Benchmark Accolade ACA125 IND User guide

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DESIGN, INSTALLATION AND
SERVICING INSTRUCTIONS
PLEASE LEAVE THESE INSTRUCTIONS IN THE POCKET PROVIDED ON
THE BACK OF THE FRONT PANEL
TM
benchmark
The code of practice for the installation,
commissioning & servicing of central heating systems
Please read these instructions before
commencing installation.
In the interest of continuously improving the Accolade A Class
range, Gledhill Water Storage Ltd reserve the right to modify the
product without notice, and in these circumstances this booklet,
which is accurate at the time of printing, should be disregarded.
An unvented hot water storage unit complying with the
requirements of Building Regulations Approved Document G3.
Accolade
A-CLASS

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Page 2
Section Page
1.0 DESIGN
1.1 Introduction 3
1.2 Technical Data 6
1.3 System Details 12
2.0 INSTALLATION
2.1 Site Requirements 20
2.2 Installation 21
2.3 Commissioning 29
3.0 SERVICING
3.1 Annual Servicing 32
3.2 Changing Components 32
3.3 Short Parts List 33
3.4 Fault Finding 35
Appendix ‘A’ 36
Appendix ‘B’ 37
Appendix ‘C’ 40
Appendix ‘D’ 41
Terms & Conditions 42
As part of the industry wide “Benchmark” Initiative all Gledhill Accolades now include
a Benchmark Installation, Commissioning and Service Record Log Book. Please read
carefully and complete all sections relevant to the appliance installation. The details
of the Log Book will be required in the event of any warranty work being required.
There is also a section to be completed after each regular service visit. The completed
Log Book and these instructions should be left in the pocket provided on the
back of the front panel.
TM
benchmark
The code of practice for the installation,
commissioning & servicing of central heating systems
ISSUE 1: 12-04
CONTENTS

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Page 3
ACCOLADE A-CLASS
1.0 DESIGN
1.1 INTRODUCTION
The AccoladeA-CLASS range of floor standing
indirectly heated unvented hot water storage
appliances is designed to provide domestic
hot water at mains pressure. All models are
designed for gas or oil fired heating and hot
water systems with boiler capacities up to a
maximum of 45kW. All models are fitted with
a 6kW ‘Switch’ emergency electric backup
system for domestic hot water or heating and
hot water water in the event the boiler fails. The
AccoladeA-CLASS appliances are factory fitted with
all the necessary safety and control equipment
for connecting to the cold water mains, boiler
and heating system.
These instructions cover all the models and
must be followed. These appliances have been
certified for safety and the appliance and
installation specifications of the appliances
must not be modified unless recommended
by Gledhill Water Storage Limited.
SAFETY
1.The Building Regulations (Approved
Document G3) 2002 cover the installation
of unvented storage water heating
equipment and these require that the
installation of an unvented unit shall
only be carried out by a person competent
to do so (as defined in the Approved
Document) and that the Local Authority
shall be notified of the intention to carry
out the installation of one of these types
of appliances.
2.The system must be installed in accordance
with the Water Supply Regulations,
Building Regulations and relevant NHBC
requirements.
3. As the AccoladeA-CLASS is an unvented
appliance it should not be used where
steam is the primary heating medium,
or with solid fuel boilers, or in situations
where annual inspection/maintenance is
likely to be neglected.

