andrews 24/39 Manual

2 Issue 2 14/07/16
Andrews Water Heaters
Reproduction of any information in this publication by any
method is not permitted unless prior written approval has been
obtained from Andrews Water Heaters.
Andrews Storage Water Heaters have been designed and
manufactured to comply with current international standards of
safety. In the interests of the health and safety of personnel and
the continued safe, reliable operation of the equipment, safe
working practices must be employed at all times. The attention
of UK users is drawn to their responsibilities under the Health
and Safety Regulations 1993.
All installation and service on Andrews Water Heaters must be
carried out by properly qualified personnel and, therefore, no
liability can be accepted for any damage or malfunction caused
as a result of intervention by unauthorised personnel.
Andrews Water Heaters’ policy is one of continuous product
improvement and, therefore, the information in this manual,
whilst completely up to date at the time of publication, may be
subject to revision without prior notice.
Further information and assistance can be obtained from:
Customer support
Monday - Friday
8am - 5pm
Sales: 0345 070 1055
Technical: 0345 070 1057
Email: [email protected]
Website: www.andrewswaterheaters.co.uk
Twitter: @andrewsWH
Copyright Andrews Water Heaters 2015

Issue 2 14/07/16 3
Contents
Contents
1 General and safety information
1.1 General information
1.2 British standards and codes of practice
1.2.1 Standard range & Hiflo range
1.3 Health and safety regulations 1993
1.4 ffectiveness in combating legionella
2 Technical data
2.1 Standard range (Natural Gas)
2.2 Standard range (LPG)
2.3 Hiflo range (Natural Gas)
2.4 Hiflo range (LPG)
2.5 rP data
3 Installation
3.1 Introduction
3.1.1 The law requires that installation is carried out by a
properly qualified person
3.2 Assembling the draught diverter
3.3 Location
3.4 Gas supply
3.4.1 Installation of the LPG supply
3.5 lectrical supply - auto ignition units
3.5.1 Hiflo models - standard range models
3.6 Flue systems
3.7 Air supply and ventilation
3.8 Water quality and treatment
3.9 Water connections
3.9.1 Hydrojet systems
3.9.2 Vented systems, standard range
3.9.3 Correx powered anodes
3.9.4 To install kit
3.9.5 Test the installation
3.9.6 Unvented systems, standard range
3.9.7 Vented systems, Hiflo range
3.9.8 Unvented systems, Hiflo range
4 Commissioning
4.1 Standard range permanent pilot models
4.1.1 Lighting the burner
4.1.2 Shutting off the burner
4.1.3 Checking main burner pressure
4.2 Hiflo range permanent pilot models
4.2.1 Lighting the burner
4.2.2 Shutting off the burner
4.2.3 Checking main burner pressure
4.2.4 Check correct shape and size of pilot flame
4.2.5 Checking for spillage at the draught diverter
4.3 Standard range auto ignition models
4.3.1 Lighting the burner
4.3.2 Shutting off the burner
4.3.3 Checking mains burner pressure
4.4 Hiflo range auto ignition models
4.4.1 Lighting the burner
4.4.2 Shutting off the burner
4.4.3 Checking mains burner pressure
4.5 Instructing the user
4.5.1 All standard and Hiflo models
4.6 Users safety guide
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4 Issue 2 14/07/16
Contents
5 Operation
5.1 Standard range
5.2 Hiflo range
5.2.1 Permanent pilot models, operating sequence
5.3 HIflo and standard range auto ignition
5.3.1 Auto ignition units, operating sequence. Hiflo and standard range
5.3.2 CO (energy cut - off)
5.3.3 Temperature stratification (stacking)
6 Servicing
6.1 Introduction
6.1.1 Servicing must be carried out by a properly qualified person
6.2 Pre - service options
6.2.1 Servicing, carry out the following operations
6.3 Burner assembly standard range
6.3.1 The burner assembly should be checked and cleaned annually
6.4 Burner assembly Hiflo range
6.4.1 The burner assembly should be checked and cleaned annually
6.5 Gas control valve standard range
6.6 Gas control valve Hiflo range
6.7 Fuel ways standard range
6.8 Fuel ways Hiflo range
6.9 Cleaning the storage vessel all models
6.9.1 Descaling
6.10 Magnesium anode(s) all models
6.11 Safety valve Hiflo models
6.12 Restart all models
7 Replacing components, Hiflo range
7.1 Gas control valve
7.2 User - adjustable control thermostat with limit sensor phial and overheat CO
7.3 Thermopile/ pilot, burner/ pilot restrictor
7.4 Burner
8 Fault finding
8.1 Permanent pilot models standard and Hiflo range
8.2 All models
8.3 Auto ignition units standard range
8.4 Auto ignition units Hiflo models
8.5 Checking “correx” anodes
8.6 LPG permanent pilot models - LPG HIflo ranges
9 Parts list and illustrations
9.1 Standard Range models 24/29, 32/40, 40/61, 63/62 (Natural Gas)
9.2 Standard Range models 84/87 (Natural Gas)
9.3 Standard Range models parts list (Natural Gas)
9.4 Standard Range LPG models L24/31, L32/35, L40/36, L63/71
9.5 Standard Range LPG model L84/74
9.6 Standard Range models parts list (LPG)
9.7 HIflo models 32/143 (Natural Gas)
9.8 HIflo models 65/173 and 81/264 (Natural Gas)
