Oil Supply - Viessmann PYROMAT ECO Technical Manual

Design information
A Burner pulled out with closed cover (solid fuel operation)
B Burner retracted (oil operation)
C Insulation

Oil supply

Single line system
Size the oil line in accordance with the following table. For this, observe
the oil line requirements to DIN 4755-2 [or local regulations].
The height differential H (see fig.) between the oil burner pump and
the foot valve in the tank set below the oil burner pump must not exceed
4 m. Greater height differentials lead to noisy operation and pump
wear.
An oil feed pump with intermediate tank is required in the immediate
vicinity of the boiler, if the suction head or maximum pipe run for tanks
set below the boiler is greater than that shown in the following table.
Site the intermediate tank so that the oil supply can occur using the
integral oil burner pump.
The oil feed pump must be regulated independently of the boiler, i.e.
no signal from the boiler must be used for this purpose.
The oil line should have a vacuum pressure of no more than
0.40 bar.
Anti-lift valve
■ Fuel oil tank systems where the highest possible fuel oil level inside
the tank is (or could become) higher than the lowest point of the fuel
oil suction line require an anti-lift valve.
■ Where a tank is set above (level of foot valve or floating inlet is higher
than the oil pump), do not install mechanical anti-lift valves. Instead,
use an electric solenoid valve.
■ When installing an anti-lift valve ensure that the negative pressure
on the inlet side of the oil burner pump will not exceed -0.4 bar in the
7
most unfavourable case.
46
(cont.)
355 70
160
100
110-160
M8
D Boiler jacket
E Limit switch
F Weight valve
A
Tank above oil burner pump
A Foot valve
B Fuel oil filter
C Fuel oil air vent valve
D Anti-lift valve
D
B C
PYROMAT ECO