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Page 4
1.0 DESIGN
IMPORTANT NOTICES
1. Handling and Storing the Appliance
This appliance should be handled carefully to avoid damage and the recommended
method is detailed below.
When lifting the unit:-
• Use a team lift
• Work with someone of similar build and height if possible.
• Choose one person to call the signals
• Lift from the hips at the same time, and then raise the unit to the desired level.
• Move smoothly in unison.
The appliance is supplied shrink wrapped on a timber installation base. Carrying
handles are provided in the back of the casing.
If the unit needs to be stored prior to installation it should be stored upright in a dry
environment and on a level base/floor.
Note: Although the above guidance is provided any manual handling/lifting
operations will need to comply with the requirements of the Manual Handling
Operations Regulations issued by the H.S.E. See Appendix D at the rear of this
manual.
The appliance can be moved using a sack truck on the left hand face although care
should be taken and the route should be even. In apartment buildings containing a
number of storeys we would recommend that the appliances are moved vertically
in a mechanical lift. If it is proposed to use a crane expert advice should be obtained
regarding the need for slings, lifting beams etc.
2. System Installation
Any installation must be in accordance with the relevant requirements of the
current issue of Local Building Regulations, the Water Supply Regulations, Health &
Safety Document No. 635 and the Electricity at Work Regulations 1989. The detailed
recommendations are contained in the current issue of the following British Standards
and Codes of Practices: -
BS 5440 Pts. 1 & 2; BS 5449; BS 5546; BS 7074
Part 1; BS 6700; BS 6798; BS 6891, BS 7593,
IGE/UP/7/1998
3. Equipment Selection
This information is provided to assist generally
in the selection of equipment. Responsibility
for selection and specification of our equipment
must, however, remain that of our customers
and any expert or consultants concerned with
the installations).
Please note: -
We do not accept any responsibility for
matters of design selection or specification
or the effectiveness of an installation
containing one of our products unless
specifically asked in writing to do so.
All goods are sold subject to our Conditions
of Sale which are set out in the Appendix
to this document.
Warning
To comply with the Building Regulations
requirements this appliance must be
serviced and installed by a competent
person suitably trained and registered
to install unvented heating system
equipment.
As part of the industry wide ‘Benchmark’
initiative all AccoladeA-CLASS appliances
now include a Benchmark Installation,
Commissioning and Ser vice Record
Logbook. Please read this carefully and
complete all sections relevant to this
appliance. Failure to do so may affect
warranty.
Modifications should NOT be made
to this product. If any components
in this appliance are replaced and re-
commissioned in the field then these must
be obtained from Gledhill Water Storage
Ltd to ensure continued safe operation and
must not be tempered with. This applies
particularly to the immersion heaters which
must incorporate an overheat thermostat.
1.1 INTRODUCTION

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Page 5
ACCOLADE A-CLASS
1.0 DESIGN
1. 1 INTRODUCTION
Description
The AccoladeA-CLASS is a floor standing packaged
mains pressure unvented hot water appliance
and uses a twin copper cylinder configuration
which ensures that all the water content is
heated to a uniform temperature as well as
reducing the risk of legionella and corrosion.
All cylinders are manufactured in accordance
with the requirement of BS7206:1990. All
models of the Accolade are factory fitted with
all the necessary safety and control equipment
for connecting to the domestic water systems,
the boiler and the heating system (see table 1.2
and figure 1.1).
All models are designed to be heated indirectly
by a gas or oil fired boiler and are suitable for
use with both open vented and sealed heating
systems. These appliances are also fitted with a
6kW ‘Switch’ emergency electric backup system
in the event of a boiler failure. Two switches on
the front of the appliance allow this to be used
for hot water only or heating and hot water
if required. This should be sufficient in most
cases to satisfy the heating requirements of a
typical property in an average day although
in larger properties and on very cold days a
choice between a lower temperature or the
area to be heated fully will need to be made
(see table 1.1)
All models except ACA125 IND are fitted with
a secondary return tapping as standard. This
is blanked 22mm diameter copper pipe on
the top - right hand - rear of the appliance. If
secondary hot water circulation is installed,
then an additional expansion vessel may be
necessary. Typical primary hot water circulation
system design is discussed further in section 1.3
of this manual.
Table 1.1
Design heating load (kW) 4.0 6.0 8.0 10.0 12.0 14.0
Radiator design output (kW) 4.8 7.2 9.6 12.0 14.4 16.8
Heat output required on design-day (kW) 3.3 5.0 6.6 8.3 9.9 11.6
Heat output required on average winter day (kW) 2.1 3.1 4.2 5.2 6.3 7.3
Radiator output with switch (kW) 2.6 3.9 5.2 5.8 5.8 5.8
Heat load satisfied on design-day (%) 77.9 77.9 77.9 70.2 58.5 50.2
Heating load satisfied on average day (%) 100.0 100.0 100.0 100.0 92.6 79.4

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Page 6
1.0 DESIGN
1.2 TECHNICAL DATA
Table 1.2 Factory fitted and supplied components
Models
ACA125 IND
ACA150 IND
ACA180 IND
ACA210 IND
ACA240 IND
Factory fitted and wired standard equipment (see figure 1.1)
1. Mains pressure inlet control group consisting of Non-return
valve, Pressure regulator, Strainer, Expansion relief valve and
balanced cold water outlet
Yes - Non adjustable factory set operating pressure - 1.5 bar
2. Pressure and temperature (P&T) relief valve Yes - Non-adjustable factory set operating pressures
3. Tundish Yes - 2 No for items 1 and 2
4. Over heat thermostat Yes - manual reset, non adjustable and not accessible to user
5. Control thermostat Yes, Adjustable, not accessible to user
6. Anti-vacuum valve Yes
7. Wiring centre Yes
8. Domestic hot water expansion vessel(s) Yes
9. Hot water zone valve Yes
10.Space heating zone valve Yes
11. System pump Yes
12. Automatic bypass valve Yes
13. Grasslin electro-mechanical clock Yes
14. 6kW switch emergency electrical backup with control and
over heat thermostats Yes - for backup in case of boiler failure
15. Drain cock Yes
16. Ball-o-fix isolation valve Yes
Optional Extras - to be requested at time of order
Sealed System Kit
1. Pressure gauge Yes
2. Primary (heating) circuit expansion vessel Yes
3. Filling loop Yes
4. Expansion relief Yes
Open Vented Kit
1. Feed and Expansion cistern with lid Yes
2. Ball valve and float Yes
3. Over flow and cold feed tank connectors Yes
Grasslin digital clock Yes
No clock Yes
Remote clock fixing kit
SRD Kit (scale inhibitor) Yes
Flexible connection kit Yes
Grundfos UPS 15/60 pump Yes
(125 & 150 only)
Hot and cold manifold sets (1 or 2)

