Hamworthy DORCHESTER DR-SG 20-210 User guide

IMPORTANT NOTE
THESE INSTRUCTIONS MUST BE READ
AND UNDERSTOOD BEFORE INSTALLING,
COMMISSIONING, OPERATING OR
SERVICING EQUIPMENT
INSTALLATION, COMMISSIONING AND
SERVICING INSTRUCTIONS
Gas-red condensing water heater
DORCHESTER DR-SG
Models
20-210, 25-210, 30-210,
35-356, 50-356, 60-356,
70-538, 80-538, 100-538, 120-538

Page 2 / 104 00U07337760-A
DORCHESTER DR-SG - Installation, Operation and Maintenance
Technical Enquiries
To supplement the detailed technical brochures, technical advice on the application and use in the Hamworthy Heating range is
available from our technical team in Poole and our accredited agents.
Site Assembly
󰀨󰀨
󰀨
Commissioning

󰀩
Service Contracts

󰀩󰀩
Breakdown service, repair, replacement
            󰀩    
agents throughout the UK.
Spare Parts
󰀨
options are available to suit you. Please refer to our website hamworthy-heating.com for more details.
IMPORTANT: NOTE TO THE INSTALLER: LEAVE THESE INSTRUCTIONS ADJACENT TO THE GAS METER.
Telephone: [phone] E-mail: [email protected] Fax: [phone]


CONTENTS
............................................................................................................................ 4
1. WARNINGS AND RECOMMENDATIONS...........................................................................5
1.1. Transport and storage ................................................................................................................................... 5
 .............................................. 5
1.3. Handling ........................................................................................................................................................ 6
......................................................................................................................................... 7
1.5. Water composition......................................................................................................................................... 8
2. APPROVALS .........................................................................................................................8
 .......................................................................................................... 8
2.2. Gas category............................................................................................................................................... 11
2.3. Gas supply pressures ................................................................................................................................. 11
3. TECHNICAL SPECIFICATIONS ........................................................................................12
 ................................................................................................................................................. 12
3.2. Boiler components ...................................................................................................................................... 14
3.3. Combustion at 15°C and 1013 mbar........................................................................................................... 16
3.4. Operating conditions ................................................................................................................................... 22
3.5. Electrical connection ................................................................................................................................... 22
4. INSTALLATION ...................................................................................................................23
4.1. Ventilation.................................................................................................................................................... 23
4.2. Unvented installation................................................................................................................................... 23
4.3. Vented installation ....................................................................................................................................... 25
4.4. Removing the cover panel .......................................................................................................................... 26
................................................................................................................ 26
4.6. Flue installation connection......................................................................................................................... 27
4.7. Hydraulic connection................................................................................................................................... 31
4.8. Gas change G20-G31 ................................................................................................................................. 32
4.9. Gas connection ........................................................................................................................................... 37
4.10.Electrical connection / Wiring diagram....................................................................................................... 37
5. START-UP ............................................................................................................................42
5.1. Filling the boiler ........................................................................................................................................... 42
................................................................................................................................................... 42
6. CHECKS AFTER COMMISSIONING.................................................................................42
6.1. Condensate removal ................................................................................................................................... 42
6.2. Gas supply .................................................................................................................................................. 42
7. MAINTENANCE OPERATIONS.........................................................................................43
 ................................................................................................ 44
7.2. Checking the ignition and ionisation electrodes .......................................................................................... 44
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DORCHESTER DR-SG - Installation, Operation and Maintenance

7.3. Cleaning the condensate evacuation pipe .................................................................................................. 45
7.4. Checking the combustion circuit seal.......................................................................................................... 46
 ................................................................................................................ 46
7.6. Checking the gas valve setting ................................................................................................................... 47
7.7. Cleaning the burner and the evacuation in the by-pass and changing the seals........................................ 48
8. END OF PRODUCT LIFE ...................................................................................................50
9. HYDRAULIC DIAGRAMS AND CONFIGURATIONS ......................................................51
10. ELECTRICAL VALIDATION...............................................................................................80
11. OPTIMIZATION....................................................................................................................80
12. SPARE PARTS LIST ...........................................................................................................83
13. CUSTOMER REGULATION PARAMETERS TABLE.......................................................92
14. APPENDIX A......................................................................................................................102
INFORMATION: This symbol draws attention to comments.
CAUTION: May cause damage to the installation or to

WARNING:      
damage.
DANGER: May cause electrocution.
Symbols used in this document
Page 4 / 104 00U07337760-A
DORCHESTER DR-SG - Installation, Operation and Maintenance

1. WARNINGS AND RECOMMENDATIONS

         
         
water storage heater with the mains power on and the casing control cover
removed, all necessary precautions must be taken. The water heater must
.
1.1. Transport and storage
The water heater :
- must be stored vertically at a temperature of between -20 °C and +60 °C,
with a relative humidity of between 5% and 95%.
- must not be stacked,
- must be protected from humidity.
- must not be exposed to the sun.
- must be transported vertically.
- must not be slung.
- must be removed from its pallet for any tilted or horizontal handling. In this
case, the installer will carefully protect the product to avoid any damage
during this handling.
1.2. -
nance


work to be carried out with the power turned on and the casing open.
Basic operations must be carried out with the casing closed.
          
        



            
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obligations
13.01.2023 Page 5 / 104
DORCHESTER DR-SG - Installation, Operation and Maintenance