ETI NETCOM ADH Use and care manual

HUMIDITY SENSOR ASSEMBLY REPLACEMENT PROCEDURE | PART NO. 24104 REV B.0
MODEL ADH
ADH NETCOM AUTOMATIC AIR DEHYDRATOR
HUMIDITY SENSOR ASSEMBLY REPLACEMENT PROCEDURE
Replacement Kit Part Number 24092
Document Part Number 24104

HUMIDITY SENSOR ASSEMBLY
REPLACEMENT PROCEDURE
MODEL ADH
Lethal Voltages Present
Lethal voltages are present inside the ADH
NETCOM. Service should be performed by
qualified personnel only. There are no user
serviceable components inside the chassis.
Abnormal Odor or Smoke
In the event of smoke or a burning or abnormal
odor, immediately interrupt power to the ADH
NETCOM with the POWER switch at the rear of the
unit, unplug the unit, or turn off the circuit breaker
controlling the outlet. Note that only the AC model
of the ADH NETCOM has an ON / OFF switch.
Pneumatics
Each of the air pumps inside the ADH NETCOM
automatic air dehydrator is capable of generating
as much as 24 psig (1,655mbar). Other attached
dry air sources may be capable of generating even
higher pressures. Proper safety practice requires
treating all pneumatic components with care.
Always vent the system to atmospheric pressure
before servicing pneumatic components.
Rack Mounting
Before and after rack mounting the ADH
NETCOM, ensure that the rack is stable. Mounting
of the ADH NETCOM into a rack should be such
that a hazardous condition is not created due to
uneven mechanical loading. Verify that adequate
air flow and power source capacity is available to
the unit. Ensure that the ADH NETCOM maximum
operating temperature of 130°F (55°C) will not be
compromised by other components in the rack.
Ensure reliable earthing of the ADH NETCOM.
ADH NETCOM HUMIDITY SENSOR ASSEMBLY
REPLACEMENT PROCEDURE
This procedure addresses the removal and replacement of
the Humidity Sensor Assembly in either an ADH NETCOM
Automatic Air Dehydrator with AC power or with Redundant
DC power. It is recommended to read the entire procedure
prior to beginning work.
INVENTORY LIST
Identify the following items in this kit prior to beginning
work.
TOOLS REQUIRED
The following tools are needed to perform this procedure:
• Small flat blade screwdriver
• Tubing wrench or vacuum tube pliers
• Diagonal Cutters
NOTE :
On AC units, it might be useful to move the power filter
module and switch assembly out of the way for better access
to the humidity sensor during this procedure. Refer to Figure
1a. To do so, from the inside of the machine, after first noting
their placement, carefully disconnect the three electrical
leads from the filter module. Do not separate the leads from
the spade lugs. Then, from the back of the machine, unscrew
the two screws securing the power filter module to the
machine chassis then gently push the power filter module
toward the back of the dehydrator. It is not necessary to fully
remove the power filter module.
2
PART NO. DESCRIPTIONQTY.
23368
24104
Humidity Sensor Assembly
Instruction Manual (this document)
1
1
HUMIDITY SENSOR ASSEMBLY REPLACEMENT PROCEDURE | PART NO. 24104 REV B.0

3
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.
Remove both top machine panels for easier access to the
humidity sensor assembly. Retain mounting hardware.
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.
Using a tubing wrench or vacuum tubing pliers, carefully
remove the two air hoses connected to the existing
humidity sensor. Refer to Figure 2.
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.
HUMIDITY SENSOR ASSEMBLY REMOVAL AND
REPLACEMENT
1.
2.
3.
4.
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.
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.
5.
6.
HUMIDITY SENSOR ASSEMBLY REPLACEMENT PROCEDURE | PART NO. 24104 REV B.0
HUMIDITY SENSOR ASSEMBLY
REPLACEMENT PROCEDURE
MODEL ADH
Power Filter Module and
Switch with electrical leads
removed (reference)
Disconnect evaporator
tray air hose from “Y”
assembly here. (step 3)
Humidity Sensor Assembly
Hose to Evaporator Tray
Figure 1a. THE ADH NETCOM AUTOMATIC AIR DEHYDRATOR
HUMIDITY SENSOR ASSEMBLY IN AN AC UNIT.
Figure 1b. THE ADH NETCOM AUTOMATIC AIRDEHYDRATOR
HUMIDITY SENSOR ASSEMBLY IN A DC UNIT.
Figure 2. THE TWO HUMIDITY SENSOR AIR HOSES.
(some components removed for greater clarity)
Disconnect evaporator
tray air hose from “Y”
assembly here. (step 3)
Air In hose (90° fitting)
Air Out hose
(Straight fitting)
Humidity sensor
electrical connector
(on PC board)

For technical help, questions or comments concerning this
product or any ETI product contact Customer Service 8:00 a.m. -
5:00 p.m. Eastern Time.
[email protected]
networketi.com
ETI
1850 North Sheridan Street
South Bend, IN 46628
Email:
Web:
Mail:
CONTACTING CUSTOMER SERVICE
ETI’s two year limited warranty covering defects in workmanship
and materials applies. Contact Customer Service for complete
warranty information.
LIMITED WARRANTY
ETI makes no representations or warranties, either expressed or
implied, with respect to the contents of this publication or the
products that it describes, and specifically disclaims any implied
warranties of merchantability or fitness for any particular
purpose. ETI reserves the right to revise this publication, and to
make changes and improvements to the products described in
this publication, without the obligation of ETI to notify any person
or organization of such revisions, changes or improvements.
DISCLAIMER
4
Before putting the new humidity sensor on the tie wrap
mounts, connect the two leads from the new humidity
sensor. Reversing the process in step 6, push in on either
orange release tab then insert either humidity sensor
lead into that terminal. It does not matter which lead
goes to which terminal. Release the tab to secure the
lead. Repeat this process for the other lead. Tug gently
on each lead to make sure it is firmly connected.
Place the new humidity sensor onto the two tie wrap
mounts from which the original assembly was removed.
Before securing the new humidity sensor in place, rotate
the sensor on the two mounts so that the two air hoses
reach their respective 90° and straight fittings. The
longer hose is the Air Out hose and connects to the
lower or straight fitting.
The shorter hose is the Air In hose and connects to the
upper or 90° fitting. There is no right or wrong angle for
the humidity sensor itself in terms of function. All that
matters here is that both air hoses reach and connect
securely to the two sensor fittings.
Once the angle of the humidity sensor is determined
based on the position of the fittings to the hoses, secure
the new humidity sensor in place by feeding the two tie
wraps from the kit through the slot in each mount,
knurled side up, wrap the tie wraps together, then cut off
the excess from each tie wrap.
Reconnect the “Y” section of the tubing assembly which
runs to the evaporator tray and which was disconnected
in step 3.
As described in the Note on page 3, if any components
were moved or removed for better access to the
humidity sensor, replace them in their original location
and position at this time. Restore all connections. When
connecting the three electrical leads to the power filter
module on AC units, make sure to connect them to the
same terminals from which they were removed.
Reinstall the top panels using the hardware removed in
Step 2.
Restore machine power.
7.
8.
9.
10.
11.
12.
13.
HUMIDITY SENSOR ASSEMBLY REPLACEMENT PROCEDURE | PART NO. 24104 REV B.0
HUMIDITY SENSOR ASSEMBLY
REPLACEMENT PROCEDURE
MODEL ADH