DEZ
S
ERIES
1000
I
NSTALLATION
,
O
PERATION AND
M
AINTENANCE
M
ANUAL
15
the electrical connections to the main power terminal
block (TB1) are made. Use caution when servicing the
unit. For wiring details, refer to the electrical drawing
for this unit.
Even with the optional Disconnect
switch in the Off position, incoming power may still
be live between the switch and the main power
source. Power must be disconnected from the main
source before servicing.
4.6 Emergency Stop
The unit may be equipped with an optional emergency
stop switch button mounted on the control panel.
Press the button to disconnect control power from the
unit to cease operation. To restore control power,
twist the switch button to release it and it will return to
the normal position.
NOTE:
The emergency stop switch disconnects
control power from the unit contactors, causing them
to open. Main power remains present inside the unit
after the emergency stop switch is pressed.
4.7 Dampers
The unit may be equipped with an optional, manually
adjustable air damper for the process air outlet. The
damper is actuated by means of a slide/lock control
handle located on the side of the duct transition. An
internal slide gate damper is supplied as standard
equipment at the reactivation air outlet. The dampers
are used to adjust the process and reactivation
airflows for optimal unit performance after installation
of the ductwork is complete. Refer to section 3.6,
Monitoring Unit Performance.
4.8 Filter Status
The unit is equipped with 30% efficient pleated filters
on the process and reactivation air inlets. An optional
status contact may be assigned to these filters to
notify the user when they must be cleaned or
replaced.
!
CAUTION
Do not operate the unit without
filters. It is better to operate the unit with dirty filters
than no filters. Operating the unit without filters may
void the warranty.
4.9 Voltage Sensor/Phase Monitor
The unit may be equipped with either a voltage sensor
or a phase monitor device. A voltage sensor (used on
single phase units) causes the control power to be
interrupted in the event of low line voltage. A phase
monitor (used on 3 phase units) causes the control
power to be interrupted in the event of an incorrect
phase sequence, loss of a single phase, low voltage,
or voltage unbalance. This protects the unit’s motors.
An automatic reset occurs when the fault condition is
corrected. An LED on the device will illuminate to
indicate that operating conditions are normal.
4.10 Process Air Proving
The unit may be equipped with an optional process air
proving switch. Operation of the dehumidifier’s
reactivation circuit is enabled only when there is
process airflow. The process air proving switch closes
when the unit is turned on and the air proving switch
has detected sufficient airflow. The switch opens upon
loss of process airflow, disabling the reactivation
circuit. An alarm is signaled if process airflow is
inadequate. When the airflow problem is corrected
and the alarm is reset, the reactivation heater
automatically resumes normal operation.
4.11 E
2
Controller and Display
Figure 8 - E
2
Controller and Display
The unit may be equipped with an E
2
microprocessor-
based controller located in the main electric box. The
controller is furnished with factory configured software
designed to maintain space or process discharge air
conditions (temperature and/or humidity).
A display/keypad is provided for interaction with the
system controller. It may be located in the main
electric enclosure, in a separate “window” box
mounted on the unit or shipped loose for field
installation.
Press the alarm ( ) key on the keypad to call up
alarm screen messages. After the alarm condition is
corrected, press the alarm key again to reset the
controller and resume normal operation.
