Nortec Industries MES-U - Manual (Page 4)

WATER SUPPLY AND PLUMBING
1. The orifice in the fill valve is sized for an extended
water pressure range of 30 to 85 psi.
2. For water pressure between 15 and 30 psi, notify
the factory and the next larger size fill valve will be
supplied.
3. For cases below 15 psi, notify the factory and a fill
valve with an oversized orifice will be supplied.
4. For cases above 85 psi, install a pressure
reducing valve in the water feed line to the unit.
5. With extremely dirty or muddy water sources, e.g.,
some well sources, ensure proper filtration by
adding an external filter to the water line entering
the unit. (Consult factory for accessories such as
filters.)
6. DO NOT use completely demineralized water with
this unit as it is the minerals that allow the
electrode principle to work.
7. DO NOT use a hot water source as it will cause
deposits that will eventually block the fill valve
orifice.
WATER CONNECTION
1. A copper compression olive type coupling for 1/4"
O.D. soft copper tubing is provided with unit and
requires no soldering for the water connection to
the unit. See Figure #2.
2. An isolating valve should ALWAYS be placed in
the feed water line allowing service of the fill valve.
3. Each unit is fitted with a fill solenoid valve located
on the base drain pan. Flow orifices are designed
for water pressure from 30 to 85 psi and are
protected by the built-in strainer.
4. For inlet water pressure outside this range, the
factory should be contacted. (See Water Supply
and Plumbing section of this manual.)
START-UP AND OPERATION
Check to see that the unit is securely mounted on
a level surface with the proper drain and water supply.
Check for correct voltage with appropriately sized
service. Check that the steam distributor, steam
supply hose, and condensate line are correctly
installed and routed back to the unit. Ensure that the
external control humidistat is located in an area to
properly sense the relative humidity to be maintained
by the humidifier, and that the interconnecting low
voltage wires between the humidistat and the unit’s
control terminal strip are in accordance with the wiring
diagram.
Check all electrical connections for wires which
may have become loose in shipping. Components
damaged due to loose connections are NOT under
warranty.
Check electrode plugs to ensure they are pressed
firmly onto the electrode pins. Important: Loose
connections will cause overheating of the cylinder
plugs, possibly melting the plugs and/or cylinder.
Open the isolating valve in the feed water line to
the unit.
Make sure the humidistat is set high enough to call
for humidification.
Turn on the main disconnect in the primary service
feeding the unit and check that unit has power at the
primary terminal block.
PUSH THE AUTO ON/OFF/DRAIN SWITCH TO
“ON”.
Water will start to enter the cylinder through its
bottom port and rise in the cylinder to a point
determined by the solid-state control circuitry.
It is not unusual upon initial start-up for the
water to fill the cylinder and cycle on the red high
water sensor light.
The red light simply acts as a safety to shut off the
fill valve and prevent over-filling. With the red light on,
the water in the cylinder will continue to heat and, after
a few minutes, start to boil. After the boiling action of
the water has lowered the water level below the
sensor at the top of the cylinder, the red light will go
- 2 -
Figure #2
Bottom View of MES-U Unit
3/8" Cold Water
Olive Connection
7/8" Drain
Connection
Use 7/8" I.D. Hose From Factory