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10.0
WATER CONNECTIONS
10.1
WATER HEATERS
10.1.1
GENERAL
Mini Copper-Fin water heaters require a minimum flow rate and should also be supplied with separate storage
vessels. Suitably sized pumps and separate storage vessels are available from Lochinvar Limited as ancillary
options.
Note:
Lochinvar Limited recommends the use of glanded bronze pumps.
Recommended pipework layouts are available for different water heater and storage vessel combinations. Please
contact Lochinvar Limited for details.
recommended that a reverse-return arrangement is used to ensure equal flow through each unit.
The requirements of minimum water flow are given in Table 10.2. Recommendations for the water circulation
system are given in BS6644 and CP 342. The following notes are of particular importance.
1.
When the unit is being utilised as a direct-fired water heater it is designed for use with a direct type
storage vessel. Contact Lochinvar Limited for help in sizing the storage vessel
2.
Circulating pipework not forming part of the useful heating surface should be insulated. Cisterns,
expansion vessels and pipework situated in areas exposed to freezing conditions should also be
insulated.
3.
Drain valves must be located in accessible positions that will permit draining of the entire system
including the unit and the storage vessel.
4.
Tapping sizes for connection to the water system are detailed in Table 3.1.
5.
Ideally, individual valves should be fitted to each unit to enable isolation from the system. The
arrangement must comply with the requirements of BS6644.
6.
Every system should be provided with a water gauge complete with isolating valve so that the pressure
of the system may be displayed for commissioning and maintenance purposes.
10.1.2
OPEN VENTED SYSTEM ARRANGEMENT
The Lochinvar Mini Copper-Fin can be used in an open vented arrangement provided that a vent pipe in
accordance with CP342, BS6644 or BS6700 as appropriate is fitted. The minimum static head requirement for an
open vented system is 0.5 bar.
10.1.3
UNVENTED SYSTEM ARRANGEMENT
NOTE:
IT IS STRONGLY RECOMMENDED THAT UNVENTED HOT WATER SYSTEMS BE
INSTALLED BY AN APPROVED INSTALLER.
If the Lochinvar Mini Copper-Fin is to be used in an unvented arrangement, the system should follow the guidance
given in BS6700 and must comply with The Building Regulations: Part G3. A kit of components that have been
suitably sized for the unvented operation of the appliance is available from Lochinvar Limited. For further
information, contact Lochinvar Limited.
10.1.4
WATER PRESSURE GAUGE
Every system should be provided with a gauge complete with isolating valve so that the pressure of the system
may be displayed for commissioning and maintenance purposes.
10.1.5
DRAIN VALVES
Each unit should be provided with a 15mm drain valve fitted into the return to enable the heat exchanger to be
drained without draining the entire system.
When multiple units are connected using common pipework, it is
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