DriSteem RL-31 User manual

RL-31
DEHUMIDIFIER
CDS DEHUMIDIFIER
Installation, Operation, and
Maintenance Manual
Read and save these instructions

2CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
WARNING CAUTION
Indicates a hazardous situation that could result in death or
serious injury if instructions are not followed.
Indicates a hazardous situation that could result in damage to or
destruction of property if instructions are not followed.
WARNING
• High voltage may cause serious injury from electric shock. Disconnect electrical power before starting installation or
servicing. Leave power disconnected until installation/service is completed.
• Sharp edges may cause serious injury from cuts. Use care when cutting plenum openings and handling duct work.
• Dropping may cause personal injury or equipment damage. Handle with care and follow installation instructions.
Warnings and cautions
CAUTION
• Read all instructions before beginning installation.
• This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning
use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not
play with the appliance.
• Do not use in pool applications. Pool chemicals can damage the dehumidifier.
• Do not use solvents or cleaners on or near the circuit board. Chemicals can damage circuit board components.
• Wait 24 hours before running the unit if it was not shipped or stored in the upright position.
• If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons
in order to avoid a hazard.
• If hard wiring the appliance, install a disconnect within eyesight of the appliance which provides full disconnection
under overvoltage category III conditions. Refer to local and national codes and full instructions on page 16.

3
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Table of contents
ATTENTION INSTALLER
Read this manual before installing.
Leave manual with product owner.
DriSteem®Technical Support
800-328-4447
WHERE TO FIND MORE INFORMATION
Our web site:
The following documents are available on our
web site: www.dristeem.com
• CDS Dehumidifier Brochure
• CDS Dehumidifier IOM
Call us at 800-328-4447
Obtaining documents from our web site is the
quickest way to view our literature.
Learn More
OVERVIEW.................................................................4
Product overview.........................................4
Models, capacities, and electrical specifications ...................5
SPECIFICATIONS .............................................................5
INSTALLATION ..............................................................6
Dimensions .............................................6
Selecting a location ......................................7
Mounting ..............................................8
Drain installation ........................................10
Round duct ............................................12
Hard wire - line voltage ...................................16
System set-up & checkout ..................................17
Wiring and setup .......................................19
Alternative external control or DriSteem BACnet®dehumidistat ........21
Daisy chain wiring ......................................22
TROUBLESHOOTING.........................................................25
RL Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
REPLACEMENT PARTS ........................................................27
WARRANTY ...............................................................32

4CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Dehumidifer Control
Electrical Panel
Access Door
ON/OFF button
used to turn
dehumidifier on
and off
Up/Down
buttons used
to change
humidity setting
MODE button
used for
optional features
Inlet
Filter
Outlet
90-2528
Product overview
OVERVIEW
FIGURE 4-1: CDS DEHUMIDIFIER

5
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Models, capacities, and electrical specifications
SPECIFICATIONS
Table 5-1:
RL Series Specifications
Model RL-31
Electrical
Voltage 208 - 240 VAC, 1 Phase,
60 HZ 277 VAC, 1Phase, 60 HZ
Operating Current 19.6A @ 80°F (26.7°C),
60% RH, 240 VAC 17.4A @ 80°F (26.7°C), 60% RH, 277 VAC
Rated Current 24A (install on dedicated 30A circuit)
Efficiency 3.0 L/kWh @ 80°F (26.7°C), 60% RH, 240 VAC
Environmental
Operating Temperature Range 50°F to 104°F (10°C to 40°C), 60°F (15.6°C) @ 40% RH to 85°F (29.4°C) @ 80% RH
(ideal conditions for unit to not go into defrost or shut down due to high pressure)
Operating Dew Point Lower Limit 36°F (2°C)
Mechanical
Dimensions
Width 44.88” (1140 mm)
Height 34.41” (874 mm)
Length 31.72” (806 mm)
Weight 360 lbs (163 kg) (without packaging)
Drain Size 3/4" FNPT (DN 20)
Capacity 89 gallons/day @ 80°F (337 Liters/day @ 26.7°C), 60% RH (31 lbs/hr)
Filter MERV 11 (30" x 32" x 2")
Airflow 1760 CFM (2990 m3/h) (free flow)
Power cord Units shipped with 10' (3m) power cord or can be hard wired.
Controls
Dehumidifier control 50°F and 104°F (10°C to 40°C) cut off
External control Off on high/low pressure

6CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
90-2529
FIGURE 6-1: CDS DEHUMIDIFIER DIMENSIONS
Dimensions
34-13/32 (874 mm)
BACKTOP
Up to 1/2" (DN 15) diameter rod
30 (762 mm)
31-23/32 (804 mm)
42-11/16 (1084 mm)
43-25/32 (1112 mm)
44-7/8 (1140 mm)
15-23/32 (399 mm)
ø 3/4" (DN20) FNPT drain
6-1/4 (159 mm)

7
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
90-2530
UNPACKING THE DEHUMIDIFIER
Disassemble the carton, but leave the unit attached to the pallet for installing
the unit with a forklift or scissors lift.
INCLUDED IN THE CARTON
• Dehumidifier
• Installation manual
• 3/4" (DN20) P-Trap
• 3/4" MNPT x 3/4" (DN20 x 20 mm) female pipe
• 3/4" x 3/4" x 3/4" (DN20 x DN20 x DN20) T-fitting
• 30 feet of thermostat cable
• MERV 11 filter
• Model D77 control (ships separately, if selected)
LOCATION CONSIDERATIONS
This unit is not to be accessible to the general public. The dehumidifiers should
be spaced evenly throughout the area to be dehumidified with the following
recommendations:
1. Avoid placement where the discharge of one dehumidifier is pointing
toward the inlet of another.
2. Avoid locating the dehumidifier inlet too near a supply register. Space is
not usually available to totally avoid this, but minimizing the amount of
cold air that is discharged to the dehumidifier inlet will improve moisture
removal performance of the dehumidifier.
3. Account for handling dehumidifier condensate by considering drain or
condensate pump locations.
4. Leave 18" (457 mm) minimum clearance for access to the user interface,
electrical panel for service and filter for maintenance.
FIGURE 7-1: SPACE CLEARANCES
Selecting a location
INSTALLATION
Electrical
service panel
FIGURE 7-2: D77 CONTROLLER
18"
(457mm)
minimum
18" (457mm)
recommended
Inlet side

8CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
PARTS
INCLUDED
IN KIT
90-2533
90-2532
FIGURE 8-1: FLOOR MOUNTING USING LEVELING FEET KIT (PART #: 601175)
FLOOR MOUNTING
The leveling feet kit (not included) is required for floor mounting. The drain
hose/pipe must continuously slope downward toward the drain. Use solid
supports as needed to elevate the unit enough to allow for continuous drain
slope. Use the adjustable feet to level the unit right to left and front to back so
that unit drains properly.
Mounting
INSTALLATION
Blocking must be used for p-trap clearance
3-1/4" (83 mm)

9
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
90-2531
90-2531
Mounting
HANGING THE DEHUMIDIFIER
Use 3/8" (10 mm) or 1/2" (12 mm) threaded rod to suspend the unit from
appropriate ceiling structure (see Figure 9-1). The unit weight is 360 lbs
(163 kg). Install vibration isolators if located in an area where noise could be
a concern. Level unit right to left and front to back so that unit drains properly.
IMPORTANT: Install lock nuts to secure the dehumidifier to the threaded rod as
shown in Figure 9-2.
DUCTING
Use duct kit (Part #: 601177) for installing ductwork to the dehumidifier.
Reference the instructions provided with the duct kit for installation details.
FIGURE 9-1: SUSPENSION
FIGURE 9-2: SECURE BRACKET TO DEHUMIDIFIER
Double nut each corner with flat
washer per illustration
4X vibration
isolators
(optional)