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Page 7
ACCOLADE A-CLASS
1.0 DESIGN
1.2 TECHNICAL DATA
Figure 1.1
Factory fitted components (see table 1.2)
Primary Sealed System Kit
(optional extra)
Open Vented Primary Kit
(optional extra)
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5
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1
14
11
10 15
12
3
3
4
1
3
2
1
2
3
16

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Page 8
1.0 DESIGN
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Figure 1.2 Minimum cupboard dimensions
1. 2 TECHNICAL DATA
Note: The appliance dimensions do not allow
for the 100mm installation base.
Appliance Dimmensions
Model Height (A) Width (B) Depth (C)
ACA125_IND 1080 595 595
ACA150_IND 1140 “ “
ACA180_IND 1370 “ “
ACA210_IND 1600 “ “
ACA240_IND 1950 “ “
The dimensions above are for the Appliance
complete with F & E Cistern (for use with OV
primary/heating systems) being in the same
cupboard.
If the appliance is fitted with a primary
expansion vessel (for use with a sealed
primary/heating systems) 300 mm can
be deducted from the height.
The table of minimum cupboard dimensions
only allow the minimum space required for the
appliance (including the heating system
F & E cistern or expansion vessel and installation
base) and any extra space required for shelving
etc in the case of airing cupboards etc must
be added.
Expansion Vessel Sizes
Model Capacity Size-mm Stock code
ACA125_IND 8 lire 515 x 160 dia TBA
ACA150_IND 8 litre 515 x 160 dia TBA
ACA180_IND 12 litre 290 x 270 dia XG164
ACA210_IND 12 litre 290 x 270 dia XG164
ACA240_IND 18 litre 400 x 270 dia XG009
Minimum Cupboard Dimensions
Model Height (D) Width (E) Depth (F)
ACA125_IND 1830 700 600
ACA150_IND 1890 “ “
ACA180_IND 2120 “ “
ACA210_IND 2350 “ “
ACA240_IND 2700 “ “

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Page 9
ACCOLADE A-CLASS
1. 2 TECHNICAL DATA
Model Selection Guide
General selection criterion is shown in Technical
Data table 2.1. However, before selecting the
model, the hot water requirements of the
dwelling should be correctly assessed.
Appliance Location
The AccoladeA-CLASS must be installed on a flat
surface, which is capable of supporting the
weight of the appliance and any other ancillary
equipment.
The minimum airing cupboard dimensions
and the clearances required for installation
and service are shown in figure 1.2.
The appliance is designed to be installed on the
plinth supplied with the appliance. The pipe
connection arrangement is shown in figure
1.3.
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Figure 1.3 Connection Arrangement - Indirect
1.0 DESIGN

