RM Solar Combi Konverter Solar System Installation Manual - page 11
Hydraulic Balancing
As part of the commissioning process the installer should ensure that adequate hot temperature, albeit
at reduced flow rate, is provided from the Combi under conditions when the cylinder is depleted of hot
water. To ensure this, it is essential that the hydraulic resistance through the Combi circuit is such that
at the point where the flows from the cylinder and Combi combine, the Combi flow circuit will have
a sufficient pressure differential to prevent excessive cooling of the combined flow due to cold water
emerging from the cylinder
Handing over the system
Following commissioning it is important that the householder is made aware of the basic operation of the
system including the end user adjustable settings on the solar controller.
It should be explained to the householder that in situations where low levels of solar input coincide with a
high hot water demand such as bath filling, the hot water delivery characteristics will change significantly
once the pre-charge of water from the cylinder is exhausted. Under these circumstances by reducing the
flow at the tap (semi-closing the tap) the water temperature will increase to a usable temperature.
Under these circumstances a continuous flow of hot water can still be maintained albeit at a reduced flow
rate.
Optional Blender
If the Combi is known to be solar compatible then an optional blender (see fig 7) can be used with an
outlet temperature set to the maximum permissible inlet temperature of the Combi. This is connected
using the ‘spare’ 22mm male connection on the cylinder (see Fig 9).
Fig 9 – Optional Blender
The same option can also be used with most other combis provided the blender set outlet temperature
does not exceed 30oC.