To Drain The D.h.w. Circuit Of The Boiler; Setting Gas Pressures; Reducing The Maximum Output To Meet The Central Heating Power Requirements - Savio 20/1 MFS User Manual

Servicing instructions
6.4

To drain the d.h.w. circuit of the boiler

1 Close the cold water inlet cock;
2 open the drain tap of d.h.w. system or a draw ---off tap;
3 open the d.h.w. circuit drainage cock indicated.
6.5

Setting gas pressures

IMPORTANT
minimum gas pressure mut be set after maximum setting.
1 Open the boiler and operate as explained in sect. 4.7 from step
1 to step 5;
Setting the maximum gas pressure
2 turn the protective hood " A"counter---clocwise and remove it
from the calibration system. Use a flat---edge screw driver to
help removal;
3 rotate adjustment control " B"to adjust the maximum gas pres-
sure to the prescribed value. Rotate the control clockwise to in-
crease the pressure.
Setting the minimum gas pressure
4 Turn off the electrical supply;
5 remove the connector " C"to the gas modulator and make it
safe;
6 turn on the electrical supply;
7 rotate adjustment control " D" to adjust to the minimum pressure
prescribed value. Rotating the control clockwise increases the
pressure;
8 make sure that both minimum and maximum gas pressures are
correctly set by disconnecting and re---connecting the con-
nector " C"to the gas modulator;
9 close the domestic hot water cock;
10 install the protective hood over the calibration system on the gas
moulator;
11 securely close the gas pressure test point
12 close the appliance.
6.6 Reducing the maximum output to meet
the central heating power requirements
1 Ensure electricity is switched off at main isolator;
2 turn the function switch as indicated;
rev. 17.09.93
A
B C
D
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