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Electricity Supply
One mains supply rated at 30A, 230V~, 50Hz
is required.
Minimum external fuse rating and the main
supply cable ratings are given in “2.1. Site
Requirements” section of this manual. All
fuses must be ASTA approved to BS 1362. This
appliance MUST BE EARTHED.
All external wiring to the appliance must be
in accordance with the latest I.E.E. Wiring
Regulation, and any local regulations which
may apply.
The appliance shall be supplied from a 30A
fused double pole switched isolator with a
contact separation of at least 3mm in both
poles.
This must be suitably labelled, provide complete
electrical isolation and be within 1 metre of the
AccoladeA-CLASS Unit.
In the event of an electrical fault after installation
of the appliance, preliminary electrical checks
must be carried out i.e. Earth Continuity, Short
Circuit, Polarity, and Resistance to Earth.
Page 10
1.0 DESIGN
1.2 TECHNICAL DATA
a. General technical and performance data of
the AccoladeA-CLASS range is given in table
2.1.
b. All models are fitted with high performance
primary heat exchangers and are supplied
with either Grundfos UPS 15-50 or UPS 15-60
factory fitted pumps. The net pump head
available when hot water only is on and
when space heating only is on is shown in
figures 1.4 and 1.5 respectively. The control
characteristic of the automatic bypass is
shown in figure 1.6.
c. In these appliances the mains inlet pressure
regulating valve is set to 1.5 bar and this
setting MUST NOT be adjusted. Therefore
the flow rate from the appliance depends
upon the resistance of the hot water supply
network, capacity of the incoming mains and
the characteristics of the pressure regulating
valve.
Primary heat exchanger (i.e. coil) pressure loss of Accolade 2000 Models
0
1
2
3
4
5
6
0 10 20 30 40 50 60
Primary heat exchanger circuit flow rate (l/min)
Pressure loss (m.W.G.)
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Heating circuit pressure loss of Accolade 2000 Models
0
1
2
3
4
5
6
0 10 20 30 40 50 60
Heating circuit flow rate (l/min)
Pressure loss (m.W.G)
Figure 1.4 Net pump head available - Hot water only on
Figure1.5 Net pump head available - Heating only on
Figure 1.6 Automatic bypass valve characteristics

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Page 11
ACCOLADE A-CLASS
1.0 DESIGN
1.2 TECHNICAL DATA
Table 2.1 Technical specification of Accolade A-Class
Accolade A-Class Indirect Models
ACA125 IND ACA150 IND ACA180 IND ACA210 IND ACA240 IND
Weight (kg)
Empty 59 72 84 96 118
Full 149 190 229 267 333
Temperature set-point of thermostats (oC)
Control thermostat (CT) 60
OHT 1 80
P&T Valve 90
IH CT (inside heater head) 60
IH OHT (inside heater head) 85
Pressure set point (bar)
Inlet pressure regulator 1.5
Expansion relief valve 3.0
P&T valve 4.0
Primary expansion relief valve 3.0
DHW (potable water) expansion vessel
sizing
Expansion coefficient (%) 4.00
Expansion volume (1) 3.60 4.72 5.80 6.84 8.60
Epansion vessel (1) 8.4 11.1 13.6 16.0 20.1
Primary i.e. heating circuit expansion vessel
sizing
Maximum boiler rating (kW) 15 15 20 25 35
Maximum design heating load (kW) 10.5 10.5 15 19.5 28.5
Water content (litres) 47.25 47.25 67.5 87.75 128.25
Vessel charge pressure (bar) 1.0
Primary exp relief valve setting 3.0
Expansion coefficient (%) 5.0
Expansion vessel (1) 5.53 5.53 7.91 10.28 15.02
Boiler/Heating Circuit
Pump: Grundfos UPS 15-50 (22mm connections) FF-S FF-S FF-S
Pump: Grundfos UPS 15-60 (28mm connections) FF-S FF-S
HTG Zone valve_22mm: Honeywell V4043 with removable head FF-S FF-S FF-S
HTG Zone valve_28mm: Honeywell V404 with removable head FF-S FF-S
Grasslin electro-mechanical clock FF-S
Bypass valve: Comap Automatic-factory set at 2.5 FF-S
Pressure relief valve FK-O
Expansion vessel(s) supplied as part of sealed system kit (FK-O) Zilmet OEM-PRO Rectangular
- charged to 1.0 bar
13N600FG00
(7.5 l)
492x203x118
13N600FG00
(7.5 l)
492x203x118
13N6001000
(10 l)
492x203x150
13N6001200
(12 l)
492x203x170
13Q0001800
(18 l)
445x350x158
Filling loop FK-O
Pressure gauge FK-O
DHW Circuit
Anti-vacuum valve: GT056 FF-S
Combined CT & OHT 1: Honeywell dual Aquastat TS9430.51/04224 FF-S
HW zone valve 22mm: Honeywell V4043 with removable head FF-S FF-S FF-S
HW zone valve 28mm: Honeywell V4043 with removable head FF-S FF-S
P&T valve: Honeywell TP152-3/4ZB set at 4.0 bar and 90oC FF-S
Inlet control group: Honeywell ICS 22mm with PRV set at 3.0 bar, PR set at 1.5 bar FF-S
Tundish(s) FF-S (2 off, For ERV & For P&T valve)
Expansion vessels supplied as part of standard kit (FF-S): Zilmet HYDRO-PRO Circular
- charged to 1.5 bar.
1x8 L
(510842160)
2x8 L
(510842160)
2x8 L
(510842160)
2x8 L
(510842160)
3x8 L
(510842160)
Electric Heating
Immersion heater: reding 3kW Type GU11TC 2 x FF-S (Acting as Switch backup)
IH control thermostat: Integral part of IH 2 x FF-S
IH OHT: Integral part of IH 2 x FF-S
User Controls
Grasslin digital clock FK-O
FF-S: Factory fitted standard item FK-S: Part of factory supplied kit FK-O: Part of factory supplied optional kit

