of discharge pipe
3.61The discharge pipe (D2) from the tundish should
terminate in a safe place where there is no risk to
persons in the vicinity of the discharge.
3.62Examples of acceptable discharge arrangements
are:
(a) to a trapped gully with the end of the pipe below a
fixed grating and above the water seal;
(b) downward discharges at low level; i.e. up to
100mm above external surfaces such as car parks,
hard standings, grassed areas etc. are acceptable
providing that a wire cage or similar guard is positioned
to prevent contact, whilst maintaining visibility; and
(c) discharges at high level: e.g. into a metal hopper
and metal downpipe with the end of the discharge pipe
clearly visible or onto a roof capable of withstanding
high temperature discharges of water and 3m from
any plastic guttering system that would collect such
discharges.
Worked example of discharge pipe sizing
Fig. 13: shows a G1/2 temperature relief valve with a
discharge pipe (D2) having 4 No. elbows and length of
7m from the tundish to the point of discharge.
From Table 3:
Maximum resistance allowed for a straight length of
22mm copper discharge pipe (D2) from a G1/2
temperature relief valve is 9.0m.
Subtract the resistance for 4 No. 22mm elbows at 0.8m
each = 3.2m
Therefore the permitted length equates to: 5.8m
5.8m is less than the actual length of 7m therefore
calculate the next largest size.
Maximum resistance allowed for a straight length of
28mm pipe (D2) from a G1/2 temperature relief valves
equates to 18m.
Subtract the resistance of 4 No. 28mm elbows at 1.0m
each = 4.0m
Therefore the maximum permitted length equates to:
14m
As the actual length is 7m, a 28mm (D2) copper pipe will
be satisfactory.
3.63The discharge would consist of high temperature
water and steam. Asphalt, roofing felt and non-metallic
rainwater goods may be damaged by such discharges.
Unvented Hot Water Cylinder
19
Valve
Minimum Size Of
Outlet Size Discharge Pipe D1
Minimum Size Of
Discharge Pipe D2
From Tundish
Maximum Resistance
Allowed, Expressed As A
Length Of Straight Pipe
(I.E. No Elbows Or Bends)
Resistance
Created By Each
Elbow Or Bend
G1/2
15mm
22mm
28mm
35mm
up to 9m
up to 18m
up to 27m
0.8m
1.0m
1.4m
G3/4
22mm
28mm
35mm
42mm
up to 9m
up to 18m
up to 27m
1.0m
1.4m
1.7m
G1
28mm
35mm
42mm
54mm
up to 9m
up to 18m
up to 27m
1.4m
1.7m
2.3m
Table 6: Sizing of copper discharge pipe (D2) for common temperature relief valve outlet sizes
Safety device
(e.g. Temperature
relief valve)
Metal discharge pipe (D1) from
Temperature relief valve to tundish
Tundish
600mm maximum
300mm
minimum
Discharge below
fixed grating
(Building Regulation
G3 section 3.61 gives
alternative points
of discharge)
Fixed grating
Discharge pipe (D2) from tundish,
with continuous fall. See Building
Regulation G3 section 3.56,
Table 1 and worked example
Trapped
gully
Figure 14: Typical discharge pipe arrangement (extract from Building Regulation G3 Guidance Section 3.50)
20
Unvented Hot Water Cylinder
6.3 Electrical connections
In case of difficulty contact service support; contact
details are available on page 32 of this booklet.
WARNING
`` Disconnect from the mains electrical
supply before removing any covers.
`` Never attempt to replace the immersion
heater(s) other than with genuine
manufacturers
components.
Using
other manufacturers components may
invalidate the warranty on the cylinder.
`` DO NOT bypass the thermal cut-out(s) in
any circumstances. All electrical wiring
should be carried out by a competent
electrician and be in accordance with
the latest I.E.E Wiring Regulations.
`` Each circuit must be protected by a
suitable fuse and double pole isolating
switch with a contact separation of at
least 3mm in both poles.
`` DO NOT operate the immersion heaters
until the cylinder has been filled with
water.
6.4 Filling the installation
`` Check expansion vessel pre-charge pressure. The
expansion vessel pressure must be set in accordance
with the inlet pressure set on the pressure reducing
valve.
`` Ensure the drain cock is CLOSED.
