Troubleshooting
39
Greentherm T9800 SEO 160/199 | SECO 199 – 6 720 817 281 (2018/12)
▶ Remove the front of the appliance (see page 11).
Fig. 38 Pressure head points
[1] Air pressure head in the box
[2] Gas pressure head in the burner
[3] Tee (installer supplied)
▶ Loosen the shutter screw of the pressure head point [B].
▶ Connect the pressure gauge connection "+" to the test
point [B].
▶ Loosen the shutter screw of the pressure head point [A].
▶ Connect the pressure gauge "-" to the pressure head point
[A].
▶ Turn On the appliance.
▶ Open all hot water taps to achieve a flow rate of at least 6
gallons per minute. (1 tub and 2 sinks should be sufficient).
If tap symbol appears on the screen, open more hot water
fixtures to allow sufficient flow and access to P1 menu.
▶ Record the manifold gas pressure reading in table 17.
Manifold gas pressure refers to the relative pressure
between gas manifold nozzles inlet and outlet [A]-[B].
Table 17
▶ Turn Off the appliance.
▶ Disconnect the pressure gauges from the pressure heads
points [A] and [B].
▶ Tighten the shutter screws of the pressure heads points [A]
and [B].
▶ Place front cover in the appliance.
▶ Turn ON the appliance to return to normal operation.
8.11 Adjusting Gas/Air flow
DANGER:
Risk of CO poisoning!
Gas air/flow adjustment is performed with the front cover of the
appliance removed. Avoid exposure to exhaust vent gases. Do
not stand in front of the exhaust vent while appliance is
operating.
Appliance is pre-adjusted by default with factory
parameters.
Gas/Air adjustments are only required when;
• After installation, the appliance shows repeated
unresolved errors ( chapter 9).
• After replacement of electronic control unit, fan or gas
valve.
Improper gas pressure will affect combustion.
▶ Please see chapter 4.13 for more information.
8.11.1 Automatic adjust of Gas/Air flow
▶ Press and hold simultaneously buttons , and
for 3 seconds.
▶ Press the buttons or to select UC (Combustion
Automatic Adjustment) menu.
▶ Press the button to enter UC menu.
Automatic adjustment will begin.
Value Date
Manifold gas
pressure
To Next Page
Loading...