9.9 HIflo models parts list (Natural Gas)
9.10 HIflo models 62/341 and 54/418/440 (Natural Gas)
9.11 HIflo models parts list (Natural Gas)
9.12 HIflo LPG model L32/143
9.13 HIflo LPG models L65/169, L81/251
9.14 HIflo P.P Water Heater parts list (LPG)
9.15 HIflo LPG models L62/309, L54/399
9.16 HIflo P.P Water Heater parts list (LPG)
9.17 Unvented systems kit - standard range
9.18 Unvented systems kit - Hiflo range
9.19 Unvented systems kit - standard range parts list
9.20 Unvented systems kit - Hiflo range parts list
9.21 24 Volt auto system kit B217
9.22 24 Volt auto system kit B258
9.23 24 Volt auto system kit standard range parts list
9.24 24 Volt auto system kit Hiflo parts list
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Issue 2 14/07/16 5
Contents
10 Appendix
10.1 Hiflo auto ignition “G” series addendum
10.1.1 Features of honeywell integrated control system
10.2 Specifications
10.3 Sequence of operations
10.4 Troubleshooting
10.4.1 Using control display for servicing the water heater
10.4.2 Service mode
10.4.3 To change the maximum setpoint limit (max setpoint) for the
temperature setpoint
10.4.4 Display of water temperature
10.4.5 To display flame sense current of the pilot flame sensor
10.4.6 To display and change temperature setpoint
10.4.7 To display and change temperature format (°F/°C)
10.4.8 rror codes and error history display
10.4.9 rror code history
10.4.10 To view previous error codes
10.4.11 rror code definitions
10.4.12 Resetting lockout conditions
10.4.13 Resetting error codes in hard lockout conditions
10.5 Service procedure D24 - I
10.5.1 Thermostat circuit testing
10.5.2 Sensor resistance testing
10.5.3 Sensor resistance at various temperatures
10.6 Service procedure D24 - II
10.6.1 Pilot operation testing
10.6.2 Pilot inspection
10.6.3 Pilot operation testing
10.7 Service procedure D24 - III
10.7.1 Main burner operation testing
10.7.2 Checking manifold pressure
10.8 Service procedure D24 - IV
10.8.1 Main burner & pilot removal and inspection
10.8.2 Control board replacement
10.9 Service procedure D24 - V
10.9.1 Flue baffle removal and inspection
10.10 Service procedure D24 - VI
10.10.1 Anode removal and inspection
10.11 General assembly
10.12 Burner assembly
10.13 Control box assembly
10.14 General assembly parts list
10.15 Burner assembly parts list
10.16 Control box assembly parts list
10.17 Dismantling, disposal and recycling
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6 Issue 2 14/07/16
1 General and Safety Information
1 General and safety information
1.1 General information
The Andrews Water Heater has been designed for use with
NATURAL GAS only and is manufactured to give an efficient,
reliable and long service life.
To ensure the continued, trouble-free operation of your heater at
maximum efficiency, it is essential that correct installation,
commissioning, operation and service procedures are carried
out strictly in accordance with the instructions given in this
manual. By law, installation and commissioning of the heater
must be carried out by properly qualified personnel.
The heater(s) must be installed in accordance with the following
requirements;
The current GAS SAF TY (INSTALLATION AND US )
R GULATIONS
The current BUILDING R GULATIONS
The Water Supply (WAT R FITTINGS) R GULATIONS 1999
Additionally, installation should be performed in accordance with
all relevant requirements of the Gas Supplier, Local Authority
and recommendations of the British Standards and Codes of
Practice detailed below.
1.2 British standards and codes of practice
1.2.1 Standard Range & Hiflo Range
BS 6700: Specification for design, installation, testing
and maintenance of services supplying water
for domestic use within buildings and their
curtilages. This standard supersedes the
following British Standards and Codes of
Practice: CP99, CP310, CP324, 202, CP342
Part 2, Centralised Hot Water Supply.
BS 5440 Installation of flues and ventilation for gas
appliances of rated output not exceeding
60kW.
Part 1: Specification for installation of flues.
Part 2: Specification for installation of ventilation for
gas appliances.
BS 5546: Installation of gas hot water supplies for
domestic purposes.
BS 6891 Installation of low pressure gas pipework of up
to 28mm in domestic premises.
BS 7206: Specification for unvented hot water storage
units and packages.

Issue 2 14/07/16 7
General and Safety Information 1
BS N 806 (Parts 1 - 5) Specifications for installations
inside buildings conveying water for human
consumption.
BS 6644 Installation of gas fired water boilers of rated
inputs between 70kW and 1.8MW.
BS N 12897 Water supply. Specification for indirectly heated
unvented (closed) storage water heaters.
IG /UP/1A,1B Strength/tightness testing and direct purging.
IG /UP/2 Installation pipework.
IG /UP/10 - 1 ( dition 4): Installation of gas appliances in
industrial and commercial premises.
IG /UP/10 Pt.1
dition 2 Installation of Gas Appliances in Industrial and
Commercial Premises.

