Field Controls Humidifier AN 134 User Manual

HUMIDIFIERS  
AN-134 Water Level Probe Replacement Instructions  
SUPPLEMENTTOTHEELECTRONICSTEAM  
POWER HUMIDIFIERS MODEL #S2000 AND S2020  
REPAIRS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN  
To replace the water level probe in the “S” series steam  
Push the water level probe up to and through the hole in  
the circuit board. Re-install the last 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 re-adjust 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.  
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.  
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.  
Now use a phillips screwdriver and loosen the four screws  
securing the front cover and remove the front cover. You  
can now see the entire Water Level Probe.  
Review the entire project to be sure that nothing has been  
overlooked.  
Use a 5/16” nut driver to loosen the hex nut which secures  
the water level probe to the printed circuit board. Then pull  
the water level probe out of the plastic insulator just far  
enough to remove the second hex nut. Now you can gently  
pull the water level probe out and through the plastic  
insulator. Be careful not to damage the plastic insulator!  
Place a small dab of grease or Vaseline on the water  
level probe, to ease the water level probe out. Do the  
same on the new water level probe when re-inserting it.  
If the plastic insulator gets damaged, replace it. Otherwise,  
save the new plastic insulator for future use.  
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.  
If the plastic insulator is damaged or, you want to replace it  
anyway, you must loosen and remove the ground screw  
at the top of the printed circuit board. This allows some  
play between the circuit board and the plastic insulator.  
Use pliers and pull the old plastic insulator out. Place a  
bead of clear RTV silicon around the square portion of the  
plastic insulator (between the sealing flanges). Position the  
plastic insulator at the square hole in the humidifier and  
using pliers and a side to side motion, gently pull the  
plastic insulator through the hole until the outside flange  
pops completely through.  
PLASTIC INSULATOR  
Insert the new water level probe into the plastic insulator  
using a dab of grease to ease it in. Wrap the small cable tie  
around the plastic insulator and pull tight. Cut off the  
excess length. Screw one hex nut onto the water level  
probe until about 1/4” of the threads are exposed. Re-install  
the ground screw removed earlier and secure the circuit  
board.  
WATER LEVEL PROBE  
P/N 090376A0134 REV. C 10/2011 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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