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4
Installation - Solar Primary
4.1 CONNECTION TO SOLAR PRIMARY CIRCUIT
The lower (solar) coil of the Megaflo 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 manufacturer's instructions.
4.2 CONTROL OF SOLAR PRIMARY CIRCUIT
Temperature control of the Megaflo Solar must be carried out using a suitable proprietary solar
differential temperature controller. The cylinder temperature sensing probe (usually supplied
with the solar differential temperature controller) should be inserted into the pocket provided on
the Megaflo Solar (see diagram 9) and its cable secured using the cable clamp supplied.
The solar controller and solar primary circulation pump must be wired via the over-temperature
cut-out mounted in the lower solar controls housing (see diagram 9). This will ensure that the
heat input to the solar coil is interrupted in the event of the cylinder over-heating. 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 tem-
perature of approx. 60
operation of the thermal cut-outs may occur.
C. The maximum setting should not exceed 70
o
Diagram 9 - Solar Coil Control Connections
Solar Cylinder
Controls Housing
Over Temperature
cut out
Note: wires removed from diagram for clarity
C otherwise nuisance
o
Cylinder Temperature
Control Probe Pocket
Cable Clamp
15
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