5
HYDRAULIC INSTALLATION
26
4.
Connect the volumetric charging pump to the union with a hose.
5.
Open the filler cock (Figure 5.4
→
26, detail C), with a flathead screwdriver, and charge the circuit with enough glycol solution
to achieve the specified optimal pressure.
Take care not to allow air to enter the circuit.
1.
Open the cap on the automatic bleed valve on the internal circuit and run the machine for 3 minutes to bleed the circuit.
2.
If the circuit gurgles during operation, this indicates that air is present in the circuit; connect a hose to the manual bleed cock
on the top of the combustion unit (Figure 5.4
→
26, detail A), open the cock by turning it counterclockwise and bleed the cir-
cuit. Once the circuit has stopped gurgling, close the cock and remove the hose.
During manual bleeding, any liquid which has been bled out of the circuit must be replaced with the charging pump. Make
sure that the circuit pressure is 1-2 bar on completion of the following procedure.
1.
Stop the circuit operating, close the charging cock with a flathead screwdriver and close the automatic bleed valve on the
circuit.
2.
Disconnect the volumetric pump, remove the union and replace the filler cap.
3.
Close the front panel with its retainer bolts.
4.
Restore the appliance and put away the union.
Figure 5�4 – Filling the machine's internal circuit
Detailed description of filling procedure.
LEGEND
A
manual air vent cock
B
pressure gauge
C
filler cock *
D
hose fitting D.13 standard supply
*
notch in horizontal position: cock closed;
notch in vertical position: cock open.
5�8
EXHAUST FLUE GAS
The appliance, which is supplied in the B53P configuration for installation in the open, is equipped as standard supply with a DN80
fumes kit (nominal diameter 80 mm).
The supplied fumes kit must be installed by the installation technician.
The DN80 union for connecting the fumes kit to the appliance is located at the top of the latter (see Figure 5.5
→
27) with a vertical
outlet.
