Installation - Solar Primary; Connection To The Solar Primary Circuit; Control Of Solar Primary Circuit; Solar Thermal Cut-Out Wiring - Ecodan 150 Standard Installation And Servicing Instructions

INSTALLATION - SOLAR PRIMARY

CONNECTION TO THE SOLAR PRIMARY CIRCUIT

The lower coil of the Solar models 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 manufacturer's instructions.

CONTROL OF SOLAR PRIMARY CIRCUIT

Temperature control of the Solar models when heated by a solar thermal system must be carried out using a suitable pro-
prietary 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 cylinder 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 Fig 20). 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.
Fig 20 - Solar thermal cut-out wiring
SOLAR
THERMAL
CUT-OUT
POWER SUPPLY TO
SOLAR CONTROLLER
L
N
SOLAR CUT-OUT
(LOWER) TERMINAL
HOUSING
SOLAR
CONTROLLER
31