Lochinvar EFW 85 Installation, Commissioning, User And Maintenance Instructions page 114

Installing the orifice (see also picture):
Required tools: wrench 55, hex key 5 mm and hex key 4 mm.
1. Close the external gas shutoff valve and disconnect the electrical
power before opening the heater.
2. Use a wrench to open the coupling in the gas line in the heater.
The three screws, with which the venturi is mounted onto the fan,
can now be removed.
3. Venturi and gas combination valve can now be separated. The ori-
fice is to be placed between venturi and gas combination valve.
The rounded side of the orifice must be on the side of the gas com-
bination valve.
The orifice must be mounted into the gas entrance of the venturi
and secured with the rubber gasket.
4. Venturi and gas combination valve can now be reconnected.
5. Remount the gas combination valve and the venturi onto the fan.
Close the union in the internal gas line.
6. Now open the external gas valve.
7. Check for gas leaks.
8. Reconnect the electrical power.
When in operation, check again for gas leaks on all parts that have
been apart.
114 E93.1804.014
Orifice
Sticker Gasket