`` Open a hot tap furthest from the cylinder.
`` Open the mains stop cock to fill the unit. When water
flows from the tap, allow to run for a few minutes to
thoroughly flush through any residue, dirt or swarf,
then close the tap.
`` Open successive hot taps to purge the system of air.
`` All immersion heaters are fitted with a dual
thermostat and thermal cut-out and must be wired
in accordance with figures 5 & 6, page 9 depending
a single phase or 3 phase installation.
Space and heating systems controls
`` The controls provided with the cylinder will ensure
the safe operation of the unit within the central
heating system. Other controls will be necessary to
control the space heating requirements and times
that the system is required to function.
`` The cylinder is compatible with most heating
controls, examples of electrical circuits are shown
in figs. 3 and 4, page 8. However, other systems
may be suitable, refer to the controls manufacturers
instructions, supplied with the controls selected, for
alternative system wiring schemes.
Unvented Hot Water Cylinder
21
6.5 SOLAR PRIMARY
The solar controller and solar primary circulation pump
must be wired via the over-temperature cut-out mounted
in the lower solar controls housing (see figure 15, below).
This will ensure that the heat input to the solar coil is
interrupted in the event of the cylinder over-heating.
There must also be suitable Check (non-return) valves
installed in the solar primary flow and return to prevent
the possibility of any thermo-syphoning if the solar
circulation is stopped.
CONNECTION TO THE SOLAR PRIMARY CIRCUIT
The lower (Solar) coil of the cylinder must be connected to
a fully pumped solar primary circuit. The connections are
suitable for a 28mm copper pipe direct to compression
fittings. The connections are also threaded 1 1/4” BSP
female parallel should BSP connections be required.
The solar primary circuit must have its own dedicated
circulating pump, thermal and safety controls which
must be installed as per the manufacturer’s instructions.
Connection to the solar differential temperature controller
should be in accordance with the manufacturer’s
instructions. The controller should be set to give a
recommended cylinder temperature of approx. 65°C 70°C otherwise nuisance operation of the thermal cutouts may occur.
CONTROL OF SOLAR PRIMARY CIRCUIT
Temperature control of the Solar cylinder must be
carried out using a suitable proprietary solar differential
temperature controller.
The cylinder temperature
sensing probe (usually supplied with the solar differential
temperature controller) should be inserted into the pocket
provided on the Solar cylinder and its cable secured using
the cable clamp supplied.
The Solar cylinders are fitted with two additional sensor
pockets for use with solar controllers.
THERMAL CUT-OUT
PROBE
High limit
thermostat
C
2
1
SOLAR CONTROLLER
POWER SUPPLY TO
SOLAR CONTROLLER
L
N
E
Figure 15: Solar wiring lay out
22
Unvented Hot Water Cylinder
7. Commissioning
7.1 General
After filling the installation with water in the previous
section please follow the following steps to complete the
installation of the unit.
WARNING
DO NOT operate the immersion heaters or
primary circuit until the cylinder has been
filled with water.
7.2 Checklist before commissioning
`` Check all water connections for leaks and rectify as
necessary.
`` Turn off mains water supply.
`` Remove the pressure reducing valve head work to
access the strainer mesh, clean and re-fit.
`` Turn the water supply back on.
`` Manually open, for a few seconds, each relief valve
in turn, checking that water is discharged and runs
freely through the tundish and out at the discharge
point.
`` Ensure that the valve(s) reseat satisfactorily.
Indirect Units (Solar Primary Circuit)
`` Fill the solar primary circuit following the instructions
provided with the solar hydraulic controls.
`` The cylinder temperature control sensor probe
supplied with the solar differential temperature
controller must be inserted into the pocket in the
lower controls housing and its cable securely
clamped.
`` Heating by the solar primary circuit is controlled by
the solar differential temperature controller, refer
to the manufacturer’s installation instructions for
details of how to set up and commission the solar
primary circuit.
`` The solar controller should be programmed to give
a maximum storage temperature in the Megaflo
eco Solar of 70oC although 65oC is recommended
to minimise scaling
`` WARNING: If the unit is to be left unused
following installation and commissioning,
e.g. unoccupied properties, the water heater
should be drained or regularly flushed
through with fresh mains water once a week.
`` When placing the unit into service, the
procedure for filling the unit and the system
checks above should be observed.
