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pallet using screws. These must be removed before trying to remove the unit from the pallet.
The unit can then be slid off the pallet and located into position. Care should be taken to ensure
that the unit does not tilt more than 45° when being moved around as this can cause internal
damage.
3.4 Heating Circuit Connection
3.4.1 Heating Medium
The heating system should be completely flushed to remove impurities and deposits from sealants
and fluxes. The heating circuit should be flushed, purged and pressure tested according to MCS
guide MIS3005 and to the relevant Building Regulations. An inhibitor should be added to the
water to prevent corrosion, scale and bacteria growth. This should be added according to the
inhibitor manufacturer’s guidelines. Glycol should be added to the system in areas where the
ambient temperature drops below freezing. The amount of Glycol to be added should be
determined according to the manufacturer’s instruction. Warmflow provide a non-toxic glycol
solution complete with corrosion, scale and biological inhibitor.
3.4.2 Heating Connections to the Heat Pump
The unit comes with female union fittings for the heating flow and return connections. Two flexible
hoses with connections to attach to the female unions are included with the unit. These should
be used to reduce any vibration or noise which may be transferred to rigid pipe or the building
structure.
3.4.3 Heating Circuit and Integrated Circulator
A variable speed high efficiency circulator for the heating circuit is provided within the casing of
each unit. The circulators have been sized to accommodate the majority of heating systems
based on the heat output of each unit. However, due to the variation in each system, checking
that the minimum required flow rate is achievable is essential. The table below shows the
minimum and maximum required flow rates for each unit at minimum and maximum heat outputs
respectfully.
Table 6 Heating flow rate requirements
Heat Pump
Heat Output (kW)
Required Flow Rate (l/min)
Min circuit
volume (L)
Minimum
Maximum @ Min. Output
@ Max.
Output
AS01-R32
2
8
10
20
18
AS02-R32
5
12
16
30
30
AS03-R32
7
20
28
60
50
3.4.4 Bypass / Open Zones
It is essential that the heating circuit can always achieve a minimum flow rate of at least 10 litres
per minute even when no zones are calling for heat. This can be achieved by fitting a bypass
between the flow and return or by leaving a number of zones/radiators permanently on. This will
significantly reduce short cycling and nuisance alarms such as low flow rate. It is also essential
to provide freeze protection as detailed in section 3.4.5.
Summary of Contents for A Series
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