Component Operation and Maintenance 51
6.5.3 Start-Up and Operation
Check to see that the unit is securely mounted on a level surface with the proper drain and water sup-
ply. 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 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. Compo-
nents damaged due to loose connections are NOT under warranty.
Check electrode plugs on the cylinder to ensure they are pressed firmly onto the electrode pins.
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. Ensure unit is calling for humidity.
PUSH THE AUTO ON/OFF/DRAIN SWITCH TO “ON.”
After a brief self-test, water will start to enter the cylinder through its bottom port and rise in the cyl-
inder 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
amber high water sensor light.
The amber light simply acts as a safety to shut off the fill valve and prevent over-filling. With the
amber 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 cyl-
inder, the amber light will go out and the fill solenoid will again open until the cylinder is again full.
This cycling of the amber light and fill valve will continue until the unit’s full output capacity is
reached after which the water level will automatically lower itself in the cylinder. (The increased con-
centration allows for lower electrode coverage while maintaining the same output.) When a stabilized
condition is reached the water will be boiling close to the cylinder seam level. The solid state circuitry
will maintain the proper concentration in the cylinder by introducing short drains only when neces-
sary.
If the cylinder is manually drained the above process will repeat itself.
Low Water Conductivity
Should normalization of the unit be required immediately after start-up, the installer may speed up
the process by artificially increasing water conductivity. During a fill cycle, the installer should dis-
solve half a teaspoon of table salt (no more) in a cup of water and add it to the cylinder by means of
the fill cup attached to the plumbing section.
Open the plumbing compartment and add salt solution through cylinder outlet. Excessive amounts of
salt will result in erratic operation of the unit; however, normalization of the unit will occur automat-
ically through the solid-state control sequence.
Capacity Adjustment
The Himod humidifier comes with an adjustable capacity PC board. This board has an adjustment pot
for 25 to 100%.
!
CAUTION
Loose connections will cause overheating of the cylinder plugs, possibly melting the plugs and/
or cylinder.
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