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Page 12
1.0 DESIGN
1.3 SYSTEM DETAILS
Hot and Cold Water System
a. All recommendations with regard to pipe work systems in this manual are generally
based on the use of BS/EN Standard copper pipework and fittings.
b. However a plastic pipework system can be used in place of copper internally as
long as the chosen system is recommended by the manufacturer for use in cold
and hot water systems and is designed and installed fully in accordance with their
recommendations.
c. This is particularly important in relation to use of push fit connections when
using the optional flexible hose kits (See Installation and Wiring section of this
document),
d. It is also important that if an alternative pipework material/system is chosen, the
manufacturer confirms that the design criterion for the new system is at least
equivalent to the use of BS/EN Standard copper pipework and fittings.
Mains cold water supply
a. AccoladeA-CLASS is designed to be connected directly to the mains. The combination
inlet valve incorporates the required check valve. The hot water flow rate
achievable from the AccoladeA-CLASS is directly related to the adequacy of the
cold water mains serving the property. For this reason the cold water supply
to the dwelling must be capable of providing for those services which could be
required simultaneously and this maximum demand should be calculated. Also if
a water meter is fitted its nominal rating should match the anticipated maximum
simultaneous hot and cold water demand calculated in accordance with BS 6700.
This could be 60 litres per minute in some properties. 30 litres per minute is the
minimum flow rate which is recommended for an adequate mains pressure system
to any property.
In accordance with the Benchmark Guidance Notes (See Appendix C) it is
recommended that in areas where the mains cold water can exceed 280ppm
total hardness (as defined by BS 7593: 1993 table 2) a scale reduction device
should be installed. The advice of a specialist water treatment company should
be requested/followed. If requested, a scale reduction device (SRD) can be fitted
as an optional extra at time of order.
b. The combination valve fitted to the AccoladeA-CLASS incorporates a pressure
regulating valve set to provide a static operating pressure of 1.5 bar. On this basis
there must be at least 2.0 bar pressure at the inlet to the appliance. This pressure
must be dynamic (not static) and be available at the appliance when local demand
is at its maximum. For optimum performance, and for larger properties, we would
recommend that the dynamic pressure is in the range of 2.5 - 3.5 bar.

Supplied By www.heating spares.co Tel. [phone]
c. The combination valve also incorporates an expansion relief valve. The discharge
from this can be connected into the discharge pipe from the P & T valve. Further
details of how to treat this discharge are provided later in this manual.
d. As a general guideline, although a 15mm service my be sufficient for smaller
dwellings with one bathroom, a 22mm service (25mm MDPE) is recommended
and should be the minimum for larger dwellings.
e. If the incoming mains pressure exceeds 6 bar at any time in a 24 hour cycle then
a pressure regulating valve set at 3.5 bar should be fitted downstream of the stop
tap where the cold supply enters the property.
f. Equipment used in the system should be suitable for a working pressure of up to 5
bar.
Cold and hot water distribution network
a. As a minimum it is recommended that the cold supply to the appliance internally is
run in 22mm copper or equivalent in plastic and then from the appliance, hot and
cold services are in 22mm past the draw-off to the bath as shown schematically
in figure 2.1. For large properties bigger sizes will be necessary and these should
be proved by calculation in accordance with BS6700.
b. The highest hot or cold water draw-off point should not exceed 4 metres above
the appliance.
 
 
 




 

















   
c. In typical dwellings, the cold water supply
to any mixer fittings (other than dual outlet
fittings) should be taken from the balanced
cold outlet connection on the appliance.
However, in larger dwellings with a number
of bathrooms and en-suites and long pipe
runs, the balanced cold supply must be
provided with its own pressure regulating
valve (set at the same pressure as the one
provided with the appliance ie 1.5 bar
static) and not taken from the appliance.
When a separate pressure regulating valve
is used for the balanced cold water supply,
it is recommended that a small expansion
vessel (0.25 - 0.5 litre) is fitted after the
pressure regulator to accommodate the
pressure rise caused by the increase in
temperature of the balanced cold water.
d. Whenever possible the hot and cold water
supply to a shower-mixing valve should be
the first draw-off point on each circuit.
e. It is important that the cold water pipe work
is adequately separated from any heating/
hot water pipe work to ensure that the
water remains cold and of drinking water
quality.
Figure 2.1 Typical cold and hot water network (to a smaller property)
Cold supplies to single taps taken from the mains cold water system.
Cold supplies to mixer taps only to be taken from the balanced cold water connection on the combination valve.
Page 13
ACCOLADE A-CLASS
1.3 SYSTEM DETAILS
1.0 DESIGN

