DEZ
S
ERIES
1000
I
NSTALLATION
,
O
PERATION AND
M
AINTENANCE
M
ANUAL
9
3.0 OPERATION
The following information provides an overview of
operating procedures and sequences for the DEZ
unit. Before operating the unit, go through the
checklist below to make sure all electrical and
utility connections are correct and that the unit is
ready for operation.
NOTE:
A Warranty Registration and Start-Up
Checklist are provided in the Technical Data
Package supplied with your unit. It must be
completed during installation and sent to STULZ
Product Support. It will assist if service or
troubleshooting support is needed
.
See section 8.0
for contact information.
3.1 Installation Checks
Using the Warranty Registration and Start-Up
Checklist forms, record the steps taken during
installation. Recommended tools for performing
the pre-operation checkout include a voltage
meter with temperature probe, a flashlight, a
Phillips and flathead screwdriver, and a digital
amp meter.
1. Verify the main power is correct per the Unit
Nameplate. Only use power that’s rated for
this unit per the Unit Nameplate. Incorrect
power may damage the unit and cause
damage to property or injury or death to
personnel.
2. Check the wiring to any remote sensors,
humidistats, start/stop devices, etc. Refer to
the electrical drawing for specific wiring
connections.
3. Check all electrical connections for
tightness.
4. Be sure there are no loose parts or spare
parts (such as extra filters, etc.) located
inside the unit or electric box.
5. Be sure all access panels or doors are
closed tight. Small air leaks can significantly
reduce unit performance.
3.2 Start Up
1. Apply main power to the unit and turn the
mode selector switch to On. Check that the
rotation of all motors, (process, reactivation,
and rotor drive motor), are as indicated by
the arrow labels.
2. Set airflows to the required rotor pressure
drop versus the airflow required for this
application. Airflow is indicated by rotor
pressure drop values as viewed on the
differential pressure gauges. The Unit
Nameplate shows the optimum
“Reactivation Side” and “Process Side”
pressure drops (labeled as “Rotor Pressure
Drop Gauge Values” with values shown as
in. w.g.). Process airflow is set using an
airflow damper (provided as an option),
located at the process air outlet.
Reactivation airflow is set using an internal
slide-gate damper. Refer to section 3.6,
“Monitoring Unit Performance” for a detailed
description on monitoring and setting
airflows.
3. Verify that amp draws of each component
are within ±10% of the ratings shown on the
Unit Nameplate.
4. Verify the operation of all switches and
safeties.
5. The green Unit On and red fault indication
lights are equipped with “press-to-test”
capability. This feature can be used to test
operation of the lamp element when main
power is on. If a “press-to-test” light does not
illuminate when pressed, it may be burned
out or the electrical connections may be
faulty.
6. Depending on the control methodology, set
the humidity or dew-point to the desired
setting with the system controller.
7. Insert a temperature probe into the
reactivation discharge opening and note the
temperature. The temperature leaving the
rotor can be as high as 180 °F. The
reactivation discharge temperature is
typically 120–140 °F at full heater output.
However, the dehumidifier may operate
above or below this range based upon
process and reactivation inlet air conditions
and volumes.
NOTE:
The reactivation air temperatures
mentioned above may vary between DEZ
systems. See the Technical Data Sheet for
your unit for target temperatures.
8. Verify the grain depression across the
system (in the process airstream) is correct
per the Unit Nameplate.
During basic unit operation, process air will enter
one side of the unit cool and humid and leave the
other side of the unit warm and dry. Reactivation
