Maintenance
RRU-SVX01E-EN
45
Heater Annual Maintenance
At least a yearly inspection is recommended for heating
installations and more frequently for process applications
in year-round operation. Experience is the best guide in
determining frequency of inspect but as a minimum, the
following procedure should be followed.
1. Inspect the tightness of the gas safety shut-off valves
for the furnace by turning off the manual valve
upstream of the appliance combination control.
2. Remove the 1/8 in. pipe plug on the inlet side of the
combination control and connect a manometer to the
tapping.
3. Turn the manual valve ON to apply pressure to the
combination control.
4. Record the pressure reading on the manometer, then
turn the valve OFF.
5.
Leak check gas train gas train components.
6. Use a soap solution to check all threaded connections.
If no leak is found, the combination control may be
faulty and must be replaced before placing the
appliance back in service.
Burner Cleaning
1. Shut the system down totally, disconnecting or locking
out gas and electrical power supply.
2. Inspect the burner carefully, including upstream and
downstream sides of mixing plates as well as burner
body face.
Note:
The complete burner assembly may have to be
removed for proper inspection and cleaning. Any
accumulation of scale or foreign material on either
side of the mixing plates should be removed with
a wire brush. Visually check that no holes in the
mixing plates are blocked. If burner ports are
plugged (even partially) clear with a piece of wire.
Refer to
To clean the burner plates, use a stiff wire brush. Scrub
both sides of the stainless steel burner plates to
remove any soot or other crud, which may be on the
burner. All of the burner plate holes must be clear so air
can pass through them unrestricted. The holes in the
burner plate allow air to mix with the gas in increasing
amounts, as the flame gets longer. With brush in hand,
scrub the rust, soot and other foreign material from the
burner orifice area. Clean the burner gas and air ports
using a drill bit or piece of wire of the appropriate size.
See
for drill size. After the orifices are drilled to
the correct size and using compressed air or a vacuum,
remove any debris from the manifold. Debris left in the
manifold will prematurely clog the orifices in the
future.
Important:
Do NOT enlarge burner ports; doing so
could adversely affect equipment
performance.
3. If any mixing plates are loose or missing fasteners,
tighten/replace as necessary. Always use zinc plated or
stainless fasteners
Note:
The missing plates on the burner may display
hairline cracks. These cracks are normal and
caused by thermal stresses occurring during
combustion. The presence of these hairline cracks
in no significant way affects the combustion
efficiency or performance of the heater. Should a
large opening develop, the specific mixing plate or
plates must be replaced. Otherwise, it may cause
difficulties in cross ignition of flame across the face
of the burner.
4. Inspect the flame rod and ignition electrode for dirt and
moisture. Wipe off if necessary. Examine for any
evidence of premature arcing. If in doubt, check
continuity of flame rod to be sure it is not grounding
out. Replace if required.
5. The porcelain on the ignition electrode must be intact
(not cracked). The spark gap should be 1/8 in.
6. Inspect the support means to be sure that everything is
firmly anchored in-place.
WARNING
Hazardous Gases and Flammable Vapors!
Failure to observe the following instructions could
result in exposure to hazardous gases, fuel substances,
or substances from incomplete combustion, which
could result in death or serious injury. The state of
California has determined that these substances may
cause cancer, birth defects, or other reproductive harm.
Improper installation, adjustment, alteration, service or
use of this product could cause flammable mixtures or
lead to excessive carbon monoxide. To avoid hazardous
gases and flammable vapors follow proper installation
and setup of this product and all warnings as provided
in this manual.
WARNING
Hazardous Voltage and Gas!
Failure to turn off gas or disconnect power before
servicing could result in an explosion or electrocution
which could result in death or serious injury.
Turn off the gas supply and disconnect all electric
power, including remote disconnects, before servicing
the unit. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
Table 9.
Port drill sizes
Gas Port Drill Size
Air Port Drill Size
Wire Gauge
Decimal
Wire Gauge
Decimal
1/8 in.
0.125
42
0.093
Note:
HIMA-2A burner sections, natural/propane
