Use And Maintenance - Sime EKO OF Serie Para El Instalador

IT
GB
FR
BE
100
DE
90
80
ES
70
60
50
40
30
20
10
0
0 500 1000
4 INSTRUCTIONS FOR USE AND MAINTENANCE
4. 1 GAS VALVE (fig.9)
The 'EKO OF' boilers have HONEYWELL
VR 4601 and VRB 25PA gas valve with
a coil assembly which permits, through a
double-contact regulating thermostat, a
reduction in output corresponding to
approx. 75% (G20) and 85% (G31) of
nominal output before the burner goes
out completely.
The operating pressures is calibrated by
SIME in the factory.
Consequently these operating pressures
should not be altered.
Only when you switch to another type of
gas is it permitted to alter the operating
pressures (Table 1).
This operation should be carried out
exclusively by authorized technical
staff, or the guarantee will be nullified.
When the working pressures have been
adjusted, reseal the regulators.
When the gas pressures are to be reset,
this must be done following a set order:
first the maximum pressure and then the
minimum.
32
"EKO 3/6 OF"
5 OF 6 OF
3 OF
1500 2000 2500 3000 3500 4000
Flow rate l/h Portata l/h
("EKO 3/7 OF - 3/4 OF PVA")
160
140
120
100
80
4 OF
70
60
50
40
30
20
10
0
4500
1500
0 500 1000
HONEYWELL VR 4601
KEY
1 Coil EV1
2 Pressure regulator
3 Coil assembly
4 Coil EV2
7 Pressure inlet upstream
"EKO 7/12 OF"
2000 2500 3000 3500 4000 4500
Flow rate l/h
HONEYWELL VRB 25PA
("EKO 8/12 OF")
9
8
8 Pressure inlet downstream
9 Gas pressure switch of
minimum rate ( a knob with
a range between 5 to 40
mbar)
7 OF
8 OF
9 OF
10 OF
11 OF
12 OF
6000
5000 5500
Portata l/h
Fig. 8/a
7
1
4
2
3
Fig. 9