Munchkin 399M - Manual (Page 38)

38
MAINTENANCE
in which case, a qualified plumber will need to be contacted to follow the Coil Cleaning Instructions
(Section D) included in this section to dissolve deposit and clean condensate line.
D. COMBUSTION CHAMBER COIL CLEANING INSTRUCTIONS*
*Before beginning this procedure, you must have on hand the following items:
– a nylon, stainless or brass brush (not steel)
– “Rydlyme” (recommended for best results) (available on line www.rydlyme.com) or “CLR”
(available at most hardware stores)
– Gloves, eye protection
1. Shut down the Munchkin by using the following steps:
a. Close the gas valve, shut down the unit and wait for the unit to be cool to the touch
b. Disconnect the condensate hose from the outside connection, (not from the Munchkin side),
so the flow can be observed.
c. Remove screws and loosen bracket holding gas valve in place.
d. Pull connector to the venturi by sliding gas valve to left, remembering to disconnect both
Molex connectors.
e. Remove the (6) 10MM nuts from the burner plate assembly to access the coils.
f.
Pull the entire burner plate assembly towards you, while removing or pushing aside any
wiring to allow the removal of the assembly.
2. Using a spray bottle filled with the recommeded product “Rydlyme” or “CLR”, spray liberally on the coils,
making sure the solution penetrates and funnels down through the condensate hose. If the condensate
hose is blocked, let the chemical penetrate for at least 15 minutes or until it drains.
3. Use the nylon, stainless or brass brush (do not use steel) and scrub coils to remove any buildup, then
vacuum the debris from the coils. WARNING: Follow precautions above.
4. Spray the coils with clear water, making sure to confine the spray to the area being cleaned (Try to avoid
getting the back cermic wall of the unit wet). Flush the combustion chamber with fresh water. At this
point, the Munchkin should be ready to power back up.
Before powering up the Munchkin follow the steps below
a. Re-install the burner assembly
b. Replace the (6) 10MM nuts to the burner plate
c. Re-connect the Molex connectors
DANGER
IT IS EXTREMELY IMPORTANT TO MAKE SURE THE EXHAUST VENT IS NO LONGER
BLOCKED. FAILURE TO DO SO MAY RESULT IN PERSONAL INJURY OR DEATH.
WARNING
The combustion chamber insulation in this product contains ceramic fiber material.
Ceramic fibers can be converted to cristobalite in very high temperature applications.
The International Agency for Research on Cancer (IARC) has concluded, “Crystalline
silica inhaled in the form of quartz or cristobalite from occupational sources is
carcinogenic to humans (Group1).”:
ƒ Avoid breathing dust and contact with skin and eyes.
• Use NIOSH certified dust respirator (N95). This
type of respirator is based on the OSHA
requirements for cristobalite at the time this
document was written. Other types of respirators
may be needed depending on the job site
conditions. Current NIOSH recommendations can
be found on the NIOSH website at
http://www.cdc.gov/niosh/homepage.html.
NIOSH approved respirators, manufacturers, and
phone numbers are also listed on this website.
• Wear long-sleeved, loose fitting clothing, gloves,
and eye protection.
ƒ Apply enough water to the combustion chamber
lining to prevent dust
ƒ Wash potentially contaminated clothes separately
from other clothing. Rinse clothes washer
thoroughly.
NIOSH stated First Aid.
ƒ Eye: Irrigate immediately
ƒ Breathing: Fresh air.