TOA Electronics DIRECT VENT 600 - Manual (Page 27)

27
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
SIT Millivolt Gas Valve
Pilot for SIT Millivolt Gas Valve
Pressure
Regulator
Remove
These
Components
Orifice Strip Tab
Pilot Hood Position After
Loosening Hex Fitting 1/4 Turn
Push Tab to Set
Gas Type Usage
Note - Orifice Strip Tab May
Be Randomly Located On Any
Side Of The Hex Fitting
Hood Alignment Hood
7/16 in. Open End Wrench
Orifice Strip Tab
Take Care Not to Contact the Orifice Strip Tab
with the Hex Fitting Wrench - Distortion of the Tab
May Render the Pilot Inoperative.
Figure 63
Figure 62
Pilot
Orifice
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.
Step 4. Millivolt Appliances - SIT Systems
a. Refer to Figure 62 and the instructions
provided with the kit. Using a Torx T20, remove
and discard the three pressure regulator mount-
ing screws. Remove the pressure regulator,
spring, poppet, diaphragm and bushing. Dis-
card all removed components. Ensure the
rubber gasket installed on the back of the
replacement pressure regulator is properly
positioned and install the new pressure regula-
tor using the new screws supplied with the kit.
Tighten screws to 25 In. lb. torque.
Step 1. Turn off the gas supply to the appliance.
Remove the front glass door/frame from the
appliance. Access the control compartment.
Step 2. Carefully remove the logs. Exercise
care so as not to break the logs.
Pilot for Honeywell Millivolt Gas Valve
(Loosening of Hex Fitting For Orifice Strip Tab Positioning)
Pilot for Honeywell Millivolt Gas Valve
Figure 66
Step 3. Locate the screws securing the burner
(tray) to the appliance. Remove the burner and
retain the securing screws.
Pilot for Honeywell Millivolt Gas Valve Orifice Strip Tab Positioning
Figure 64
Figure 65
Natural Gas Position -
NAT shown on tab
LP/Propane Gas Position -
1/16 in. Hole, LP and
Red Color shown on tab
NAT
P
L
Orifice Strip Tab Position Identification
For LP/Propane and Natural Gas
Top View of Hex Fitting and Orifice Strip Tab
c. Refer to Figure 63 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.