geminox THI 2-17 B 120, Technical Instructions

Page: 5 / 24

- 5 -
FLOW AND SERVICE PRESSURE CONTROL
B
23
chimney flue :
- Combustion control is carried out on the combus-
tion product outlet system external and directly at
the boiler outlet (with the boiler unit assembled).
This opening must be closed again after checking
C
13
- C
33
balanced flue :
- Combustion control is carried out on the boiler
through the opening (23) provided for this purpo-
se after the cap is removed. This opening must be
closed again after checking.
- To commission the burner:
• Activate the regulator shut-down function - ser-
vice key (6) (section 3.11 - page 18 -
chapter III - OPERATION - INSTALLATION
MANUAL) :
. the code
flashes on the dis-
play screen (13),
- Gradually position the d.h.w. potentiometer (3) to
the maximum on the right:
• the burner switches to max. rate,
- Gradually move the V or 1 adjustment screw of
the gas unit (fig. 2 - page 4 - chapter I - FLOW
AND SERVICE PRESSURE CONTROL - SER-
VICING MANUAL) to obtain a stable flame.
- Check the CO
2
/CO ratio (see setting table
section 1.2 - page 6 - chapter I - FLOW AND
SERVICE PRESSURE CONTROL - SERVICING
MANUAL),
- Set the d.h.w. potentiometer (3) to the maximum
on the left:
• the burner switches to the minimum rate,
- Check the CO
2
/CO ratio (see setting table
section 1.2 - page 6 - chapter I - FLOW AND
SERVICE PRESSURE CONTROL - SERVICING
MANUAL),
- If necessary:
• adjust screw K or 2 (fig. 2 - page 4 - chapter I
- FLOW AND SERVICE PRESSURE CON-
TROL - SERVICING MANUAL) (tightening and
untightening increases and decreases gas
flow).
Before starting the minimum rate set-
ting (V or 1 and K or 2 screws), wait for
a stable CO
2
/CO analyser read-out. Re-
peat switching from the minimum rate
to the maximum rate several times to
ensure that the setting has been done
properly.
- to return to normal operation, press on the sweep
key (6) for 3 seconds then release it.
Note:
- Remember to reposition the d.h.w. potentiometer
(3) to its initial value to return to the required
d.h.w. setting.
1.1 - Surveillance procedure
Fig. 3
23
THI-126-0
C33 - Vertical flue
C13 - horizontal flue
!