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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.
D. COMBUSTION CHAMBER COIL CLEANING INSTRUCTIONS*
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).":
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
http://www.cdc.gov/niosh/homepage.html.
NIOSH approved respirators, manufacturers, and
phone numbers are also listed on this website.
*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 the (4) screws on the aluminum ½" NPT connector on the gas valve.
d. Disconnect the poly hose connected to the combustion blower motor. (This does not apply
to T50/T80.)
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 con-
densate 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 ceramic 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 wiring
d. Re-connect the poly hose to the combustion blower motor. (Does not apply to the T50 or
T80.)
42
DANGER
WARNING
the
NIOSH
website
• Wear long-sleeved, loose fitting clothing, gloves,
and eye protection.
Apply enough water to the combustion chamber
lining to prevent dust
Wash potentially contaminated clothes separately
from
other
clothing.
thoroughly.
at
NIOSH stated First Aid.
Eye: Irrigate immediately
Breathing: Fresh air.
MAINTENANCE
Rinse
clothes
washer
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