53
on an annual basis. An appliance installed in a dust or dirt
contaminated environment will require inspection and
cleaning on a more frequent schedule. The fan assisted
combustion process may force airborne dust and dirt
contaminants, contained in the combustion air, into the
burner.
With
sustained
operation,
non-combustible
contaminants may reduce burner port area, reduce burner
input or cause non-warrantable damage to the burner.
Never operate this appliance during construction.
Airborne contaminants such as dust, dirt, concrete dust or
dry wall dust can be drawn into the burner with the
combustion air and block the burner port area.
9.7.1
Burner Removal and Cleaning
Access to the burner will require the following steps:
•
Turn off main electrical power to the appliance.
•
Turn off main manual gas shutoff to the
appliance
•
Remove the front cover.
•
Disconnect the gas supply to the fan inlet.
•
Disconnect the fan motor power wires at the
harness.
•
Remove the direct spark igniter and the flame
sensor.
•
Remove the T-25 screws holding the front burner
flange in place to gain access to the burner.
•
The burner can now be pulled horizontally out of
the heat exchanger cavity.
•
Use care to prevent damage to the knitted metal
fiber of the burner surface.
•
Wash the burner with water, such as a garden
hose. Never wipe or brush the surface of the
burner.
•
For optimal results immerse the burner port area
in a solution of dishwashing detergent and hot
water. DO NOT use chlorine based solvents or
cleaning agents on the burner. Allow the burner to
remain in the solution for a short period of time to
remove, dust, dirt and oil or grease laden
contaminants.
•
Rinse the burner thoroughly with clean water to
remove any residue from the detergent cleaner
•
The burner should be air dried after removal from
the cleaning solution and rinsing.
•
Check all gaskets and replace as necessary.
Gaskets affected by heat will not reseal properly
and must be replaced.
•
Replace the burner in the reverse order that it was
removed.
NOTE
When the combustion air fan is removed for any reason,
the inlet to the burner must be covered to prevent foreign
objects from falling into the burner. Always look inside the
burner to check for dents. Do not place a burner back into
operation if the inner distribution screen has been dented
during the service operation, call the factory for
recommendations. Use care when removing and handling
the burner, Sharp objects or impact may damage or tear
the metal fiber surface rendering the burner unfit for
service.
9.8
REMOVAL OF COMBUSTION CHAMBER
LINING
The combustion chamber insulation in this appliance
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 in this
form of quartz of cristobalite from occupational sources is
carcinogenic to humans (Group 1)”. Normal operating
temperatures in this appliance are below the level to
convert ceramic fibers to cristobalite. Abnormal operating
conditions would have to be created to convert the ceramic
fibers in this appliance to cristobalite.
The ceramic fiber material used in this appliance is an
irritant; when handling or replacing the ceramic materials it
is advisable that the installer follow these safety guidelines.
•
Avoid breathing dust and contact with skin and
eyes.
o
Use NIOSH certified dust respirator
(N95). This type of respirator is based on
the OSHA requirements for cristobalite at
the
time
this
documentation
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.
o
Wear long-sleeved, loose fitting clothing,
gloves, and eye protection
•
Apply enough water to the combustion chamber
lining to prevent airborne dust.
•
Remove the combustion chamber lining from the
water heater and place it in a plastic bag for
disposal.
•
Wash potentially contaminated clothes separately
from other clothing. Rinse clothes washer
thoroughly.
NIOSH stated First Aid
•
Eye: Irrigate immediately
•
Breathing: Fresh air
9.9
COMBUSTION AND VENTILATION AIR
Check frequently to be sure that the flow of combustion air
to the appliance is not obstructed. Unless air is piped
directly to the heater combustion air must be provided to
the mechanical room with openings sized per the
requirements of the current B149 or National Fuel Gas
Code. The DynaMax HS is setup to allow outdoor
combustion air to be connected directly to the appliance. It
is highly recommended that combustion air be connected
directly to the appliance. For installations in a common
boiler room with atmospheric appliances or if there is the
possibility of negative pressure in the boiler room, the air
inlet must be piped directly to the DynaMax HS.
