GAS Service & Pipe Capacity

Picture 2: DIE CAST FLANGE: (picture to the left) Install the gasket and Die Cast flange to the boiler.

Tighten the bolts. Measure the boiler or furnace-mounting plate to determine the flame tube insertion depth required and make a mark on the tube (with a marker or screwdriver). Deduct ¼” from the total length and tighten the flange on the flame tube with the deducted insertion depth. The ¼” deduction will prevent the tip of the flame tube from burning off. Slide the blast tube into the boiler to the proper depth and tighten the two setscrews using a 4 mm allen key. Seal off any free openings with either high temperature cement or high temperature silicone.

Picture 2: BODY FLANGE: (picture to the left)

First, install the gasket and boiler flange to the boiler.

•For heat exchangers with a diamond stud pattern, one allen screw on the flange should be on the top, slightly to the left of the 12 o’clock stud. The second screw should be on the right (slightly above the 3 o’clock position stud). Tighten all the nuts equally. Make sure that the allen screws are backed out, to allow enough clearance. Then, insert the SU-2A gas burner into the boiler. Once the burner is inserted and pushed all the way forward, tighten the allen screw on the top of the flange. This screw MUST go into the grove that is on the burner housing. Tighten the second allen screw, located on the right side of the flange. This screw should be tight.

•For heat exchangers with a square stud pattern, move one of the allen screws so that both are under the top two boiler studs. Tighten the bolts and install the burner. Make sure the burner is straight and tighten the allen screws.

•Seal off any free openings with either high temperature cement or high temperature silicone.

Before connecting the burner to the gas supply, insure that the gas pipes and service meter are large enough to permit the additional load of the gas burner (see Chart 4).

Chart 4: Pipe Capacity Table*( x 1,000 BTU’s)

Nominal diameter of pipe in inches

Pipe Length**	¾”	1”	1 ¼”	1 ½”
15’	172	345	750
30’	120	241	535	850
45’	99	199	435	700
60’	86	173	380	610
75’	77	155	345	545
90’	70	141	310	490
105’	65	131	285	450
120’		120	270	380
150’		109	242	300
180’		100	225	225

*Using 0.6 Specific Gravity Gas and a Pressure Drop of 0.3” of Water Column

**Each 900 elbow counts as 3’ for the purpose of these calculations

GAS SERVICE & PIPE CAPACITY

180’