Adjustments; Qualified Technicians); Factory Regulations; Pressure Regulation - Bosch T4200 14-2D Installation And User Instructions Manual

6 Adjustments (must be carried out only by

qualified technicians)

6.1

Factory regulations

Sealed parts must not be interfered with.
Natural gas
Heaters must not be turned on if the
connection pressure is lower than 1,5 kPa or
higher than 2,5 kPa.
Heaters for natural gas (G 20) are supplied sealed from the
factory after being adjusted to the values indicated on the type
plate.
Liquefied gas
The appliances must not be operated if the
dynamic connection pressure is:
- Propane: less than 2,5 kPa or greater than
4,5 kPa
-Butane: less than 2,0 kPa or greater than
3,5 kPa.
Heaters for propane/butane (G31/G30) are supplied sealed
from the factory after being adjusted to the values indicated on
the type plate.
DANGER: The following procedures must
only be performed by a qualified technician.
Power may be tuned according to the burner pressure process,
for which a manometer is required.
6.2

Pressure regulation

Access to the adjuster screw
▶ Remove the appliance front cover ( see section 5.3).
Connection of manometer
▶ Loosen the shutter screw.
Therm 4200 – 6 720 821 605 (2017/08)
Adjustments (must be carried out only by qualified technicians)
▶ Connect the manometer to the burner pressure measuring
point.
Fig. 14 Pressure measurement point
Maximum gas flow adjustment
▶ Remove the seal from the adjusting screw (Fig. 15).
▶ Turn on the heater with the power selector set to the left
(maximum position).
Fig. 15 Maximum gas flow adjusting screw
▶ Open several hot water taps.
▶ Using the adjusting screw (Fig. 15), regulate the pressure
until achieving the values indicated in the table 7.
▶ Seal the adjusting screw once again.
Minimum gas flow adjustment
The minimum gas flow adjustment is
performed automatically after the
adjustment of the maximum gas flow.
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6720607418-02.2V
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