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Page 14
1.0 DESIGN
1.3 SYSTEM DETAILS
Taps and Shower Fittings
a. Ensure that all terminal fittings are suitable for mains pressure. Use aerated taps
whenever possible to prevent splashing.
b. Any type of shower mixing valve can be used as long as both the hot and cold
supplies are mains fed. However, all mains pressure systems are subject to dynamic
changes particularly when other hot and cold taps/showers are opened and closed,
which will cause changes in the water temperature at mixed water outlets such
as showers. For this reason and because these are now no more expensive than
a manual shower we strongly recommend the use of thermostatic showers with
this appliance.
The shower head provided must also be suitable for mains pressure supplies.
However, if it is proposed to use a ‘whole body’ or similar shower with a
number of high flow/pressure outlets please discuss with the Gledhill technical
department.
c. Note that the shower fittings must comply with the backflow prevention
requirements (Para 15, Schedule 2) of the Water Supply Regulations 1999.
d. A bidet can be supplied from the AccoladeA-CLASS appliance as long as it is of the
over rim flushing type and incorporates a suitable air gap.
 








 
 
 
 
 


Figure 2.2 Schematic diagram of typical secondary hot water circulation
1. Hot flow and return pipework must be insulated
2. All components must be suitable for use on domestic unvented hot water
storage systems
Dead leg volumes and secondary hot
water circulation
If the dead leg volume of the hot water draw-off
pipework is excessive and the delivery time for
hot water to be available at the tap is more than
60 seconds you may consider using:-
a. Trace heating such as the ‘Raychem HWAT’
system. Please call Gledhill technical
department for further details.
OR
b. A secondary hot water circulation system
as shown schematically in figure 2.2.

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Page 15
ACCOLADE A-CLASS
Space Heating System Design
General
Warning: AccoladeA-CLASS is an unvented
hot water storage appliance and therefore
it is not suitable for use with a solid fuel
boiler, steam or any other uncontrolled heat
source.
Model selection
All models are designed to be installed with any
condensing or non condensing gas or oil fired
boiler which has a controlled heat source and
is fitted with an overheat thermostat.
The heating system design and installation
must comply with the requirements of BS
6798 and BS 5449.
Although general model selection guidance
is given in table 2.1 (section 1.2), it is
recommended that the hot water demand
should be determined before selecting the
correct model.
Plastic pipework
All recommendations with regard to pipework
systems in this manual are generally based on
the use of BS/EN Standard copper pipework
and fittings. However plastic pipework can
be used in place of copper internally as long
as it is recommended by the manufacturer
and installed fully in accordance with their
recommendations. Barrier type plastic pipework
should always be used for these systems.
It is important to ensure that if the system
is to be installed using plastic pipework it is
designed and sized for plastic pipework. This is
particularly important in relation to use of push
fit connections to the appliance.
Boiler Sizing
The AccoladeA-CLASS is designed to operate
in a ‘flow share’ mode i.e. the boiler may
supply space heating and hot water demands
simultaneously. Therefore a hot water allowance
should be included when sizing the boiler and
heating system in accordance with BS 5449.
1.0 DESIGN
1.3 SYSTEM DETAILS

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Page 16
1.0 DESIGN
Frost protection
If it is necessary to protect parts of the heating system or the boiler which are installed in
unheated spaces (e.g. garage, outhouse and ventilated roof space), a frost thermostat(s)
must be fitted. The AccoladeA-CLASS appliance should not be installed in a location where
the contents could freeze.
User controls
Any type of 2 channel programmer or programmable room thermostat is suitable for
use with the AccoladeA-CLASS. Suitable controls can be supplied as optional extras by
Gledhill if required.
System bypass
An automatic bypass valve is built into the appliance to allow thermostatic radiator
valves (TRV’s) to be fitted. To meet the requirements of Building Regulations for a boiler
interlock it is recommended that the radiator in the area where the room thermostat
is installed should be fitted with lock shield valves on both connections.
The bypass valve is set at the factory to 2m head but this should be adjusted on site by
the installer to ensure that there is an adequate (the minimum flow rate recommended
by the boiler manufacturer) flow rate through the boiler when TRVs are closed.
1.3 SYSTEM DETAILS
Pump head
The net pump head available when hot water
only or space heating only are on is shown in
figures 1.4 and 1.5 respectively. The net pump
head available for sizing the boiler radiator
circuit should be calculated using these
figures.
Sealed central heating system
Sealed system kit
An optional sealed system kit as follows can be
supplied with the AccoladeA-CLASS
• Expansion relief valve set at 3.0 bar
• Pressure gauge (0 – 4 bar)
• Primary expansion vessel charged to 1.0 bar,
(Size depends upon the model, see table
2.1)
• WRAS approved primary system filling
loop