8 Issue 2 14/07/16
1 General and Safety Information
1.3 Health and safety regulations 1993
It is the duty of manufacturers and suppliers of products for use
at work to ensure, so far as is practicable, that such products
are safe and without risk to health when properly used and to
make available to users, adequate information about their safe
and proper operation.
Andrews Water Heaters should only be used in the manner and
purpose for which they were intended and in accordance with
the instructions in this manual. Although the heaters have been
manufactured with paramount consideration to safety, certain
basic precautions specified in this manual must be taken by the
user.
It is imperative that all users of the heater must be provided with
all the information and instruction necessary to ensure correct
and safe operation.
1.4 Effectiveness in combating legionella
Water systems in buildings have been associated with outbreaks
of Legionnaires' Disease, particularly in health care facilities
where occupants are significantly more susceptible to infection.
In recognition of the risks in hospitals, a Code of Practice for the
Control of Legionella in Health Care premises has been issued
by the Department of Health (1991). Codes of Practice
applicable to other premises have been published by other
organisations, principally the Health and Safety xecutive
(HS)(G70) and the Chartered Institute of Building Services
ngineers (CIBS , TM13).
All Codes of Practice draw attention to the design and operation
of water systems with reference to avoidance of factors that
favour colonisation by Legionella bacteria. These factors include
stagnation, lukewarm conditions (20°C to 45°C) and the
accumulation of debris, scale and corrosion in the base of tanks
and calorifiers.
Andrews Water Heaters has commissioned an independent
evaluation of their products to investigate their resistance to
build-up of legionella bacteria.
xperiments were conducted to determine whether, following a
substantial challenge by legionella pneumophila, after overnight
and stagnation conditions, the system was rendered free from
viable recoverable legionella. It was found that at 61°C, following
a challenge of approximately 107 organisms per litre, within one
hour, more than 99.999% of organisms had been killed. After a
subsequent stagnation period, sampling did not reveal any
residual contamination. The design of the base of the water
heater precludes legionella colonisation, even after build-up of
debris. The burner positioning ensures that the water at the
bottom of the heater reaches the same, or higher temperature
as in the rest of the heater.
Based on data obtained through experiment, the Andrews Water
Heater can be described as legionella resistant as it is
considered unlikely that, at the temperature tested, the organism
would colonise the water heater and present a possible health
risk.

Issue 2 14/07/16 9
Technical Data 2
2 Technical data
2.1 Standard Range (Natural Gas)
Andrews Model No. 24/39 32/40 40/61 63/62 84/87
Storage Capacity I 109 145 182 286 382
Recovery thro’ 50°C I/h 156 159 243 247 348
Recovery thro’ 56°C I/h 139 142 217 220 311
Heat Input Gross kW 12 12.5 19 19 26
Heat Input Net kW 11 11.4 17 17 24
Gas NATURAL CAT I2H
Burner Gas Pressure mbar 10 10 10 10 10
Max. Gas Input Pressure mbar 35 35 35 35 35
Gas Flow Rate m3/h 1.12 1.16 1.78 1.78 2.43
Gas Connection Rc (in BSP Int) 1/2 1/2 1/2 1/2 1/2
Flue Gas Temp. °C 200 205 195 160 125
Flue Gas Volume m3/h 17 18 26 31 37
Gas Injector Orifice Diameter mm 2.95 3.05 3.86 3.86 4.22
Flue Size (Secondary) mm 100 100 100 125 125
Cold Water Feed Connection R (in BSP/ xl) 1111 1 1/4
Hot Water Flow Connection R (in BSP/ xl) 1111 1 1/4
*Return Connection Rp (in BSP/ xl) 3/4 3/4 3/4 3/4 3/4
Drain Port Size R (in BSP/ xl) 3/4 3/4 3/4 3/4 3/4
Max. Working Water Pressure (vented) bar 10.3 10.3 10.3 10.3 10.3
Max. Working Water Pressure (unvented) bar 5.5 5.5 5.5 5.5 5.5
Water Test Pressure bar 20.7 20.7 20.7 20.7 20.7
Weight mpty kg 43 57 65 110 181
Weight Full kg 151 202 247 396 562
Shipping Weight kg 44 59 68 120 194
Shipping Dimensions Depth mm 546 587 587 692 914
Shipping Dimensions Width mm 486 537 537 651 762
Shipping Dimensions Height mm 1194 1245 1499 1575 1829

