Grant Duowave Plus Cylinder manual - DOC77 - Rev03

Grant Duowave Plus Cylinder manual - DOC77 - Rev03
Storage Cylinder
Grant DuoWave Plus System
Unvented and Open Vented Triple Coil Solar Cylinder Range
Installation & User Instructions
Part No. DOC 77. Rev 03. January 2011
Contents
1
2
3
Contents
4
2
Introduction &
General Requirements
3
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
3
3
3
3
3
4
4
4
4
4
4
4
Installation Requirements
Water Supply Requirements
Location
Storage and Handling
About Your New Cylinder
Unvented Hot Water Systems
Open Vented Hot Water Systems
Taps and Fittings
Pipework Connections
Scaling
Insulation
Health and Safety
5
Technical Specifications
4
2.1
2.2
2.3
4
5
6
Technical data
Dimensions
Connections and Controls
Primary Circuit Installation
8
3.1
3.2
3.3
3.4
3.5
3.6
8
8
8
8
8
8
Grant DuoWave Plus Cylinders
Systems
Boiler Primary Connections
The 2-Port Valve
Auxiliary Primary Connections
Hard water areas
Secondary Circuit Installation
Unvented Cylinder
4.1 Cold Water Inlet Manifold
4.2 Installation
4.3 Expansion Vessel
4.4 Temperature and Pressure Relief Valve
4.5 Hot Water Supply
4.6 Prevention of Scolding
4.7 Prevention of Excessive Temperatures
4.8 Secondary Return
4.9 Tundish
4.10 Discharge Pipe
4.11 Discharge Pipe Arrangement
4.12 Discharge Pipe Sizing
4.13 Worked Example
9
9
9
9
9
9
9
9
10
10
10
11
11
11
Unvented Cylinder
4.14 DuoWave Plus 300
12
4.15 Cold Water Storage Cistern (CWSC)
12
4.16 Cold Feed Pipe
12
4.17 Open Vent Pipe
12
4.18 Primary Connections
12
Electrical Installation
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
6
Commissioning, Draining
Down & Safety
6.1
6.2
6.3
6.4
6.5
6.6
6.7
7
Servicing & Maintenance
Manifold Assembly
Pressure Reducing Valve
Expansion Relief Valve Cartridge
Expansion Vessel
Fault Finding
8.1
8.2
8.3
8.4
8.5
9
Filling the Cylinder
Draining Down
Safety Cut-Out
Cold Water Discharge from Tundish
Hot Water Discharge from Tundish
Expansion Vessel
Customer Handover
Maintenance
7.1
7.2
7.3
7.4
7.5
8
Immersion Heater
Immersion Heater Wiring Instructions
Dual Thermostat
2-Port Valve
W-plan System
Y-plan System
S-plan System
Solar Thermal System
Intermittant Water Discharge
Constant Water Discharge
No Flow from Hot water Taps
Cold Water Flow from Hot Water Taps
Excessive Hot Water from Taps
Spare Parts
9.1
Spare Parts
10 User Instructions
10.1 User Instructions
11 Warranty
11.1 The Grant Cylinder Warranty
11.2 Extended Warranty
13
13
13
13
13
14
15
16
17
18
18
18
18
18
18
18
18
19
19
19
19
19
19
20
20
21
22
23
24
25
25
26
26
26
26
27
1 Introduction & General Requirements
1.3 Location (All models)
Thank you for purchasing a Grant
unvented hot water storage cylinder
from our Wave range. This installation
manual must be read carefully before
you begin installing the cylinder.
The unit is designed to be floor
standing, vertically mounted, indoors,
in a frost-free environment. When
choosing a suitable location for the
cylinder, consideration should be given
to the routing of the discharge pipe to a
convenient point and also the availability
of an adequate power supply for
connecting the immersion heater(s).
The Grant DuoWave Plus Solar
cylinder is available in two versions.
One suitable for use with Open
Vented hot water systems and the
other for Unvented Hot water
Systems. It is vitally important that
you have the correct cylinder to suit
your application and fully read and
understand the instructions
applicable to that type of installation.
If you are in any doubt, stop and
contact the Grant Technical helpline
for assistance.
This cylinder must be installed by a
competent person in compliance with
all current legislation, codes of practice
and local by-laws covering the
installation of an unvented or open
vented hot water cylinder, as applicable.
Please also make sure that any
installation complies with the
instructions contained in this installation
instruction manual.
1.2 Water Supply
Requirements (Unvented only)
We recommend that your Grant
Unvented cylinder is installed with an
uninterrupted water supply.
Where possible the unit should be fed
via a Ø22mm supply pipe. It requires a
supply pressure of 1.5bar with a flow
rate of at least 20 litres per minute as a
minimum for it to function. Even with
these rates, flow from the outlets will be
disappointing if several outlets are used
simultaneously. Generally speaking, the
higher the supply pressure, the better
the system will function. The cylinder
control equipment is factory set to limit
the system operating pressure to 3bar.
The maximum supply pressure into the
pressure-reducing valve is 12bar.
The cylinder may stand on any flat and
level surface without any special
foundation preparations, provided that
it is sufficiently robust to support the full
weight of the cylinder. (Refer to
Technical specifications for weights).
The position of the cylinder should be
such that easy access is provided for
servicing the controls and replacing the
immersion heater should the need arise.
Generally, pipe runs should be made as
short as possible and lagged to prevent
heat loss.
1.4 Storage and Handling
If the cylinder is not being installed
immediately, it should remain in its
carton to prevent damage. We
recommend that the cylinder be
transported to its installation position
on a sack truck or similar whilst still
within the carton.
1.5 About Your New Cylinder
The DuoWave Plus cylinders have three
coils for connection to Primary heat
sources and are available in two
versions:
DuoWave Plus 300 – for Open Vented
hot water system applications
DuoWave Plus 300U – for Unvented hot
water system applications
Both versions are supplied fitted with a
single 3kW electric immersion heater.
Refer to page 13 for further details on
immersion heaters.
The central heating primary from a
‘conventional’ boiler should be
connected to the top 22mm coil, via
the compression connections provided.
The bottom coil should be used for the
Solar Thermal. A Solid Fuel or Wood
burning appliance should be connected
to the middle coil, via the 28mm
compression connections provided.
Please refer to the appliance
manufacturers installation instructions
for more information.
For the unvented version, each coil
must be connected using a 2-port
motorised valve to shut off the flow
from the primary source and electrically
locked with the heat source via the
cylinder control and limit thermostat.
For solar installations a high
temperature 2-port or solenoid valve
must be used. Contact Grant UK for
details.
Failure to do so will invalidate all
warranties and will be in breach of The
Building Regulations Approved
Document G3 (2010).
More information on electrical wiring is
given on pages 13-17.
If an ‘uncontrolled’ heat source such
as a solid fuel or wood burning
appliance is to be connected, along
with a ‘conventional’ boiler and Solar
thermal, the Open Vented version of
the DuoWave Plus cylinder must be
used.
Under no circumstances can an
‘uncontrolled’ solid fuel or wood
burning appliance be used with the
Unvented version of the DuoWave
Plus. No attempt should be made to
control such an appliance by any
means (e.g. a motorised valve) where
to do so may restrict the appliance
path through either the filling pipe
and/or the Open Safety Vent pipe.
If you are in doubt, please seek advice
from The Grant Technical helpline or the
appliance manufacturer.
