Field Controls Humidifier AN 135 User Manual

HUMIDIFIERS  
AN-135 Thermistor Probe Replacement Instructions  
SUPPLEMENT TO THE ELECTRONIC STEAM POWER HUMIDIFIERS  
MODEL # S2000 AND S2020  
REPAIRS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN  
Position the printed circuit board into place and secure with  
To replace the Thermistor Probe in the “S” series steam  
the two small phillips screws at each bottom corner.  
Make sure that no wires are pinched between the  
transformer and the front plate. Adjust the wires as  
necessary.  
NOTE: Loose spade connectors can overheat and damage  
the wires. Use pliers to re-tighten the spade connectors and  
do not allow line and load wires to cross over each other.  
Doing so will void your warranty.  
humidifier, you must unplug and shut down your steam  
humidifier and allow it to cool. The water tank must be  
drained, the water supply, drain lines and electrical wiring  
must be disconnected and the unit removed from the duct.  
Pull straight up on the Green terminal block to disconnect it  
from the unit.  
Place the unit on a flat working surface.  
Using a phillips screwdriver, remove the two screws that  
hold the baffle plate to the tank. Lift the baffle slightly back  
to clear the water level probe and then straight up and out  
of the tank.  
Unplug the automatic drain valve assembly from the side  
of the front cover. Snip the plastic wire tie that secures the  
drain valve wires to the main power cord. Now use an  
adjustable wrench at the brass “T” adapter to unscrew the  
entire drain valve assembly. DO NOT use the drain valve  
itself as leverage when removing or re-installing the drain  
valve assembly. Doing so will damage the drain valve and  
void the warranty.  
Now use a phillips screwdriver and loosen the four screws  
securing the front cover and remove the front cover.  
Use a 5/16” nut driver to loosen and remove the hex nut  
which secures the water level probe to the printed circuit  
board. Remove the ground screw at the upper right hand  
corner of the printed circuit board. Remove the two small  
phillips screws at the bottom corners of the printed circuit  
board. The printed circuit board can now be laid flat and out  
of the way. Be careful not to damage it! Locate the wires  
from the Thermistor Probe and trace them to where they  
connect to the printed circuit board. Pull the connector off of  
the board.  
Use two 7/16” combination wrenches, one as a backup on  
the thermistor probe side, and the other wrench on the hex  
nut. Loosen the hex nut on the Thermistor Probe assembly.  
It will be a little tight due to the Loctite on the threads from  
the factory. Loosen the nut all the way. Now cut both wire  
leads in order to remove the nut and pull the thermistor  
probe out of the tank. Discard the old Thermistor Probe and  
the cut wire/connector.  
Tighten the ground screw at the upper right hand corner.  
Position the water level probe back into the hole on the printed  
circuit board. Re-install the hex nut and tighten down firmly  
while holding the water level probe leg straight down towards  
the bottom of the tank. Loosen the hex nut and readjust if  
necessary.  
Now you can re-install the front cover. Make sure to line up  
with the LED’s on the printed circuit board. Do not crush them  
when pushing the front cover back on. You may have to  
loosen the front cover screws a bit more. Press the front  
cover back on all the way and tighten the four front cover  
screws. Re-install the baffle plate and secure with the two  
phillips screws.  
Apply Teflon tape to the threads of the “T” adapter on the  
automatic drain valve. Screw the entire drain valve assembly  
back onto the drain fitting and tighten with an adjustable  
wrench. DO NOT use the solenoid valve itself as leverage  
to turn and tighten the assembly. Doing so will damage the  
valve. Tighten and position the drain assembly to the original  
position. Plug the drain valve molded connector back in on  
the side of the front cover until it snaps into place. Secure  
the drain valve wires with the short cable tie.  
Review the entire project to be sure that nothing has been  
overlooked.  
Now insert the unit back into the duct and secure it.  
Re-connect the water, electrical and drain connections. Open  
the water source valve and plug the steam humidifier into it’s  
electrical outlet. Make sure the humidistat is calling for  
humidity. Observe the operation of the unit and make sure  
there are no water leaks.  
“O” RING  
Now remove the new Thermistor Probe and the other  
accessories from the bag. Put the ”O” ring onto the threads  
of the thermistor probe and all the way up to the base of the  
Thermistor Probe. Feed the thermistor probe’s wire leads  
through the hole in the tank and out the front. Position the  
thermistor probe into the hole. Now feed one wire at a time  
through the hex nut and thread the hex nut onto the  
Thermistor Probe. Tighten the hex nut firmly.  
HEX NUT  
THERMISTOR PROBE  
Do not over tighten and damage the “O” ring.  
Now insert each wire into the molded plastic connector until  
it snaps in to place. Plug the connector back on to the  
printed circuit board J2 pins.  
CONNECTOR  
P/N 090376A0135 REV. D 11/2011 Copyright © 2011, Field Controls Inc., All Rights Reserved  
Field Controls Inc. 2630 Airport Road Kinston, NC 28504 PH: 252.522.3031 FAX: 252.522.0214  
 

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