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NH Electric Steam Humidifier
Periodic Maintenance Checklist & Quick Reference (p. 1 of 2)
Unit Serial #: ________ # of humidifiers: _____ Tag:_____________
Unit type:
Voltage: _____V/___ph Steam output: ____lbs./hr
Customer/Job:_______________ Address: ___________________________________
Maintenance by: _____________ Date of maintenance:___/___/___
______________________________________________________________________________
WHEN TO REPLACE THE CYLINDER:
NHMC light indication and LCD display:
1.Cylinder spent error 4 with Yellow and Green lights on
2.Cyl. Lifespan error 9 with Yellow on and Green off
NHP light indication:
1.Yellow flashing and Green on (unit still working, might be initial start-up fill)
2.Yellow flashing and Green off (unit shut down)
NHB light indication:
1.NHB Yellow on
CYLINDER REPLACEMENT PROCEDURE:
1.Turn off water supply to unit.
2.Activate drain switch to completely empty water content (less than 10 min.)
3.When drained, put switch back to the off position.
4.Also open the main electrical disconnect switch and open plumbing door using the key.
5.Remove the cylinder plugs by pulling vertically. The plugs are press-fitted over the electrode pins
protruding from the top of the cylinder.
6.Using a slot screwdriver, loosen the steam hose clamp(s) and pull steam hose off the cylinder
vertically.
7.Using a small slotted screwdriver, depress tab on the re-usable tie wrap, if present, around the
middle of the cylinder. This will loosen the tie wrap to come apart for re-use later on.
8.The cylinder is now ready to be lifted out of the unit.
CAUTION: Cylinder and any un-drained water might still be HOT.
9.Always clean the drain valve before installing a new cylinder. (see further below)
10.Remove the used cylinder and replace by a new one. Do not re-use cylinder.
MANDATORY CLEANING OF THE DRAIN VALVE
1.Note that ring terminal for drain valve green ground wire is sandwiched between drain valve body
and drain pan.
2.Remove two screws securing drain valve body to drain pan. Disconnect the two slip-on terminals
from the two tabs on the (24VAC) drain valve coil.
3.Remove hose clip and hose connection from drain valve body.
4.Drain valve assembly is now free to be taken to a sink for disassembly and cleaning.
Important: Tapered end of spring must be installed toward the solenoid.
5.Clean out the end of the hose, and then reconnect it to the drain valve body with the clamp.
6.Fit mounting screws through drain valve body, one through ring terminal on green ground wire.
WARNING: To prevent the possibility of electrical shock the green ground wire must be reinstalled
before power is restored. Push the two slip-on terminals back onto the two tabs on the coil. The
terminals, although not identical, are reversible.ox. 10 seconds).