10 CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
3/4" MNPT X 3/4"
FEMALE PIPE
(INCLUDED)
P-TRAP
(INCLUDED)
3/4" PIPE X 3/4" PIPE COUPLING
(NOT INCLUDED)
PVC HARD PIPE
(NOT INCLUDED)
3/4" PIPE TEE
(INCLUDED)
3/4" MNPT X 3/4"
FEMALE PIPE
(INCLUDED)
P-TRAP (INCLUDED)
3/4" FEMALE PIPE X 3/4" FNPT (INCLUDED)
3/4" MNPT X 3/4" BARB (NOT INCLUDED)
3/4" FLEXIBLE TUBE
(NOT INCLUDED)
HIGHER
THAN
FILTER
FRAME
OPTIONAL
VACUUM
BREAK
3/4" MNPT X 3/4"
FEMALE PIPE
(INCLUDED)
P-TRAP
(INCLUDED)
3/4" PIPE X 3/4" PIPE COUPLING
(NOT INCLUDED)
PVC HARD PIPE
(NOT INCLUDED)
3/4" PIPE TEE
(INCLUDED)
3/4" MNPT X 3/4"
FEMALE PIPE
(INCLUDED)
P-TRAP (INCLUDED)
3/4" FEMALE PIPE X 3/4" FNPT (INCLUDED)
3/4" MNPT X 3/4" BARB (NOT INCLUDED)
3/4" FLEXIBLE TUBE
(NOT INCLUDED)
HIGHER
THAN
FILTER
FRAME
OPTIONAL
VACUUM
BREAK
90-2534
The blower draws air through the dehumidifier, putting the cabinet under
negative pressure. As a result, the included P-trap is required for proper
draining. The installed drain fitting on the dehumidifier is 3/4" (DN20) FNPT.
Use the included fittings to trap and install the drain. See Figure 10-1. The
drain tubing can be hard pipe or flexible tubing. NOTE: PTFE thread seal tape
is recommended for the threaded connections and hand tighten only. Use PVC
primer and cement for all slip fit connections to prevent leaks. After installing
the drain connections, trap, and tubing, pour enough water, about 32 oz.
(950 mL) into the dehumidifier drain pan to prime the trap.
If the drain tubing will be installed to a condensate pump, or if a common
drain tube will serve multiple dehumidifiers or air conditioners, a vacuum
breaker is recommended to prevent the p-trap from being unintentionally
siphoned. Install a T-fitting with a short section of drain tubing pointed vertically
and extending above the start of the filter (see Figure 10-1). Install the
vacuum breaker after the P-trap.
Drain installation
FIGURE 10-1: DRAIN ASSEMBLY
INSTALLATION

11
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
FLOAT
Switch
DH DH
NORMALLY CLOSED
FLOAT SWITCH
90-1857
CONDENSATE PAN, CONDENSATE PUMP AND FLOAT SWITCH
A condensate pan is recommended when suspending the dehumidifier over
finished areas or product. Adhere to local codes regarding draining of the
condensate pan. If a condensate pump is needed, install it in the condensate
pan (user provided) as well.
Install a condensate overflow safety switch (i.e. float switch) in the condensate
pan (user provided), remove the factory installed jumper wire between
the Float Switch terminals on the control and wire the float switch to the
dehumidifier as shown in Figure 11-1. Overflow safety switches on
condensate pumps can be wired to the Float Switch terminals in a similar
fashion.
FIGURE 11-1: FLOAT SWITCH WIRING TO USER INTERFACE
Drain installation

12 CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Round duct
HOUSING OUTLET
MODEL RL-31 DEHUMIDIFIER
HOUSING INLET
SCREWS x40
SEALING PLUGS x3
FILTER ACCESS DOOR
THUMB SCREWS x2
24" (610 mm) INLET RING x2
CAUTION
Sharp edges may cause serious injury from cuts. Use care
when cutting plenum openings and handling duct work.
NOTICE
• Failure to follow ducting guidelines may negatively
impact unit performance.
• Minimize equivalent duct length to maximize unit
capacity and efficiency.
90-2578
AIRFLOW DELIVERY SPECIFICATIONS
• Nominal airflow through dehumidifier is 1760 cfm
(2911 m3/h).
• Airflow decreases as duct length and bends increase,
therefore if the equivalent duct length is too long the
dehumidifier will cease to function properly.
INSTALLATION

