Installation and Maintenance
EHU-600 Series Humidifiers
19
Start-Up
Procedure
Figure 19-1: Electrical Component
Identification
(Model EHU-602 shown)
Figure 19-2: Humidistat Element
The following steps should be performed on all newly installed EHU
Humidifier units to ensure that the humidifier functions correctly.
1.
Turn power supply at disconnect off.
2.
Open the two doors.
3.
Examine the wiring and the components in the electrical
compartment.
4.
Check for any loose wires or quick-connect terminals that may have
been pulled loose.
5.
Using a screwdriver, Tighten All Screw Terminals on the power
supply terminal block, ground lug, and contactor (See Figure
19-1) to ensure that no connections have become loose during
shipping.
Make sure steam generator tank connections are installed and
tightened according to the installation instructions (see pg. 6
installation step 5). Remember, a loose joint is a HOT joint and
could be a fire hazard!
6.
Locate the "Low Voltage Terminal Block" (See Figure 19-1).
7.
Disconnect the control wiring to terminals 3 and 23 (High Limit
Humidistat) and terminals 2 and 24 (Air Proving Switch), then
jumper them out with the tabs provided, or a short piece of wire.
8.
Turn on the water supply – Check for leaks.
9.
Turn power supply on. The following should now happen:
a.
The "Power" and "Tank Off" lights will now be momentarily
illuminated.
b.
The "Tank Off" light will go out and the "Fill Light" will go on.
Unit will begin to fill.
c.
If the unit does not begin filling, force a 100% humidity demand
by removing the humidistat element (See Figure 19-2). The
unit will then start to fill, and the "Tank Off" light will go out. If
not, the humidistat may be wired incorrectly or may not be the
Armstrong humidistat. See troubleshooting section of this
manual for more information on humidistat wiring.
NOTE: If the humidistat is not the standard Armstrong stat,
the method of forcing a demand signal will be different.
Generally, increasing the humidity set point on the humidistat
will generate a demand signal. Check with the control system
contractor for information.
Contactors
Current
Transformers
Low
Voltage
Terminal
Block
Power
Supply
Terminal
Block
