Installation - Auxillary Heating Coil - Heatrae Sadia PremierPlus PES170D Installation And User Manual

6.0 INSTALLATION - AUXILLARY HEATING COIL

6.1 PLUMBING CONNECTIONS
Indirect units require the following pipework connections.
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Cold water supply to and from inlet controls.
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Outlet to hot water draw off points.
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Discharge pipework from valve outlets to tundish
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Connection to the auxillary primary circuit.
Primary connections are 22mm compression. However, 3/4"BSP parallel threaded fittings can be fitted to the pri-
mary coil connections if required.
6.2 ELECTRICAL SUPPLY (FIG. 6)
All Indirect units are fitted with a 3kW immersion heater and a combined thermostat and thermal cut-out to control
the primary heating source. The PremierPlus Solar MUST be earthed.
All wiring to the unit must be installed in accordance with the latest IEE Wiring Regulations and the supply circuits
must be protected by a suitable fuse and double pole isolating switch with a contact separation of at least 3mm in
both poles. All connections are made to the terminal block located under the terminal cover mounted on the side
of the unit. The supply cable(s) must be routed through the cable grip(s) in the terminal housing.
DISCONNECT FROM MAINS SUPPLY BEFORE REMOVING ANY COVERS. DO NOT BYPASS THE THERMAL CUT-OUTS IN
ANY CIRCUMSTANCES. Ensure the thermostat and thermal cut-out sensing bulbs are pushed fully into the pockets
on the element plate assembly.
6.3 BOILER SELECTION
The boiler should have a control thermostat and non self-resetting thermal cut-out and be compatible with unvented
storage water heaters.
Where use of a boiler without a thermal cut-out is unavoidable a "low head" open vented primary circuit should be
used. The Feed and Expansion cistern head above the PremierPlus solar should not exceed 2.5m.
6.4 AUXILLARY CIRCUIT CONTROL
The 2 port motorised valve supplied with the PremierPlus solar indirect units MUST be fitted to the primary auxillary
circuit flow to the PremierPlus solar heat exchanger and wired in series with the indirect thermostat and thermal
cut-out fitted to the unit.
Primary circulation to the PremierPlus Solar heat exchangers must be pumped, gravity circulation WILL NOT
WORK.
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