7.3 Commissioning procedure
Immersion heater
Temperature
Adjustment
30
0
50 40
Thermal cut-out
reset under screw
head
°C
70 60
`` Switch on electrical supply to the immersion heater
and allow the cylinder to heat up to normal working
temperature (65°C recommended).
`` If necessary the temperature can be adjusted by
inserting a flat bladed screwdriver in the adjustment
spindle on front of the immersion heater thermostat
and rotating. The adjustment represents a
temperature range of 15°C to 74°C.
`` Check the operation of thermostat and that no
water has issued from the expansion relief valve or
temperature/pressure relief valve during the heating
cycle.
Indirect units
`` Fill the indirect (auxiliary) circuit following the boiler
manufacturer’s commissioning instructions.
`` To ensure the cylinder auxiliary heat exchanger is
filled, the 2 port motorised valve (supplied) should be
manually opened by moving the lever on the motor
housing to the MANUAL setting. When the auxiliary
circuit is full return the lever to the AUTOMATIC
position.
`` Switch on the boiler, ensure the programmer is set
to Hot Water and allow the cylinder to heat up to a
normal working temperature 65oC (recommended).
Figure 16: Indirect controls
Unvented Hot Water Cylinder
23
8. Operation
8.1 General
WARNING
`` If
water
discharges
from
the
temperature/pressure relief valve on the
cylinder shut down the heat source. Do
not turn off any water supply. Contact a
competent installer for unvented water
heaters to check the system.
`` Do not tamper with any of the safety
valves fitted to the system. If a fault is
suspected contact a competent installer.
`` DO NOT bypass the thermal cut-out(s) in
any circumstances.
Benchmark
The cylinder is covered by the Benchmark Scheme
which aims to improve the standards of installation
and commissioning of domestic heating and hot water
systems in the UK and to encourage regular servicing to
optimise safety, efficiency and performance.
Benchmark is managed and promoted by the Heating
and Hotwater Industry Council. For more information
visit www.centralheating.co.uk.
Please ensure that the installer has fully completed the
Benchmark Checklist (page 31 & 32) of this manual and
that you have signed it to say that you have received a
full and clear explanation of its operation. The installer is
legally required to complete a commissioning checklist
as a means of complying with the appropriate Building
Regulations (England & Wales).
All installations must be notified to Local Area Building
Control either directly or through a Competent Persons
Scheme. A Building Regulations Compliance Certificate
will then be issued to the customer who should, on
receipt, write the Notification Number on the Benchmark
Checklist.
This product should be serviced regularly to optimise its
safety, efficiency and performance. The service engineer
should complete the relevant Service Record on the
Benchmark Checklist after each service.
The Benchmark Checklist may be required in the event of
any warranty work.
Flow performance
When initially opening hot outlets a small surge in flow
may be noticed as pressures stabilise. This is quite normal
with unvented systems. In some areas cloudiness may be
noticed in the hot water. This is due to aeration of the
water, is quite normal and will quickly clear.
24
Unvented Hot Water Cylinder
Temperature controls – direct units immersion
heater
`` Immersion heaters are fitted with a dual thermostat
and cut out, figure 6, page 9
`` Access to the thermostat can be made by opening
the immersion heater cover - DISCONNECT THE
ELECTRICAL SUPPLY BEFORE OPENING THE
COVER(S).
`` Temperature adjustment is made by rotating the
adjustment knob on the top of the thermostat. The
adjustment represents a temperature range of 15°C
to 74°C.
`` Maximum working temperature is 74°C/165°F. In
very hard water areas limit to 60/65°C (140/150°F)
DO NOT bypass the thermal cut-out in any circumstances.
Temperature controls - indirect units
The cylinder units are fitted with an indirect thermostat
and thermal cut-out. These controls must be wired in
series with the 2 port motorised zone valve supplied
to interrupt the flow of primary water around the heat
exchanger coil when the control temperature has been
reached.
DO NOT bypass the thermal cut-out(s) in any
circumstances.
Operational faults
Operational faults and their possible causes are detailed
in the Fault Finding section (p.26) of this book. It is
recommended that faults should be checked by a
competent installer.
