AirSep MN138-1 H - Manual (Page 22)

16
MN138-1 Rev H
02/14
5. Disconnect the wire connectors labeled AC Power and PowerSw from circuit
board. (If equipped with an O2 oxygen monitor, also disconnect wire connectors
labeled O2 LED and Sensor).
6. With adjusting compressor enclosure (alternating pulling out top and bottom),
gently remove the compressor enclosure from the center section of unit by sliding
it out through the front.
7. Locate cooling fan at the back of the compressor enclosure. Review of both the
cooling fan and its wire connection positions should be made prior to fan removal
to allow easier and proper installation of new fan.
8. Remove fan and foam strip from the fan recess area and disconnect wires at
proper locations.
Cabinet Fan Installation
To install the cabinet fan, follow the steps below:
It is very important to install the cabinet fan correctly. Reference
to arrow indicating airflow direction must be made. Improper
installation of cabinet fan may result in unit to overheat and
shutdown.
1. Locate arrow on fan indicating airflow direction. The arrow for airflow must be
pointing towards the compressor when properly installed.
2. Install wire connections onto new fan. Depending on the replacement fan version
being installed, wire connections on fan should be positioned either in the top left
or lower right positions when properly installed.
3. Replace foam strip around housing of new fan. Opening of foam should be
positioned at the upper right corner of fan when installed, and wires from fan
connections routed through same opening of foam at this location.
4. Position both foam strip and cabinet fan into fan recess area located at the back of
the compressor enclosure. When properly installed, both foam strip and fan must
be flush with the edge of fan recess area.
5. Return compressor compartment to the original position, being careful not to
pinch any tubing or wires between compressor enclosure and center section of
unit.
6. After removing tape from the top of each sieve bed, reconnect and tighten fittings.
(Small tubing from the bottom sieve beds and the unit’s power cord should be
located inside and underneath the tubing connected to sieve beds.
7. Reconnect and secure tubing to equalization valve using tie-wraps.
8. Reconnect wire connectors to main circuit board labeled AC Power and
PowerSw. (If equipped with an O2 oxygen monitor, also reconnect wire
connections labeled O2 LED and Sensor).
9. Reattach small tubing to the in-line adaptor leading to the sensor located on the
circuit board, secure with tie wrap.
10. Leak test tubing connections and assure fan is rotating properly.
4.7 Circuit Board
The solid-state printed circuit board controls the timing operation of the five solenoid valves, the
alarm system functions, and regulates the voltage to ensure efficient and optimal performance.