10 Issue 2 14/07/16
2 Technical Data
2.2 Standard Range (LPG)
Andrews Model No. L24/31 L32/35 L40/36 L63/71 L84/74
Storage Capacity I 109 145 182 286 382
Recovery thro’ 50°C I/h 141 163 163 322 336
Recovery thro’ 56°C I/h 113 127 131 258 269
Heat Input Gross kW 9.5 11.0 11.0 22.0 22.0
Heat Input Net kW 8.6 10 10 20 20
Gas LPG CAT I3
Inlet Gas Pressure Propane mbar 37 37 37 37 37
Inlet Gas Pressure Butane mbar 28 28 28 28 28
Gas Flow Rate m3/h 0.36 0.41 0.41 0.83 0.83
Gas Connection Rc (in BSP Int) 1/2 1/2 1/2 1/2 1/2
Flue Gas Temp. °C 180 180 185 125 130
Flue Gas Volume m3/h 16 16 23 28 34
Gas Injector Orifice Diameter mm 1.5 1.6 1.6 2.25 2.25
Flue Size (Secondary) mm 100 100 100 125 125
Cold Water Feed Connection R (in BSP/ xl) 1111 1 1/4
Hot Water Flow Connection R (in BSP/ xl) 1111 1 1/4
*Return Connection Rp (in BSP/ xl) 3/4 3/4 3/4 3/4 3/4
Drain Port Size R (in BSP/ xl) 3/4 3/4 3/4 3/4 3/4
Max. Working Water Pressure (vented) bar 10.3 10.3 10.3 10.3 10.3
Max. Working Water Pressure (unvented) bar 5.5 5.5 5.5 5.5 5.5
Water Test Pressure bar 20.7 20.7 20.7 20.7 20.7
Weight mpty kg 43 57 65 110 181
Weight Full kg 151 202 247 396 562
Shipping Weight kg 44 59 68 120 194
Shipping Dimensions Depth mm 546 587 587 692 914
Shipping Dimensions Width mm 486 537 537 651 762
Shipping Dimensions Height mm 1194 1245 1499 1575 1829

Issue 2 14/07/16 11
Technical Data 2
2.3 HIflo Range (Natural Gas)
Andrews Model No. 32/143 65/173 81/264 62/341 54/418 54/440
Storage Capacity I 145 295* 368* 282* 245* 245
Recovery thro’ 50°C I/h 539 691 1053 1359 1668 1745
Recovery thro’ 56°C I/h 508 617 940 1214 1489 1558
Recovery thro’ 72°C I/h 395 480 731 944 1188 1212
Heat Input Gross kW 42.8 50 80 102 128 139
Heat Input Net kW 39 45 73 93 116 126
Gas NATURAL CAT I2H
Burner Gas Pressure mbar 6.8 6.8 6.8 6.8 6.8 N/A
Permanent Pilot
Burner Gas Pressure mbar 10 10 10 10 11.25
Auto Ignition
Max. Gas Input Pressure mbar 35 35 35 35 35
Gas Flow Rate m3/h 4.0 4.68 7.44 9.48 11.94 13.14
Gas Connection Rc (in BSP Int) 3/4 3/4 3/4 3/4 3/4 3/4
Flue Gas Temp. °C 117 140 150 195 185 215
Flue Gas Volume m3/h 62 73 116 149 186 202
Gas Injector Orifice Diameter mm 2.69 2.87 3.66 3.45 3.50 N/A
Permanent Pilot
Gas Injector Orifice Diameter mm 2.40 2.58 3.25 3.18 N/A 3.26
Permanent Pilot
Flue Size (Secondary) mm 150 150 200 200 250 250
Cold Water Feed Connection R (in BSP/ xl) 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
Hot Water Flow Connection R (in BSP/ xl) 1 1/2 1 1/2 1 1/2 11/2 1 1/2 1 1/2
*Return Connection Rp (in BSP/ xl) 3/4 3/4 3/4 3/4 3/4 3/4
Drain Port Size R (in BSP/ xl) 3/4 3/4 3/4 3/4 3/4 3/4
Max. Working Water Pressure (vented) bar 10.3 10.3 10.3 10.3 10.3 10.3
Max. Working Water Pressure (unvented) bar 5.5 5.5 5.5 5.5 5.5 5.5
Water Test Pressure bar 20.7 20.7 20.7 20.7 20.7 20.7
Weight mpty kg 190 200 289 257 269 269
Weight Full kg 335 495 656 538 514 514
Shipping Weight kg 199 223 316 282 293 293
Shipping Dimensions Depth mm 902 914 914 914 914 914
Shipping Dimensions Width mm 768 762 762 762 762 762
Shipping Dimensions Height mm 1270 1960 2083 1960 1960 1960
* If the water heater is to be used on an unvented system, the combined temperature/ pressure relief valve
must be fitted directly into the tank. The secondary return is then connected to the drain port via a suitable
tee.

