Introduction - Hamworthy Sherborne Series Installation, Commissioning And Servicing Instructions

1.0 INTRODUCTION

The boiler must be installed by competent people holding 'GAS SAFE' registration or equivalent. All installations MUST
conform to the relevant Gas Safety & Building Regulations. Health & Safety requirements must also be taken into
account when installing any equipment. Failure to comply with the above may lead to prosecution.
Sherbornes are designed to use Group H Natural Gas (2nd Family) & LPG-Propane (3rd Family). Information on
propane firing in in Appendix A. Boilers MUST NOT be used with other gases. The boiler MUST only be used on a
governed supply.
The Sherborne range of boilers consists of two models:
A high efficiency SE64he with outputs of 13.6 - 64kW & a Condensing SE71c with outputs of 13.6 - 71.3kW
The boiler is fitted with a fan assisted pre-mix burner. Operation is initiated by a full sequence ignition control that
incorporates a Hot Surface Ignition system & rectification supervision of the flame across the range of outputs.
The boiler is designed for direct connection to a room sealed or conventional flue system. Data for the various flue
arrangements is given in Appendix C.
Sherborne boilers can be wall or frame mounted & are intended for the heating of Commercial/Industrial premises. They
may also be used to supply hot water for premises via an indirect cylinder. The boilers are not suitable for direct
connection to domestic hot water supplies or gravity systems.
Sherborne boilers have a low water content & water flow rates MUST be maintained at or above the recommended
levels shown in Appendix E.
Sherbornes are suitable for connection to open vented fully pumped systems & un-vented (pressurised) heating
systems. On un-vented systems have extra safety requirements which must be satisfied including interlocks which will
shut the boiler(s) off should a high or low pressure fault occur.
Pressurisation units must also incorporate a low level water switch which protects the water pumps & will cause the
boiler plant to shut down if a low water condition occur. HHL Department can provide assistance if in doubt.
In all heating installations should use some form of water treatment to reduce formation of lime scale & black iron
oxide sludge. If a pressurisation unit is used, it is prudent to include an hours run meter to give an indication of
pump running time & hence raw water make-up. Any leaks should be attended to as soon as possible to avoid
scale build up within the boiler's waterways.
Sherborne boilers can be installed in banks of up-to three units with either reverse return water flow, (optional kits
available) or with single pipe headers, (non HHL supply). See Appendix E for typical schematic layout.
HHL recommend a 'Primary Loop' circuit to prevent changes in system performance affecting flow through the boiler(s).
For installations of more than three units in a single bank, consult HHL Technical Department for help or assistance.
Each Sherborne boiler is supplied with volt free contact outputs for Normal Run, & General Fault, & 0~10v
analogue control input compatibility.
1.1 Options
•
Flue kits - (Appendix C)
•
Mounting frames for single, double & triple bank configuration (Refer to kit instructions for details)
•
Optional reverse return header kits for double & triple bank configuration (Refer to kit instructions for details)
1.2 Controls peripherals
The controls system has the potential to accept the following control options:
•
An external sensor which allows direct weather compensation on an individual boiler (Not for multiple systems)
•
A clip-in module (LPB Bus) which allows communication with multiple boilers when used with a cascade control.
•
The cascade control which allows management of up to 12 boilers, & interface with a BMS system.
HAMWORTHY HEATING LTD
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SHERBORNE 500001167/E