8
OM-NGB/3
Initial Start-Up
After the unit has been installed, test it to ensure that it is operating properly.
1. Remove literature and packing material from the interior and exterior of the unit.
2. Make certain the water supply is turned on.
3. Turn on electrical power to the unit.
4. Make sure the gas supply line is open, and turn on the gas valve.
Turn the knob on the gas valve to the “ON” position.
NOTE: The “trial for ignition” period is approximately 90 seconds after the on/off
switch is turned to the “ON” position. (Refer to the Control Panel illustration in
the Operation Section).
During initial start-up several trials may be necessary to remove air from the gas
piping. Subsequent start-ups should only need about five seconds for the pilot to
light. If the pilot burner does not light within the trial period, the ignition system
will automatically stop gas flow to the pilot burner, and terminate the ignition
trial. If this happens, turn the switch to “OFF” and then “ON” again, to repeat the
trial for ignition.
5. Turn the on/off switch on the cabinet front panel to the “ON” position:
• The amber light in the switch will come on
• The boiler drain valve will close
• The unit will fill with water
When the water level reaches the “mid” probe, the red RESET light will come on.
Push the start switch.
• The green light in the switch will come on
• The RESET light will go out
• The main burner will light
When the water level reaches the “hi” probe, the water supply to the boiler will
shut off.
6. After about 15 minutes, the pressure on the gauge will rise. When the pressure
reaches 9- 1/2 PSI, the main burner will turn off. Thereafter, as pressure
decreases, the burner will automatically re-light to maintain the 9-1/2 PSI level.
The pilot burner should stay lit, even though the main burner cycles on and off.
7. To shut the unit down, turn the on/off switch to OFF. When it has cooled to
approximately 170ºF, the boiler will automatically drain.
The pilot is off when the on/off switch is OFF.
If the boiler functions as described above, it is ready for use. If it does not, contact
your authorized Groen Service Agent.
Operating Controls are located on the
front of the cabinet base unit.
