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IT
ES
– Disconnect the valve VENT pressure test
point tube (5 fig. 21).
– Remove the cap (1) from the modulator.
PT
– Place the hot tap water potentiometer
knob at the maximum position.
GB
– Turn on the boiler using the four-way
switch and turn on a hot water tap all
the way.
– Remember that rotating clockwise will
increase pressure while rotating anti-
clockwise will diminish it.
– Adjust maximum pressure using the nut
(3) with a wrench to the maximum pres-
82
sure value indicated in Table 4.
– Do not adjust minimum pressure until
you have adjusted maximum pressure.
– Turn off the supply power to the modula-
tor, and keep the hot water tap turned
on.
– Lock the nut (3) in place, turn the screw
/nut (2) to the minimum pressure indi-
cated in Table 4.
– Turn off the boiler and turn it back on
again several times, keeping the hot
water tap turned on at all times and
checking that the maximum and mini-
SIT 845 SIGMA
1
3
2
KEY
1 Plastic tap
2 Minimum pressure adjusting nut
3 Maximum pressure adjusting nut
mum pressure values correspond to the
established values; correct the settings if
necessary.
– Adjust, checking that you have restored
the power to the modulator.
– Put the pipe back on the valve VENT
pressure test point.
– Remove the manometer, remembering
to tighten the screw for closing the pres-
sure test point.
– Put the plastic cap (1) back on the modu-
lator and seal with a drop of coloured
sealant if necessary.
HONEYWELL VK 4105M
SIEMENS GVU 50
Fig. 22/a
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