Model G3B Gas burner — Instruction manual
MNG3B Gas 041015
8
1. Prepare Site • Prepare Burner • Mount Burner
(continued)
Mount burner in appliance
• Verify appliance burner front plate dimensions per page 21.
• Slide gasket supplied with burner over end of air tube.
• Insert burner into appliance opening and bolt in place.
Inspect burner and components
Drill or ream gas orifice to size (initial installation)
You must disconnect power to burner and close main manual
gas valve before proceeding. Failure to do so could result
in severe personal injury, death or substantial property
damage.
You must drill or ream the burner orifice to the size given in
Figure 4. The orifice is shipped with a pilot hole only. Firing the
burner with the orifice as shipped can result in damage to the
burner. Never fire the G3B burner below 60,000 Btuh input.
The flameholder can overheat, resulting in potential severe
personal injury, death or substantial property damage.
1. After drilling or reaming orifice to correct size, thread orifice fitting into
orifice nipple as shown in Figure 4.
Install gas valve on burner
1. Read WARNING’s on page 9 before installing gas valve.
2. Apply a small amount of pipe dope (suitable for propane gas) to gas
valve outlet connection, gas line elbow and orifice nipple. Assemble
elbow and orifice nipple to gas valve.
To avoid damage to gas valve, do not hold valve with a pipe
wrench or over-tighten. Use only a crescent wrench or other
means. Failure to comply could result in severe personal
injury, death or substantial property damage.
3. Insert orifice nipple into burner gas connection and secure in place
using the two Allen screws.
4. Connect gas valve wires to gas valve.
Inspect/redrill gas orifice when required
1. Turn off power to the burner/appliance before proceeding.
2. Close main manual gas valve in gas line to burner. Then disconnect the
ground joint union to allow rotating burner combination gas valve.
You must disconnect power to burner and close main manual
gas valve before proceeding. Failure to do so could result
in severe personal injury, death or substantial property
damage.
3. Loosen Allen screws securing gas line to burner gas connection.
4. Remove combination gas valve (item 9, page 3) and gas piping to burner
gas connection (item 8, page 3) on burner air tube.
5. Read correct orifice drill size from Figure 4. Then check actual orifice
size using that size twist drill bit.
•
If gas orifice is smaller than required
, redrill orifice to correct size,
if necessary. Replace gas valve and piping, using only pipe dope listed
for use with liquefied petroleum gases.
•
If gas orifice is larger than required
, obtain a replacement gas orifice
fitting. Drill orifice hole in replacement orifice fitting.
Hot surface ignitor
• Inspect the burner from air tube end. The hot surface ignitor must extend
slightly past the end of the burner.
• Carefully inspect the ignitor, ensuring it is intact, with no cracks or visual
signs of degradation.
• Do not touch the ignitor with bare hands. Body oils can cause deterioration
of the silicon carbide.
• Replace ignitor if there are any signs of damage.
You must allow ignitor to cool before attempting to handle.
Failure to do so could result in severe personal injury or
damage to the ignitor.
Inspect components and wiring
• Visually inspect all burner components and wiring.
• Verify that wiring is intact and leads are securely connected.
• Verify that all burner components are in good condition.
Figure 4
Orifice and gas valve installation
Input
Btuh
Burner orifice drill size
Diameter, inches
Air throttle
turns (appr.)
Notes 1 & 2
Note 1
Natural Gas
Propane Gas
60,000
#28 (0.141)
#33 (0.113)
0
70,000
#24 (0.152)
Z\,
(0.125)
½
80,000
#20 (0.161)
#30 (0.129)
¾
90,000
#17 (0.173)
#28 (0.141)
1
100,000
#14 (0.182)
#25 (0.150)
1½
110,000
#11 (0.191)
#22 (0.157)
1¾
120,000
#7 (0.201)
#20 (0.161)
2¼
140,000
#3 (0.213)
#16 (0.177)
3
160,000
A (0.234)
#12 (0.189)
4¼
180,000
D (0.246)
#7 (0.201)
9
Note 1: High altitude applications: The maximum burner input at sea level is 180,000 Btuh.
Reduce this capacity by 4% per 1,000 feet above sea level. Example — max.
capacity at 5,000 feet is 144,000 Btuh (20% reduction).
Note 2: Use this as the starting setting only. Adjust air throttle, if necessary, after performing
combustion testing (see page 14).