The air volume within the expansion vessel will
periodically require recharging to ensure expanded water
is accommodated within the system. A discharge of
water INTERMITTENTLY from the expansion valve will
indicate the air volume has reduced to a point where it
can no longer accommodate the expansion.
This will require a suitably qualified person to check the
expansion vessel pressure and no attempt should be
made to re-pressurize the expansion vessel by the end
user.
9. Maintenance
9.1 General
Maintenance requirements
Unvented hot water systems have a continuing
maintenance requirement in order to ensure safe
working and optimum performance. It is essential that
the relief valve(s) are periodically inspected and manually
opened to ensure no blockage has occurred in the valves
or discharge pipework.Maintenance of this appliance
should only be carried out by a suitably qualified person.
Failure to do so could invalidate the warranty.
Similarly cleaning of the strainer element and replacement
of the air in the expansion vessel will help to prevent
possible operational faults.
Descaling immersion heater(s)
`` Turn off the mains water supply, isolate the electrical
supply and turn off boiler
`` Attach a hosepipe to the drain cock having sufficient
length to take water to a suitable discharge point
below the level of the unit.
`` Open a hot tap close to the unit and open drain cock
to drain unit.
`` Open the cover(s) to the immersion heater housing(s)
and disconnect wiring from immersion heater(s)
thermostat(s).
`` Remove the 8 nuts and withdraw the immersion heater.
Take care when lifting the immersion heater out of the
cylinder and work within safe working practices.
`` Carefully remove any scale from the surface of the
element(s).
The maintenance checks described below should be
performed by a competent person on a regular basis, e.g.
annually to coincide with boiler maintenance.
CAUTION
DO NOT use a sharp implement as damage
to the element surface could be caused.
After any maintenance, please complete the relevant
Service Interval Record section of the Benchmark
Checklist on page 34 of this document.
9.2 Standard inspection & maintenance
operations
Inspection
The immersion heater boss can be used as an access for
inspecting the cylinder internally.
Safety valve operation
CAUTION
Water discharged may be very hot!
`` Manually operate the temperature/pressure relief
valve for a few seconds.
`` Check water is discharged and that it flows freely
through the tundish and discharge pipework.
`` Check valve reseats correctly when released.
`` Repeat the above procedure for the expansion relief
valve.
Strainer
``
``
``
``
``
``
Turn off the isolating valve prior to the Pressure Reducing
Valve or the main stop cock to the system.
Open the lowest hot tap in the system to relieve the system
pressure.
Using a spanner unscrew the pressure reducing cartridge
and remove the moulded housing. The strainer will be
removed with the cartridge.
Wash any particulate matter from the strainer under clean
running water.
Replace the strainer and screw the Pressure Reducing Valve
cartridge into the moulded housing.
Close hot tap, turn on isolating valve or main stop cock to
the system. Check for leaks.
`` Ensure sealing surfaces are clean and seals are
undamaged, if in doubt fit a new gasket. (spare part
number 95611025)
`` Replace immersion heater(s) and make sure the 8
nuts are correctly torqued (20Nm or 14.75 ft/lbf)
`` Rewire, check, close and secure immersion heater
housing cover(s).
Expansion vessel charge pressure
`` Remove the dust cap on top of the vessel.
`` De-pressurise the system by turning the mains supply
off and then opening a cold tap.
`` Check the charge pressure using a tyre pressure
gauge. The pressure must be set in accordance with
the inlet pressure set on the pressure reducing valve.
`` If it is lower than the required setting it should be
re-charged using a tyre pump (Schrader valve type).
CAUTION
DO NOT OVER-CHARGE
``
Re-check the pressure and when correct replace the
dust cap.
Unvented Hot Water Cylinder
25
Re-commissioning
`` Check all electrical and plumbing connections are
secure. Close the drain cock.
`` With a hot tap open, turn on the cold water supply
and allow unit to refill.
`` DO NOT switch on the immersion heater(s) or boiler
until the unit is full.
`` When water flows from the hot tap allow to flow
for a short while to purge air and flush through any
disturbed particles.
`` Close hot tap and then open successive hot taps in
system to purge any air.
`` When completely full and purged check system for
leaks.
`` The heating source (immersion heater(s) or boiler)
can then be switched on.
26
Unvented Hot Water Cylinder
10. Troubleshooting
`` Water contained in the cylinder may be very hot,
especially following a thermal control failure. Caution
must be taken when drawing water from the unit.
