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MODEL A77 – REMOTE CONTROL AND WIRING
NOTE: Use 18-22 AWG wire for control wiring .
Humidity can be controlled using the internal dehumidifier control, a
Model A77 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
close to the canopy . When the humidity level rises above the setting,
the dehumidifier is turned on .
To install and use the Model A77 control, complete ALL steps:
1. Unplug the dehumidifier or turn off power to the circuit at the
breaker or fuse .
2. Run a 4-wire thermostat cable (use 18–22 AWG wire) from the
Model A77 to the control of the dehumidifier .
3. Trim about 1/4" of insulation from the end of the wires on each
end . Insert the wire into the terminals as shown in FIGURE 10 and
tighten to secure .
4. Restore dehumidifier power . There is a delay of three minutes after
restoring power before the dehumidifier will respond to the control .
5. Set up the dehumidifier to ENABLE REMOTE control as shown on page 9 .
6. See USING THE MODEL A77 OR EXTERNAL CONTROL on page 9 for start up instructions .
The Model A77 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 . It is
recommended that the Model A77 be mounted at/near canopy height . Shield the Model A77 from direct exposure to HPS or LPS lighting .
Press the ON button on the Model A77 to turn on the control . The UP/DOWN arrow buttons are used to set the desired humidity setting . At all other
times, the Model A77 will display the measured humidity level . Reference the Model A77 Installation and Operating Instructions for set-up .
ALTERNATE EXTERNAL CONTROLS
Alternatively, use any other humidity control system as long as it
has a dry contact, normally open output dedicated to controlling the
dehumidifier .
When using an external control, set up the dehumidifier to ENABLE
EXTERNAL control as shown on page 9 . Reference the installation
literature provided with the alternative control for wiring, set-up and
operating details .
8
FIGURE 10 – MODEL A77 REMOTE CONTROL WIRING
+ - A B
ODT
Remote
Sensor
FIGURE 11 – ALTERNATE EXTERNAL CONTROL WIRING
EXTERNAL
CONTROL
MODEL A77 CONTROL
A
B
C/-
R/+
DH
DH
90-1860
90-2542