43
ORIFICE REMOVAL
The gas orifice is located on the gas train, between the
gas valve and the combustion blower.
1. Locate and close the external manual shut-off
valve.
2. Loosen the external gas union.
3. Locate and remove front door panel.
4. Locate and remove the (4) bolts & nuts holding the
gas orifice in place. See the figure above.
5. Carefully remove the gas orifice and do not mis-
place the o-rings attached to the flanges.
6. Inspect and/or replace the orifice with the correct
size.
Be sure that electrical service to the heater has prop-
er overload fuse or circuit breaker protection, wire size
and connections which comply with all applicable
codes.
VISUAL INSPECTION
ELECTRICAL
Flames can be observed through the sight glass next
to the igniter. A blue colored flame indicates normal
operation. At least every three months a visual inspec-
tion should be made.
CAUTION:
Prior to replacing any component,
make sure that the main gas, power, and pumps
are turned
OFF
.
COMBUSTION SETTINGS
Verify that the gas orifice matches the fuel type sup-
plied. The natural brass finish orifice is for natural gas
and the black oxide finish orifice is for Propane. Table
11 shows the desired ranges for CO
2
% and limits for
CO ppm. Follow the instructions from the Adjusting
Valve Manifold Pressure section to make adjustments.
Desired CO
2
% and max CO ppm apply to all firing
rates, but firing rate must be stable for a good reading
(fan RPM should not change more than 50 RPM while
taking a sample).
Fuel Type
CO
2
Range
(%)
CO Max
(PPM)
Natural Gas
8.6 – 9.2
100
Propane
9.5 – 10.1
100
IGNITER REMOVAL
NOTE:
Orifices for propane gas have a black oxide
finish.
1. Locate and remove the top panel.
2. Locate the igniter in front of the blower and burn-
er.
3. Locate and disconnect the high tension spark
cable from the igniter.
4. Using a 5/16” (8 mm) socket, remove the (2) bolts
holding the igniter down.
5. Using a flat screw driver, loosen the igniter brack-
et from the combustion chamber, preferably on
both sides.
6. Carefully remove the igniter from its location. In
order to remove the igniter without damaging the
refractory, it is necessary to rotate the igniter 90
degrees clockwise before lifting it out of the heater.
7. When replacing or inspecting the igniter, the gap
between the ground & spark tips should be 0.15”±
0.01” (3.81± 0.25 mm). The gap between the
spark and ground rods should be uniform and the
rods should not be distorted. Inspect the ceramic
insulator at the base of the spark rod carefully for
cracks, replace the igniter if any defects are found.
Fig. 34: Gas Train
Fig. 35: Igniter
Table 12: Combustion Settings
Fig. 33: Gas Valve
Summary of Contents for X94
Page 24: ...24 Fig 10 Outdoor Venting Fig 11 3 in 1 Multi Vent Adapter ...
Page 32: ...32 WIRING DIAGRAM Fig 26 Wiring Diagram ...
Page 33: ...33 SECTION 4 SERVICING INSTRUCTIONS GENERAL LOCATION OF CONTROLS Fig 27 Location of Controls ...
Page 46: ...46 SECTION 6 REPLACEMENT PARTS ...
Page 47: ...47 ...
