10
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
Fan lock
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 )
Fan lock
Indicates that the heating and cooling action are locked out due to a defective fan operation
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.
LED operation Heatpump models VT76xxH Multistage and single stage models
VT7600A, VT7652A, VT7600B & VT7652B
Multistage economizer models
VT7605B & VT7656B
Fan LED on When G Fan terminal operates When G Fan terminal operates When G Fan terminal operates
Heating LED
on
When Y1 and / or W1 terminal(s) operate in
heating mode
When W1 terminal operate in heating mode When W1 terminal operate in heating mode
Cooling LED
on
When Y1 terminal operate in cooling mode When Y1 terminal operate in cooling mode When Y1 terminal operate in cooling mode
and or economizer output is in function
Fig.11 – Heatpump, multistage and single stage models
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