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Megalife Product Guide
4: Installation - Solar Primary
4.1 Connection To Solar Primary Circuit
The lower (solar) coil of the Megalife solar must be connected to a fully pumped solar primary circuit. The connections
are suitable for 22mm copper pipe direct to the compression fittings provided. The connections are also threaded
3/4” BSP male parallel should BSP connections be required.
The solar primary circuit must have its own dedicated circulating pump, thermal and safety controls which must be
installed as per the manufacturers instructions.
4.2 Control Of Solar Primary Circuit
Temperature control of the Megalife solar must be carried out using a suitable proprietary solar differential
temperature controller. The cylinder temperature sensing probe (supplied with the solar controller) should be fully
inserted with the thermal cut-out probe into the pocket provided on the Solar cylinder.The cable must be secured
using the cable clamps on the controls housing..
The solar differential temperature controller will control the operation of the solar pumped primary circuit to transfer
heat from the solar collector panels to the cylinder via the lower solar primary coil heat exchanger; refer to the
maunfacturer’s installation instructions supplied with the controls selected for details of how to install the ancillary
solar primary circuit equipment. The solar controller and solar primary circulation pump must be wired via the over-
temperature cut-out mounted in the solar controls housing (see Fig 04, below). There must also be suitable check
(non-return) valves installed in the solar primary flow and return to prevent the possibility of any thermo-syphoning
if the solar circulation is stopped.
Connection to the solar differential temperature controller should be in accordance with the manufacturer’s
instructions. The controller should be set to give a recommended cylinder temperature of approx. 60
o
C. The maximum
setting should not exceed 70
o
C otherwise nuisance operation of the thermal cut-outs may occur.
THERMAL CUT-OUT
PROBE
CONTROL ASSEMBLY
POWER SUPPLY TO
SOLAR CONTROLLER
L
N
E
SOLAR CONTROLLER
Fig. 04: Electrical connection - Solar
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