Nortek G7 Series - Important Notes; Gas Pressure Adjustment; Fire or Explosion Hazard

5
Lighting & Adjustment of the Appliance
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Never test for gas leaks with an open flame.
Use a commercially available soap solution
made specifically for the detection of leaks
to check all connections. A fire or explosion
may result causing property damage, personal
injury or loss of life.
AVERTISSEMENT :
RISQUE D’INDENDIE OU D’EXPLOSION
Le non-respect des avertissements de sécurité
pourrait entraîner des blessures graves, la mort ou
des dommages matériels.
Ne jamais utiliser une flamme nue pour vérifier la
présence de fuites de gaz. Pour la vérification de tous
les joints, utiliser plutôt une solution savonneuse
commerciale fabriquée spécifiquement pour la
détection des fuites de gaz. Un incendie ou une
explosion peut entraîner des dommages matériels,
des blessures ou la mort.
1. Turn ON the manual gas valve, located on the outside of
the unit to the ON position.
2. Check all gas connections for leaks with a soap and water
solution. If the solution bubbles there is a gas leak which
must be corrected.
3. Turn on the electrical power to the appliance.
4. Place the gas valve ON/OFF switch/knob to the ON position.
See Figure 6.
5. Set the thermostat above room temperature to begin the
heating cycle of the furnace.
6. Check that the furnace ignites and operates properly. Refer
to the installation instructions provided with the unit for the
normal operating sequence.
7. After ignition, visually inspect the burner assembly to
ensure that the flame is drawn directly into the center of
the heat exchanger tube. In a properly adjusted burner
assembly, the flame color should be blue with some light
yellow streaks near the outer portions of the flame.
NOTE: The ignitor may not ignite the gas until all air is bled
from the gas line. If the ignition control locks out, turn the
thermostat to its lowest setting and wait one minute then
turn the thermostat above room temperature and the ignitor
will try again to ignite the main burners. This process may
have to be repeated several times before the burners will
ignite. After the burners are lit, check all gas connections
for leaks again with the soap and water solution.
High Fire
Cap Screw
High Fire
Adjustment Scr
ew
Low Fire
Cap Screw
Low Fire
Adjustment Scr
ew
Spring
Spring
Figure 5. Pressure Regulator Spring &
Adjustment Screw Removal
Model VR9205Q1127
IMPORTANT NOTES:
• When converting to LP/Propane gas from natural gas,
the springs from gas valve must be replaced by the
larger springs from the kit. The LP/Propane springs
for both HIGH & LOW fire are the same size, shape
and color.
• Use only a Torx-25 or 3/16” flathead screwdriver when
removing adjustment screws or during pressure
adjustment.
1. Remove the HIGH fire cap screw. See Figure 5.
2. Remove and discard the HIGH fire adjustment screw from
the gas valve.
3. Remove the spring from the gas valve and discard.
4. Install a larger spring from the conversion kit.
5. Install a new adjusting screw from the kit.
6. Repeat steps 1 - 5 for replacement of the LOW fire spring
and adjustment screw.
7. Check and adjust the regulator setting. See Gas Pressure
Adjustment Section.
8. Reinstall the cap screws on the HIGH and LOW regulators.
Plastic replacement cap screws are provided in the
conversion kit.
9. Affix the label from the conversion kit to the gas valve.
GAS PRESSURE ADJUSTMENT
Measuring the Supply Gas Pressure
1. Turn OFF the gas supply at the manual valve located on
the outside of the unit.
2. Using a 3/16“ Allen wrench, remove the plug from the
inlet pressure tap (INLET side of gas valve). See Figure
6 (page 6).
3. Install an 1/8” NPT pipe thread fitting, which is compatible
with a Manometer or similar pressure gauge.
4. Connect the Manometer or pressure gauge to the Inlet
Pressure Tap.
5. Turn ON the main gas supply at the manual valve.
6. Check and adjust the incoming gas line pressure to 11.0-
14.0 inches Water Column for LP/Propane gas.
7. Turn OFF the gas supply at the manual valve.
8. Disconnect the Manometer or pressure gauge.
9. Remove the NPT fitting and reinstall the INLET pressure
tap plug. Hand tighten the plug first to prevent cross-
threading. Tighten with 3/16” Allen wrench.