ETI NETCOM ADH Assembly Replacement Procedure page 3

HUMIDITY SENSOR ASSEMBLY REMOVAL AND
REPLACEMENT
To replace the Humidity Sensor Assembly (23368) in either an
ADH NETCOM Automatic Air Dehydrator with AC power or an
ADH NETCOM with Redundant DC power, perform the steps
below. Refer to Figure 1a or 1b, respectively, for AC and DC unit
illustrations.
1. Shut off AC unit power by placing the power switch in the
OFF (O) position. Unplug the power cord. Shut off DC unit
power by shutting off the external power supply. If possible,
move the unit to a work table.
2. Remove both top machine panels for easier access to the
humidity sensor assembly. Retain mounting hardware.
3. Using a tubing wrench or vacuum tubing pliers, carefully
disconnect from the "Y" hose assembly the length of hose
running between the "Y" assembly and the evaporator tray.
Refer back to Figure 1a for AC units and Figure 1b for DC
units.
4. Using a tubing wrench or vacuum tubing pliers, carefully
remove the two air hoses connected to the existing
humidity sensor. Refer to Figure 2.
Power Filter Module and
Switch with electrical leads
removed (reference)
Disconnect evaporator
tray air hose from "Y"
assembly here. (step 3)
Figure 1a. THE ADH NETCOM AUTOMATIC AIR DEHYDRATOR
HUMIDITY SENSOR ASSEMBLY IN AN AC UNIT.
MODEL ADH
Hose to Evaporator Tray
Humidity Sensor Assembly
HUMIDITY SENSOR ASSEMBLY REPLACEMENT PROCEDURE | PART NO.
3
HUMIDITY SENSOR ASSEMBLY
REPLACEMENT PROCEDURE
Disconnect evaporator
tray air hose from "Y"
assembly here. (step 3)
Figure 1b. THE ADH NETCOM AUTOMATIC AIRDEHYDRATOR
HUMIDITY SENSOR ASSEMBLY IN A DC UNIT.
Air In hose (90° fitting)
Air Out hose
(Straight fitting)
Figure 2. THE TWO HUMIDITY SENSOR AIR HOSES.
(some components removed for greater clarity)
5. Using the diagonal cutters, cut the two tie wraps securing
the humidity sensor assembly to its tie wrap mounts then
move the sensor out of the way to gain access to the
electrical connector.
6. Using a small tool, press in on either orange release tab
on the humidity sensor electrical connector on the PC
board then carefully remove the lead from that terminal.
Repeat for the other lead. Once both air hoses and both
electrical leads have been disconnected and the two tie
wraps cut, remove the existing humidity sensor from the
dehydrator.
Humidity sensor
electrical connector
(on PC board)
24104 REV B.0