Utica Boilers MGB Series II/MGC Series Installation Instruction

14

• Do not try to light any appliance.
• Do not touch any electrical switch; do not 

use any phone in your building.

• Immediately call your gas supplier from a 

neighbor’s phone.  Follow gas supplier’s 

instructions. 

• If you cannot reach your gas supplier, call 

the fire department.

  

Gas pipe to your boiler must be correct size for 

length of run and for total BTU per hour input of all 

gas utilization equipment connected to it. See Table 

5 for proper size. Be sure your gas line complies with 

local codes and gas company requirements.

Gas line enters boiler from right side.

• Use piping materials and joining methods 

acceptable to authority having jurisdiction.  In 

absence of such requirements National Fuel gas 

Code, ANSI Z223.1/NFPA 54

•  Use pipe joint compound suitable for LP gas on 

male threads only.

•  Use ground joint unions.
•  Install sediment trap upstream of gas controls.
•  Use two pipe wrenches when making connection 

to gas valve to keep it from turning.

•  Install manual shut-off valve in vertical pipe about 

5 feet above floor.

•  Tighten all joints securely.
•  Propane gas connections should only be made by 

licensed propane installer.

•  Two-stage regulation should be used by propane 

installer.

•  Propane gas piping should be checked out by 

propane installer.

Fire Hazard.  Do not use matches, candles, 

open flames, or other methods providing 

ignition source. Failure to comply will result in 

death or serious injury.

!  

Pressure test boiler and gas connection before placing 

boiler in operation.

•  Pressure test over 1/2 psig (3.5 kPa).  Disconnect 

boiler and its individual gas shutoff valve from gas 

supply system.

•  Pressure test at 1/2 psig (3.5 kPa) or less.  Isolate 

boiler from gas supply system by closing manual gas 

shutoff valve.

•  Locate leakage using gas detector, noncorrosive 

detection fluid, or other leak detection method 

acceptable to authority having jurisdiction.  Do 

not use matches, candles, open flames, or other 

methods providing ignition source.

•  Correct leaks immediately and retest.

NATURAL GAS

Pipe Capacity - BTU Per Hour Input 

Includes Fittings

Length of 

Pipe - FT

½”

¾”

1”

1¼”

20

92,000

190,000

350,000

625,000

40

63,000

130,000

245,000

445,000

60

50,000

105,000

195,000

365,000

PROPANE GAS

Pipe Capacity - BTU Per Hour Input 

Includes Fittings

Length of 

Pipe - FT

Copper Tubing *

Iron Pipe

⅝”

¾”

½”

¾”

20

131,000

216,000

189,000

393,000

40

90,000

145,000

129,000

267,000

60

72,000

121,000

103,000

217,000