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Viega Multifunctional Thermostat User Guide
UG-HC 566441 1219 Multifunctional Thermostat (EN)
Technician Setup Steps
LCD will Show
Adjustment Options
Factory
Default
Settings
Gas Auxiliary for Heat Pump
This option will turn the heat pump
off 45 seconds after the auxiliary heat
relay turns on.
For 2 stage heat applications, the first
stage will turn off 45 seconds after the
auxiliary stage turns on.
For 3 stage heat applications, the first
and second stage will turn off 45 seconds
after the auxiliary stage turns on.
For heat pump systems
that are “dual fuel”
(use a gas furnace for
auxiliary stage heat) you
can turn this feature
on to turn off the heat
pump when the auxiliary
stage of heating has
been called for.
OFF
Stages of Heat
You can configure the thermostat to
operate a 3 stage heat pump system.
2H 2C = 2 heat, 2 cool
3H 2C = 3 heat, 2 cool
This feature only shows if Technician
Setup step for heat pump is set to ON.
Use the + or - key to
change between 2 heat
and 3 heat
2 heat will use Y1 as
first stage and W2 as
auxiliary.
3 heat will use Y1
as first stage, Y2 as
second stage and W2
as auxiliary.
2 Stages
Cooling Fan Delay
The cooling fan delay setting will delay
the fan from coming on in cool mode
and keep running after the compressor
shuts off for a short time to save
energy in some systems.
You can select the
Cooling Fan Delay from
OFF, 15, 30, 60 or 90
seconds.
OFF
IAQ Mode Cycle
This feature will configure the fan to run
a selected number of cycles “per hour”.
This mode can be enabled or disabled
at anytime during normal operation, by
selecting IAQ mode with the fan key.
Note: IAQ mode is a programmable/selectable
mode will operate the fan 1-4 cycles per hour,
1-45 minutes per cycle. Once programmed
in tech setup, to enable this mode select IAQ
with the fan key. Or you can disable the mode
by selecting ON or AUTO with the fan key.
Select OFF, 1, 2, 3 or 4
with the + or - keys.
This sets the number
of cycles per hour that
the IAQ fan mode will
operate.
OFF
IAQ Mode Minutes
This allows you to select the minimum
number of minutes that the fan will run
“per cycle”. The thermostat will keep
track of fan run time from normal Heat
and Cool operation. If additional fan
runtime is needed the thermostat will run
the fan to satisfy the IAQ mode minutes.
Select 1, 5, 10, 15, 20,
30 or 45 minutes.
When IAQ fan mode is
enabled, it will ensure
the fan runs at least the
selected number of minutes
per IAQ mode cycle.
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