30532 Rev D
18
09-02
NASIM REAR DIRECT VENT DECORATIVE GAS APPLIANCE
Step 7. Remove Burner Orifice
Completely loosen the nut securing the orifice with a 5/
8 wrench. See Figure 34. Remove the orifice and
replace it with the propane orifice. Tighten the nut and
return all components to their original position. Test
for leaks between the valve and burner with the burner
lit as indicated in Step 9.
Step 8. Air Shutter Adjustments
To adjust the air shutter at the base of the burner tube/
neck loosen the ¼ screw, using either a ¼ nut driver
or stubby screwdriver. Slide the shutter fully open and
secure. See Figure 34.
Step 10. Checking the Pressure
The gas input, inlet gas supply pressure and manifold
pressure must be as indicated on the rating label
located in the control area of the appliance. Any other
input, inlet pressure or manifold pressure could cause
your gas appliance to operate other than intended and
could cause serious injury or property damage.
Standing Pilot Models:
Verify that the gas valve is set at the PILOT position.
Verify the inlet gas supply pressure by loosening the
screw located inside the inlet pressure tap. See
Figure 35. Connect a manometer to the inlet pressure
tap by pushing the manometer hose over the pressure
tap. Turn the valve to the ON position and turn the
burner on (with wall switch, remote, etc.). If the inlet gas
pressure is incorrect, do not adjust without specific
approval and instructions from the gas supplier.
Changing the inlet pressure may affect other
appliances in the residence. When finished, return the
valve to the PILOT position, disconnect the
manometer and tighten the inlet pressure tap screw.
Outlet Pressure
Verify that the gas valve is set at the
PILOT position. Verify the manifold pressure by
loosening the screw located inside the outlet pressure
tap. See Figure 35. Connect a manometer to the outlet
pressure tap by pushing the manometer hose over the
pressure tap. Turn the valve to the ON position, ignite
the appliance (with the wall switch, remote, etc.) and
ensure the pressure is between 3 and 4 water column
(optimum pressure is 3.5 WC) for natural gas and
between 10 and 11 water column (optimum pressure
is 10.0 WC) for propane. If the outlet gas pressure is
incorrect, contact the gas supplier or Heatilator
Technical Service Department. When finished, turn the
valve back to PILOT, disconnect the manometer and
tighten the outlet pressure tap screw.
Do not leave the pressure too low or too high. This will
create a safety hazard!
Step 9. Leak Test
This is important! Propane (LP) gas is heavy. If there is
an incomplete gas line connection the gas could leak
and settle to the lowest point and then accumulate. Such
a situation could be hazardous. Do not proceed until all
connections are checked and any leaks eliminated.
Turn on gas.
Test all gas connections for possible leaks by using a
soap and water solution or sniffer (turn on and calibrate
the sniffer, then place the sensor end of the sniffer
within 1/2 of each connection). If the soap/water or
sniffer indicates there is a leak, tighten and seal the
connection and then re-test.
Turn position indicator to pilot position and depress.
Press the push button ignitor and light the safety pilot.
Continue holding the position indicator in the
depressed position until pilot stays lit (approximately
45 seconds). Test for leaks at the pilot assembly using
one of the methods above.
Reattach the burner tube onto the orifice and secure it
with a screw at the opposite end. Turn position indicator
to the on position and test for leaks at the valve and
burner orifice using one of the methods above.
Figure 34
Burner Orifice/Air Shutter
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