Patterson-Kelley TBIG-03 owner manual 7.0MAINTENANCE, Maintenance

Maintenance

motorized gas valve (natural gas)

regulator*

pilot shutoff

natural gas connection manual shutoff

low gas

pressure switch*

propane connection manual

pilot regulator and solenoid valve

leak test valves

mechanical link to control air (Lo-Hi-Lo only)

burner

pressure tap

secondary shutoff, manual

high gas pressure switch*

motorized gas valve

shutoff

regulator *

low gas

pressure switch*

n.o. vent valve
(I.R.I. only)	Items with symbol must be
motorized gas valve	vented to outside.*	Refer to the
	drawings packed with your
(propane)
	boiler for additional information.

Figure 7-1 Piping Schematic for the Twin-Fuel Gas Train

7.0MAINTENANCE

7.1GENERAL

Warning! High voltage! Shock hazard. Properly lock- out/tagout the electrical service and all other energy sources before working on or near the machine.

For testing control circuits only, the service power shutoff switch (located inside the auxiliary panel) may be used to de-energize the system in lieu of normal lockout/tagout procedures. Use extreme caution when using this alternative.

- 15 -

service power shutoff switch

Figure 7-2 Service Power Shutoff Switch (located inside the auxiliary panel at the back of the boiler)

Maintenance of the twin-fuel gas boiler is similar to that of the standard model. Refer to pages 11 through 14 of the “Installation and Owner’s Manual - TBIG.”