Figure 2.3 Schematic diagram of a sealed heating system

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Page 17
ACCOLADE A-CLASS
Pressure gauge and filling loop
Primary
The pressure gauge and the approved filling
loop should be fitted at the system filling point
which it is recommended should be adjacent
to the boiler.
There shall be no permanent connection to
the mains water supply for filling the system,
even through a non-return valve without the
approval of the Local Water Authority. The
approved filling loop should be disconnected
after commissioning the system.
Pressure relief valve
Primary
The pressure relief valve must be fitted in the
boiler flow pipe adjacent to the boiler. There
must no isolating valves or any such devices
between the boiler and the pressure relief
valve. The pressure relief valve should be fitted
in a position where it is accessible for testing/
inspection.
The method of fitting should ensure that
discharge of water or steam cannot create a
hazard to persons in or about the premises or
damage to electrical components or wiring and
the point of discharge shall be clearly visible.
The expansion vessel must accommodate the
change in volume of system water when heated
from 10oC to 110oC (see BS 5449:1990 clause
16.2). When calculating the system water
content, the water content of the primary heat
exchanger (see table 2.1) must be included.
The expansion vessel requirements are shown
in table 3.1. When ordering the optional sealed
system kit it is the installers responsibility to
check that the expansion vessel size is adequate
for the primary/heating system.
Note 1
After first filling the system to a pressure of 1.0
bar at mains supply temperature (typically 15oC
in summer), the total system (space heating and
hot water) should be heated to its maximum
temperature. If the primary pressure gauge
indicates 2.6 bar or higher, then an additional
expansion vessel may be required.
Note 2
If the system pressure required is more than 1.0
bar, then the expansion vessel charge pressure
should be adjusted to match the primary
system pressure and the expansion vessel size
recalculated accordingly.
stnemeriuqerlessevnoisnapxeyramirP1.3elbaT
)rab(gnittesevlavytefaS 0.3
)rab(erusserpegrahclessevlaitinI 0.1 5.1
)rab(erusserpmetsyslaitinI 0.1 5.1 5.1 0.2
)1(metsysfotnetnocretawlatoT )sertil(emulovlessevnoisnapxE
02 2.2 8.3 1.3 6.6
04 4.4 6.7 2.6 2.31
06 5.6 4.11 4.9 9.91
08 7.8 2.51 5.21 5.62
001 9.01 0.91 6.51 1.33
021 1.31 8.22 7.81 7.93
051 4.61 5.82 4.32 7.94
081 6.91 2.43 1.82 6.95
metsysehtylpitlumsemulovrehtoroF
rotcafybtnetnoc 901.0 091.0 651.0 133.0
1.0 DESIGN
1.3 SYSTEM DETAILS

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Page 18
1.0 DESIGN
Open vented heating system
Open vented system kit
An optional open vented kit as follows can be supplied with the AccoladeA-CLASS
• Feed and expansion cistern with lid
• Ball valve & float
• 22mm Overflow pipe connector
• 15mm Cold feed tank connector
F & E cistern
The feed and expansion cistern, can be fitted on top of or up to 10m above the base
of the appliance i.e. the maximum static pressure in the appliance must not exceed
1.0 bar (figure 2.4). The water level in the F & E cistern should be at least 250mm above
the highest point of the system including the radiators.
Overflow pipe
The overflow/warning pipe should be installed using 20mm internal diameter pipe
of a suitable material to comply with BS 5449 (such as copper). It should have a
continuous fall and be discharged in a conspicuous external position. It should not
have any other pipework directly branched into it.
Cold feed/expansion and safety/open vent
The safety/open vent should be connected into the boiler flow pipe ensuring that
there is a continuous rise from the boiler to the point of discharge over the F & E cistern
as shown schematically in figure 2.4. The open vent and cold feed should be run in
a minimum of 22mm and 15mm copper (respectively) or equivalent to the feed and
expansion cistern. There must no isolating valves or any such devices between the
boiler and the safety/open vent termination point.
1.3 SYSTEM DETAILS





 










