gledhill Torrent GreenHeat TGH140-OV Design, Installation & Servicing Instructions page 17

Immersion Heaters
These are 3kW 240V AC heaters and incorporate a thermostat. The thermostat
incorporating a 'single shot' overheat energy cut out which means it cannot be reset
and must be replaced if it has operated. They have incalloy elements to prolong their
life expectancy in aggressive water conditions.
The correct method of connecting the wiring to the immersion heater is shown opposite.
Utilising Off Peak Electricity
Where it is intended that units are fi tted to offpeak circuits, then suitable controllers
such as the Horstmann off peak electric time controller will be required. External
wiring to the immersion heaters must be in accordance with the relevant IEE Wiring
Regulations and the circuit must be protected by a suitable fuse and a double pole
isolating switch.
C3: DHW outlet – S4
C2: CW inlet – S3
C1: Store sensor – S6
230Vac, 50Hz, 500w
G1
C4
T1 N E L1
C5
G4
G2
Anti-scaling coil
Mains supply
Fuse rating: 3A
INSTALLATION
Safety
The immersion heaters must be earthed and
they must be isolated from the mains before
the cover is removed on every occasion.
Replacement immersion heaters should be
obtained from Gledhill Building Products
Limited.
Wiring The Control Panel
The control panel requires a separate 3 amp
fuse spur double pole to ensure safe isolation.
The cable/fl ex from the fuse spur to the control
panel must be a minimum of 0.75mm
and be heat resistant. The cable should be
clipped to prevent accidental snagging.
The control panel front cover is secured by 4
black screws. Remove these and lift off the front
cover to expose the power terminals. These are
found at the bottom left of the control panel.
Prepare the cable end and feed it through the
cable gland.
Use a screwdriver to press the neutral cross
down on the WAGO connector. This opens the
clamp and the neutral wire can be fed into the
connector. Remove the screwdriver and test the
wire is securely fi t. Repeat with the PE and live
cables. Tighten the cable gland and check for
security. Perform the necessary safety checks
and refi t the front panel.
Important
The unit must not be powered up unless the
G3
thermal store has been fi lled with water and
the pump has been bled.
To PHE modulating pump
Grundfos UPR 15-50
Page 17
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Immersion Heater Wiring
INSTALLATION
Thermostat
2
C.S.A.