Enerco ERXL-100, ERXL-175L Section Gas Piping, Outside Combustion Air Supply, To burner gas inlet

Outside Combustion Air Supply

The Ener-Radiant XL heater is approved for installation with an outside air supply system. Some compounds such as halogenated hydrocarbons or other corrosive chemicals in the air can be drawn into the equipment and cause an accelerated rate of corrosion of some of the heater components. The use of such chemical compounds near the enclosure should be avoided.

IMPORTANT: If the building has a slight negative pressure or contaminants are present in the air, an outside combustion air supply to the heaters is strongly recommended.

For an outside air supply, a four (4”) inch O.D. single wall pipe may be attached to the heater. The duct may be up to forty-five (45’) ft. maximum length or two (2’) ft. minimum length with no more than two (2) elbows. (See General Requirements in page 21 for additional information.) An outside air supply should not be used with the draft hood venting configuration.

The air supply duct may have to be insulated to prevent condensation on the outer surface. The outside air terminal should be securely fastened to the outside wall by drilling four (4) 1/4” diameter holes in the outside flange; wood screws or bolts and expansion sleeves may be used to fasten terminal.

FIGURE 16: Non-Pressurized Outside Air Supply Duct

Outside Air Terminal: Use ACME #104 Enerco Stk. #19030.

PVC Pipe, “Dryer Hose”, or equivalent may be used instead of standard vent pipe.

Section 6

Gas Piping

Read applicable warnings in (Section 1) before proceeding with Gas Pipe installation. Improper installation may result in property damage, severe injury, or death.

Meter and service must be large enough to handle all the burners being installed plus any other connected load. The gas line which feed the system must be large enough to supply the required gas with a maximum pressure drop of 1/2” water column. When gas piping is not included in the layout drawing, the local gas supplier will usually help in planning the gas piping.

A 1/2” tapping at each burner location must be located and oriented as shown in (Figure 17). To check system pressure, put a plugged 1/8” NPT tapping in the gas line at the connection to the burner farthest from the supply. Before connecting the burners to the supply system, verify that all high pressure testing of the gas piping has been completed. Do not high pressure test the gas piping with the burners connected.

Follow these instructions to ensure a professional gas supply installation:

•Support all gas piping with suitable pipe hanging materials.

•Use wrought iron or wrought steel pipe and malleable iron fitting. All pipe fittings should be new and free from defects. Carefully ream the pipe and tubing ends to remove obstructions and burrs.

•Use L.P. gas-resistant joint compound on all pipe threads.

•Check the pipe and tubing ends for leaks before placing heating equipment into service. When checking for gas leaks, use soap and water solution:

NEVER USE AND OPEN FLAME.

Install the flex gas connector as shown. The flex gas connector accommodates expansion of the heating system and allows for easy installation and service of the burner.

FIGURE 17: Gas Line Connection with Stainless Steel Flex Gas Connector

Shut – off Valve	Shut-Off Valve must be parallel
	to burner gas inlet. The 2”
	displacement shown is for the cold
	condition. This displacement may
2"	reduce when the system is fired.
12"

		0°
1/2" Stainless Steel Flex Gas Connector
Stk. #16401	45°	45°
	90°

Enerco enerRadiant® XL Series Heater 19 Operating Instructions and Owner’s Manual