WARNING
Do not tamper with any of the safety valves
or controls supplied with the cylinder as this
will invalidate any guarantee.
10.1 Fault finding
Important
`` After servicing, complete the relevant Service Interval
Record section of the Benchmark Checklist located
on pages 34 and 35 of this document.
`` Servicing should only be carried out by competent
persons in the installation and maintenance of
unvented water heating systems.
`` Any spare parts used MUST be authorised parts.
`` Disconnect the electrical supply before removing any
electrical equipment covers.
`` NEVER bypass any thermal controls or operate system
without the necessary safety valves.
Fault
No hot water flow
Water from hot
tap is cold
Water discharges
from expansion
valve
Water discharges
from T&P relief
valve
The fault finding chart (table 7, below) will enable
operational faults to be identified and their possible
causes rectified. Any work carried out on the unvented
water heater and its associated controls MUST be carried
out by a competent installer for unvented water heating
systems. In case of doubt contact service support.
Spare Parts
A full range of spare parts are available for the
cylinder range (table 8, page 29). Refer to the technical
data label on the unit to identify the model installed and
ensure the correct part is ordered. You will need to quote
the serial number, which is printed on the data label.
Possible Cause
Remedy
Mains supply off
Check and open stop cock
Strainer blocked
Turn off water supply. Remove strainer and clean
Cold water combination valve incorrectly
fitted
Check and refit as required
Direct immersion heater not switched on
Check and switch on
Direct immersion heater thermal cut-out
has operated
Check, reset by pushing button on thermostat
Indirect programmer set to central
heating only
Check, set to domestic hot water programme
Indirect boiler not working
Check boiler operation. If fault is suspected
consult boiler manufacturer’s instructions
Indirect thermal cut-out has operated
Check, reset by pushing button on thermostat.
Check operation of indirect thermostat
Indirect motorised valve not connected
correctly
Check wiring and/or plumbing connections to
motorised valve
Intermittently
Expansion vessel charge pressure has
reduced below 3.5 bar, or set too high
See Maintenance section (p.19) for re-charging of
expansion vessel procedure
Continually
Cold water combination valve pressure
reducer not working correctly.
Expansion valve seat damaged
Check pressure from cold water combination
valve. If greater than 3.5 bar replace pressure
reducing valve cartridge.
Remove expansion valve cartridge, check
condition of seat. If necessary fit new expansion
valve
Thermal control failure
CAUTION: Water will be very hot!
Switch off power to immersion heater(s) and shut
down boiler.
DO NOT turn off water supply. When discharge
stops check all thermal controls, replace if faulty
Oxygenated water
Water from a pressurised system releases oxygen
bubbles when flowing. The milkiness will
disappear after a short while
Milky water
Table 7: Fault finding chart
Unvented Hot Water Cylinder
27
11. Decommissioning
11.1 Decommissioning procedure
``
``
``
``
``
``
Isolate electrical supplies and make safe
Isolate the water supply
Drain the cylinder
Drain the primary circuit (indirect only)
Remove cylinder
Cap pipework
Environmental information
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 an approved CFC/HCFC free
polyurethane foam with an ozone depletion factor of zero.
12. Spare parts
12.1 Spare parts list
A full range of spare parts are available for the cylinder range. Refer to the Technical Data label on the unit to identify the
model installed and ensure the correct part is ordered.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DESCRIPTION
Integrated inlet control valve set (28mm)
Pressure reducing valve (3.5 bar, 28mm)
Pressure relief valve (8 bar, 28mm)
Pressure relief cartridge
6 kW Immersion heater (1 ¾" screw thread)
Dual temperature and thermal cut-out (immersion heater)
Dual temperature and thermal cut-out (indirect)
Immersion heater "O" ring
¾" Temperature/Pressure relief valve
Expansion vessel (60L)
Tundish (22mm - 28mm)
2 port motorised valve (28mm)
1/2" Blanking stat pocket
Isolating ball valve 1"
Isolating drain valve 1"
Cut-out thermostat (solar)
Table 8: Spares
28
Unvented Hot Water Cylinder
SPARES NUMBER
95605104
95605105
95605107
95605108
95602001
95612064
95612650
95611810
95605103
95607445
95607367
95605884
95607690
95605178
95605182
95612652
1
4
3
2
9
13
8
5
13
6
7
13
16
Figure 18: Spares schematics
Unvented Hot Water Cylinder
29
Commissioning & service records
30
Unvented Hot Water Cylinder
Unvented Hot Water Cylinder
31
heater is assembled, installed or maintained and disposed
of at end of life
Indirect
Model(s)
Energy efficiency class
Storage volume V in litres
Standing loss in W
See section 3 to 9
800
C
800.0
114.0
1000
C
1000.0
139.0
Table: Technical parameters in accordance with European Commission regulations 814/2013 and 812/2013
32
Unvented Hot Water Cylinder
Lifetime Warranty*
The MEGAFLO Lifetime Warranty provides unrivalled levels of customer support and peace of mind in the unlikely event
that a problem arises from a manufacturing defect. It is supported by a large nationwide team of company-employed
field-based engineers and our own call centre, which is open 363 days a year.
