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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.
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.
3) Using a screwdriver, TIGHTEN ALL
SCREW TERMINALS on the power
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!
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.
Verify that a high limit stat is connected
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
Contactors
Power Supply
Terminal Block
Low Voltage
Terminal Block