11
2.3.3) Intermittent hot surface ignition pilot
1. Turn the gas knob to the “ON” position. The glow
rod on the pilot should begin to heat and when hot
enough, allow the gas to flow to the pilot. Once all
air is expelled from the pilot line, the pilot should
light;
2. The glow rod should turn off and the main gas valve
open the gas to the main burners.
2.4) Verifications and adjustments
Once the main burners are in operation the following
points MUST
be checked.
2.4.1) Manifold pressure
Install a pressure gauge downstream from the gas valve
on the pressure tap provided on the vertical section of
the gas train pipe. The pressure observed after 5
minutes of operation should correspond to the value
specified in Table 3.
If your gas train is equipped with a modulating gas valve
make sure that this valve is not modulating when the
reading is being taken.
If you need to adjust the pressure, do so by turning the
main setting screw on the gas valve.
TABLE 3
Pressures Manifold
Models Pressure ("W.C.)
Natural Gas
Pression ("W.C.)
Propane Gas
HGRC 068
@ 340
3.5 10.0
2.4.2) Pilot control safety checks
Constantly burning pilot
1. Cut the gas supply by moving the gas valve knob to
“OFF”;
2. The valve must close in the following 90 seconds.
You should hear a little CLICK.
Intermittent pilots (electronic and hot surface)
1. Cut the gas supply by moving the gas valve knob to
“OFF”;
2. The control circuit should close the valve within 1
second.
2.4.3) Temperature control limit check
Adjust the temperature control limit below the present
water temperature. The gas supply to the burners
should stop immediately. Set the control for a higher
temperature and the burners should come on again.
2.4.4) Modulating valve (if used)
With the boiler running, turn the thermostatic valve knob
through its various positions. The gas flow to the
burners should decrease when the selected setting
point is reached. Consult Table 4 to select the correct
valve setting for your needs.
TABLE 4
Temperature modulation
Selector
position
Modulation temperature
o
F (
o
C)
1 49°C (120°F)
2 57°C (135°F)
3 66°C (150°F)
4 74°C (165°F)
5 82°C (180°F)
6 91°C (195°F)
7 99°C (210°F)
8 107°C (225°F)
9 116°C (240°F)
2.4.5) Gas leaks
Check the whole system for gas leaks after the
installation is completed. Use a solution of soap and
water on the pipe joints.
DANGER
If there is an major leak is detected or the
smell of gas is strong :
1. Open the windows,
2. Do not activate any electrical switches,
3. Extinguish all flames,
4. Immediately call your gas supplier from
another building.
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