12 Issue 2 14/07/16
2 Technical Data
2.4 HIflo Range (LPG)
Andrews Model No. L32/143 L65/169 L81/251 L62/309 L54/399
Storage Capacity I 145 295 386 282 245
Recovery thro’ 44°C I/h 649 788 1140 1403 1812
Recovery thro’ 56°C I/h 517 613 913 1122 1449
Recovery thro’ 72°C I/h 399 472 699 862 1117
Heat Input Gross kW 41.8 49 76 92.5 122
Heat Input Net kW 38 44 69 84 111
Gas LPG CAT I3
Gas Inlet Pressure Propane mbar 37 37 37 37 37
Gas Inlet Pressure Butane mbar 28 28 28 28 28
Gas Flow Rate Propane m3/h 1.61 1.89 2.93 3.58 4.71
Gas Flow Rate Butane m3/h 1.26 1.48 2.29 2.79 3.68
Gas Connection Rc (in BSP Int) 3/4 3/4 3/4 3/4 3/4
Flue Gas Temp. °C 125 125 170 190 170
Flue Gas Volume m3/h 57 67 104 126 167
Gas Injector Orifice Diameter mm 1.60 1.70 1.85 1.78 1.78
Flue Size (Secondary) mm 150 150 200 200 250
Cold Water Feed Connection R (in BSP/ xl) 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2
Hot Water Flow Connection R (in BSP/ xl) 1 1/2 1 1/2 1 1/2 11/2 1 1/2
*Return Connection Rp (in BSP/ xl) 3/4 3/4 3/4 3/4 3/4
Drain Port Size R (in BSP/ xl) 3/4 3/4 3/4 3/4 3/4
Max. Working Water Pressure (vented) bar 10.3 10.3 10.3 10.3 10.3
Max. Working Water Pressure (unvented) bar 5.5 5.5 5.5 5.5 5.5
Max. Test Pressure bar 20.7 20.7 20.7 20.7 20.7
Weight mpty kg 190 200 289 257 269
Weight Full kg 335 488 656 618 514
Shipping Weight kg 199 230 316 287 293
Shipping Dimensions Depth mm 902 914 914 914 914
Shipping Dimensions Width mm 768 762 762 762 762
Shipping Dimensions Height mm 1270 1960 2210 1960 1960
* If the water heater is to be used on an unvented system, the combined temperature/ pressure
relief valve must be fitted directly into the tank. The secondary return is then connected to the
drain port via a suitable tee.

Issue 2 14/07/16 13
Technical Data 2
2.5 ErP data
Standard Range Permanent Pilot 24/39 32/40 40/61 63/62 84/87
Declared load profile L XL XL XXL XXL
Water heating energy efficiency class
Water heating energy efficiency % 56 63 60 56 59
Annual energy consumption kwh(1) 00000
Annual energy consumption Gj(2) 16 24 25 35 32
Other load profiles for which the water heater is suitable to use and the corresponding -----
water heating energy efficiency and annual electricity consumption(3)
Thermostat temperature setting °C 60 60 60 60 60
Sound power level LWA indoors dB 53 47 47 42 43
Ability to off-peak hours functioning(3) -----
nables smart control settings(4) -----
(1) lectricity
(2) Fuel
(3) If applicable.
(4) If smart control settings value is "1", the water heating energy efficiency and annual electricity and fuel consumption only relate to enabled smart control settings.
B
B
B
C
C
Hiflo 32/143 65/173 32/143 65/169
Declared load profile XL XXL XL XXL
Water heating energy efficiency class
Water heating energy efficiency % 63 66 63 66
Annual energy consumption kwh(1) 0000
Annual energy consumption Gj(2) 24 29 24 29
Other load profiles for which the water heater is suitable to use and the corresponding ----
water heating energy efficiency and annual electricity consumption(3)
Thermostat temperature setting °C 65 60 65 60
Sound power level LWA indoors dB 47 49 47 49
Ability to off-peak hours functioning(3) ----
nables smart control settings(4) ----
(1) lectricity
(2) Fuel
(3) If applicable.
(4) If smart control settings value is "1", the water heating energy efficiency and annual electricity and fuel consumption only relate to enabled smart control settings.
B
B
B
B
Standard Range Auto 24/39 32/40 40/61 63/62 84/87
Declared load profile L XL XL XXL XXL
Water heating energy efficiency class
Water heating energy efficiency % 54 57 56 56 55
Annual energy consumption kwh(1) 9 11 598
Annual energy consumption Gj(2) 17 27 27 35 35
Other load profiles for which the water heater is suitable to use and the corresponding -----
water heating energy efficiency and annual electricity consumption(3)
Thermostat temperature setting °C 60 60 60 60 60
Sound power level LWA indoors dB 53 47 47 42 43
Ability to off-peak hours functioning(3) -----
nables smart control settings(4) -----
(1) lectricity
(2) Fuel
(3) If applicable.
(4) If smart control settings value is "1", the water heating energy efficiency and annual electricity and fuel consumption only relate to enabled smart control settings.
B
B
B
C
C

