AirSep MN138-1 H - Manual (Page 20)

14
MN138-1 Rev H
02/14
a. Care must be taken not to pinch any wires or tubing between the
compressor enclosure and center section before final installation.
b. The wire harness for both the left feed valve and the equalization valve,
along with the wire harness for the right feed valve, must be routed
outside of the valve manifold assembly before connecting to valve coils.
c. The AC I/ 0 power switch wire harness and the pressure tubing to the
circuit board sensor must be routed to the outside of the manifold
assembly and along the back of the capacitor before installation.
7. When reinstalling fittings to top of the sieve beds, ensure wires and tubing on
both sides are located inside of these connections.
8. If equipped with an O2 oxygen monitor, be sure to reconnect wire connections
labeled O2 LED and Sensor to circuit board.
9. When reattaching tubing to exhaust muffler, be sure to secure with tie-wrap.
10. Install the compressor assembly by following the compressor assembly
installation procedure outlined under section 4.3.1
.
4.4.2 Solenoid Valve Coil Replacement
An ohmmeter can be a useful tool in determining the condition of a valve coil. When
using an ohmmeter, each valve coil should be between 713 – 837ohms.
To replace a solenoid valve coil, follow the steps below:
1. Set the unit’s I/ 0 switch to the “0” position and unplug the power cord.
2. Remove back panel.
3. Carefully remove valve retaining clip from coil to be replaced.
4. Disconnect both wire connectors from solenoid valve, lift coil off of valve stem.
5. Install new coil on valve stem, reinstall coil retaining clip, and reconnect both
wire connectors to coil .
6. V alve coil retainer clips must be installed correctly so that the open ends are
pointing downward on top of valve coil.
4.5 Sieve Beds
The VisionAire unit utilizes two sieve beds each containing molecular sieve. The unique
property of molecular sieve enables it to physically attract nitrogen when air passes through this
material, thus producing high concentrated oxygen.
While one sieve bed produces high-concentration oxygen, the other is purged of the nitrogen it
adsorbed (collected) while it concentrates oxygen. Each adsorber (sieve bed) produces oxygen
and delivers it to the mixing tank.
4.5.1 Sieve Bed Replacement
Temporarily seal sieve bed openings with tape to prevent the sieve
material from being exposed to the moisture in room air. Prolonged
exposure to room air results in contamination and permanent damage to
the sieve material.
VisionAire 2 uses different sieve beds (BE187-4) thanVisionAire or
VisionAire 3 (BE187-2). The beds look the same but use different
molecular sieve (SI015-1 for V2).