Figure 2.4 Schematic diagram of open vented heating system
Discharge Arrangements
The P & T valve and Expansion Relief Valve (ERV)
are both provided with tundishes. It is normal
for these to be connected into a single 22mm
discharge pipe but they can be run separately
if required. The first 300mm of pipework below
the tundish should be vertical and not contain
any elbows/bends.
It is the requirement of Building Regulation
Approved Document G3 that the discharge
from an unvented hot water storage system is
conveyed to where it is visible but will not cause
danger to persons in or about the building. The
discharge pipe from the appliance tundish
should be fitted in accordance with these
requirements.
The discharge pipe MUST terminate in a SAFE
and VISIBLE position. For a 22mm discharge it
must have an equivalent length of no more than
9 metres and it must have a continuous fall (1:
200 minimum) throughout its length.

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Page 19
ACCOLADE A-CLASS
In apartment/flat situations the discharge pipes
can be connected into a single pipe which is
discharged at low level. In this case the number
should be limited to 6 to allow the fault to be
easily traced. The single pipe should be at
least one size larger than the largest individual
discharge pipe connected to it.
The discharge can consist of scalding water
and steam therefore the pipework should be
metal.
The following locations for the discharge pipe
are acceptable:
Low Level
• Into a gully below the grating but above the
water level (see diagram 1).
• Onto the ground (drive, parth or garden
area). The pipe should discharge downwards
and be no more than 100mm above ground
level. A wire cage should be provided to
prevent people coming into contact with
scalding water (see diagram 2).
High Level
High level discharge is only acceptable if it is :
• onto a flat or pitched roof capable of
withstanding high temperature water and
at least 3m away from plastic guttering.
or
• into a metal hopper and down pipe which
terminates at low level (as described
above.)
Discharge into a soil or waste pipe
(whether plastic or metal) is not normally
acceptable.
The proposals for the discharge pipe/
termination point should be discussed and
agreed with the Building Control Officer prior
to commencing any work.
Diagram 1
Diagram 2
Discharge into a gully
Discharge onto the ground
Figure 2.5
1.0 DESIGN
1.3 SYSTEM DETAILS

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Page 20
2.0 INSTALLATION
The appliance is designed to be installed in an airing/cylinder cupboard and the
relevant minimum dimensions are provided in section 1.2 Technical Data.
Because of the ease of installation we recommend that the cupboard construction is
completed and painted before installation of the appliance. The cupboard door can
be fitted after installation.
If the unit needs to be stored prior to installation it should be stored upright in a dry
environment and on a level base/floor.
Installation and maintenance access is needed to the front of the appliance and
above the F & E cistern. See section 1.2 Technical Data for further details.
The minimum dimensions contained in section 1.2 Technical Data allow for the
passage/connection of pipes to the appliance from any direction as long as the
appliance is installed on the installation base provided. If the installation base is not
used extra space may be needed to allow connection to the pipework and the whole
of the base area should be continuously supported on a material which will not easily
deteriorate if exposed to moisture.
The floor of the cupboard needs to be level and even and capable of supporting
the weight of the appliance when full. Details of the weight when full is provided in
section 1.2 Technical Data.
The appliance is designed to operate as quietly as practicable. However, some noise
(from pumps etc) is inevitable in any heating system. This will be most noticeable
in cupboards formed on bulkheads, or at the mid span of a suspended floor. In these
cases the situation can be improved by placing the appliance on a suitable sound
deadening material (i.e. carpet underlay or similar).
The cylinder is very well insulated and no ventilation is normally required to the
cupboard.
A suitable location will be needed for the separate feed and expansion cistern or
expansion vessel. This will often be on top of the appliance itself or at high level in
the cupboard housing the AccoladeA-CLASS . The dimensions and clearances are shown
in section 1.2 Technical Data. The location will need to provide a suitable route for
the cold feed/expansion pipe and safety/open vent pipe for the appliance with OV
systems or the connecting pipe to the system expansion vessel with sealed primary
systems. A suitable route and discharge position for the warning/overflow pipe and
the ballvalve supply from the mains cold water system will also be required with OV systems.
A suitable route and discharge location will also be required for the discharge pipe
from the P & T valve and ERV for all models.
An electrical supply must be available which is correctly earthed, polarized and in
accordance with the latest edition of the IEE requirements for electrical Installations BS
7671.
The electrical mains supply needs to be 230V/50Hz/1Ph
Connection must be made using a double-pole linked isolator with a contact
separation of 3mm in both poles which is located within 1m of the appliance. The
supply must only serve the appliance.
The supply to all models shall be fused at 30 amp.
2.1 SITE REQUIREMENTS