This type of appliance should be
connected to the 28mm middle coil via
the compression connections provided.
Introduction &
General Requirements
1.1 Installation Requirements
3
1 Introduction & General Requirements
1.6 Unvented Hot Water
Systems (using Model PLUS300U)
In all cases, each coil must be connected
using a 2-port motorised valve to shut
off the flow from the primary source and
electrically interlocked with the heat
source via the cylinder control and limit
thermostat. For the solar installation a
high temperature valve must be used contact Grant UK for details.
Failure to do so will invalidate all
warranties and will be in breach of The
Building Regulations Approved
Document G3 (2010).
More information on electrical wiring is
given on pages 12-15.
1.7 Open Vented Hot Water
Systems (using Model PLUS300)
The cylinder is used as part of an Open
Vented hot water system, i.e. fed from a
cold water storage cistern and fitted
with an open vent pipe. The maximum
head must not exceed 30m.
On no account should any type of valve
be fitted where it would shut off the
boiler from any means of expansion for
the system.
Note: The Temperature and Pressure
relief (T&P) valve should be left
connected to the cylinder (as supplied).
As it may still operate due to
temperature it should be connected in
the correct manner – refer to guidance
given in Section 4 of these Instructions.
1.8 Taps and Fittings
All taps and fittings incorporated in the
unvented system should have a rated
operating pressure of 7 bar or above.
1.9 Pipework Connections
Introduction &
General Requirements
All Pipework connections to the cylinder
must be made in accordance with
Figure 2-2.
4
1.10 Scaling
In hard water areas scaling will form
inside the cylinder and this will reduce
both the performance and working life
of the cylinder. Where the total
hardness exceeds 125ppm a high
capacity water softener, or suitable
water conditioner, should be installed in
the incoming cold water supply to the
cylinder.
It is recommended that the water
temperature control thermostats (on the
immersion heaters and dual
thermostats) fitted to the cylinder be set
no higher than 60°C to minimise scale
build up.
1.11 Insulation
All Grant Cylinders are insulated with
40mm thick CFC/HFC free, fire
retardant, polyurethane foam injected
between the stainless steel cylinder and
the outer casing. This polyurethane
foam has a Global Warming Potential
(GWP) of less than 3 and an Ozone
Depletion Potential (ODP) of 0.
1.12 Health and Safety
The information supplied in the table in
Section 2 Technical Specification will
help you assess the safest way to
manoeuvre your cylinder into position.
Please use the table to find the empty
weight of your cylinder and then
consider how you can safely move it
into its final position.
Please leave this manual with the
householder after installation.
2 Technical Specifications
2.1 Technical Data
DuoWave Plus
Model Number
300U
300
Storage capacity (litres)
300
300
Overall diameter (mm)
580
580
Overall height (mm)
1745
1745
Weight empty (kg)
57
57
Weight when full (kg)
357
357
Secondary return connection (mm)
22
22
Cold feed/hot draw-off connections (mm)
22
22
Top/bottom coil connections (mm)
22
22
Top/bottom coil pipe diameter (mm)
22
22
Middle coil connections (mm)
28
28
Middle coil pipe diameter (mm)
28
28
Top coil length (m)
5.84
5.84
Top coil surface area (m²)
0.52
0.52
Middle coil length (m)
5.70
5.70
Middle coil surface area (m²)
0.52
0.52
Bottom (solar) coil length (m)
8.01
8.01
Bottom (solar) coil surface area (m²)
1.14
1.14
Dedicated solar volume Vs (litres)
150
150
Maximum water supply pressure (bar)
12
3
System operating pressure - pre-set (bar)
3
N/A
Expansion vessel charge pressure (bar)
3
N/A
Expansion relief valve pressure (bar)
6
N/A
Temp & pressure relief valve lift pressure (bar)
7
7
Temp & pressure relief valve lift temperature (°C)
90
90
Maximum primary circuit working pressure (bar)
3
3
11.6
11.6
Performance:
Top coil rating (kW)
Top coil recovery rate (mins)*
26
26
Middle coil rating (kW)
8.5
8.5
Bottom coil rating (kW)
16.0
16.0
Standing heat loss (kW)**
2.71
2.71
1
1
Cylinder assembly 300 litre
Expansion vessel 24 litre
1
N/A
Expansion vessel hose (3/4" BSPF x 3/4" BSPM) c/w washer
1
N/A
Expansion vessel wall bracket and band
1
N/A
Temp & pressure relief valve (7 bar 90ºC) factory-fitted
1
1
Tundish 15/22mm
Drain cock (1/2" end feed)
Inlet manifold (3 bar pressure reducing valve & 6 bar exp. relief valve)
1
1
1
1
1
N/A
2-port motorised valve 22mm
1
N/A
Dual thermostat (Control 25-65ºC High limit 90ºC)
2
2
Immersion heater 3 kW (13/4" boss) factory-fitted
1
1
Technical
Specifications
Check list:
* Recovery rate is based on 82°C flow @0.2 l/s over a 50˚C temperature rise for 75% of contents.
** Test carried out at 60˚C.
5
2 Technical Specifications
2.2 Dimensions
40˚ 30˚
0˚
30˚
22mm Hot water
draw off
1/2" T & P Relief
valve (factory fitted)
22mm Secondary
return
22mm Boiler
return
Boiler stat pocket
22mm Boiler flow
28mm Gravity flow
Immersion heater
(factory fitted)
28mm Gravity return
22mm Solar return
Solar stat pocket
M
L
K
J
I
H
G
F
E
D
C
B
22mm Solar flow
A
22mm Cold water
inlet
Figure 2-1: DuoWave Plus indirect solar cylinder dimensions
DuoWave Plus Indirect Cylinder Dimensions
Technical
Specifications
Dims
(mm)
6
300U
Model
300
Dims
(mm)
A
210
210
B
260
260
C
325
D
390
E
F
G
Model
300U
300
H
1160
1160
I
1210
1210
325
J
1225
1225
390
K
1470
1470
470
470
L
1695
1695
970
970
M
1745
1745
1110
1110
Dia
580
580
Dia
2.3 Connections and Controls
DuoWave Plus Unvented & Open Vented Cylinder Details
14
15
1
16
Item
Description
Connection Size
1
DHW Out
22mm compression
2
T & P valve connection
1/2"
3
Boiler return tapping
22mm compression
4
Secondary return tapping
22mm compression
5
Boiler dual thermostat pocket
-
6
Boiler flow tapping
22mm compression
7
Solar heat source return
tapping
22mm compression
8
Solar heat source dual
stat pocket (for dual stat only)
-
9
Cold water inlet
22mm compression
10
Solar heat source
flow tapping
22mm compression
Immersion heater c/w control
& limit thermostat (factory-fitted)
13/4" BSPF
12
Solid fuel (uncontrolled)
flow tapping
28mm compression
13
Solid fuel (uncontrolled)
return tapping
28mm compression
14
Pressure reducing valve - 3 bar*
-
15
Balanced cold supply connection*
22mm compression
16
Expansion relief valve - 6 bar*
15mm compression
17
Temperature & Pressure relief
valve - 90°C/7 bar
15mm compression
18
Tundish
15/22mm compression
19
Discharge pipe
(not supplied with cylinder)
-
Mains water supply pipe
(not supplied with cylinder)
-
Drain cock
(supplied with cylinder)
-
17
2
4
3
18
5
11
6
20
19
11
12
13
7
20
8
10
9
21
21
BSPF
*Supplied with Unvented version only.