14 Issue 2 14/07/16
2 Technical Data
Standard Range Natural Gas Permanent Pilot 24/39 32/40 40/61 63/62 84/87
Daily electricity consumption Qelec kWh 0.001 0.001 0.001 0.001 0.001
Declared load profile L XL XL XXL XXL
Sound power level, indoors LWA dB 53 47 47 42 43
Daily fuel consumption Qfuel kWh 12.460 18.271 19.183 26.628 24.092
missions of nitrogen oxides NOxmg/kWh 92 95 102 102 102
Weekly fuel consumption with smart controls Qfuel, week, smart kWh -----
Weekly electricity consumption with smart controls Qelec, week, smart kWh -----
Weekly fuel consumption without smart controls Qfuel, week kWh -----
Weekly electricity consumption without smart controls Qelec, week kWh -----
Storage volume VI114 151 189 284 379
Mixed water at 40 °C V40 I 170 229 333 467 505
Harmonised standards applied N: 13203-2
Specific precautions that shall be taken when the water Before any assembly, installation or maintenance the installation and
heater is assembled, installed or maintained: operation manual has to be read attentively and to be followed
Standard Range Natural Gas Auto 24/39 32/40 40/61 63/62 84/87
Daily electricity consumption Qelec kWh 0.053 0.06 0.036 0.039 0.038
Declared load profile L XL XL XXL XXL
Sound power level, indoors LWA dB 53 47 47 42 43
Daily fuel consumption Qfuel kWh 12.460 18.271 19.183 26.628 24.092
missions of nitrogen oxides NOxmg/kWh 92 95 102 102 102
Weekly fuel consumption with smart controls Qfuel, week, smart kWh -----
Weekly electricity consumption with smart controls Qelec, week, smart kWh -----
Weekly fuel consumption without smart controls Qfuel, week kWh -----
Weekly electricity consumption without smart controls Qelec, week kWh -----
Storage volume VI114 151 189 284 379
Mixed water at 40 °C V40 I 155 271 333 420 916
Harmonised standards applied N: 13203-2
Specific precautions that shall be taken when the water Before any assembly, installation or maintenance the installation and
heater is assembled, installed or maintained: operation manual has to be read attentively and to be followed
Hiflo Natural Gas 32/143 65/173 81/264 62/341 54/418 54/440
Daily electricity consumption Qelec kWh 0.053 0.06 0.036 0.039 0.038 0.001
Declared load profile XL XXL XXL XXL XXL XXL
Sound power level, indoors LWA dB 47 49 62 59 61 60
Daily fuel consumption Qfuel kWh 18.164 22.191 23.469 22.365 21.440 22.162
missions of nitrogen oxides NOxmg/kWh 160 185 181 185 185 185
Weekly fuel consumption with smart controls Qfuel, week, smart kWh --- - - -
Weekly electricity consumption with smart controls Qelec, week, smart kWh --- - - -
Weekly fuel consumption without smart controls Qfuel, week kWh --- - - -
Weekly electricity consumption without smart controls Qelec, week kWh --- - - -
Storage volume VI144 303 379 284 246 246
Mixed water at 40 °C V40 I∞∞366 ∞∞∞
Harmonised standards applied N: 13203-2
Specific precautions that shall be taken when the Before any assembly, installation or maintenance the installation and
water heater is assembled, installed or maintained: operation manual has to be read attentively and to be followed

Issue 2 14/07/16 15
Installation 3
3 Installation
3.1 Introduction
3.1.1 The law requires that installation is carried
out by a properly qualified person
Installations must be carried out in accordance with Gas safety
(Installation and Use) Regulations 1998, Building Regulations,
The Water Supply (Water Fittings) Regulations 1999 and any
requirements of the local Gas Authority, Local Authority, Water
and Fire Authorities and the current British Standards and
Codes of Practice.
The fittings pack supplied with the heater contains the
items listed below.
1 - Installation and Service Manual.
1 - Coupler Socket 3⁄4in BSP.
1 - Gas Cock.
1 - Drain Cock.
1 - Flue Adaptor Socket (Where required).
2 - Cap nd 11⁄2in BSP (Hiflo only).
2 - 11⁄2in x 3in Nipples (32/143 Model only).
3.2 Assembling the draught diverter
The draught diverter must be assembled with the legs provided.
Attach the legs to the draught diverter with the nuts and bolts
provided.
Fit the draught diverter (1) as shown in Fig.1 to the water heater
using the screws provided. For Standard Range fit the draught
diverter to the top of the water heater using the location holes.
In some cases, it may be necessary to drill the fixing holes in the
top cover to fit the draught diverter to the water heater. By using
the draught diverter as a template, position carefully over the
flueway and mark the hole positions to be drilled 4mm.
Fit the adaptor socket (2) and seal into the draught diverter as
shown in Fig. 1.
Fig. 1
Top connections
65/173
NB. lbows not provided
1
2
Top connections
81/264 only
elbows must
be used
See
Listed in Section 1, General and Safety Information

16 Issue 2 14/07/16
3 Installation
3.3 Location
The location selected for installation of the heater must allow the
provision of a satisfactory flue, adequate air supply, drain
facilities and must be well illuminated.
A purpose built boiler room or compartment is strongly
recommended.
A manual valve for isolation of the boiler room should be
installed in the gas supply; it should be clearly identified and
readily accessible for use at all times.
If a purpose built boiler room is not available, measures should
be taken to protect the heater from damage and prevent any
extraneous matter from being stored on or around the heater.
The heater must not be installed in any location which contains
a bed, bath or shower.
There must be easy access to the boiler room and heater at all
times.
A clearance of 800mm for Hiflo and 300mm for Standard Range
should be left at the front of the heater for removal of the burner.
Clearances at the sides and rear of the heater should be at least
305mm.
Above service clearances for removal of the anodes and flue
baffles should be provided as detailed below.
Standard Range
Models 24/39, 32/40, 40/61 762mm
Model 63/62 1143mm
Model 84/87 1270mm
Hiflo Range
Model 32/143 597mm
Model 81/264 1300mm
Models 65/173, 62/341, 54/418, 54/440 1143mm
The floor on which the heater is installed must be non-
combustible, flat, level and of sufficient strength to withstand the
weight of the heater filled with water and should satisfy the
requirements of the Local Authority and Building Regulations.
See
See BS 6644 Clauses 4, 5 and 6 for details.
Note
If the heater is in an exposed position and out of use
during a period of heavy frost, it is recommended that the
whole system is drained down to prevent damage due to
the formation of ice inside the storage vessel.
See
see Section 2, Technical Data

