Utica Boilers MGB Series II/MGC Series Installation Instruction

P/N 240009725, Rev. C [10/2012]

Conversion kit shall be installed by qualifi ed service 

agency in accordance with manufacturer's instructions 

and all applicable codes and requirements of authority 

having jurisdiction. If information in these instructions 

is not followed exactly, a fi re, explosion or production 

of carbon monoxide may result causing personal injury 

or loss of life.  Qualifi ed service agency is responsible 

for proper installation of this kit.  Installation is not 

proper and complete until operation of converted 

appliance is checked as specifi ed in manufacturer's 

instructions supplied with the kit.

  

Follow instruction TO TURN OFF GAS TO APPLIANCE. 

Verify electrical power is OFF.

Remove front panel.

Remove burner access door.

Remove main gas burner tubes. See Figure 1.

Remove main burner orifi ces. See Figure 1.

Install LP gas main burner orifi ces. Discard excess LP 

orifi ces.

Use 7/16” wrench, disconnect pilot tube from pilot. See 

Figure 2.

Remove pilot orifi ce. 

Install LP gas pilot orifi ce. 

Apply liquid sealing compound (provided) to threads of 

pilot assembly fi tting.

Reattach pilot tube to pilot and securely tighten. See 

Figure 2.

Replace main gas burner tubes.

• Flat Head Screwdriver
• 1/4” Nut Driver
• 7/16” Open Ended Wrench
• 3/16” Allen Wrench
• 18” Manometer (or dial manometer)

Pilot

Pilot Orifi ce

Pilot Tube

Pilot Orifi ce - Spark

PB00208 (1)

Orifi ce 

# 47 (4)

# 50 (2)

# 49 (4)

Label, "Nat to LP" 

Conversion Plate 

240004822 (1)

Liquid Sealing 

Compound

140010 (1)

Spring Kit

1272030 (1)

Instructions

240009725 (1)