Note:
Pipework between items 17 and 18 not supplied with cylinder.
Technical
Specifications
Figure 2-2: Cylinder connections and controls
7
3 Primary Circuit Installation
3.1 Grant DuoWave Plus Solar
Cylinders
Grant DuoWave Plus Solar cylinders are
suitable for connecting to most fully
pumped domestic gas or oil fired
central heating boilers working on an
open vented or sealed system having a
maximum working pressure of 3 bar
and a maximum working temperature of
90˚ C. If you are in any doubt
concerning the suitability of the boiler,
consult the boiler manufacturer.
Solid fuel or wood burning boilers,
and gravity circulation systems must
not be used on the primary circuit of
an unvented hot water system. The
open vented version of the DuoWave
Plus MUST be used with these
appliances and systems.
3.2 Systems
If an existing system is a “flow share”
arrangement such as an “S” or “Y”
plan type system, (see Figures 5-4
to 5-6) they will provide satisfactory
results, but during central heating
demands, hot water production will
not be as responsive. If this is important,
consider the use of a“W” plan type
system. (See Figures 5-2 and 5-3).
3.3 Boiler Primary Connections
Central Heating
1. The boiler primary flow and return
connections should be made to the
top coil connections. On the
unvented cylinder the motorised
valve (supplied) must be fitted into
the primary flow. The primary flow
and return fittings are 22mm
compression. The valve has 22mm
compression connections.
accordance with Figures 5-3, 5-5 or
5-7 (depending on system design) to
comply with current legislation.
3.5 Auxiliary Primary
Connections
Solar Heating
The Solar flow and return connections
should be made to the bottom 22mm
coil connections. Refer to Figure 5-8. If
the bottom coil is not thermostatically
controlled a two port valve (high
temperature rated - not supplied) must
be fitted in the flow and be controlled
from the dual thermostat mounted at
low level on the cylinder, via the three
port pocket (8). Contact Grant UK for
details.
Other Heat Sources
uncontrolled appliance (e.g wood
burning stove, multi fuel stove, etc.) to
the unvented version of the DuoWave
Plus. Use only the open vented version
of the cylinder for this application.
Figure 3-1 shows a typical installation of
an uncontrolled appliance (a solid fuel
boiler) on an open-vented heating
system, and the connections to the
open-vented version of the DuoWave
Plus Cylinder.
IMPORTANT. This diagram is shown
as an Illustration of this type of
system only. Reference must be
made to the appliance
manufacturers own instructions for
detailed guidance on the installation
of any uncontrolled appliance.
3.6 Hard Water Areas
A third primary heat source should be
connected to the middle coil using the
28mm compression connections.
Please refer to the installation manual
for that appliance.
Please refer to the installation manual of
that appliance. Do not connect an
If the cylinder is to be used in a hard
water area, we recommend that the
primary flow temperature be limited to
75˚ C. This will help reduce the
migration of suspended solids in the
water and help prevent the build up of
lime scale.
Feed and
expansion
cistern
Radiator on landing
Grant open
vented
DuoWave
Plus cylinder
Primary Circuit
Installation
2. Locate the dual thermostat in the
stainless steel pocket (refer to
Figure 2-2 for location) and secure
using the retaining screws on the
thermostat housing.
8
3. Any automatic or manual air vent
fitted to vent air from the upper coil
should be installed on the primary
flow pipe to the coil.
Solid fuel
burning
appliance
Radiator in centre of
ground floor
3.4 The 2 Port Valve
(Unvented only)
To prevent gravity circulation when the
boiler switches off, the 2-port motorised
valve supplied with the unvented hot
water kit, must be fitted in the primary
flow pipe to the cylinder and wired in
Figure 3-1: Typical installation of an uncontrolled appliance
4 Secondary Circuit Installation
Unvented Cylinder
This manifold contains a pressure
reducing valve (with integral strainer),
double check valve, expansion valve
with a stainless steel seat. The pressure
reducing valve is factory set. The set
pressure is shown on top of the valve.
Maximum inlet pressure to valve is 12
bar.
4.2 Installation
1. Cold water supply to be 22mm
nominal size.
2. 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
the warranty. Once the pipework
is flushed connect the cold
supply to the Inlet manifold.
3. The manifold can be installed in any
position as long as it is installed in
the correct flow direction. Refer to
the arrows on the side of the body.
Make sure that the head of the
expansion relief valve is offset from
the cylinder for ease of access.
4. The expansion relief valve should be
either horizontal or upright - if fitted
inverted, debris may be deposited
on the seat and cause fouling of the
seat when the valve operates.
Check direction of flow arrows.
5. The black plastic plug in the body is
a pressure gauge connection to
enable pressure monitoring to be
carried out, should the system
develop a fault. It is recommended
that this be accessible.
6. Expansion relief drain pipework
must be connected to a safe visible
discharge point via a tundish and
the pipework must have a
continuous fall. Connect the
Expansion Relief valve outlet into
the discharge pipe from the
Temperature and Pressure Relief
valve using a 15mm copper pipe
and tee piece (not supplied). Fit the
Tundish below this tee piece using
a short length of copper pipe. Refer
to Sections 4.7, 4.8 and 4.9 for
further information on Tundish and
Discharge pipe.
7. The pressure reducing valve has
two outlets, the second one is for a
balanced cold water supply, to a
shower or a bidet (over rim type
only, ascending spray type
requires type AA, AB or AD air
gap). Major shower manufacturers
advise fitting a mini expansion
vessel in the balanced cold
supply to accommodate thermal
expansion and prevent tightening
of shower controls. If the
dwelling has a shower mixing
valve (manual or thermostatic) or
a Bidet (over rim type) use the
cold water supply from the
Balanced Cold water connection
on the Inlet Manifold for these
outlets. Do not use the balanced
cold connection to supply bath
taps as this can reduce the flow
of water available to the cylinder.
If the balanced cold water outlet is
not required, blank off the port.
The Benchmark book enclosed with
the cylinder should be completed
after commissioning of the system
The cylinder must be registered
with Grant UK within 30 days of
installation. Refer to Section 11 for
further details on the Cylinder
Warranty.
4.3 Expansion Vessel
A suitable expansion vessel with a precharge pressure of 3bar is supplied for
fitting to all cylinders.
The supplied expansion vessel must be
connected into the cold water supply
between the expansion relief valve (in
the inlet manifold) and the cylinder
using the flexible hose provided. The
expansion vessel must be positioned
with the entry point at the bottom. No
valve should be fitted between the
expansion vessel and cylinder.
The air charge pressure in the
expansion vessel must be regularly
checked (e.g. at every service) and
topped up as necessary. The correct air
charge pressure is 3.0bar.
Refer to Sections 7.1 and 7.5 for further
details.
4.4 Temperature and Pressure
Relief Valve
The temperature and pressure relief
valve (T&P Valve) is supplied factory
fitted to the cylinder. The T&P valve
must not be removed from the cylinder
or tampered with in any way. The valve
is pre-set to lift at 7bar or 90°C and
any attempt to adjust it will invalidate
the warranty.
4.5 Hot Water Supply
Connect the hot water supply pipe to
the top outlet (1) of the cylinder.
