Specifications

15
OPERATION
When the circuit board verifies all four basic controls have
been satisfied (control humidistat, high limit humidistat,
air flow, door interlock), it will send a signal to open a fill
solenoid valve, allowing water to flow across an air gap
into a standpipe. The standpipe provides a column of water
to be fed into the cylinder using gravity. The air gap pre-
vents the cylinder from pressurizing. The steam cylinder
normally operates at a pressure of approximately 1/2 PSI.
STEAM
DISTRIBUTOR
PIPE
STEAM
HOSE
FROM POWER
CONTACTOR
CYLINDER
VERTICAL
ELECTRODES
DRAIN
SOLENOID
VALVE
TO DRAIN
STEAM
WATER
AIR GAP
FILL
SOLENOID VALVE
NON CONTACT
HIGH WATER
SENSOR
Figure O
STAND
PIPE
OVERFLOW
TUBE
CONTROL CONNECTIONS
FOR SAFETY: MAKE SURE TO TURN OFF POWER AT THE
EXTERNAL DISCONNECT BEFORE MAKING ANY INTERNAL
CHANGES TO THE HUMIDIFIER.
1. A 7/8” opening is provided on the bottom of the cabinet.
The control wiring should pass through the opening to the
provided connection points at J16, J17 and J18.
2. If an air flow switch or high limit humidistat is not used, jump-
ers must be installed before the humidifier will operate. On
J17, jump pins 2 and 4 together to bypass the high limit. On
J18, jump pins 1 and 2 together to bypass the air flow switch.
EXTERNAL MONITORING
Pins 1 and 2 connector J10, shown in Photo H, are provided for
indicating operation of the humidifier at a remote location. When
the unit is operating, pins 1 and 2 (EXT PWR) are closed. Pins 3
and 4 of connector J10 (EXT SRV) are provided to indicate the
need for service. A ‘Service Required’ button on the Home screen
of the LCD will indicate the type of service that is needed. Both
the EXT PWR and EXT SRV relays are rated at 125 Volts and 1
Amp maximum.
NETWORKING
If multiple units are required due to high capacity demand
(over 200 lbs. per hour, single unit), networking can be done. Units
can be interconnected with parallel signal wiring. This set up is
usually done to facilitate running multiple units from a single sig-
nal control (Humidistat, BMS System, etc.). For other networking
requirements, please contact factory.
Photo H
As mineral deposits build up within the cylinder the water
level will slowly rise to uncovered electrode surfaces to
maintain the desired steam output rate. When mineral
deposits have covered all available electrode surface
areas, current flow will be reduced to a level where the
desired steam output cannot be reached and the service
light will signal the need for maintenance. When the
cylinder is filled with minerals it is easily changed in less
than five minutes, not including cool down time.
Important Note: Due to the many variables effecting the
operation of humidifiers (water condition, conductivity and
hardness, etc.) it could take up to 24 hours of operation
before a humidifier is truly operating normally and the water
is completely conditioned. Conditioned water is a state
where the amount of minerals dissolved within the water
is at a steady state. Conditioned water is more conductive
than new water from the fill valve.
The circuit board also closes a power contactor allowing
current to flow to vertical electrodes sealed inside the
cylinder. Current flows between the electrodes using
minerals in the water as a conductor. The water is heated
to boiling and converted to steam which leaves the cylinder
through the flexible steam hose which is connected to the
steam distributor pipe.
The circuit board reacts to current flow between the
electrodes and automatically opens the fill solenoid valve
when more water is required to maintain the desired out-
put rate, and closes when the desired rate is reached.
The operation of the drain solenoid valve is automatically
controlled by the circuit board which responds to any
changes in water conditions and drains the required quanti-
ty of water to provide stable operation and long cylinder life.