AMX ViewStat, Instruction Manual

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Support Module Installation and Wiring
43
ViewStat Communicating Thermostat
Mode of Operation Set to "Humidify"
The B terminal is continually energized in the "Humidify" mode. When the thermostat calls for
humidity, the W1/HUM terminal will energize. If the minimum off time of 2 minutes has not
elapsed since the previous call, no terminals will energize until it has. All energized terminals will
remain energized for the minimum on time of 2 minutes.
Mode of Operation Set to "Dehumidify"
The O terminal is continually energized in the "Dehumidify" mode. When the thermostat calls for
dehumidification, the Y1/DEHUM terminal will energize. If the minimum off time of 4 minutes
has not elapsed since the previous call, no terminals will energize until it has. All energized
terminals will remain energized for the minimum on time of 4 minutes.
Troubleshooting Remote Sensors
Thermostat has no display: Check 24 VAC supply. Check for incorrect wiring between
the thermostat and support module. Incorrect wiring can damage the thermostat and
transformer or blow a fuse in the equipment.
Also, verify that all support modules have a unique address.
Thermostat displays very high temperature or humidity: Ensure that DIP switch 6 is
set properly. If DIP switch 6 is set to T1/T2 and a sensor has not been wired to the T1/T2
terminal, no temperature or humidity readings will be displayed. Also, if DIP switch 6 is
set to onboard and a remote sensor has been wired to the T1/T2 terminal, incorrect
temperature readings will be displayed. Check wires on remote sensors (flush mount or
outdoor/duct) to ensure that they are not touching. If they are, separate them.
Thermostat displays very low temperature: Remote sensor (flush mount or outdoor/
duct) is not connected to support module properly. Check wiring.
Thermostat doesn't display remote temperature/humidity: Make sure that the
support module is set to address 1. Reset support module after changing any DIP
switches by turning off power for approximately 15 seconds.
Thermostat displays RH instead of °F or °F instead of RH: Make sure that monitor/
control DIP switches are set correctly. Reset support module after changing any DIP
switches by turning off power for approximately 15 seconds.