13
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
90-2579
• If using registers and diffusers, the total open area must
be at least 453 in2 (0.3m3), which is the equivalent
area to a 24 inch (610 mm) round.
• When locating registers and diffusers be aware of the
following;
• Relative to other dehumidifier inlets/outlets – must
be a minimum 10 feet (3 m) apart and do not direct
toward one another.
• Relative to HVAC diffusers – ensure minimum 10
foot (3 m) distance from other HVAC diffusers.
• For agriculture applications – do not directly vent
onto plants.
• Ensure that the ductwork is supported within 2 feet
(0.6 m) of inlet and outlet of the dehumidifier. Consult
building codes and standards for duct support
requirements beyond 2 feet (0.6 m) of the dehumidifier.
DUCT SIZING AND ROUTING
• Inlet and outlet collars fit 24" (610 mm) round duct.
• Unit performance decreases as airflow decreases,
the shortest possible duct lengths with minimal bends
should be used.
• Do not exceed 1,000 feet (305 m) of metal duct or
750 feet (229 m) of flex duct.
• Max static pressure is 0.6" w.c. (149 Pa).
• Install the dehumidifier in location where filter door,
service access panel, compressor side panel, and
user interface are accessible.
• Do not install a bend in the ductwork within 2 feet
(0.6 m) of the dehumidifier inlet or outlet.
• When selecting duct material, it is preferred to use
metal ducting to maintain airflow. If flex duct is to be
used, ensure it is extended out as much as possible
to limit disruptions to the airflow. Note:Use only
insulated ducting when the inlet side of the duct
work is located outside of the conditioned space.
In some instances when the dehumidifier is placed
outside of the conditioned space, the cabinet of
the dehumidifier may also need to be insulated to
prevent condensation formation on the exterior of the
unit.
• Do not duct more than one dehumidifier together. See
Figure 13-1.
FIGURE 13-1: DO NOT DUCT MORE THAN ONE DEHUMIDIFIER
IN SERIES
Round duct
Table 13-1:
Equivalent length of bends
45° bend 5 feet (1.5 m)
90° bend 10 feet (3.0 m)
180° bend 30 feet (9.1 m)

14 CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
ALIGNMENT TABS x4
REMOVE 6 CLIPS
SEALING PLUGS
90-2582
90-2583
90-2584
DUCT KIT INSTALLATION
1. On each housing, bend the four alignment tabs so
they are protruding out of the front as shown. These
are to be used as alignment features for the 24" (610
mm) collar. See Figure 14-1.
2. Attach the assembled duct housing to the dehumidifier
using screws provided. Additional holes will need to
be made in the cabinet where holes did not previously
exist. To properly seal the unit, use a 5/32" (4 mm)
bit to pre-drill holes and use the screws provided.
If you choose to use self drilling screws, make sure
they are no longer than 1" (25 mm). To secure the
3screws on the left side of the duct kit (opposite the
filter access door), a bit extension of at least 6" (152
mm) is required. After securing all screws, insert the
sealing plugs provided into the access holes on the left
hand side. See Figure 14-2.
3. Install the filter access door and secure with the two
thumb screws. See Figure 14-3.
FIGURE 14-1: ALIGN TABS
FIGURE 14-2: ATTACH ASSEMBLED DUCT HOUSING
FIGURE 14-3: INSTALL
Round duct
INSTALLATION

15
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
90-2580
REPLACING THE FILTER
1. Loosen the two thumb screws and remove the filter access door.
2. Pull the filter away from the unit, then out through the access opening.
3. Install the new filter in the same direction.
4. Reinstall the filter access door and tighten the thumb screws.
FIGURE 15-1: OVERALL DIMENSIONS WITH DUCT KIT (INCHES)
Round duct
54.70 (1389 mm)
SIDE
TOP
43.20 (1097 mm)
34.36 (873 mm)
17.22
(437 mm)
16.69
(424 mm)
ø23.75
(603 mm)
44.86
(1139 mm)

