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When set to EXTERNAL CONTROL, the blowers and rotor
motor run continuously. The heater will run when the low-
voltage control terminals are connected by a switch, remote
thermostat, timer, etc. The heaters are also limited to
120˚F incoming air temperature with automatically-resetting
thermal switches.
3.8.3 BALANCE Knob
The BALANCE Knob modulates the airflow through the
process plenum. To reduce the process airflow volume and
lower the humidity of the outlet air, turn the knob counter-
clockwise. To increase the process airflow and increase the
water removal rate, turn the knob clockwise.
3.8.4 Indicator Lamps
Three indicator lamps show at a glance whether the D850
is functioning properly. The REGEN AIR OK lamp illuminates
when there is sufficient airflow through the heaters. The
HEATER 1 lamp illuminates when the first heater bank is
energized. The HEATER 2 lamp illuminates when the second
heater bank becomes energized.
3.8.5 TOTAL RUN TIME Meter
The digital hour meter measures the cumulative time that the
unit is turned on to tenths of an hour. It stores and displays
the total when the unit is unplugged. It resets to zero after
99,999.9 hours of operation.
3.8.6 Low-Voltage Remote Thermostat Connection
The included thermostat can be connected here. Connect
one wire to each spring-loaded terminal. If the D850 is
placed inside the affected area, place the humidistat on top
of the unit. If the D850 is located outside the space to be
dried (e.g. ducting dry air into a tented chamber), the 25’
cord allows you to place the humidistat inside the affected
area.
In addition to the included humidistat, any dry-contact
switch or other type of control that electrically connects the
terminals will cause the heating elements to run. The remote
control circuit is low voltage (24VAC). DO NOT CONNECT
POWER TO THE TERMINALS.
4 Maintenance
4.1 Air Filter Replacement
The Phoenix D850 is equipped with two air filters that must
be checked regularly.
Process air stream filter:
This 20” x 20” x 2” filter is located in the top of your D850
inside the upper access door. Depress the snap buttons on
the sides to open the access door. The included filter carries
a MERV-8 filtration efficiency rating. This filter prevents
loading the desiccant wheel with foreign matter.
Reactivation air stream filter:
This 9” x 11 3/8” x 1/4” filter is located in the bottom of your
D850. To remove it, release the thumb screws and open the
access panel. Pull the filter out through the slot. To clean the
filter, run water through the aluminum mesh side and allow it
to dry completely before reinstalling. To reinstall, orient the
filter with the aluminum mesh side facing toward the unit,
then slide into the slot with the wide edge horizontal.
Operating the unit with dirty filters will reduce the
dehumidifier’s capacity and efficiency and may cause
the heater elements to cut out on thermal overload.
Replacement filters can be ordered from the factory. DO NOT
operate the unit without the filters or with less effective filters
as the desiccant wheel inside the unit will become clogged
and require disassembly to clean.
4.2 Blower Motors and Rotor Drive Motor
All motors on the D850 are permanently lubricated and do
not require maintenance.
4.3 Desiccant Rotor Cassette Assembly
The cassette can be easily removed to inspect and/or clean
the seals and rotor. Reverse these steps to reinstall the
cassette.
Step 1: Depress button (1A) and twist reactivation outlet
duct collar (1B) 15° counter-clockwise to remove.
Step 2: Unplug rotor drive motor wire connector (not shown).
Unhook spring (not shown), unscrew shoulder bolt (2A, using
1/8” allen key), then remove motor assembly (2B).
Step 3: Unplug 9-wire connector below cassette (3A). Twist
remaining 9-wire connector (3B) 1/8-turn counterclockwise to
remove.
Step 4: Using a T25 driver, remove 5 screws above cassette
(4A-4E), four screws below (4F-4I), and two at back of cabinet
(not shown).
Step 5: Slide cassette forward while holding wires out of the
way to remove.
Step 6: Installation is reverse of removal. Note that spring
attachment differs depending on sprocket orientation on
motor:
Figure 12: Removing the Desiccant Rotor Cassette.
Figure 10:
Figure 11: