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▶ Check all combustion air and all flue gas ducts and openings. (
chapter 8, page 12 and chapter 9, page 13).
Verifying the appliance
Main gas orifice identification
Boiler size
18
Natural gas
285
LP
180
Table 9 Main gas orifice identification. These parts are only valid for the
U.S.A. from 0-8500ft in elevation.
▶ Fill heating system and bleed the complete system including all
radiators and zones.
▶ Open front door ( figure 19).
Fig. 19 Opening front door
Testing gas train for leaks
▶ Open gas manual shut off in the gas line.
▶ Check all gas connections and pipes to the gas valve for leaks using
soapy water. If no leaks are found, continue with the step after the
next step. If any leaks are found, close gas manual shut off.
▶ Seal leaks and repeat the previous step.
▶ Wait five (5) minutes until all gas has dissipated. Check for odor of gas
around the heating system. This test must also be conducted at floor
level, because some gas types are heavier than air and may
accumulate at floor level.
▶ Follow the safety information on the following pages.
For your own safety, read before boiler start-up.
WARNING: Risk to life due to not observing the start-up
instructions and resulting malfunction.
▶ If these instructions are not followed exactly, fire or
explosion may result causing serious property
damage, loss of life, or serious personal injury.
▶ Observe the installation instructions.
Logano GC 124 II – 6 720 804 440 (2012/11)
25
32
275
270
175
170
6 720 804 440-19.1T
Placing the heating system in operation
WARNING: Danger of explosion if you smell gas there is
danger of explosion!
▶ No open flame! No smoking!
▶ Prevent spark generation. Never operate electrical
switches, including telephones, plugs or door bells!
▶ Close main gas shut-off!
▶ Open windows and doors!
▶ Warn all occupants of the building!
▶ Evacuate the building!
▶ Call gas company, heating contractor or fire
department from outside the building.
This unit is equipped with an automatic igniter that starts
the burner. Do not attempt to ignite the burner manually.
WARNING: Risk to life due to water damage.
▶ Do not operate the unit if any part is or was
submerged in water.
▶ Contact a qualified customer service technician
immediately to have the unit checked and all parts of
the control and gas valves replaced that were in
contact with water.
11.1 Starting up the GC124 II
▶ STOP! First perform a leak test as described on page 15 of this
manual.
▶ First read the safety instructions on page 15 of this manual.
11.1.1 Prepare pressure measurement
▶ Remove the screw plug for the gas pressure measurement port on the
gas valve. Install pressure measuring nipple and attach a pressure
gauge to measure the gas pressure.
▶ Remove the screw plug for the orifice pressure measurement port on
the gas valve. Install pressure measuring nipple and attach a pressure
gauge to measure the orifice pressure.
▶ Open gas shut-off.
1
4
Fig. 20 Gas valve
[1]
ON/OFF knob (shown in ON position)
[2]
Screw plug for gas pressure measurement port
[3]
Screw plug for orifice measurement port
[4]
Ignition gas line connection
11
2
3
6 720 804 440-20.1T
15
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