Armstrong World Industries 203, 243, 302, 242, 122, 123, 182, 183 manual 4 NOx Insert Removal

INSTALLATION Magic-Pak: HW/HWC

6-10

Units for operation with propane must be converted with a kit supplied by the manufacturer and require for operation an inlet pressure of 11" W.C. minimum and 14" W.C. maximum. A regulator is also required on the propane tank.

When converting a low NOx unit (designated by an L in the model num- ber) to propane, the NOx inserts must be removed. After removing the burners, remove the screw holding each insert and pull the insert from the combustion chamber (see Figure 6-4). The screws must be rein- stalled in the vest panel after the inserts are removed.

Low NOx Insert

FIGURE 6-4 NOx Insert Removal

WARNING

Never use a flame to check for gas leaks. Explosion causing injury or death may occur.

WARNING

The furnace must be isolated from the gas supply piping system by closing the individual manual shutoff valve during any pressure testing of gas supply piping system at test pressures equal to or less than 1/2 psig or 14" W.C. If the piping system is to be tested at pressures in excess of 1/2 psig, the furnace and its individual shutoff valve must be disconnected from the gas supply piping system. The gas valve supplied with this furnace is rated at 1/2 psig. Any higher pressure may rupture the pressure regulator diaphragm which will cause over firing of the burners and improper burner operation. This action may produce a high concentration of carbon monoxide which can result in asphyxiation.

SRM-HW/HWC

8/99