Issue 2 14/07/16 17
Installation 3
3.4 Gas supply
The installation of the gas supply must conform, depending on
it's size, to the requirements of British Standards and Codes of
Practice.
A gas meter will be connected to the service pipe by British Gas
plc or it's authorised contractor.
The meter and service pipe should be checked by British Gas or
it's authorised contractor to ensure that they are adequate to
deal with the gas supply to the water heater(s) in addition to any
existing or additional requirements.
Gas supply cock, standard models
Fit the gas supply cock immediately upstream of the gas control
thermostat using a suitable jointing compound and connect to
the gas supply. Do not apply heat in close proximity to the gas
thermostat as damage to the control will result. A pressure test
point nipple is fitted to the gas control thermostat at the gas inlet
to test the incoming gas pressure.
Gas supply cock, Hiflo models
Fig. 2. Fit the gas cock immediately upstream of the gas control
valve using a suitable jointing compound and connect to the gas
supply. An inlet nipple complete with pressure test point nipple is
factory fitted to the gas control valve to avoid possible damage.
Where the water heater(s) is(are) installed in a boiler house or
purpose built compartment, a manually operated valve for the
boiler house must be fitted in accordance with the Gas Safety
(Installation and Use) Regulations 1998. The valve must be
easily identified and readily accessible.
After installation, the system should be pressure tested for
soundness and purged in accordance with BS 6891 or IM/2 and
IM/5 as appropriate.
3.4.1 Installation of the LPG supply
Fig. 3. When using propane or butane cylinders connect a
minimum number of cylinders as listed below, together with a
manifold before connecting to the union.
Use a minimum pipe size of 3/4 in bore.
One cylinder All Standard Range models
Two cylinders HIflo models L32/143, L65/169, L81/251
Three cylinders HIflo model L62/309
Four cylinders HIflo model L54/399
WARNING!
Propane and Butane cylinders must be used and stored in
accordance with ‘The highly flammable liquids and liquified
petroleum gases regulations 1972’ and should comply with
LPGA code of practice 7, ‘Storage of full and empty LPG
cylinders and cartidges’.
Fig. 2
Gas Cock
Gas Valve
Nipple
BSP Thread U.P.T. Thread
See
Listed in Section 1, General and Safety Information
Note
The Andrews Water Heaters Covered in this Manual Must
Only be Used with Natural Gas.
Heavy steel sleeved
pipe through wall
Heavy steel sleeved
pipe through wall
Gas emergency control
at entry point to building
Gas emergency control
at entry point to building
Steel liner sealed to
pipe at inside end
Steel liner sealed to
pipe at inside end
To bulk supply
Gas cock
Regulator normally
fitted at tank
Regulator set to give
37 mbar Propane
Regulator set to give
37 mbar Propane
Cylinders
Pigtail
assembly Automatic
change
over device
Nipple
Fig. 3
Bulk storage vessel installation
Cylinder installation

18 Issue 2 14/07/16
3 Installation
3.5 Electrical supply - Auto ignition units
3.5.1 Standard Range models - Hiflo models
xternal wiring to the water heater(s) must be installed in
accordance with current I. . . Regulations for the wiring of
buildings and to any Local Regulations that may apply.
The Auto Ignition Heater is designed to operate from a
220/240V, Single Phase supply. The fuse rating is 5 amps.
The method of connection to the mains electricity supply should
facilitate complete electrical isolation of the appliance, preferably
by use of an unswitched shuttered socket outlet in conjunction
with a fused three pin plug, both complying with the
requirements of BS 1363.
Alternatively, a fused double pole switch or fused spur box
serving only the heater may be used.
The point of connection to the mains electricity supply should be
readily accessible and adjacent to the appliance.
Fig 3a and 3b.
Connect the electrical supply to the main control panel terminal
block via the cable glands in the base of the control panel.
Mains input cable should be 0.75mm2, 3 core, and should be
connected to the mains supply as detailed above.
It is recommended that screen cable is used where the volt-free
contacts are to be connected from an external supply. This will
eliminate the risk of possible interference from nearby high
voltage cables.
Data sheets available for Hiflo and Standard Range, Automatic
Ignition Control System. Contact Andrews Water Heaters.