4.6 Prevention of Scalding
Building Regulations Approved
Document G (Part G3) requires that the
hot water temperature supplied to a
bath should be limited to a maximum of
48°C by using an in-line blending valve
(not supplied with the cylinder) with a
maximum temperature stop. The length
of the supply pipe between the
blending valve and the bath hot water
outlet should be kept to a minimum to
prevent the colonisation of waterborne
pathogens (e.g. legionella). Refer to
Approved Document G for further
details.
4.7 Prevention of Excessive
temperature
Building Regulations Approved
Document G (Part G3) requires that
where the operating temperatures of
domestic hot water in a storage vessel
is capable of exceeding 80°C (under
normal operating conditions), e.g. when
an ‘uncontrolled’ solid fuel boiler is
connected, the outlet of the storage
vessel should be fitted with a device,
such as a tempering valve, to ensure
water temperature supplied to the
domestic hot water distribution system
does not exceed 60°C. This valve (not
supplied with the cylinder) should be in
accordance with BS EN15092:2008.
Secondary Circuit
Installation
4.1 Cold Water Inlet Manifold
9
4 Secondary Circuit Installation
Unvented Cylinder
4.8 Secondary Return
All DuoWave Plus solar cylinders are fitted with a secondary return connection. If a secondary return circuit is required it should be
connected to the DuoWave Plus cylinder as shown below:
Cold inlet
Balanced cold supply for showers
or bidet only (see Section 3.6, 4.2.7)
Secondary
return line
Circulation
pump
Non return
valve
Balanced cold
supply outlet
Figure 4-1: Secondary Return Circuit
Note:
If a secondary circulation circuit is installed
then a larger expansion vessel may be
required to handle the increase in volume.
4.9 Tundish
The tundish must not be positioned
above or in close proximity of any
electrical current carrying devices or
wiring.
4.10 Discharge Pipe
Secondary Circuit
Installation
1. The discharge pipe from the
Tundish should terminate in a safe
place where there is no risk to
persons in the vicinity of the
discharge, be of metal and:
10
a) Be at least one pipe size larger than
the normal outlet size of the safety
device unless its total equipment
hydraulic resistance exceeds that of
a straight pipe 9m long, i.e.
discharge pipes between 9m and
18m equivalent resistance length
should be at least larger than the
normal outlet size of the safety
device, between 18m and 27m at
least three sizes larger and so on.
Bends must be taken in to account
in calculating the flow resistance.
See Sections 4.11, 4.12 and 4.13.
b) Have a vertical section of pipe at
least 300 mm long, below the
tundish before any elbows or bends
in the pipe work.
c) Be installed with a continuous fall of
1:40 (2.5˚).
d) Have discharges visible at both the
tundish and the final point of
discharge but where this is not
possible or practically difficult there
should be clear visibility at one or
other of these locations.
2. Examples of acceptance discharge
arrangements are:
a. ideally below a fixed grating and
above the water seal in a trapped
gully.
b. downward discharges at a low
level; i.e. up to 100mm above
external surfaces such as car parks,
hard standings, grassed areas etc.
are acceptable providing that where
children may play or otherwise
come in to contact with discharges,
a wire cage or similar guard is
positioned to prevent contact,
whilst maintaining visibility.
c. discharges at high level; e.g. in to
metal hopper and metal down pipe
with the end of the discharge pipe
clearly visible (tundish visible or not)
or onto a roof capable of
withstanding high temperature
discharges of water and 3m from
any plastics guttering systems that
would collect such discharges
(tundish visible).
3. Where a single pipe serves a
number of discharges, such as in
blocks of flats, the number served
should be limited to not more than
6 systems so that any installation
can be traced reasonably easily.
The single common discharge pipe
should be at least one pipe size
larger than the largest individual
discharge pipe to be connected.
If unvented hot water storage
systems are installed where
discharges from safety devices may
not be apparent i.e. in dwellings
occupied by blind, infirm or disabled
people, consideration should be
given to the installation of an
electronically operated device to
warm when discharge takes place.
Note:
The discharge will consist of
scalding water and steam. Asphalt,
roofing felt and non-metallic
rainwater goods may be damaged
by such discharges.
4.11 Discharge Pipe Arrangement
4.13 Worked Example
The example below is for a 1/2”diameter
temperature relief valve with a
discharge pipe (D2) having 4 elbows
and a length of 7 m from the tundish to
the point of discharge.
Safety device ( e.g.
temperature relief valve)
Metal
discharge
pipe from
temperature
From
Maximum resistance allowed for a
straight length of Ø22mm copper
discharge pipe (D2) from a 1/2” diameter
temperature relief valve is - 9.0m.
300mm min
600mm max
Tundish
discharged below
fixed grating
Fixed grating
Metal discharge pipe from tundish
with continuous fall. See table and
worked example on next page
Subtract the resistance for quantity of 4
Ø22mm elbows at 0.8m each = 3.2m.
Therefore, the maximum 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 Ø28mm-pipe (D2)
from a 1/2” diameter temperature relief
valve equates to - 18m.
Subtract the resistance for a quantity of
4 Ø28mm elbows at 1.0 each = 4m.
Therefore the maximum permitted
length equates to 14m.
Trapped gully
As the actual length is 7m, a Ø28mm
diameter copper pipe will be
satisfactory.
Figure 4-2: Typical discharge pipe arrangement
Minimum size of
discharge pipe D2 from
tundish in (mm)
Max resistance allowed,
expressed as a length Resistance created
of straight pipe, i.e. no by each elbow or
elbows or bends
bend in (m)
Valve outlet size,
diameter (inches)
Minimum size of
discharge pipe D1 (mm)
1/2
15
22
28
35
Up to 9
Up to 18
Up to 27
0.8
1.0
1.4
3/4
22
28
35
42
Up to 9
Up to 18
Up to 27
1.0
1.4
1.7
1
28
35
42
54
Up to 9
Up to 18
Up to 27
1.4
1.7
2.3
Secondary Circuit
Installation
4.12 Discharge Pipe Sizing
11
4 Secondary Circuit Installation
Open Vented Cylinder
4.14 DuoWave Plus 300
The Grant DuoWave Plus 300 Open
Vented Indirect Solar cylinder is
designed to be used as part of a static
Open Vented hot water system. It
should be installed in accordance with
BS6700:2006, The Building Regulations
Part L and also the relevant Water
Regulations – i.e. the Water Supply
(Water Fittings) Regulations 1999 or the
Water Byelaws 2000, Scotland.
Important: This open vented version
of the DuoWave Plus MUST be used if
an ‘uncontrolled’ heat source such as
a solid fuel or wood burning appliance
is to be connected to the cylinder,
along with a ‘conventional’ boiler and
Solar Thermal or heat pump.
The maximum working head for the
Grant DuoWave Plus Solar cylinder is
30m. Ensure that this is suitable for
your installation before proceeding. If
you are in doubt about the suitability of
the cylinder for the system and
appliances concerned then please
contact the Grant Technical Helpline for
assistance.
Figure 4-1 shows the installation of the
DuoWave Plus 300 Indirect Solar
cylinder installed as part of an open
vented hot water system.
4.15 Cold Water Storage
Cistern (CWSC)
Cisterns should be installed in
accordance with BS6700:2006 and also
the relevant Water Regulations – i.e. the
Water Supply (Water Fittings) Regulations
1999 or the Water Byelaws 2000,
Scotland.
If the cistern is used to provide cold
water to the hot water supply only, it
should have a capacity at least equal to
the hot water cylinder it is supplying.
