Invacare 3LX, Service Manual

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16
TROUBLESHOOTING GUIDE
SYMPTOM: PROBABLE CAUSE: SOLUTION:
HIGH PRESSURE, Continued
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TROUBLESHOOTING GUIDE
2.
NOTE: REFER TO THE REPAIR/REPLACEMENT GUIDE IN THIS MANUAL FOR PROPER
REPLACEMENT OR ADJUSTMENT PROCEDURES
2b.Replace 4-way Valve (PROCE-
DURE 16).
b. Bad Coil.
3. Replace Sieve Beds (PROCE-
DURE 4).
3. Sieve Beds.
Contaminated.
1. Inlet Filter
Dirty or Plugged.
2. Compressor.
a. Leaks at fittings or tubing.
b. Leaking or defective relief
valve.
c. Insufficient voltage at outlet.
d. Worn Cup Seals or Gaskets.
1. Replace Inlet Filter (PROCE-
DURE 2).
2a.Replace or repair.
2b.Repair leak or replace.
2c.DO NOT use extension cords.
Use another outlet.
2d.Rebuild Top End of Compressor
(PROCEDURE 2).
3. Heat Exchanger
a. Leak at tubing or body cham-
ber.
b. Inspect tubing and heat
exchanger.
3a.Replace or retighten.
3b.Replace or retighten tubing. Re-
place Heat Exchanger (PROCE-
DURE 8).
LOW PRESSURE:
Internal Status Indicators:
RED: On GREEN: On
(
LX Control Board)
RED: One (1) Flash
GREEN : One (1) Flash
(Integrated Sensor Board)
(LX SMT Board)
Unit plugged in, power switch
on, continuous audible alarm. Com-
pressor shut down (Failure to cycle
due to low pressure).
4. Replace (PROCEDURE 6). 4. Regulator cracked or leaking.
5. P.E. Valve leaking. 5. Replace P.E. valve. Check volt
age at P.E. valve connector on 24
volt D.C. scale. The P.E.
valve activates or energizes
approximately 1 second prior to
the activation of the 4-way
Valve with approximately 24
volts. If voltage is in excess of 24
volts consistently, replace the
P.C. Board. If the P.C. Board
voltage acts normally, replace the
P.E.valve (PROCEDURE 3).
NOTE: Check for leaks starting at
the compressor output through
all the pneumatic connections.
Major leaks will cause system
pressures to remain below
adequate shift (exhaust) pres-
sures and will cause compressor
shut down.