WATTS IOM-T-564 tekmar Invita WiFi Thermostat Instruction Manual
Floor Sensor for Radiant Floor Heating
The thermostat can measure floor temperature between -46 to 212°F (-43 to 100°C). If a floor sensor
is connected, floor minimum and maximum settings are available. The floor heating setpoint is adjust-
able from 40 to 95°F (4.5 to 35°C).
For a combination of air and floor temperature control, leave the internal air sensor on in the setup
menu. A floor minimum can be used to prevent a fast drop in temperature caused by receding solar
exposure. This operation is recommended for areas heated by afternoon sun through large windows.
When the sun sets, it can take a long time for the floors to get warm again. This may cause the room
to cool off too much in the early evening. A floor minimum setting can help with this condition by main-
taining a floor minimum temperature. Keep in mind the floor minimum temperature will override the air
temperature, and if set too high, may overheat the room.
A floor maximum is recommended for rooms with hardwood floors. Setting floor minimum and
maximum temperatures is a way of enhancing the comfort of the living space while protecting
floor coverings.
If there are more than one floor temperature sensors, the temperature is averaged.
It’s possible to heat a radiant floor while the cooling system is operating. This is desirable in locations
such as kitchens and bathrooms. To use this feature, set the Warm Floor During Cooling on.
Cooling Differentials
The first and second stage cooling have adjustable differentials and time delay setting to determine
when the stage turns on, and shut off when the room temperature reaches 0.5 and 0.0°F (0.25 and
0.0°C) above the Cool To setting respectively.
Heat Pump Balance Point
An air source heat pump’s Coefficient of Performance (COP) declines with falling outdoor air tempera-
ture. The Balance Point is the outdoor temperature at which it is more economical to shut off the heat
pump (relays Y1 and Y2) and operate the backup heating equipment (relays W1 and W2).
Dual Fuel
Dual fuel systems include a heat pump together with a backup heat source such as a furnace or a
hydronic fan coil. When Dual Fuel is set to on, the heat pump (relays Y1 and Y2) is shut off whenever
the backup heating equipment (relays W1 and W2) is operating.
Warm Weather Shut Down (WWSD)
The heating system can automatically shut off based upon the outdoor temperature and the WWSD
setting. This provides a convenient way to shut off the heating system.
Cold Weather Shut Down (CWSD)
The cooling system can automatically shut off based upon the outdoor temperature and CWSD
setting. This prevents unwanted cooling during the winter.
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Relative Humidity Operation
Relative Humidity Sensor
The thermostat includes an internal relative humidity (RH) sensor and has the option to connect to an
external RH sensor. The installer has the option to disable the internal RH sensor when an external
RH sensor is installed. When both the internal and external RH sensors are enabled, the RH reading
is averaged.
Humidifier Operation
The thermostat controls the relative humidity (RH) by operating either the Accessory 1 or Accessory 2
relays. This is an installer configurable setting. When the RH is below the Humidify To setting by 3%,
the Accessory 1 or 2 relay is closed to operate a humidifier. The humidifier is shut off when the RH
reaches the Humidify To setting.
The thermostat can operate 3 types of humidifiers:
Stand Alone
- The humidifier is not connected to the HVAC system.
- The thermostat Mode can be set to Heat, Cool, Auto or Off.
Steam
- The steam humidifier is ducted to the HVAC system.
- The thermostat Mode can be set to Heat, Cool, Auto or Off.
- Requires the system fan to turn on when operating.
Evaporative
- A drum style humidifier which requires the heating system to operate
to evaporate the water.
- This system requires the system fan to operate.
- The thermostat Mode must be set to Heat or Auto.
Humidifier Window Protection
During cold weather, condensation will form on windows when the relative humidity (RH) is too high.
The optional window protection feature automatically calculates the indoor dew point based upon
the outdoor temperature and the quality of the windows installed. The humidifier is then operated to
the highest possible RH that is below the Humidify To setting. This feature requires that the outdoor
temperature be available (via sensor or internet).
Dehumidifier Operation
The thermostat controls the relative humidity (RH) by operating either the Accessory 1 or Accessory 2
relay. This is an installer configurable setting. When the RH is above the Dehumidify To setting by 3%,
the Accessory 1 or 2 relay is closed to operate the dehumidifier. The dehumidifier is shut off when the
RH reaches the Dehumidify To setting.
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Stand Alone
- The dehumidifier is not connected to the HVAC system.
- The thermostat Mode can be set to Heat, Cool, Auto or Off.
DX Coil
- The HVAC cooling system is used for dehumidification.
- The Accessory 1 or Accessory 2 relay activates the DHUM operation on the air
handling unit to operate the system fan at low speed.
- The cooling compressor Y1 and Y2 relays are operated. The chilled DX coil
condenses moisture from the air.
- The cooling system can over cool the room temperature by 2°F (1°C) during
dehumidification.
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| General | Details |
|---|---|
| Name | WATTS IOM-T-564 tekmar Invita WiFi Thermostat Instruction Manual |
| Make | WATTS |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.66 MB |
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