Secondary Circuit
Installation
4.16 Cold Feed Pipe
12
The cold water feed pipe from the
CWSC to the cylinder should be sized
in accordance with BS6700:2006. This
feed pipe should not supply water to
any other fitting.
Connect the cold feed pipe to the cold
inlet connection of the cylinder. Refer to
Figure 2-3.
A service valve (quarter turn lever
operated full-bore valve) should be fitted
in the feed pipe in a convenient and
accessible position, e.g. adjacent to the
cylinder. If required a second service
Cold water
storage cistern
Breather with filter
Vent pipe
Purpose made
fully fitted lid
Insulating jacket
V
Overflow
warning pipe
Mains water
supply pipe
with isolating
stop valve
If feeding a shower cold feed
to cylinder should always be
above cold water down service
pipe to prevent scolding
Ballvalve with
backing plate
Isolating gate valves
close to cistern
450mm
minimum offset
Cold water down service pipe
Cold water feed to cylinder
H
Further isolating gate valves can
be fitted at a more convenient
location if required
Boiler
primary
To cold water outlet points
Solid fuel
primary
V = 0.04H + 0.15
For example if:
H = 5m
V = (0.04 x 5) + 0.15
= 0.2 + 0.15
= 0.35m
or 350mm
Solar
thermal
To hot water
outlet points
Drain cock
Figure4-1: Open vented cylinder
valve can be fitted in the cold water feed
pipe located adjacent to the CWSC.
and cold feed pipe should not be
connected together.
A Drain Cock (DC) must be fitted at the
lowest point of this supply pipe
adjacent to the cylinder to enable
draining of the pipe and cylinder.
Under no circumstances should the
vent pipe from an open vented hot
water cylinder terminate over any
combined feed and expansion cistern
(F&EC) connected to a primary circuit or
any cistern used for the storage and
distribution of wholesome water.
4.17 Open Vent Pipe
The cylinder must be installed with an
Open Safety vent (OSV) pipe. This must
be connected to the hot water outlet on
the top of the cylinder and rise
continuously to terminate over the
CWSC. Refer to Figure 4-1.
There should be an ‘offset’ of at least
450mm in the OSV pipe to reduce the
tendency for thermal circulation and
loss of heat from the vent pipe. Refer to
Figure 4-1.
The OSV pipe must be of an adequate
diameter, the minimum pipe size being
22mm.
Important: The OSV pipe MUST be
permanently open with NO obstructions
(e.g. no valves fitted). The OSV pipe
An OSV pipe should be insulated to
protect it from freezing.
4.18 Primary Connections
The ‘uncontrolled’ heat source should
be connected to the middle coil via the
two 28mm compression connections.
The Solar Thermal primary should be
connected to the bottom coil via the
two 22mm compression connections,
with the Boiler primary connected to
the top coil 22mm compression
connections.
All primary pipework should be
insulated between boiler and cylinder.
5 Electrical Installation
WARNING
This appliance must be earthed.
All electrical wiring must be carried
out by a competent person and in
accordance with the current I.E.E.
Wiring Regulations.
The control equipment supplied will
ensure that the cylinder functions safely.
From an economic and convenience
point of view, it is intended that these
controls operate in conjunction with
other control packages for example “S”,
“W” or “Y” plan type systems, which
incorporate a programmable time clock,
etc.
5.1 Immersion Heater
All cylinders are supplied fitted with one
immersion heater.
The 3kW 230V 50Hz-immersion heater
should be wired in accordance with the
instructions given in Figure 5-1.
The cable must be routed through
the strain relief bush. The control
thermostat is pre-set at approximately
60°C. The immersion heater conforms
to EEC Directive 76/889 for radio
interference and complies with EN
60335-2-73.
Installation and wiring instructions for
the immersion heater are supplied with
each unit. Follow the wiring instructions
connecting the live, neutral and earth as
indicated.
Temperature
control dial
Reset
= Earth (Green/Yellow)
= Live (Brown)
= Neutral (Blue)
Figure 5-1: Immersion heater wiring
connections
d) The BEAB approval certification on
this immersion heater only applies if
a Cotherm TSE rod type thermostats
is used. The temperature setting of
the control thermostat should
always be left in position 4.
IMPORTANT
Before resetting the safety cut-out or
altering the thermostat setting, isolate
electrical supply to the unit prior to
removal of the cover. Investigate and
identify the cause of the cut-out
operation and rectify the fault before
manually resetting the cut-out by
pressing in the reset button. Ensure the
cover to the immersion element is
replaced correctly and the retaining nut
is fitted. Finally switch the mains
electricity supply back on.
5.3 Dual Thermostat (Indirect
Temperature Control)
!
WARNING
The manual re-set high limit
thermostat must not under any
circumstances be bypassed. This
is pre-set to 80°C and to prevent
nuisance tripping the control
thermostat should always be left in
position 4.
5.2 Immersion Heater Wiring
Instructions
a) Ensure the main’s voltage
corresponds to the voltage rating
of the immersion heater as shown
on the rating label on the terminal
cover.
b) The immersion heater is factory
fitted to the cyinder. If the
immersion heater needs to be
replaced it must be fitted to the
cylinder using the gasket provided
on the unit. Use a shaped spanner,
Stillsons or pipe grips should not be
used. The use of sealing compound
is not recommended.
c) Wire the immersion heater in
accordance with the wiring diagram
(Figure 5-1). It should be wired
through a double pole isolator
switch or controller, with a minimum
break capacity of 13 amp having
contact separation of at least 3
mm, using 1.5mm sq. flexible cable,
85°C rubber insulated HOFR
sheathed, to comply with BS 6141
table 8 and must be fully earthed.
Two Dual Thermostats (each a
combined control and high limit
thermostat) are supplied separately with
the unvented hot water safety kit. One
is fitted into the upper sensor pocket in
the cylinder (see Figures 2-3 to 2-8 for
position) to control the operation of the
boiler or heat pump primary coil. The
second is fitted in the lower sensor
pocket to control the operation of the
Solar coil.
The control thermostat has an
adjustment range between 25°C and
65°C, however it is recommended that
it is set to 60°C. The overheat
thermostat incorporated within the dual
thermostat will operate at 90°C.
5.4 2-Port Valve (Indirect only)
To comply with regulations governing
the installation of indirect unvented
cylinders, a 2-port motorised valve
must be fitted in the primary flow to
prevent gravity circulation when the
boiler switches off. The Grant DuoWave
Plus Unvented unit is supplied with a
2-port motorised valve, which will act
as a positive energy cut-out should the
safety cutout operate. Should this
happen the motorised valve will operate
and close down the primary flow to the
cylinder. The valve should be wired in
accordance with Figures 5-3, 5-5,
5-7 or 5-9 depending on system
design, to comply with current
legislation.
This motorized valve will also control
the temperature of the domestic stored
water via the cylinder thermostat, which
is located in the upper dual thermostat.
The unit should be installed on a “W”,
“S” or “Y” plan system as shown in
Figures 5-2, 5-4 and 5-6.
Electrical Installation
!
The unit must be permanently
connected to the electrical supply
through a double-pole isolator. A safety
cut-out is also incorporated within the
thermostat and is factory set to operate
at 80°C ± 5°C.