This Lifetime Warranty applies in relation to the following MEGAFLO products:
•MEGAFLO cylinders
•MEGAFLO calorifiers
The MEGAFLO Domestic Lifetime* Warranty
The MEGAFLO Domestic Lifetime* Warranty covers MEGAFLO cylinders installed in domestic properties† against corrosion
for the lifetime* of the owner.
The cold water combination valve (and expansion vessel, where supplied) is covered by a five year warranty from the date
of purchase of the MEGAFLO product that includes both parts and labour. All other components, including any other
valves, fittings and controls are covered by a two year warranty from the date of purchase of the MEGAFLO product that
includes both parts and labour.
In the case of the Megaflo Systemready, Megaflo Systemfit and Megaflo SolaReady units the supplied pumps and
motorized valves ( where fitted ) are also covered by this two year warranty.
Incalloy immersion heaters ( where fitted ) are covered by a two year warranty.
Titanium Immersion heaters ( where fitted ) are covered by a five year warranty.
The MEGAFLO Commercial Lifetime* Warranty
The MEGAFLO Commercial Lifetime Warranty covers MEGAFLO cylinders and calorifiers installed in non-domestic
properties^ against corrosion for a period of 30 years from the date of purchase.
All other components, including valves, expansion vessels, immersion heaters, fittings and controls are covered by a two
year warranty from the date of purchase of the MEGAFLO product that includes both parts and labour.
Accessories
Shower heat recovery units are covered against manufacturing defects for a period of two years. Flat plate solar collectors
are covered against manufacturing defects for a period of 10 years from the date of purchase of the MEGAFLO product.
Evacuated tube solar collectors are covered against manufacturing defects for a period of five years from the date of
purchase of the MEGAFLO product. All other solar accessories are covered against manufacturing defects for a period of
two years from the date of purchase of the MEGAFLO product.
Outside of the UK
These warranties are valid for installations within the United Kingdom.
For installation in the Republic of Ireland please contact Potterton Myson (Ireland) Limited on 00353 (0) 1 4590870
For installations outside of the United Kingdom and the Republic of Ireland, please telephone MEGAFLO Export on +44
1603 420271 for further details of the warranty terms and conditions applicable.
These guarantees are valid provided that:
•The MEGAFLO product has been installed by a competent installer in accordance with the instructions contained in the
installation instructions and in compliance with all relevant laws, guidance, codes of practice and regulations in force at
the time of installation.
•The MEGAFLO product has not been modified or tampered with in any way, other than by a Heatrae Sadia or Baxi
Customer Support approved engineer.
•The MEGAFLO product has not been subject to damage by scale.
•The MEGAFLO product and any part or parts of the MEGAFLO product (whether factory fitted or otherwise) have not
been repaired or replaced other than by a Baxi Customer Support approved engineer and any replacement parts used on
Unvented Hot Water Cylinder
33
the MEGAFLO product are authorised MEGAFLO spare parts.
•The factory fitted temperature and pressure relief valve have not been tampered with or removed.
•The MEGAFLO product has not been subject to misuse or neglect.
•The MEGAFLO product has only been used for the storage of wholesome water. Should another substance be
put through the product, the warranty will be invalid unless it is part of a disinfectant procedure carried out in
accordance with BS EN 806.