16 CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
GREEN (GROUND)
L2 L1
WHITE (L2)
BLACK (L1)
HARD WIRING
ACCESS
ELECTRICAL
SERVICE PANEL
MOV BOARD
TERMINAL
BLOCK
DISCONNECT POWER
CORD WIRES
CONNECT THE LINE (BLK)
AND NEUTRAL (WHT) WIRES
TO MOV BOARD AS SHOWN
CONNECT
GROUND
TO LUG
MOV BOARD
90-2543
90-2535
Hard wire - line voltage
United States Installation: Make all electrical connections in accordance
with the current edition of the NEC ANSI/NFPA 70 and any local codes or
ordinances that may apply.
Canada Installation: Make all electrical connections in accordance with the
current edition of the Canadian Electrical Code CSA C22.1 and any local
codes or ordinances that may apply.
The RL-31 dehumidifier comes with a power cord that has a NEMA L6-30 plug
that can simply be plugged into a corresponding NEMA L6-30 receptacle. See
Figure 16-1 for power cord wiring connections. The plug can be removed
and replaced by hard-wired electrical service if desired.
1. Disconnect electrical service at the main fuse or circuit breaker.
2. Run electrical service to where the dehumidifier is to be installed following
all required local and national codes and standards.
3. Remove the electrical service panel (see Figure 16-2).
4. Depress the levers of the terminal blocks mounted on the MOV board to
disconnect the black and white power cord wires.
5. Remove the screw securing the power cord ground wire to the cabinet.
6. Route the service wires through the opening in the dehumidifier and secure
the cable or conduit to the opening in the dehumidifier using fittings/
clamps intended for the conduit/cable used.
7. Insert the black service wire into the L1 terminal and the white service wire
into the L2 terminal. Release levers to lock into place.
8. Insert the ground wire (bare or green) of the electrical service into the
ground lug and secure it in place by tightening the ground lug screw.
9. Reattach the electrical service panel to the dehumidifier.
10.Restore electrical service at the fuse or circuit breaker.
CAUTION
If the supply cord is damaged, it must
be replaced by the manufacturer, its
service agent or similarly qualified
persons in order to avoid a hazard.
Table 16-1:
Electrical specifications
Model RL-31
Voltage 208 - 240 VAC, single phase,
60Hz 277 VAC, single phase, 60Hz
Recommended
Breaker Size 30A 30A
Recommended Wire
Gauge 10 Gauge, Copper 10 Gauge, Copper
Maximum Fuse or
Breaker Size (MOC)
40A at 208V
35A at 240V 30A
Minimum Circuit
Ampacity (MCA)
28A at 208V
25A at 240V 21A
FIGURE 16-1: POWER CORD WIRING
FIGURE 16-2: HARD WIRING TO REPLACE
THE POWER CORD
INSTALLATION

17
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLER TEST MODE
If everything is properly wired, the dehumidifier and all of the wired
components will turn on and off during Installer Test Mode to demonstrate that
all are properly operating. Installer Test Mode lasts for four (4) minutes. If the
ON/OFF button is pressed during test mode, the dehumidifier will exit Installer
Test Mode and return to the OFF screen.
1. If the dehumidifier is not already OFF, press the ON/OFF button to turn it
off (see Figure 17-1).
2. Press and hold the ON/OFF button and MODE buttons for 3 seconds. The
measured humidity, AIR SAMPLING and TEST will show on the display (see
Figure 17-2).
3. After three (3) minutes the dehumidifier compressor will turn on and
DEHUMIDIFYING will replace AIR SAMPLING on the control screen (see
Figure 17-3).
After one minute of compressor operation, all outputs will turn off and DONE
(Figure 17-4) will blink for 3 seconds and then return to the OFF screen
(Figure 17-5).
System set-up & checkout
90-1854
FIGURE 17-1: DISPLAY SCREEN OFF
90-1854
FIGURE 17-2: AIR SAMPLING TEST
90-1854
FIGURE 17-3: DEHUMIDIFYING
90-1854
FIGURE 17-4: DISPLAY SCREEN DONE
90-1854
FIGURE 17-5: DISPLAY SCREEN OFF
INSTALLATION