13
5 Electrical Installation
5.5 ‘W’ Plan System Schematic and Wiring Diagram
Grant DuoWave Plus
Indirect water cylinder
3 port diverter valve (not supplied)
Radiator
2 port zone valve
(supplied for unvented
cylinder only)
Pump
Boiler
Figure 5-2: ‘W’ Plan system schematic
Blue
Green/Yellow
Brown
230V
50Hz
L
N
3 port divert
valve (not
supplied)
E
Room
Thermostat
2 1 3
1
2
High limit
Control
Cylinder Dual
Thermostat
(Top Coil)
C
Blue
Brown
1
2
3
4
5
6
7
8
9
10
N E L
Time controller
Pump
N
Figure 5-3: ‘W’ Plan wiring diagram
2 port
zone valve*
Notes:
1. Orange and grey wires
not required electrically
isolate
L
N
HW
Junction box
HTG
Electrical Installation
C
14
2
1
E
L
Boiler
2. *2 port valve not
required with open vented
cylinder
5.6 ‘Y’ Plan System Schematic and Wiring Diagram
Grant DuoWave Plus
Indirect water cylinder
3 port mid-position valve (not supplied)
Radiator
2 port zone valve
(supplied for unvented
cylinder only)
Pump
Boiler
Figure 5-4: ‘Y’ Plan system schematic
Blue
Blue
Green/Yellow
Brown
Green/Yellow
2 port
zone valve
(supplied)
White
Grey
Orange
230V
50Hz
L
N
Mid position
zone valve
E
Notes:
1. Orange and grey wires
not required electrically
isolate
Room
Thermostat
2 1 3
1
2
High limit
1
2
Con trol
C
2. *2 port valve not
required with open vented
cylinder
C
1
2
3
4
5
6
7
8
9
10
L
N
HTG
HW Off
HW On
Junction box
Time controller
Figure 5-5: ‘Y’ Plan wiring layout
N E L
N
E
L
Boiler
Pump
Electrical Installation
Cylinder Dual
Thermostat (Top Coil)
15
5 Electrical Installation
5.7 ‘S’ Plan System Schematic and Wiring Diagram
Grant DuoWave Plus
Indirect water cylinder
Radiator
2 port zone valve
(supplied for unvented
cylinder only)
2 port diverter valve
(not supplied)
Pump
Boiler
Figure 5-6: ‘S’ Plan system schematic
Blue
Brown
230V
50Hz
L
N
Grey
Blue
Brown
Orange
Orange
Green/Yellow
Green/Yellow
Zone valve
HTG
E
Note:
2 port valve is
required with both
open vented and
unvented cylinders
Grey
Zone valve
DHW
Room
Thermostat
2 1 3
1
2
High limit
2
1
Control
C
C
Cylinder Dual
Thermostat (Top Coil)
16
1
2
3
4
5
6
7
8
9
10
N
Time controller
Pump
E
L
Boiler
L
N
HW
N E L
HTG
Electrical Installation
Junction box
Figure 5-7: ‘S’ Plan wiring layout
5.8 Solar Thermal Schematic and Wiring Diagram
Solar
Collector
Solar Circulating
Pump
Grant GSD1
Controller
Solar Pump
Station
Electrical
Junction Box
Cylinder
Temperature
Sensor
Dual Thermostat
Figure 5-8: Solar thermal schematic
High temperature 2 port
or solenoid valve
(Not supplied)
Grant GSD1 Mk2 Controller
1
2
3
4
5
6
7
8
9
10
N
GND
230V
Sensor
11
12
13
14
15
16
17
18
19
20
21
22
N E L
Solar pump
N E L
230V 3A
fused supply
Collector
sensor
Cylinder
bottom
sensor
L
N
E
Figure 5-9: Solar thermal system typical hydraulic wiring layout
1
2
1
2
High Limit
C ontrol
C
C
Dual thermostat
(Solar coil)
Electrical Installation
Solenoid
valve
17
6 Commissioning, Draining Down & Safety
6.1 Filling the Cylinder
IMPORTANT
Before filling the cylinder check that the
immersion heater has not loosened in
transit. Tighten as necessary using a
shaped spanner. Stillsons or pipe grips
should not be used.
1. Open all hot water taps.
2. Turn on the stop cock.
3. When water flows from all taps
close the taps.
4. Allow system to stabilise for five
minutes.
5. Open each hot water tap in turn to
expel air from the system pipe work.
6. Check for leaks.
7. Manually operate Temperature and
Pressure Relief Valve (17) - Figure
2-2, to ensure free water flow
through discharge pipe. (Turn knob
to left).
6.2 Draining Down
Switch the electrical power off
(important to avoid damage to element).
Isolate boiler from DuoWave Plus unit.
Turn off the cold water supply valve
(stop cock). Open hot water taps. Open
drain (21) - Figure 2-2. The unit will
drain.
6.3 Safety Cut-Out
1. The safety cut-out operates if:
a. Wiring is incorrect.
b. The immersion heater thermostat or
cylinder thermostat fails.
Commissioning,
Draining Down & Safety
c. Thermostat is set too high.
18
2. Remember before resetting the
safety cut-out or altering the
thermostat setting, isolate electrical
supply to the unit prior to removal
of the electrical box lid.
3. Reduce thermostat setting and
press the reset button. After
adjustments are completed, ensure
the lid to the electrical box is
replaced correctly and the retaining
screw is fitted.
4. If the problem persists, please
contact your installer in the first
instance.
6.4 Cold Water Discharge from
Tundish
6.6 Expansion Vessel
(Unvented only)
There are two reasons why cold water
will discharge from the tundish:
1. The expansion vessel is connected
into the cold water supply to the
cylinder using the flexible hose.
1. The pressure reducing valve has
malfunctioned (This will cause a
large volume of water to flow
through the tundish).
2. The Expansion relief valve is letting
by (This will cause a very low
volume of water to flow through
the tundish).
In both cases, identify the defective
component and replace. All repairs
must be carried out by a competent
person.
Note:
No valve should be fitted between
the expansion vessel and the
supply pipe.
2. Ensure that the air charge in the
vessel matches the pressure setting
shown on the pressure reducing
valve.
3. The expansion vessel must be
installed even if an accumulator is
fitted.
6.5 Hot Water Discharge from
Tundish
4. The charge of the vessel must be
checked at every annual service.
There are four reasons why hot water
will discharge from the tundish:
6.7 Customer Handover
1. Thermal cut-out has malfunctioned.
2. The control thermostat has
malfunctioned.
3. The T & P valve is letting by.
4. The expansion vessel has failed or
lost its charge.
In all cases, should a repair be
necessary, the work must be carried
out by a competent person.
Isolate the cylinder from all electrical
supplies before commencing
maintenance work.
1. Complete the Benchmark book
supplied with the Cylinder and leave
it with the User.
2. Explain the operation of the system
to the User, referring to Section 10
of these instructions.
3. In particular, make the User aware
of what to do if water is seen to
flow from either the T&P Valve or
Expansion relief Valve. Refer User to
the Information given in Section 10.
7 Maintenance
1. Servicing and maintenance must
only be carried out by a competent
unvented hot water installer, or by
Grant Engineering (UK) Limited
authorised personnel.
2. Before any work whatsoever is
carried out on the installation, it
MUST first be isolated from the
main’s electricity supply.
!
WARNING
Both the primary and secondary
systems will contain very hot water
that will scald; therefore care should
be taken when opening any joints,
seals or valves.
3. Only use spare parts authorised by
Grant Engineering (UK) Limited. The
use of unauthorised spare parts will
invalidate the warranty.