•The MEGAFLO product has not been subjected to frost or freezing temperatures (except for solar collectors which
are designed for external installation).
•The Benchmark™ commissioning checklist service record, included in the MEGAFLO installation instructions has
been completed.
•Regular maintenance has been carried out by a competent person/, an approved engineer from Heatrae Sadia or
any other part of the Baxi Group Baxi Customer Support approved engineer in accordance with the requirements set
out in the maintenance section of the installation instructions.
•Access is available, at reasonable times and upon reasonable notice, to the MEGAFLO product to allow for any
inspection repair or replacement.
•The product is registered within 60 days of purchase. This can be done by telephone, online or by using the
registration form provided with the product.
•Evidence of purchase (for example a receipt or delivery note) and date of supply is submitted when making a
claim.
•The MEGAFLO product has not been affected by any cause beyond our reasonable control including, without
limitation: an act of God, explosion, flood, fire or accident; war or civil disturbance; strike, industrial action or
stoppages of work; any form of government intervention; a third party act or omission including theft or malicious
damage; failure by you to give us a correct delivery address or notify us of any change of address.
.
If any of the following situations occur, the MEGAFLO Lifetime Warranty* will not apply:
•Any wilful or accidental damage caused by your negligence
•Damage caused as a result of scale.
•Installation not in line with the installer and user manuals provided,
•Failure to comply with installation instructions (whether oral or in writing),
•Misuse of the MEGAFLO product or alteration of the MEGAFLO product not in accordance with the requirements
set out above.
•Defects which are not reported to us outside of the warranty period on 03444 8711535 or [email protected]
baxi.co.uk
•Any third party repair or replacement costs unless those costs have been agreed and authorised by Baxi Customer
Support or Heatrae Sadia in writing prior to incurring the costs.
•In relation to the MEGAFLO Commercial Lifetime Warranty only, we will not be liable for any indirect and
consequential losses and any loss of earnings, loss of business, or losses in relation to stress and inconvenience,
howsoever caused.
34
Unvented Hot Water Cylinder
Claims
Defects should be reported to us as soon as you are aware of them. Please report defect to us by contacting 03444
8711535 or [email protected] .
Notes
We are only able to carry out warranty repair/replacement to MEGAFLO solar collectors which have safe access and
that meet current Health & Safety working at heights requirements. The customer will cover the cost of any safety
equipment including but limited to scaffolding and lifting equipment that is required to meet this standard and will
appoint a contractor to carry this work out.
Heatrae Sadia accepts no liability for any third party damage.
These warranties do not affect your statutory rights and remedies in relation to the MEGAFLO products.
Annual service
Annual services are available from Baxi Customer Support, the service division of Heatrae Sadia.
Please contact Baxi Customer Support on 0844 871 1535 for details.
*In domestic† properties, lifetime is the period during which the first owner of the MEGAFLO or new build home
continues to own the property. Should the property be sold, the new owner and any subsequent owners will receive a
30 year warranty from the date the original owner purchased the MEGAFLO or new home with a MEGAFLO installed.
In non-domestic properties lifetime is a period of 30 years from the date of purchase by the original owner and is
transferable to any new owner of the property.
†Domestic is any premises not being, or ever having been, wholly or partly utilised for business purposes.
^Non-domestic premises are any premises other than those defined as Domestic.†
All MEGAFLO warranties are conditional on the installation being carried out in accordance with the installation
instructions supplied with the product. These warranties do not affect your statutory rights. Full terms and conditions of
these warranty packages are available on request or via www.heatraesadia.com/megaflo
Heaatrae Sadia*, Hurricane Way, Norwich, Norfolk, NR6 6EA
MEGAFLO may introduce modifications to their products from time to time. Consequentially the details given in this
brochure are subject to alteration without notice.
Contacts
Specification Advice Hotline
T: 01603 420220
F: 01603 420229
E: [email protected]
www.heatraesadia.com
* Heatrae Sadia is a trading name of Baxi Heating UK Limited, Brooks House, Coventry Road, Warwick, CV34 4LL
July 2015
Unvented Hot Water Cylinder
35
Customer service
Telephone:
0344 8711535
Facsimile:
0344 8711528
E-mail:
[email protected]
Megaflo
Hurricane Way
Norwich
Norfolk
NR6 6EA
36006204_issue_02
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