Nortec NH Series - Manual (Page 81)

10-50
Page 74
2008-08-28
E. PERIODIC MAINTENANCE CHECKLIST AND QUICK REFERENCE (PAGE 1 OF 2)
Unit Serial #: _________________No. of humidifiers: _______ Tag: _______________
Unit type: ___________________Voltage: _____V/___ph
Steam output: ____lbs/hr
Customer/Job: ______________ Address: ______________________________________
Inspected by: ________________Date of inspection: ____/____/____
WHEN TO REPLACE THE CYLINDER:
NHTC/NHPC light indication and LCD display:
1.
Yellow and Green light with W19: Cylinder Spent indicates the cylinder must be
replaced in the next 72 hours.
2. Red and Yellow light with E19: Cylinder Spent indicates the cylinder is at the end of
its life and must be replaced.
CYLINDER REPLACEMENT PROCEDURE:
1.
Turn off water supply to unit.
2. Activate drain to completely empty water content (less than 10 minutes)
3. When drained, stop drain and turn off unit.
4. Also open the main electrical disconnect switch and open plumbing.
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 slotted screwdriver, loosen the steam line clamp(s) and pull steam line off
the cylinder vertically.
7. Using a small slotted screwdriver, depress tab on the re-usable cable tie, if present,
around the middle of the cylinder. This will loosen the cable tie to come apart for re-
use later on.
8. The cylinder is now ready to be removed from the unit.
CAUTION: Cylinder and any remaining 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 (24 VAC) 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.