OPERATING INSTRUCTIONS:
1. Choose a suitable, level place near the workstation and position the unit so that the arm assembly
will be placed near the source of pollution being generated.
2. Grasp the hood by the handle ring and position within 18” of the source of pollution.
3. Connect power (stated above in ELECTRICAL CONNECTIONS).
4. Adjust the hood to capture the maximum amount of contaminants. Periodically adjust the position
of the hood to keep it in maximum capture range.
PRESSURE SWITCH ADJUSTMENT:
1. The pressure switch which turns the light on with a differential pressure increase, should be wired
to poles L1 (red) and L2 (blue) at the time of installation with 230/460 volt source (See Wiring
Diagram).
2. The pressure switch is preset at the factory to indicate (light on) dirty filters, but may need
readjustment due to a desire for earlier or later filter changes, a different combination of filters, or
because the set point shifted during shipping. The pressure switch is also orientation sensitive. To
re-adjust the switch, remove the hole plug in the side of the unit for access to the adjustment
screw. Make sure filters and pre-filters are installed in unit. Turn the unit on and place a piece of
cardboard over the intake covering about 80% to 85% of the intake area. With a standard
screwdriver, turn the adjustment screw clockwise until the light goes off, or counterclockwise until
the light comes on.
3. For more time between filter changes (less air flow), cover slightly more of the opening, and for
less time between filter changes (more air flow), cover less of the opening.
GENERAL MAINTENANCE:
Occasionally check the condition of the drive belt for tightness and wear.
Check the bower bearings for unusual wear and the blower wheel for debris and dirt. Clean when
necessary.
Check the wiring for loose connections or for cracked insulation.
No lubrication is required for the motor because it is a permanent pre-lube design. Excessive
dirt/oil should be periodically removed.
Once per month grease the suction arm base assembly with a bearing grease listed to not react
with aluminum.
CHANGING FILTERS:
Always make sure that the unit is turned off before changing filters or servicing the unit.
1. The MA4210 is equipped with a filter change light or optional Magnehelic Gauge. If the differential
pressure has been set properly the light or gauge signals the need for examination for the filters.
2. When the light comes on, or gauge reads high differential pressure, turn the unit off and remove
the pre-filter only. Replace with a new pre-filter, making sure that the air flow directional arrow is
pointed toward the outlet end. Turn the unit back on. If the filter change light is off, or the gauge
reads low differential pressure, then the unit is operating properly.
