Armstrong World Industries EHU-700 Series User Manual
START-UP PROCEDURE FOR ARMSTRONG SERIES EHU-700 HUMIDIFIERS
The following steps should be performed on all newly installed Series EHU-700 Humidifiers to ensure
that the humidifier and the entire humidification system functions correctly.
that the humidifier and the entire humidification system functions correctly.
BEFORE TURNING ON THE POWER
Figure 14-1
1) Examine the wiring and the components
in the electrical compartment.
2) Check for any loose wires or quick-
connect terminals that may have been
pulled loose.
pulled loose.
3) Using a screwdriver, TIGHTEN ALL
SCREW TERMINALS on the power
supply terminal block, ground lug, and
contactor (Figure 14-1).
supply terminal block, ground lug, and
contactor (Figure 14-1).
Make sure all steam generator tank
connections are tight. Remember, a
loose joint is a HOT joint and could be a
fire hazard!
connections are tight. Remember, a
loose joint is a HOT joint and could be a
fire hazard!
4) Locate the low voltage terminal block
(Figure 14-1).
Verify that an airflow switch is
connected between terminals 9 and 15
or that there is a jumper installed. If an
airflow switch is installed, ensure that
there is airflow.
connected between terminals 9 and 15
or that there is a jumper installed. If an
airflow switch is installed, ensure that
there is airflow.
Verify that a high limit stat is connected
between terminals 10 and 14 or that a
jumper is installed.
between terminals 10 and 14 or that a
jumper is installed.
5) Turn on the water supply - Check for
leaks.
TURN ON POWER AT THE CIRCUIT BREAKER
6) The following should happen:
a) The Demand Mode and Tank Off lights will be illuminated. The stat demand will be
displayed.
b) If the stat demand displayed is greater than 35%, the Tank Off light will go out and a few
seconds later the Fill Light will go on. The unit will begin to fill.
14
Current
Transformers
Transformers
Contactors
Power Supply
Terminal Block
Terminal Block
Low Voltage
Terminal Block
Terminal Block