Robertshaw DSL-520P - Manual (Page 8)

COMMUNICATION
The thermostat and the SZP control module are in constant communication with each other at
1200 baud using a RS485 interface. The satellite dish symbol
✬ will appear in the lower left-
hand corner of the display when the units are communicating properly. During communica-
tion the uplink symbol (
✭ ) will flash randomly. The satellite dish symbol ✬ disappears if the
DSL-520P loses communication with the SZP control module. The thermostat receives the
following operating parameters from the control module:
- temperature setpoint values
- morning, day, evening, and night event schedules
- time of day and outdoor temperature value
OPTIONAL FEATURES AND EQUIPMENT
The following are some of the options available for your electronic thermostat to further
enhance and expand its capabilities. The following are descriptions only. Refer to the instruc-
tions provided with these components for wiring information.
SL-IDS REMOTE INDOOR TEMPERATURE SENSOR
The Robertshaw remote indoor sensor (SL-IDS) is easy to install and provides accurate digital
communication of room temperature to the controlling thermostat from up to 300 feet (90m),
using 3-wire, 18-24 AWG unshielded copper cable wired directly to the thermostat (RS2, RS1,
and RS+V). There are no switches to set. The thermostat detects the remote sensor connection
5
24L: 24VAC transformer
24N: 24VAC transformer common
PC: power damper closed
24N: common
PO: power damper opened
Power to the dampers is provided by the 24L and 24N terminals at each zone terminal strip.
Refer to section 3.4 of the SZP manual for information on sizing transformers.
WIRING INFORMATION
Use #18AWG (nonshielded) copper wire for all system wiring; thermostats may use 18-24
AWG wire. Thermostats and damper actuators may be located up to 300 ft. (90m) from the
control module. All system wires should be tagged to identify thermostat, damper and equip-
ment wiring. Refer to section 4.2 of the SZP manual for the control module wiring diagram. It
is strongly recommended that a spare or third wire be run between the control module and each
zone damper in the event that a three (3) wire damper actuator is used or required in the future.
CURRENT LIMITED OUTPUT TERMINALS
All output circuits on the SlimZone Premier control module incorporate self-resetting current
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