4. Drain the cylinder – When draining
the cylinder, always switch off the
boiler and the immersion heater
first. Turn off the water supply at the
mains stopcock.
Connect a hose pipe to the drain
cock (see Figure 2-2) and route it to a
convenient gully. Open the drain cock
and all hot taps that are served by the
cylinder. The cylinder may take
several minutes to empty completely.
5. In hard water areas it may be
necessary from time to time to
remove and de-scale the immersion
heater element. Replace the gasket
each time it is removed.
6. Remove the cartridge from the
pressure-reducing valve (PRV).
Check the strainer and if necessary
remove any debris from in front of
it. Replace the cartridge. Refer to
section 7.3 on the right.
7. Check the charge pressure in the
expansion vessel and top up as
necessary. The charge pressure
should be 3.0bar. Refer to section
7.5 on the right.
8. Whilst the hose pipe is connected, the
drain cock open and with the
immersion heater removed, the
cylinder may be flushed out to remove
any debris, sand or lime scale particles
that may have collected in the bottom
by using a further hose pipe
connected to the cold water main.
7.3 Pressure Reducing Valve
(Unvented only)
9. Close the drain cock, disconnect
the hose, refit the immersion heater
and close all hot water taps before
reopening the stopcock. Allow the
cylinder time to fill whilst checking
for any leaks. Release any air from
the system by opening each hot
water tap individually, starting with
the one furthest from the cylinder.
3. Clean the filter mesh and the
cartridge under running water.
10. Manually lift the expansion relief and
temperature and pressure relief
valve one at a time, every 12
months (more frequently in hard
water areas) to prevent debris from
building up behind the valve seat.
Whilst carrying out this operation,
check that the discharge to waste
is unobstructed. Check that each
valve seals correctly when released.
As the valves are pre-calibrated,
they require no further maintenance.
11. Finally switch on the mains
electricity supply to the immersion
heater and the boiler. As the system
heats up, check again for any leaks
and rectify as necessary.
7.2 Manifold Assembly
(Unvented only)
The manifold assembly should not,
under normal circumstance, require any
maintenance. During annual servicing it
may be necessary to inspect and/or
clean the line strainer, the pressure
reducing valve cartridge, expansion
relief valve cartridge. The frequency of
cleaning will depend on the local water
conditions.
1. Isolate the cold water supply.
2. Unscrew the retaining nut of the
valve. The complete operating
mechanism, including the strainer
can be removed.
4. Replace cartridge ensuring that
strainer is correctly located and
reassemble the unit. Pressure
Reducing Valve cartridge and
strainer Part No. GCS07C - 3.0 bar.
7.4 Expansion Relief Valve
Cartridge (Unvented only)
1. Isolate the cold water supply.
2. Remove grub screw (Allen Key
type) from body of valve and
withdraw valve ensuring not to
damage O-ring.
3. Clean valve seat face and seating do not scratch or damage either
seat face or seating.
4. Refit in reverse order. Do not
overtighten. Expansion valve
cartridge Part No. GCS08.
7.5 Expansion Vessel
(Unvented only)
1. Isolate the cold water supply.
2. Open hot water taps.
3. Drain cylinder to below tee piece
take off for expansion vessel flexible
hose.
4. Replace expansion vessel after first
checking the air charge (and hose if
required).
5. Close drain off cock and turn on
cold water supply.
6. When water is flowing freely from
taps close taps.
Maintenance
7.1 Servicing and Maintenance
19
8 Fault Finding Guide
8.1 Intermittent Water Discharge
Intermittent Water Discharge from T & P Valve
Expansion Vessel
Charge Reduced
No
Thermostat Failure
Yes
Immersion Thermostat
Failure
Test Vessel and
Recharge or Replace
No
Primary Cylinder
Thermostat
Yes
Repair or Replace
Immersion Thermostat
Yes
Repair or Replace
Thermostat
Fault Finding Guide
Test for correct operation. If water is still
discharging, contact a competent Engineer
20
No
Faulty T & P
Valve
Yes
Replace T & P
Valve
8.2 Constant Water Discharge
Constant Water Discharge from T & P Valve
Expansion Vessel
Charge Reduced
No
Faulty T & P
Valve
No
Faulty Pressure
Reducing Valve
Yes
No
Yes
Yes
Replace T & P
Valve
Replace Pressure
Reducing Valve
Yes
Yes
Test for correct operation. If water is still
discharging, contact a competent Engineer
Fault Finding Guide
Test Vessel and
Recharge or Replace
21
8 Fault Finding Guide
8.3 No Flow from Hot Water Taps
No Flow from Hot Water Taps
Mains Supply
Disconnected?
No
Mains Supply
Disconnected?
No
Mains Supply
Disconnected?
Yes
Yes
Yes
Open supply valve or
wait for supply to be
reconnected
Clean Line Strainer
Repair or Replace
Thermostat
Yes
Fault Finding Guide
Test for correct operation. If water is still
not flowing, contact a competent Engineer
22
Yes
No
8.4 Cold Water Flow from Hot Water Taps
Cold Water from Hot Water Taps
No
Check and Set Hot
Water setting
Yes
Is Motorised Valve
working?
Yes
Is Boiler working?
No
Is Cylinder Stat
Calling for Heat?
No
Yes
Check Motorised Valve
motor and Micro-switch
No
Has Thermal Cut-Out
Operated?
Yes
Yes
Yes
Check and Reset
Button
No
Check and Replace
Cylinder Thermostat
Test for correct operation. If water is still
cold, contact a competent Engineer
Fault Finding Guide
Is Programmer calling
for Hot Water?
23
8 Fault Finding Guide
8.5 Excessive Hot Water from Taps
Excessive Hot Water from Taps
Is Cylinder Thermostat
set too high?
Yes
Reduce Thermostat
Setting
No
Is System Wiring
correct?
No
Correct Wiring as
per instructions
No
Replace Cylinder
Thermostat
No
Repair or Replace
Motorised Valve Motor
Yes
Is Cylinder Thermostat
Operating?
Yes
Does Motorised Valve
close when Thermostat
is satisfied?
Yes
Repair or Replace
Motorised Valve
Fault. Contact
Engineer
Fault Finding Guide
Test for correct operation. If water is still
cold, contact a competent Engineer
24
9 Spare Parts
9.1 Spare Parts
Figure 9-1: Pressure Reducing Valve
(Cartridge and Strainer) - 3 bar
Figure 9-2: Tundish
Figure 9-4: Expansion Relief Valve
(Complete) - 6 bar
Figure 9-5: Flexible Hose
Figure 9-3: Inlet Manifold including
pressure reducing valve, expansion
relief valve
DuoWave Plus Cylinder Spare Parts
GCS32
Expansion Relief Valve - 6 bar
GCS08
Flexible Hose
1/2"
Figure 9-6: Expansion Vessel
Part No.
Pressure Reducing Valve - 3 bar
3/4"
BSPF x
3/4"
BSPM compression
Temperature & Pressure Relief Valve 90˚C/7 bar
GCS02
GCS09
Tundish - 15mm/22mm compression
GCS10
Coil Control/Limit Thermostat
GCS11
Immersion Heater Element Cotherm type ELE14-IN-800-UNV
GCS30
Drain Cock
GCS14
Immersion Heater Thermostat - Cotherm type TSE
GCS31
Motorised Valve
GCS16
Expansion Vessel 24 litre nominal*
(22 litre actual vol) 3/4" BSPM connection
GCS04
Inlet Manifold c/w 3 bar Pressure Reducing
Valve and 6 bar Expansion Relief Valve
GCS07
*Pre-charged to 3 bar
Spare Parts
Part Name
25
10 User Instructions
10.1 User Instructions
1. Your Grant DuoWave Plus Solar
unvented hot water cylinder has
been designed to give many years
of trouble-free service and is made
from hygienic high grade stainless
steel. Both models include a 3 kW
electric immersion heaters for times
when your central heating is
switched off, during the summer
for instance.
