P-K MACH
®
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905981 P-K MACH C1500H-C4000 Installation and
Owners Manual (Rev F Jan-2020).docx
Page 65
6.2.2 MACH C-2500, C-3000 & C-4000
1. Lockout/tagout gas supply to the boiler.
2. Lockout/tagout electrical power to the boiler.
3. Disconnect the condensate neutralization tank piping in order to install a temporary drain hose
into the condensate drain. Run the open end of this hose to a nearby floor drain.
4. Open the front and right side doors of the boiler.
5. Protect the electrical and control components from exposure to water with towels, a nylon tarp,
or plastic wrap.
6. Remove the wires/cables from the ignition electrode and flame/ionization rod.
7. Locate the right angle burner hood casting located directly in the front of the boiler connected to
the burner hole. Refer to Section
for an illustration of these components.
8.
Remove the eight 3/8”-16 bolts and flat washers connecting the right angle burner hood casting
to the air plenum casting.
9. Remove four M12 flanged nuts connecting right angle burner hood casting to the four burner
studs.
10. Gently remove the right angle burner hood casting out the front door.
11. Gently remove the burner gasket and set aside. If the gasket is torn or damaged, discard this
gasket.
12. Carefully remove the burner from the boiler and clean with pressurized water.
13. Now that the burner is removed, the burner hole is open which provides access to the
combustion chamber.
14. Use a pressurized water hose with control nozzle. Begin by spraying just a few seconds of
water into the combustion chamber and then close off the nozzle.
15. Walk around to the rear of the boiler and ensure the wash water is draining into the temporary
drain hose off the condensate drain. Adjust the temporary drain hose if needed to help drain the
wash water from the boiler.
16. After inspecting the temporary drain hose, continue washing the internal combustion chamber
with pressurized water for several minutes. Spray as much of the internal surface area as
possible.
17. After several minutes of washing, turn off the hose and allow all the wash water to drain from
the boiler.
18. Move to the right hand side of the boiler, and remove one of the rectangular fireside inspection
covers in the middle of the boiler by loosening the six M6 nuts.
NOTE
Do not attempt to wash the burner while installed in the boiler. When cleaning the burner, use a
mild detergent such as Simple Green to help loosen built-up debris trapped in the burner mesh.
Be very careful when cleaning to avoid spraying any of the electrical or control components.
