Viconics VT7600 Installation Guide (First Release 1000 Series) - Manual (Page 9)

9
Programming and status display instructions
1. Status display
The thermostat features a two-line, eight-character display. There is a low level back-light level that is always active
and can only be seen at night. When left unattended, the thermostat has an auto scrolling display that shows the actual
status of the system. Each item is scrolled one by one with the back lighting off. Pressing any key will cause the back
light to come on.
Sequence of auto-scroll status display:
Room temperature Clock status System mode Schedule status
Outdoor
temperature
Alarms
RoomTemp Monday Sys mode Occupied Outdoor Service
x.x °C or °F 12.00 AM auto x.x °C or°F
Sys mode
off Occupied
hold
Frost ON
Sys mode
heat Unoccup
SetClock
Sys mode
cool Unoccup
hold
Filter
Sys mode emergenc
Override
Manual scroll of each menu item is achieved by pressing the Yes ( scroll ) key repetitively. The last item viewed will be
shown on the display for 30 seconds before returning to automatic scrolling. Temperature is automatically updated when
scrolling is held.
Outdoor air temperature display is only enabled when outdoor air temperature sensor is connected.
• A maximum range status display of 50 °C ( 122 °F ) indicates a shorted sensor. Associated functions, such as mode
lockouts and economizer function are automatically disabled.
• A minimum range status -40 °C ( -40 °F ) is not displayed and indicates a opened sensor or a sensor not connected.
Associated functions, such as mode lockouts and economizer function are automatically disabled.
If alarms are detected, they will automatically be displayed at the end of the status display scroll. During an alarm
message display, the back lit screen will light up at the same time as the message and shut off during the rest of the
status display. Two alarms maximum can appear at any given time. The priority for the alarms is as follows:
Frost ON
Indicates that the heating is energized by the low limit frost protection room temperature setpoint 5.6 °C ( 42 °F )
SetClock
Indicates that the clock needs to be reset. There has been a power failure which has lasted longer than 6 hours
Service
Indicates that there is a service alarm as per one of the programmable digital input ( DI1 or DI2 )
Filter
Indicates that the filters are dirty as per one of the programmable digital input ( DI1 or DI2 )
Three status LEDs on the thermostat cover are used to indicate the status of the fan, a call for heat, or a call for cooling.
Multistage and single stage models
•
When the fan is on, the FAN LED will illuminate.
• When heating is on, the HEAT LED will illuminate.
• When cooling is on, the COOL LED will illuminate.
Fig.11 - Multistage and single stage models
Heat pump models
•
When the fan is on, the FAN LED will illuminate.
• When auxiliary heat is on, the AUX HEAT LED
will illuminate.
• When compressor is on, the HEAT-PUMP LED
will illuminate.
Fig.12 – Heat pump models