Buderus Logano US GC 144 II Installation And Service Instructions Manual page 18

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Final start-up procedures
▶ Turn gas valve ON/OFF knob clockwise to OFF position.
▶ Close main gas shut-off.
▶ Disconnect heating system from the power source and set the
thermostat to the lowest setting.
▶ Remove pressure measuring nipple and pressure gauge for
measuring gas pressure and orifice pressure from the gas valve, and
close the openings with the screw plugs.
Checking for leaks
▶ Open main gas shut-off.
▶ Set thermostat at least 10°F above ambient to establish a heat
demand.
▶ Turn main power switch ON.
▶ Turn gas valve ON/OFF knob counterclockwise to ON position.
▶ After the burner has lit check the gas valve including screw plugs for
leaks using soapy water. If no leaks are found, continue with the step
after the next step. If leaks are found, close gas shut-off and turn ON/
OFF knob on gas valve clockwise to the OFF position. Disconnect the
heating system from the power source and turn thermostat to its
lowest setting.
▶ Seal leaks. Repeat all steps in this paragraph.
▶ Carefully wipe away the soapy water to prevent corrosion caused by
the alkaline content of the soap.
WARNING: Risk to life due to leaking flue gases.
▶ Verify the functionality and operability of the vent
damper.
▶ Check the position of the vent damper. The damper must be fully
open (vertical). When burner is on flue gases must not escape from
the vent hood.
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3
2
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Fig. 27 Checking vent damper
[1] Open draft hood
[2] Vent connection
[3] Vent damper
[4] Damper blade position indicator
[5] Vent damper motor
[6] Flue gas collector
[7] Boiler
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Checking aquastat
Check the function of the maximum aquastat to make sure that it
switches the boiler off as soon as the boiler water temperature set at the
aquastat is reached. Record the result in the start-up protocol.
▶ Set aquastat to its desired setting.
▶ Replace front door and close.
Fig. 28 Checking temperature control
[1]
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6 720 804 440-27.1T
Adjustment keypad
Logano GC 144 II – 6 720 808 893 (2017/02)
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6 720 804 440-28.1T