Sime Format System 25 HE, Инструкции по установке и обслуживанию

Страница: 16 / 32

14
clockwise; to reduce it turn the screw
anti-clockwise.
6) Adjust gas capacity step (7) in order to
achieve a C0
2
value of 8.9% for natural
gas or of 9.8% for propane. To reduce
C0
2
value, turn the screw clockwise.
7) Go to maximum power by turning
clockwise trimmer (6) as far as it will
go.
8) Adjust the trimmer (2) and check that
the Hertz value of the fan is between
172 and 176.
9) Check that C0
2
value is approx. 9.0%
for natural gas or 10.0% for propane. In
case the value would not be correct,
repeat calibration procedure as men-
tioned in point 4.
4.5 CALIBRATION PROCEDURE
IN HEATING PHASE
USING MBAR
1) Adjust air pressure (fan speed)
Connect the positive of the manometer to
the positive test point of sealed chamber (7
fig. 3). Disconnect the SM sensor and con-
nect a loose one free in air, or activate the
chimney sweep function.
Sequence (Fig. 20)
- Turn the heating output potentiometer to
maximum output.
- Turn the heating output trimmer B to mini-
mum.
- Adjust the minimum air pressure using
fan speed trimmer A.
- Fully open a domestic hot water tap.
- Adjust the maximum air pressure using
fan speed trimmer D (2 fig. 20).
2) Adjust gas pressure
Connect the positive of the manometer to
the gas test point (6 fig. 3).
Sequence (Fig. 20)
- Turn heating output potentiometer to
maximum output.
- Turn the heating power trimmer B to mini-
mum.
- Adjust the minimum gas pressure using
the OFF-SET (8) on the gas valve.
- Fully open a domestic hot water tap.
- Adjust the maximum gas pressure using
the gas valve shutter (7).
Very important: It’s not necessary to adjust
the gas pressure or the fan speed should
the boiler be converted to another gas (ie
natural gas to LPG) only the injector will
require changing.
4.6 DISASSEMBLY OF
EXPANSION VESSEL
To disassemble the expansion vessel, pro-
ceed as follows:
– Make sure that the water has been emp-
tied out of the boiler.
– Unscrew the connection and the locknut.
– Remove the expansion vessel.
Before refilling the system, using a pres-
sure gauge attached to the valve make sure
that the expansion vessel is preloaded at a
pressure of 0.8 to 1 bar.
4.7 REMOVAL OF OUTER
CASING
It is possible to completely disassemble the
shell for an easy maintenance of the boiler
as showed in fig. 21.
7 8
6
2
4
Fig. 20
KEY
2
MAX fan speed trimmer
4 MIN fan speed trimmer
6 Heating power trimmer
7 Shutter
8 OFF-SET
AIR PRESSURE
Minimum Maximum
(mm H
2
O) (mm H
2
O)
12.5/13.5 76/78
GAS PRESSURE
Minimum Maximum
(mm H
2
O) (mm H
2
O)
10.5/11.5 65/67
Natural gas LPG
Minimum output 8.7/9.3 9.7/10.3
Maximum output 8.7/9.3 9.7/10.3
- To adjust CO
2
at maximum output adjust the
gas valve OFF-SET.
- To adjust CO
2
at minimum output to ajust the
gas valve shutter.
CO
2
VALUE %
1
2
Fig. 21