DeVilbiss iFill 535D - Power Supply PC Board; Rotary Valve; Sieve Beds; Three-Way Valve

LT-1929
17
COMPONENT TESTING, REPAIR, AND REPLACEMENT
CAUTION–Do not apply any force or ex the PC Board when
connecting or disconnecting electronic or pneumatic
components. Damage to the electronic assembly is possible.
DC Power Supply PC Board
The DC power supply PC board supplies DC voltage to operate
the main PC board. It is located on the Plexiglas mounting
platform above the compressor.
To replace the power supply board (Figure 12):
1. Ensure the iFill station is unplugged from the wall outlet.
2. Remove the left and right covers from the iFill station.
3. Disconnect the two electrical connectors from the board.
4. Carefully remove board from the plastic stand-offs.
5. Install replacement board by pushing it down onto stand-offs
until it locks into place.
6. Reconnect the electrical connectors.
7. Replace covers.
NOTE–Be sure to reattach indicator panel
ribbon connector and hour meter electrical connector (refer
to Cover Removal and Replacement in this manual).
CAUTION–Do not apply any force or ex the PC Board when
connecting or disconnecting electronic or pneumatic
components. Damage to the electronic assembly is possible.
ROTARY VALVE
The rotary valve is located at the bottom of the unit between the
sieve beds. It alternately distributes compressed air to the sieve
beds in a timed sequence. While one bed is being pressurized,
the other bed is being exhausted through the valve. Exhaust
gases go through the valve exhaust port and exit through the
exhaust mufer.
To replace the rotary valve (Figures 15 & 17):
1. Ensure the iFill station is unplugged from the wall outlet.
2. Remove the left and right covers from the iFill station.
3. Remove the pressure intensier rst. Refer to Intensier
Removal instructions.
NOTE–The four-way valve does not
have to be removed from the intensier when replacing the
rotary valve; however, the electrical connector and tubing
still need to be disconnected from the four-way valve.
4. Cut cable tie holding rotary valve wire harness and
disconnect harness from the valve.
5. Loosen speedy clamps and remove tubing from both sides
of valve.
6. Loosen ladder clamp and remove tubing from the
compressor exhaust tting that is located closest to the PR
valve on compressor.
7. Pull rotary valve forward slightly and then loosen ladder
clamps and remove tubing from the two ttings on the
backside of valve.
8. Reattach tubing to the same two ttings on the new rotary
valve.
9. Reattach tubing to the compressor exhaust tting.
10. Reattach tubing to ttings on both sides of valve.
11. Reconnect valve wire harness and secure with cable tie.
12. Reinstall the pressure intensier.
13. Replace covers.
NOTE–Be sure to reattach indicator panel
ribbon connector and hour meter electrical connector (refer
to Cover Removal and Replacement in this manual).
SIEVE BEDS
The sieve beds are located in the front of the unit behind the
pressure intensier. They are alternately pressurized by the
rotary valve and remove the nitrogen from the compressed air
passing through them. The resulting high concentration of
oxygen is supplied to the pressure intensier.
NOTE– Sieve beds should be ordered and changed in pairs.
To replace the sieve beds (Figure 11):
1. Ensure the iFill station is unplugged from the wall outlet.
2. Remove the left and right covers from the iFill station.
3. Remove the pressure intensier rst. Refer to Intensier
Removal instructions.
NOTE–The four-way valve does not
have to be removed from the intensier when replacing the
sieve beds; however, the electrical connector and tubing still
need to be disconnected from the four-way valve.
4. Disconnect the tubing from the top and bottom of each sieve
bed.
5. Cut the plastic cable ties holding the sieve beds in place
and remove the beds.
6. Install new beds and secure with new plastic cable ties.
7. Reconnect the tubing to the beds.
8. Reinstall the pressure intensier.
9. Replace covers.
NOTE–Be sure to reattach indicator panel
ribbon connector and hour meter electrical connector (refer
to Cover Removal and Replacement in this manual).
CAUTION-Do not use regenerated sieve material.
THREE-WAY VALVE
The three-way valve is mounted on the vertical piece of metal
superstructure in the center of the unit next to the main PC
board. It is responsible for directing oxygen from the
accumulator tank to the inlet of the pressure intensier as well
as to the oxygen sensing device (OSD). At unit start-up, the
valve prevents oxygen from entering the intensier. After
approximately four minutes when the oxygen has reached the
proper purity level, the three-way valve will begin to direct the
oxygen to the inlet of the pressure intensier.
To replace the three-way valve (Figure 12):
1. Ensure the iFill station is unplugged from the wall outlet.
2. Remove the left and right covers from the iFill station.
3. Disconnect the three-way valve electrical connector from the
PC board.
4. Disconnect the three pieces of tubing from the valve.
5. Use a Torx screwdriver with a size T-10 bit to remove the
two retaining screws that secure the three-way valve to the
metal superstructure and remove valve.
6. Install the replacement valve using the retaining screws.
7. Reconnect the three pieces of tubing and electrical
connector.
8. Replace covers.
NOTE–Be sure to reattach indicator panel
ribbon connector and hour meter electrical connector (refer
to Cover Removal and Replacement in this manual).