10
!
WARNING
All plumbing installations must comply with local standards, regulations
and bylaws. Refer to the latest versions of SANS 1352, SANS 10252, SANS 10254
NOTE:
•
Ring-main systems are less energy efficient due to higher thermal losses in the circulation pipes.
•
To minimise thermal losses it is very important that the circulating piping in the ring-main
system be insulated properly with at least R-1 rated lagging. In the case of a 20mm (3/4
inch) pipe, R-1 rated lagging has a thickness of about 25mm.
5
MICRO CIRCULATION FUNCTION
Your Enerflow heat pump has the functionality of heating a central, ring-main water distribution
pipeline. This function is used to ensure that hot water is supplied throughout the residence as
an instant hot-water-on-tap solution. The installer will ensure that the commissioning valve on
the return line is set to an approximate 10% bypass (i.e. closed 90%). Activate the micro circu-
lation function by changing Parameter 8 to the value of 1 (see section on Heat Pump Operating
Parameters) on the intelligent controller. With this function enabled, the water pump will run for
40 seconds during the period set in Parameter 9 (adjustable between 2 and 60 minutes). Thus, if
Parameter 9 is set to 10, the heat pump will start the water circulation pump every 10 minutes for
the predefined 40 seconds. Depending on the volume of water in the ring-main, the Parameter
9 interval should be adjusted accordingly (more volume = smaller intervals to ensure that the
water is kept at the desired temperature).
Micro Circulation Function
(See Section 3.8)
0 = function off;
1 = function on.
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