9
9
INSTALLATION - AUXILLARY
HEATING COIL
PLUMBING CONNECTIONS
Indirect units require the following pipework
connections.
• Cold water supply to and from inlet controls.
• Outlet to hot water draw off points.
• Discharge pipework from valve outlets to tundish
• Connection to the auxillary primary circuit.
Primary connections are 22mm compression. However,
3/4”BSP parallel threaded fittings can be fitted to the
primary coil connections if required.
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 Pullin
Evolution 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 separa-
tion of at least 3mm in both poles. Connection to the
immersion heater thermostat(s) are made in
accordance with the ‘INSTALLATION - DIRECT
UNITS’ section. All auxillary heating source (boiler)
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.
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 Pullin Evolution Solar should
not exceed 2.5m.
AUXILLARY PRIMARY CIRCUIT CONTROL
The 2-port motorised valve supplied with the Pullin
Evolution Solar indirect units MUST be fitted to the
primary auxillary circuit flow to the Pullin Evolution
Solar heat exchanger and wired in series with the
indirect thermostat and thermal cut-out fitted to the
unit.
Primary circulation to the Pullin Evolution Solar heat
exchangers must be pumped; gravity circulation
WILL NOT WORK.
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