DriSteem D77 User manual

MODEL D77
Controller
DEHUMIDIFIER CONTROL
Installation, Operation, and
Maintenance Manual
Read and save these instructions

Table of contents
SPECIFICATIONS .............................................................4
Overview and specifications.................................4
Mount control ...........................................5
INSTALLATION ..............................................................5
OPERATION ...............................................................10
System checkout ........................................10
Error Codes ...........................................13
TROUBLESHOOTING.........................................................13
Model D77 troubleshooting guide ............................14
RL-31 dehumidifier diagnostic codes ..........................15
WARRANTY ...............................................................19
2D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Warnings and cautions
CAUTION
1. Read all instructions before beginning installation.
2. Do not use in pool applications. Pool chemicals can damage the control.
3. Do not use solvents or cleaners on or near the display and circuit board.
Chemicals can damage components.
WARNING
1. Improper installation may cause property damage or injury. Installation,
service, and maintenance must be performed by a qualified service
technician.
2. Line voltage may cause serious injury from electric shock. Disconnect
electrical power before starting installation or servicing. Leave power
disconnected until installation/service is completed. This control is not a
120 Volt (line voltage) device.
WARNINGS
Fill in the following information for your records
Date of purchase ______________________________________________________________
Customer's name ______________________________________________________________
Model number ______________________________________________________________
Serial number ______________________________________________________________
3
D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

SPECIFICATIONS
Table 4-1: D77 controller specifications
Electrical
Input Voltage: 24VAC +/-20%
Current: 25mA (nominal), 50mA (max.) at 24VAC
Output Dry Contact, Normally Open
Control
Control Range 35% – 80% RH
Accuracy +/-5% RH
Differential 3%
Low Limit 40°F (4°C) Dew Point
High Limit 99°F (37°C) Dry Bulb
OVERVIEW
The control allows the user to set and adjust the humidity setting and turn
dehumidification on or off from a convenient location. In this application, the
Model D77 uses an onboard sensor to monitor the relative humidity (%RH) in
the space in which it is located and displays the measured relative humidity on
the digital display.
Overview and specifications
4D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

5
FEET
NONO
18"
MINIMUM
NO
90-1640
Mount control
• In the area where moisture levels need to be monitored and controlled.
• On an interior wall.
• At least 18” from an outside wall.
DO NOT MOUNT CONTROL
• In the flow of a supply register.
• Behind doors, in corners or other dead air spaces.
• In direct sunlight, near lighting fixtures, or other appliances that give off
heat.
• On an outside or unconditioned area wall.
• In stairwells or near outside doors.
• On a wall with concealed pipes or ductwork.
INSTALLATION
FIGURE 5-1: MOUNTING LOCATION
5
D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

PULL APART
BACK PLATE
FRONT COVER
ANCHOR
BACK PLATE
SCREW
90-2504
90-2485
Mount control
FIGURE 6-1: DISASSEMBLE CONTROL
FIGURE 6-2: MOUNT BACK PLATE
INSTALLATION
6D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION
• 18-22 gauge wire (field supplied), 4 wires required, run new cable as
needed.
• (2) #8 x 1-1/2" mounting screws (supplied)
• (2) Anchors (supplied)
1. Level the back plate on the wall and mark the mounting holes and wire
access location on the wall.
2. Drill two 3/16" mounting holes and a 3/4" wire access hole. See Figure
6.
3. Install the drywall anchors flush with the wall surface.
Note: Mounting holes on the back plate are designed to fit on a horizontal
J-box.
4. Run a 4-wire cable from the dehumidifier to the wall mount location and
through the square hole in the back plate.
5. Secure the back plate to the wall using the two #8 x 1-1/2" screws.
Required components
7
D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

+ - A B ODT
SensorRemote
Gh Rf Cf Gs YW
HVAC EQUIP.
MODEL D77
CONTROL
DH
DH
R/+
C/-
B
A
90-2490
1. Disconnect power to the dehumidifier and HVAC system.
2. Remove the wiring access cover next to the control on the dehumidifier.
3. Wire the Model D77 to the dehumidifier as shown in Figure 8-1.
FIGURE 8-1: MODEL D77 WIRING WITH DRISTEEM DEHUMIDIFIERS
Wiring D77 with DriSteem dehumidifiers
INSTALLATION
8D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Wiring D77 with Dristeem Dehumidifiers
4. Snap the wiring access cover
back into place, power up the
dehumidifier and use the ON/
OFF button to turn the unit OFF (if
ON). See Figure 9-1.
5. Press and hold the MODE button
for 3 seconds to enter the Installer
Set Up menu. REMOTE DISABLED
will appear on the display when
Installer Set Up is entered.
6. Press the or button to
change to REMOTE ENABLED.
7. Repeatedly press the MODE
button until DONE appears on
the display.
FIGURE 9-1:
90-1854
FIGURE 9-2:
90-1854
INSTALLATION
9
D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

90-2483
90-1636
Model D77 Control
Model D77 LCD Display
Blinking ON + *: Control Limit
Exceeded.
See Control Limits, page 11.
Solid ON:
Control On
Blinking ON:
Dehumidifying
Measured
Humidity or
Setting Control On/Off
Humidity Setting and
Offset Adjustment
Control must be ON
to adjust offset and
setting.
SET: Shows when
humidity setting
displayed or
being changed.
OFF: Control Off
FIGURE 10-1: EXTERNAL CONTROL
System checkout
POWER UP
1. Check all wiring.
2. Plug in dehumidifier and restore power to the HVAC system.
3. Turn on/off switch on dehumidifier ON. After a 4 second start up
sequence all buttons on the Model D77 will be functional.
• The control will be OFF.
• The humidity setting will be 60%.
• The control will display the measured humidity.
OPERATION
10 D77 CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL