Heatrae Sadia Megaflo Eco Solar Series, Product Manual

Page: 24 / 40

24
Unvented Hot Water Cylinder
INST
ALLA
TION AND
COMMISSIONING INSTRUCTIONS (2)
SOLAR PRIMARY
CONNECTION TO THE SOLAR PRIMARY CIRCUIT
The lower (Solar) coil of the MEGAFLO
Eco
Solar must be connected to a fully pumped solar primary circuit. The connections are suitable for a
22mm copper pipe direct to 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 manu-
facturer’s instructions.
CONTROL OF SOLAR PRIMARY CIRCUIT
Temperature control of the MEGAFLO
Eco
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 pro-
vided on the MEGAFLO
Eco
Solar (Figure 17 below ) 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 (Figure 17 below). 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 temperature of approx. 60°C otherwise nuisance operation of the thermal cut-outs may occur.
The MEGAFLO
Eco
Solar cylinders are fitted with two additional sensor pockets for use with solar controllers. A second 10mm pocket is sup-
plied within the bottom Solar Control assembly and a 8mm pocket is supplied near the T&P valve, this pocket can be removed and used as a
secondary circulation connection if needed,
on Indirect models only
THERMAL CUT-OUT
PROBE
CONTROL ASSEMBLY
POWER SUPPLY TO
SOLAR CONTROLLER
L
N
E
SOLAR CONTROLLER
Figure 17 - Solar wiring layout