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14
Victorum EAHP Unit
First Fix Notes
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Underfloor heating pipe centres to be equal to or less than 150mm.
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Radiators are to be sized according to standardized design methods. Eg. SR.50 or MCS.
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An electronic mixing valve is required for underfloor heating. This is to control the flow
temperature entering the floor.
•
All underfloor heating manifolds must have a suitable sized additional circulating pump to
maintain a constant flow rate through the UFH loops.
•
All zones to be controlled using 2 port valves (minimum valve size 22mm).
•
3 port valves MUST not be used.
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Mechanical by-pass valve to be installed after the primary circulating pump on the flow pipe
but before any heating zone valves (Not applicable to pre-plumbed units as the by-pass is
incorporated).
•
All underfloor heating circuits to be controlled via a third party underfloor wiring centre. A volt
free signal is to be used to signal the pre-plumbed unit.
•
The hot water control is managed through the touchscreen controller. Heating is prioritized
over hot water production.
•
For heating via underfloor heating, the End user interacts with 3rd party controls only. It is
the installers responsibility to ensure that attached designs are followed to achieve this or
if a uniquely designed system is being installed the designer must allow for the 3rd party
controls facility.
•
Underfloor heating circuits are controlled by 3rd party room thermostats.
•
Use of time clocks to turn off underfloor heating circuits is not recommended.
•
Room thermostats in underfloor heating circuits should not be turned off but set back to a
lower temperature using appropriate heating setback control for periods of unoccupied use.
•
Air is the most prevalent cause of restricted flow in the system. Make sure that all pipework
can easily be purged of air and that all air is removed from the system prior to starting the unit.
Site visits to solve a flow rate issue due to the presence of air are not covered under EUW and
as such will incur a call-out charge.
•
Air must be purged from the system using a suitable fill & flush pump via the fill & flush
valve. This is the easiest way to purge all air from the system.
•
The Heat Pump duct connections are Ø150mm. Flat Pack, Round or Semi Rigid duct is
acceptable however, the cross sectional area must not be reduced; it must be maintained or
increased to avoid noise in the duct system.
