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A 5m head circulation pump must be installed on the flow pipework and a second 5m head
circulation pump must be installed on the return pipework back to the Air-to-Water Heat Pump
to ensure that minimum flow rates will be achieved (as per installation schematics). Installing
a single circulation pump will not guarantee the correct flow rate. Unless using a Smart plumb
cylinder or Low loss header/Buffer vessel.
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Site visits to solve a flow rate issue due to the installation of a single pump on the pipework are
not covered under EUW and as such will incur a callout charge.
•
Underfloor heating pipe centres to be equal to or less than 150mm.
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Standard radiators to be a minimum twice and up to 4 times the standard radiator size.
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No mixing sets to be used on the underfloor heating manifolds.
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All manifolds must have an individual pump to help circulate and maintain flow rate.
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All radiator zones must have individual pump to help circulate and maintain flow rate.
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All zones to be controlled using 2 port valves (22mm on heating zones and 28mm on hot water zone).
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3 port valves are not to be used.
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Mechanical by-pass valve to be installed after pump on flow but before any zone valves.
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All underfloor heating circuits to be controlled from the run signal from the third party underfloor
wiring centre.
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All radiator zones to be controlled from 3rd party time clock and stat.
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Hot water cylinder is controlled by the Samsung service controller.
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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.
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Underfloor heating circuits are controlled by room stats.
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Use of time clocks to turn off underfloor heating circuits is not recommended.
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Room stats in underfloor heating circuits should not be turned off but set back to a lower tem-
perature using appropriate heating setback control for periods of unoccupied use.
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The flow switch must be installed in horizontal pipework. Allow a minimum of 150mm horizontal
pipework on each side of the flow switch.
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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 callout charge.
Heat Pump Installation Guide
19
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