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b. Attach manometer to the manifold side
pressure test fitting and verify manifold pres-
sure reads 3.5 inches water column (0.87 kPa)
for natural gas, and 10.0 inches water column
(2.49 kPa) for propane gas.
c. Refer to Figure 33 and remove the pilot
hood assembly to access the hexed pilot ori-
fice. Remove and replace the orifice with the
one provided with the kit.
Pilot for SIT Millivolt Gas Valve
Pilot
Orifice
Figure 33
Step 5. Millivolt Appliances - Honeywell Systems
f i r e - p a r t s . c o m
a. Convert the gas valve as follows
( see Figure 34):
Remove the plastic protecting cap. Remove the
gas type setting screw by turning it counter-
clockwise. Obtain the replacement gas type
setting screw from the kit and screw it into
place (red for propane and blue for natural gas).
Tighten the gas type setting screw by turning it
clockwise. Replace the plastic protecting cap.
Honeywell Millivolt Gas Valve
Adjusting Knob
Regulator Cap
Conversion screw
(blue natural gas;
red LP/propane gas)
Figure 34
b. Attach manometer to the manifold side pres-
sure test fitting and verify manifold pressure
reads 3.5 inches water column (0.87 kPa) for
natural gas, and 10.0 inches water column
(2.49 kPa) for propane gas.
c. Convert the pilot orifice as follows (see
Figures 35, 36 and 37):
Note - Use extra care not to engage the
orifice strip with the 7/16" open end wrench
(contacting the orifice strip could cause strip
distortion rendering the pilot inoperative).
Also avoid wrench contact to any of the other
pilot parts.
Use a 7/16" open end wrench and turn the pilot
hex fitting counter-clockwise 1/4 turn. (See
Figure 35).
Note - The orifice strip tab may be randomly
located on any side of the hex fitting.
Pilot for Honeywell Millivolt Gas Valve
(Loosening of Hex Fitting For Orifice Strip Tab Positioning)
Hood
7/16 in. Open End Wrench
Orifice Strip Tab
Figure 35
Pilot for Honeywell Millivolt Gas Valve
LP/Propane Gas Position -
1/16 in. Hole, LP and
Red Color shown on tab
Top View of Hex Fitting and Orifice Strip Tab
Figure 36
Pilot for Honeywell Millivolt Gas Valve
Figure 37
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
d. Push the orifice strip tab all the way against
the hex fitting to align the appropriate gas type
orifice (see Figures 36 and 37) . The type of
gas for which the pilot is set, is, the gas type
shown on the tab.
e. Retighten, clockwise, the pilot hex fitting
until the pilot hood aligns with the thermo-
couple and thermopile as indicated by the
arrows shown in Figure 35.
Take Care Not to Contact the Orifice Strip Tab
with the Hex Fitting Wrench - Distortion of the Tab
May Render the Pilot Inoperative.
Orifice Strip Tab Position Identification
For LP/Propane and Natural Gas
Natural Gas Position -
Orifice Strip Tab Positioning
Pilot Hood Position After
Loosening Hex Fitting 1/4 Turn
Orifice Strip Tab
Push Tab to Set
Gas Type Usage
Note - Orifice Strip Tab May
Be Randomly Located On Any
Side Of The Hex Fitting
Hood Alignment
NAT shown on tab
15
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