2. The flow temperature of the hot
water can be set to your
requirements on the immersion
heater up to 60°C and the indirect
system dual thermostat up to 65°C.
These temperatures should not be
set any higher otherwise nuisance
tripping of the high limit thermostat
will occur. If you are in any doubt,
these adjustments should be best
left to a qualified electrician.
3. When a hot tap is turned on there
may be a short surge of water, this is
quite normal with unvented systems
and does not mean there is a fault.
4. When you first fill a basin the water
may sometimes appear milky. This
is due to very tiny air bubbles in the
water, which will clear very quickly.
!
WARNING
If water is seen to flow from either the
Temperature & Pressure Relief (T&P
Valve) valve or the Expansion Relief
Valve (EV) on the cylinder seek expert
advice immediately.
If the water is flowing from the T&P
Valve, immediately:
Shut off the electrical supply to the
immersion heater(s)
Shut down the boiler
Switch off ALL other heat sources to
the cylinder e.g. solar, heat pump, etc.
DO NOT SHUT OFF THE WATER
SUPPLY TO THE CYLINDER.
Contact your installer to check the
system.
IMPORTANT
Do NOT tamper with any of the Safety
controls fitted to the cylinder. If you
suspect a fault always contact a
COMPETENT installer who is
QUALIFIED to work on unvented
water cylinders.
11 Warranty
User Instructions
& Warranty
11.1 The Grant Cylinder
Warranty
26
Dear Customer
You are now the proud owner of a
Grant Cylinder from Grant Engineering
(UK) Limited, which has been designed
to give you years of reliable, trouble free
operation.
Grant Engineering (UK) Ltd. guarantees
all electrical and mechanical
components supplied with the cylinder
for a period of two years from the date
of purchase. In addition, the stainless
steel used in the manufacture of the
cylinder is guaranteed for a period of
twenty five years with the manufacturing
process of the cylinder guaranteed for
two years from the date of purchase,
provided that the cylinder is installed in
full accordance with the installation
instructions provided and the system is
serviced after twelve months operation.
(see Terms and Conditions).
Important
Please register your Grant cylinder with
Grant UK within thirty days of the
installation as follows.
Visit www.grantuk.com and follow the
links to the 'Householder zone' where
you can register your cylinder for a
further one year warranty (giving two
years from the date of purchase). This
does not affect your statutory rights.
11 Warranty
In the first Instance:
Contact your installer or commissioning
engineer to ensure that the fault does
not lie with the system or any other
components, or any incorrect setting of
the system controls.
If a Fault is Found:
Ask your installer to contact Grant
Engineering (UK) Limited, Service
Department on 01380 736920 who will
arrange for a qualified service engineer
to attend to the fault.
Free of Charge Repairs:
During the first two years no charge for
parts or labour will be made providing
that the Cylinder has been installed and
commissioned correctly in accordance
with the manufacturer’s instructions,
servised at twelve month intervals and
the cylinder was registered with Grant
UK within thirty days of installation.
Proof of ‘purchase’ date must be
provided upon request.
Chargeable Repairs:
A charge will be made if the cause of
the breakdown is due to any of the
following:
•
Faults caused by the plumbing or
heating system, external electrics
and external components.
•
The Grant Cylinder has not been
commissioned, or serviced in
accordance with the installation
and servicing manual.
•
The system has been installed for
over two years.
Remember before you contact
Grant:
Please register your Grant cylinder
within thirty days of the installation.
Terms of Manufacturer’s Guarantee
1. The Grant Cylinder guarantee starts
from the date of purchase.
2. All electrical and mechanical
components supplied with the
Grant Cylinder are guaranteed for a
period of two years. The stainless
steel used in the manufacture of the
cylinder is guaranteed for a period
of twenty five years with the
manufacturing process of the
cylinder guaranteed for two years.
3. The cylinder is registered within 30
days of installation. Failure to do so
does not affect your statutory
rights.
4. The Grant Cylinder must be installed
by a competent/licensed installer
and in accordance with the Codes of
Practice and Regulations in force at
the time of the installation.
5. The Grant Cylinder and its
components must not have been
modified or tampered with.
6. The installation must be serviced
every twelve months as per the
installation instructions. (Receipts
should be kept as proof).
7. The Grant Cylinder must be
connected to a mains water supply
(installations utilising a private water
supply are not covered by this
guarantee).
8. Breakdown/failure due to lime-scale
will not be covered by this
guarantee.
9. The Grant Cylinder must not be
sited in a location where it may be
subjected to frost.
10. All claims under this guarantee
must be made to Grant Engineering
(UK) Ltd prior to any work being
undertaken. Proof of purchase and
date of installation must be
provided on request. Invoices for
call out/repair work by any third
party will not be accepted unless
previously authorised by Grant
Engineering (UK) Ltd.
11. This guarantee is transferable
providing the installation is serviced
prior to the dwelling’s new owners
taking up residence. Grant
Engineering (UK) Ltd must be
informed of the new owner’s details.
12. Grant Engineering (UK) Ltd will
endeavour to provide prompt service
in the unlikely event of a problem
occurring, but cannot be held
responsible for any consequence of
delay however caused.
13. This guarantee applies to Grant
Cylinders installed on the UK
mainland, Isle of Man and Channel
Islands only. Provision of in-warranty
cover elsewhere in the UK is
subject to agreement with Grant
Engineering (UK) Ltd.
11.2 Extended Warranty
For further peace of mind Grant
Engineering (UK) Ltd offer the option to
insure all the components of your Grant
Cylinder for a further three years,
following on from the two year product
warranty period. For a single premium
payment (inclusive of Insurance
Premium tax) you get five years of
protection against breakdown costs. At
the end of this period you will have the
opportunity to continue this cover on an
annual basis.
To access full details and an application
form for this extended cover, first visit
www.grantuk.com.
Follow the links to the ‘Householder
Zone’, register your Cylinder for a
further one year product warranty
(giving two years from the date of
purchase), and then download the
extended warranty details and
application form.
Please note that this special offer is only
available if the application form is
submitted to Bluefin Insurance Services
Ltd. within three month of the
installation date.
User Instructions
& Warranty
Breakdown during the
Manufacturer’s Warranty
If your Grant Cylinder should fail during
the first two years, you must contact
Grant Engineering (UK) Limited, who will
arrange for the repair under the terms
of their Warranty, providing that the
system has been correctly installed and
commissioned, serviced (if older than
twelve months) and the fault is not due
to misuse, or the failure of any external
components not supplied by Grant UK
(e.g. pipework, etc.). This extended two
year warranty only applies if the cylinder
is registered with Grant UK within thirty
days of installation.
27
GRANT ENGINEERING (UK) LTD
Hopton House, Hopton Industrial Estate, Devizes, Wiltshire. SN10 2EU
Telephone: 01380 736920 Fax: 01380 736991
Email: [email protected] Website: www.grantuk.com
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