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LT5052 (ISS 5)
4: SURFACE MOUNTED Fan Housing – Fire sited in special surround or FALSE CHIMNEY BREAST
IMPORTANT: Study the enclosed Fan Unit Template carefully before INSTALLATION. The Fan unit must be fitted
with the fan outlet directed downwards (fig. 6).
Refer to fig 2, which shows the size of the cut out in the back panel of 390-420 mm wide by 560 mm high.
Drill a pilot hole through both inner and outer leaf at the required position. See fig. 3.
Using the template provided, position the light grey dot in the centre of the large circle over the pilot hole on the
outside brickwork.
Using a 127mm (5”) core drill, drill through both inner and outer leaf at the pilot hole position, shown by the
circular dotted line.
Using a suitably sized drill, also drill through both inner and outer leaf at the wiring harness position, shown by
the small circular dotted line.
Feed the wiring harness from the fire through a length of conduit, then feed the conduit and harness through
the small hole. Exposing approximately 100mm of the harness to feed in through the grommet at the rear of the
fan housing. IMPORTANT: DO
NOT
allow the wiring harness to lie against the firebox or the flue. They should be
suitably shielded against the heat.
The surface mount cover fig. 7, which slides over the back of the fan housing will be secured to the wall at the
positions shown by the grey dots using suitable fixings later.
Secure the fire into the opening, gas supply pipe, and electrical cable appropriately routed in accordance with
current regulations (
NOTE:
fire isolated from electrical supply at this time).
Remove the front cover from the housing and place to one side.
Disconnect the tubes from the pressure switch, making note of which tube fits on which outlet, (‘+’ on pressure
switch to upper venturi outlet, ‘-‘ on pressure switch to lower outlet on venturi). Refer to fig. 6.
Undo and slide away the fan and fan plate to expose the flueway.
Position the fan housing in the new opening and feed about 100 mm of the wiring harness through the grommet
at the rear of the housing.
The length of flue that is required is determined by measuring the distance between the back of the fire to the
fan housing flue stops.
With the flue pipe connected to the flue spigot on the back of the fire, fit the doughnut seal between the flue
pipe and flueway of the housing to ensure an airtight seal is made. Refer to fig 5.
The housing can now be secured to the wall using suitable fixings.
Carefully slide the fan and fan plate back into its position and secure.
Reconnect the tubes from the pressure switch to the venturi on the fan, (‘+’ on pressure switch to upper venturi
outlet, ‘-‘ on pressure switch to lower outlet on venturi). Refer to fig. 6. Ensure that the venturi is clean and clear
of any debris or obstructions prior to use.
Connect the leads from the pressure switch and fan to their respective tabs on the wiring harness.
Ensure that both earth leads from the fan and wiring harness are secured to the earth mounting point on the
housing. IMPORTANT:
THE APPLIANCE MUST BE EARTHED.
Fit the front cover over the housing and secure.
