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5.5
Fan Assembly
5.5.1.1
Description
The air medic comes with two high efficiency backward
inclined fans. These fans modulate their speed based on the
input control signal which varies from 0-10VDC, based on the
controls selected in the Fan Control section.
All controls within the fans are internally sealed and do not
need any maintenance.
5.5.1.2
Replacement Instructions
To replace a fan, first open the lower access panel and then
remove the fan cover. Disconnect the quick connect to the
desired fan. Remove the screws holding the fan to the
bulkhead and then remove the fan through the opening.
To install the new fan, insert into the opening and align the fan
with the holes on the bulkhead. Ensure the fan in oriented in a
way that the fan quick connect will reach the unit quick
connect. Tighten all screws on the fan and then reconnect the
quick connect. Ensure they have a firm and properly sealed
connection, and that the locks have fully engaged.
5.6
Differential Pressure Switch (Optional Accessory)
5.6.1.1
Description
An optional accessory is the differential pressure switch. This
switch measures the pressure around the HEPA filter with the
use of 1/4” tubing
to let the operator know when the HEPA
needs to be replaced. When the pressure differential around
the HEPA rises above the recommended level the switch will
close and it will light the amber indicator light on the unit face.
5.6.1.2
Maintenance Interval
The switch is fully sealed and does not need any maintenance
itself.
Every year it is recommended to inspect pressure switch
tubing to ensure they are a not kinked or clogged.
5.6.1.3
Replacement instructions
To replace the Differential Pressure Switch, first remove the
lower access panel, and then disconnect the tubing attached
to switch. Unscrew the switch from the bulkhead, removing
the Prefilter and Activated Carbon Filter on that side my allow
for easier access. Once the device is loose, open the cap and
disconnect the wiring inside, then remove them from the
switch.
Open the remove the cap from the new switch, adjust the dial
to 2-inch WC, feed the wires into the switch and attach them
to terminals 2&3. Attach the cap and mount the switch to the
bulkhead, ensure the tube ports are pointed down. Reattach
the tubes, with the tube going below the HEPA on port 1, and
the tube going above the filter onto port 2.