DEZ
S
ERIES
1000
I
NSTALLATION
,
O
PERATION AND
M
AINTENANCE
M
ANUAL
14
4.0
UNIT
FEATURES
This unit may be equipped with one or more of the
following options. For a detailed list of the options
purchased with this unit, refer to the Dehumidifier
Identification Number (DIN) sheet provided with the
unit (see section 1.2.2). The DIN number for this unit
can be found on the DIN sheet.
4.1 Control Sensor Terminals
The unit is equipped with terminal positions for the
connection of a humidistat (S7) or relative humidity
transmitter (TN11) for utilizing the selected control
method (see section 3.4, Capacity Control). A
humidistat or relative humidity transmitter (optionally
provided) is required for the control scheme to
function. Refer to the electrical drawing for details on
interfacing the control sensor with the equipment.
4.2 Remote Start/Stop Contact
The unit may be equipped with optional terminal
positions to connect a remotely operated “Start/Stop”
control device. It may be used to start and stop the
unit when the mode selector switch is in the “Auto”
position. When the circuit is closed the unit will start
operating; when opened the unit will stop operating
(after the purge cycle). The contact must be correctly
sized to match the voltage and current requirements
of the circuit. Refer to the electrical drawing to
determine the correct rating for the contact and for
wiring details. NOTE: The unit will not start if the
space humidity is below setpoint.
4.3 Optional Customer Contacts
The unit may be equipped with optional customer
interface contact positions located on terminal blocks
in the electrical enclosure(s). The contacts are utilized
for remote monitoring and control purposes. Certain
status contacts may operate together with an
assigned status indicator light. Refer to the unit DIN
sheet to determine which status contacts and indicator
lights are provided with this unit.
NOTE:
Refer to the electrical drawing for specific ratings
of the contacts and for wiring details.
ROTOR ROTATION FAULT CONTACT
This contact closes if the rotor has not made a
complete revolution within a specified period of time.
PROCESS BLOWER INTERLOCK DRY CONTACT
This contact closes when the process blower is
operating. It can be used to indicate unit operating
status or to start and stop auxiliary equipment such as
a circulating fan or condensing unit.
SUMMARY FAULT CONTACT
This contact notifies the operator of such problems as
a heater fault, rotor motor fault or a fault with the
process and/or reactivation blower motors.
REACTIVATION AIR PROVING CONTACT
This contact closes when the unit is turned on and the
reactivation air proving switch detects sufficient
airflow. When the unit is on, the contact opens upon
loss of reactivation airflow and the reactivation heater
will be de-energized. When the airflow problem is
corrected, the heater will automatically re-energize.
PROCESS AIR PROVING CONTACT
This contact closes when the unit is turned on and the
process air proving switch detects sufficient airflow.
When the unit is on, the contact will open upon loss of
process airflow.
DIRTY FILTER CONTACT
This contact closes when the differential pressure
across the process or reactivation air filter reaches a
predetermined value, indicating that the filter should
be cleaned and/or changed. The differential pressure
gauges may be used to determine which filters should
be serviced (see section 3.6, Monitoring Unit
Performance).
4.4 Sensor Retransmit Terminals
The unit may be equipped with optional terminal
positions for monitoring unit performance by means of
analog output signals that indicate operating
parameters of the system. The system controller
translates signal inputs for temperature as measured
by the sensors. The controller retransmits the values
as output signals to terminal block(s) located inside
the electric box. Refer to the electrical drawing for the
analog output signals provided, their applicable range
and for wiring details.
4.5 Electrical Disconnect
The unit may be equipped with an optional fused or
non-fused electrical disconnect switch. A switch is
recommended and may be required by local or
national electrical codes. Rotary disconnects are
located on the front of the electrical enclosure. Knife-
style disconnects have a separate box located
adjacent to the electrical enclosure. The disconnect
switch allows power to be removed during
maintenance or service functions. If a disconnect
switch is not provided, the unit will have power when
