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NH Electric Steam Humidifier
Periodic Maintenance Checklist & Quick Reference (p. 2 of 2)
Unit Serial #: ________ # of humidifiers: _____ Tag:_____________
Unit type:
Voltage: _____V/___ph Steam output: ____lbs./hr
Customer/Job:_______________ Address: ___________________________________
Maintenance by: _____________ Date of maintenance:___/___/___
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HOW TO INSTALL THE REPLACEMENT CYLINDER
1.Reverse procedure should be followed to install new cylinder. Main disconnect is to be left open
until cylinder is completely installed and reconnected.
2.Ensure that the re-usable tie wrap and mounting brackets within the unit secure the cylinder
properly.
3.The cylinder plug wires are colour-coded in accordance with coloured dots beside the electrode pins
on top of the cylinder.
4.This colour coding must be adhered to when replacing cylinder plugs on pins.
5.With cylinders having six primary voltage cylinder plugs, it should be noted that there are two of
each colour.
6.Care must be taken so that cylinder leads of the same color are always directly opposite each other
as indicated by the dot formation on the top of the cylinder.
7.The white cylinder plug on all units is for the high water sensor electrode, which always goes on the
single pin surrounded by a plastic shoulder.
8.Ensure that cylinder plugs fit snugly on the pins.
9.If cylinder plugs become loose, it is best to obtain a new replacement plug. Consult factory.
EXTENDED SHUTDOWN:
1.Before disconnecting power to the humidifier for a period of extended shutdown, ALWAYS DRAIN
the cylinder first.
2.Do NOT leave the switch in the DRAIN position indefinitely as the drain coil could burn out. Leave
the switch in the OFF position and “open” the main external fused disconnect to stop power to the
humidifier.
3.Close the shut off valve in the water supply line feeding the humidifier. Lock the cabinet door(s) to
prevent unauthorized tampering. All doors are factory supplied with keyed locks.
DO NOT LEAVE KEY IN LOCK. ACCESS SHOULD BE LIMITED TO AUTHORIZED PERSONNEL
ONLY.
4.NHMC 3 day drain: As long as the NHMC is powered, it will automatically drain the cylinder when
there has not been a call for humidity for an extended period of time.
5.The cylinder will remain empty until there is a call for humidity at which time the fill valve will open
and refill the cylinder.
This feature will reduce the possibility of corrosion of the electrodes and the possible accumulation of
algae and bacteria growing in the cylinder.
Remarks:
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