Aerovent IM-500 - Manual (Page 18)

18 Aerovent IM-500
LUBRICATION INSTRUCTIONS FOR FANS AND
BLOWERS
Bearings and grease lines on fans are lubricated on assembly.
When lubrication is required, add grease slowly while shaft
is rotating until grease comes rapidly out of the relief port
on the fitting. For extreme conditions lubricate according
to experience. Check lubrication table in Aerovent IM-100
for frequency recommendations.
LUBRICATING DOOR HINGES
Door hinges should be lubricated on a monthly basis even
though they are stainless steel to keep hinges from “freez-
ing up” due to lack of use. Apply oil at the hinge and work
the oil in by opening and closing the door several times.
LUBRICATION INSTRUCTIONS FOR MOTOR
Grease lubricated bearings as furnished are adequate for
a long period of operation without relubrication. A good
maintenance schedule for regreasing will vary depending
on motor size, speed, duty and environment. See lubrica-
tion table in IM-100.
The table suggests relubrication intervals for motors on
normal, steady running, light duty indoor loads in relatively
clean atmosphere at 40 o C (105 o F) ambient temperature
or less. Motors with no provision for lubrication are
equipped with sealed bearings and require no maintenance.
Motors mounted in inaccessible locations are provided
with extended grease lines to facilitate lubrication. They
are equipped with relief fittings to prevent overlubrication.
The grease lines are filled with lubricant at the factory.
SERVICE INSTRUCTIONS FOR FILTERS
If the unit is supplied with a dirty filter switch and light,
clean or replace the filters any time the dirty filter light
comes on.
Units which do not have a dirty filter warning light
should have the filters checked monthly. Clean or replace
if necessary. In dirty atmospheres, filter maintenance may
be required more often.
SERVICE INSTRUCTIONS FOR BURNERS
Generally, direct-fired burners tend to be self cleaning,
however, if the unit is installed in a severely dirty environ-
ment a periodic cleaning of the burner may be required.
Depending on the size of the burner it may not be prac-
tical to attempt to remove the burner from the unit. The
burner can still be cleaned by using the following steps:
1. Turn off gas and power. Remove the pilot and igniter
assembly from burner.
2. Break the gas union at the burner and isolate the burner
piping from the manifold piping.
3. Seal the open end of the manifold piping with duct tape
or other means to prevent dirt from entering the mani-
fold pipe and/or gas controls.
4. Using a high pressure air hose (40 to 80 psi) flush the
burner gas ports from the flame side of the burner.
Continue flushing until dust particles are removed.
NOTE: If air pressure alone is not sufficient to clean the
burner gas ports, the ports may be cleaned by using the
appropriately sized drill from a numbered drill set. Consult
Maxon literature at www.maxoncorp.com for the proper
bit. NP-LE burners require different bits than that of an
NP (#47). See Figure 20.
When using a drill to clean the burner gas ports, be
careful not to distort or enlarge the ports.
5. Examine the stainless steel mixing plates carefully.
They should be clean and not warped or cracked. It
is especially important to make sure the mixing plates
nearest to the burner manifold are clear. Mixing plates
can be cleaned with compressed air or wire brush.
6. Remove the protective cover, which was placed on the
manifold piping in Step 3, and reconnect the gas union.
7. Reassemble pilot and igniter assembly to the burner.
8. After cleaning and reassembly, use a soap/water solu-
tion to check for gas leaks in the piping.
9. Restore power and gas to the unit. Reset pressure
switches.
10. Run the fan in the “Summer” position to see that the
damper is opening and closing properly. Be sure that
the gas is on and the proper pressure is indicated. Turn
the unit on in the “Winter” position and observe its
operation on the circuit analyzer. (If it is a warm day,
it will be necessary to increase the setting of the mild
weather thermostat in order to get the unit to fire.)
Watch the burner when it first lights. It should light off
with a low flame, then increase in size and stabilize out
somewhere in between. This would indicate that the
modulating system is working.
11. If you have cleaned the burner plates or if the burner
plates are dusty, there will be a lot of color in the flame
and luminous particles will be present. These will dis-
appear after the burner operates for a while.
If the unit fails to operate, refer to the section on trouble
shooting and analyze the problem. After you are satisfied
with the checkout, be sure to set the mild weather control to
the desired heat-off temperature. This is usually 60 o to 65 o .
GAS AND ELECTRIC CONTROLS
Inspect for general cleanliness and tightness of electric and
mechanical connections. Check gas valves a minimum of
once per year for tightness of the safety shut-off valves
using the leak test ports on the valves
*** CAUTION ***
KNOW WHICH BURNER
YOU HAVE PRIOR TO DRILLING