18 CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
System set-up & checkout
• A Model D77 or other external control is to be installed
• Changing the air sampling rate (see instructions below)
1. Check all wiring.
2. Make sure the wire access cover has been snapped back onto the
on-board control.
3. Plug unit in and turn power switch to ON.
4. The on-board control screen should display OFF (see Figure 18-1).
NOTE: If the display backlight is not on, the first button press (any button) will
only turn on the backlight. Press the button a second time to achieve function.
5. Hold the MODE button on the on-board control for 3 seconds to enter the
Installer Set-up Menu.
6. Navigate through the following screens to set up the dehumidifier for the
installed application.
Use the UP or DOWN arrows to select items and use MODE to switch to
the next set-up option. To exit installer set-up, all options must be scrolled
through using the MODE button.
7. After the installer set up options have been completed, DONE (see Figure
18-2) will blink for 3 seconds and the control will return to the OFF
screen (see Figure 18-1).
If remote control and external control are both disabled (default), the
control will be by the on-board controller. Air sampling and RH Offset are
MODE options only available with on-board control.
AIR SAMPLING
Use the UP or DOWN button to adjust how frequently the dehumidifier samples
the air to determine whether or not to dehumidify. Fewer minutes means the
dehumidifier will sample more frequently to minimize humidity swings, but
increases cost to operate due to more frequent fan operation. Press MODE
when done to move to the next screen (see Figure 18-3).
RH OFFSET
An offset can be applied to the on-board humidity reading to avoid
discrepancies with other humidity measuring devices. Use the UP/DOWN
arrows to select an offset from -5% to 5%. Press MODE to exit the installer set-
up screens (see Figure 18-4).
90-1854
FIGURE 18-1: DISPLAY SCREEN OFF
90-1854
FIGURE 18-2: DISPLAY SCREEN DONE
90-1854
FIGURE 18-3: AIR SAMPLING
90-1854
FIGURE 18-4: RH OFFSET

19
CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
+ - A B ODT
SensorRemote
Gh Rf Cf Gs YW
HVAC EQUIP.
MODEL D77
CONTROL
DH
DH
R/+
C/-
B
A
90-2490
Wiring and setup
The Model D77 will measure the relative humidity and turn the dehumidifier on
and off to control the humidity level to the desired setting. The humidity setting
can be adjusted from the control, while the display allows easy access and
monitoring of the humidity level in the space. Shield the Model D77 from direct
exposure to HPS or LPS lighting.
NOTE: Use 18-22 AWG wire for control wiring.
Humidity can be controlled using the internal dehumidifier control, a Model
D77 control, or a different external control like a thermostat.
Installing an external control eliminates the need to run the dehumidifier blower
for sampling, as the control is constantly measuring the humidity. When the
humidity level rises above the setting, the dehumidifier is turned on. With
internal control, the sampling rate can be set to 15,30,45, or 60 minutes.
TO INSTALL AND USE THE MODEL D77 CONTROL, COMPLETE ALL STEPS:
1. Unplug the dehumidifier or turn off power to the circuit at the breaker or
fuse.
2. Run thermostat cable (use 18-22 AWG wire) from the Model D77 to the
control of the dehumidifier.
3. Trim about 1/4" (6 mm) of insulation from the end of the wires on each
end. Insert the wire into the terminals as shown in Figure 19-1.
4. Restore dehumidifier power.
TO SET THE DEHUMIDIFIER TO USE THE MODEL D77 CONTROL, COMPLETE ALL
FIGURE 19-1: MODEL D77 REMOTE CONTROL WIRING

20 CDS DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
FIGURE 20-1: MODEL D77 REMOTE CONTROL WIRING
90-1854
Wiring and setup
STEPS:
1. With power to the dehumidifier, use the ON/OFF button to set the
dehumidifier to the OFF position.
NOTE: If the display backlight is not on, the first button press (any button)
will only turn the backlight on. Press the button a second time to achieve the
desired function.
2. Hold the MODE button on the on-board control for three seconds to enter
the Installer Set-up Menu.
3. The display should now read REMOTE on the left and DISABLED on the
right. Use the UP or DOWN arrow buttons to set this to ENABLED.
4. Once the display reads REMOTE ENABLED, press the MODE button to
cycle through the other settings until the display blinks DONE for three
seconds.
5. Use the ON/OFF button to turn the dehumidifier ON. The display on your
unit should read REMOTE.
6. Locate the Model D77 that you just set up. On the Model D77, press the
ON button and use the arrow buttons to set your preferred %RH setpoint.
When setting up in REMOTE mode for the first time, your dehumidifier will
wait three minutes before starting to dehumidify, regardless of ambient
conditions.
INSTALLATION