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4.2 Balancing Procedure
Before proceeding with balancing, all windows,
overhead doors and walk-in doors should be closed
and exhaust systems should be turned off.
The connections between the flow stations and the
ducts must be sealed with tape. Mount the magnehelic
gauge in a convenient location where it is level and
will not vibrate or be bumped. Zero the gauge.
Measure the exhaust air first as it is often the lowest
due to a longer duct system.
With the fan speed at maximum, connect the hoses
from the FMS to the magnehelic gauge. If the needle falls
below zero, reverse the hose connections. Ensure that
the damper is wide open. Take a reading from the
magnehelic gauge and record it. Remove the FMS
and place it in the supply duct. This process is not
necessary if the FMS is to be permanently mounted.
Repeat the procedure. If the reading is higher in
the supply duct, adjust the damper until the reading
is the same. If the reading is lower, return the FMS
to the exhaust duct and adjust the damper to obtain
the same reading as the supply duct.
5 Maintenance and Service
5.1 Bi-Monthly Maintenance
Bi-monthly maintenance should include:
Air Filters
The standard foam filters are washable. Under
normal conditions it is recommended that they be
cleaned every two months. More frequent cleaning
may be required under extremely dirty operating
conditions. Use a vacuum cleaner to remove the
heaviest portion of accumulated dirt, then wash with
warm water.
A medium efficiency filter for the supply air
stream is available from your supplier. This filter
is disposable and should be replaced when it
becomes dirty.
Drain Pans and Interior of Unit
With the filters removed from the unit, the foil
faced insulation surfaces and the drain pans should
be wiped clean with a soft cloth and mild cleaning
solution. Also ensure that the drain fittings are free
from dirt and are draining freely.
5.2 Annual Maintenance
Annual service should include:
Air Filters
Vacuum and wash standard foam filters. Replace
medium efficiency filter if present.
Drain Pans and Interior of Unit
Wash the foil faced insulation surfaces and wipe
the drain pans with a soft cloth and mild cleaning
solution. Check the drain fittings to ensure they are
draining freely.
Heat Recovery Core
The heat recovery core must be handled with care.
It is recommended that it be washed once a year
following the season of most intense use, in order to
ensure maximum efficiency of the partitions.
1 or 2
1
VL0002A
1
1
2
VL0001
600 cfm and 1200 cfm
700 cfm
WARNING
Disconnect power before maintaining unit.
1. Washable foam filter
2. MEF filter - optional
WARNING
Disconnect power before maintaining unit.