Issue 2 14/07/16 19
Installation 3
EARTH BINDING POST
Volt Free Output
For Over - Heat
Volt Free Output
For Lock - Out
Interlock Contact 2
(Time-switch)
Interlock Contact 1
(Additional Combustion
Safeguard)
Neutral
Live input
The interlock contact terminals 3&4 -
5&6 must be linked if no device is
fitted.
NOTE:
Fuse 5A
Relay 1
Custom PCB
Red Cable
Yellow Cable
Blue Cable
On/Off Switch
Power “On” Neon
Limit ThermostatControl Thermostat
Lock-Out LED
1
Gas Inlet 1/2”BSP
Pilot Burner Assembly
H.T Lead
Maclaren Gas Block
Gas to Main Burner 1 2”BSP
2
3
4
5
6
7
8
9
10
EP6SX Automatic Gas Burner Control Unit
Brown Cable
Black Cable
Time-switch Motor if fitted
M
Relay 2
1 2 3 4 5 6 7 8 9 10
GREEN
LED
RED
LED
YELLOW
LED
Flame failure Flue Fan
230 Vac @
5Amp Max
Timeswitch
24Vac
Air Switch
24Vac
Always remove links when
fitting an air pressure switch.
M
F2
F1
4AT
400 mAT
20mm Cartridge Fuse
20mm Cartridge Fuse
Main Printed Circuit Board
Timer Link
Flue Damper
Link
OFF
OFF
0
Gv2
Yellow wires
Black
Purple
Orange
Red
Green/Yellow
White
H.T.
Flame
Detect
Earth
Return
Main Earth Stud
PilotAssembly
White
Black
Yellow
Flue Damper
24Vac
ECO
ECO 1
ECO 2
FD 24V
FD 0V
FD 2
FD 1 Stat
Stat
Orange
Yellow
Yellow
1
2
34
Pink
24Vac
24Vac
24 Vac ON/OFF Switch
Gv1
ON
ON
LIVE
FAN L
NEUTRAL
FAN N
MFF2
MFF1
CH2
CH1
Timer 1
Timer 2
N.O.
Air Switch
Terminals
APS
Link
Link
APS
Volt free
contacts
Electrical Mains
Input
COM.
N.C.
OverheatMains On
FITTING OPTIONS
1] TO FIT A TIMESWITCH, move the timer jumper/link to the “On”
Position as shown on the drawing above, then wire as shown.
KEY
GV1/PV = PILOT OR START GAS VALVE
GV2/MV = MAIN GAS VALVE(S)
A.P.S. = AIR PRESSURE SWITCH
E.C.O. = ENERGY CUT OFF
F.D. = FLUE DAMPER
F1&F2 = FUSES
2] TO FIT AN AIR SWITCH, remove the two links from the APS
terminals and connect the pressure switch as shown on the drawing
above.
3] TO FIT A FLUE DAMPER, move the flue damper jumper/link to the
“On” position as shown on the drawing above, then wire as shown.
Fig. 3a
Standard Range
Fig. 3b
HIflo Range (Natural Gas only)

20 Issue 2 14/07/16
3 Installation
3.6 Flue systems
Detailed recommendations for flue installation are given in BS
6644, BS5440 Pt 1 and British Gas publication IM/11 - Flues for
Commercial and Industrial Gas Fired Boilers and Air Heaters.
The flue connection is designed for BS 835 type heavy duty flue,
but light quality flue pipe, mild steel or stainless steel sheet may
be used using the appropriate adapter. Flue pipes etc. shall be
fitted socket-up to keep any condensate within flue and
appliance. Flues up to 200mm diameter should be fitted with a
suitable British Gas Certified terminal.
Fig 4a.
The terminal position is most important and must be at least
1000mm above roof surfaces or at least 600mm above any
parapet and clear of any adjacent obstruction as well as being
clear of any openable windows, ventilators or features which
could allow re-entry of flue products into the building. Pressure
areas should also be avoided to prevent blowdown.
Flue materials, including jointing materials and fittings shall be
asbestos-free, robust, durable, corrosion resistant and non-
combustible and shall comply with BS 5854 and BS 715 or BS
4076 as appropriate, as well as being of a type accepted by the
Local Gas Authority.
When passing up through or adjacent to combustible materials,
measures shall be taken to prevent the temperature of the
combustible material from exceeding 60°C. The flue shall not be
closer than 50mm to any combustible material except when
passing through, when it must be enclosed by a non-
combustible sleeve and separated from the sleeve by not less
than 25mm air space.
Flues shall be of a size not less than specified in Section 2,
Technical Data (i.e. nominal flue size) and fitted so that there is
no risk to persons in the building or from accidental damage.
Fig 4b.
If using an existing brick chimney, it should be swept and lined
and checked for soundness before connecting the flue and
should take the shortest possible route and rise continuously to
the terminal avoiding the use of 90° bends where a change of
direction is required. Horizontal and very shallow runs of flue
should be avoided since they impede the flow of gases and
increase local cooling.
*A minimum of 600mm of vertical flue directly above the draught
diverter should be provided where possible on all natural
draught flue installations. If this dimension cannot be achieved
please contact Andrews Water Heaters.
Fig. 4a
Fig. 4b
Terminal
Roof
600mm*
Split flue clip
1. This flue run
must not be used
2 & 3 are recommended flue runs
123
1000mm
Minimum
See
See recommendations in BS 6644. BS 5440 Part 1 also
provides useful additional advice.
Note
Please note this is not required where a common flue
header is used on multiple installations.