Your new T32-VNP Atlas is a feature-rich thermostat that has been manufactured using the highest quality components and design currently available. When properly installed and configured by a professional heating and air conditioning contractor, the T32-VNP Atlas will provide years of dependable operation. The T32-VNP Atlas has been designed to be an attractive, highly reliable and easy-to-use thermostat. By taking time to read and understand this User Manual, you can take advantage of the many features offered in this premium product. Although great care has been taken in the preparation of this manual, iO HVAC Controls takes no responsibility for errors or omissions contained herein. It is the responsibility of the installer to ensure that this thermostat and the equipment connected to it operate in a safe and efficient manner. Due to ongoing product improvements, iO HVAC Controls reserves the right to change the specifications of the T32-VNP Atlas thermostat or its components without notice
As with any HVAC project, careful installation is the key to a successful outcome. Time taken during the installation process will be rewarded with fewer call-backs. The steps required to install the T32-VNP Atlas thermostat are as follows.
DISASSEMBLY
There are two release slots located on the bottom of the thermostat. Gently push the flat blade of a small screwdriver into one slot at a time and pry upward until the catch disengages. Carefully swing the thermostat upward and away from the sub base. (Figure 1)
THERMOSTAT LOCATION
The thermostat should be installed in a location that represents the ambient space temperature. Do not install the thermostat in an area where drafts are present, near the floor, behind doors or on an external wall. Avoid placing the thermostat in areas where the air movement is limited, affected by direct sunlight or other areas not typical of the temperature in the space.
MOUNTING THE SUB BASE
INSTALLING THE THERMOSTAT
| TERMINAL | DESIGNATION |
| C | 24 VAC Common |
| R | 24 VAC Hot |
| G | Fan |
| W1 | First Stage Heat/Auxiliary/Emergency Heat |
| W2/OB | Second Stage Heat or Reversing Valve |
| Y1 | First Stage Cool or First Stage Compressor |
| Y2 | Second Stage Cool or Second Stage Compressor |
| T (2) | Outdoor or Indoor Remote Sensor |
| AUX (2) | Relay Contacts for Fresh Air Ventilation Damper |
SETTING THE SYSTEM SWITCHES
SYSTEM SWITCH FUNCTIONS
INSTALLING THE BATTERIES
The thermostat comes with two AA batteries. Even if the thermostat is hardwired, battery backup is recommended. However, in the event batteries are not used and the thermostat loses primary power, all settings are nonvolatile. The battery access compartment is located on the front of the thermostat. Simply swing the hinged door down. Install the two AA batteries matching the + and – orientation. Close the door until it clicks shut. When the batteries are properly installed, the LCD screen will be visible. (Figure 4)
HEAT ONLY (GAS SINGLE OR MULTI-STAGE)
HEAT ONLY (ELECTRIC SINGLE OR MULTI-STAGE
COOL ONLY (ELECTRIC SINGLE OR MULTI-STAGE)
HEAT/COOL (GAS SINGLE OR MULTI-STAGE)
2 HEAT/1 COOL OR 3 HEAT/2 COOL (HEAT PUMP)
NOTE: Making changes in the Installer Setup Menu can seriously affect the safe operation and function of the HVAC equipment. If you are unsure about the functions of the settings it is strongly recommended that they are left at the factory default settings.
ENTERING THE MENU
NOTE: The Installer Setup Menu settings are dynamic which means that nonapplicable settings will not be displayed. For example, if the thermostat is configured for heat only, settings not pertaining the heat-only configuration will be hidden in the menu.
| MENU NUMBER | DESCRIPTION |
| 01 | Mode Selection (Factory Default = 0) 0 = Auto-changeover 1 = Manual Changeover 2 = Heating Only 3 = Cooling Only |
| 02 | Cooling Setpoint Limit (Factory Default = 50° F Cooling Limit can be adjusted from 43° F to 122° F |
| 03 | Heating Setpoint Limit Factory Default = 90° F Heating Limit can be adjusted from 41° F to 120° F |
| MENU NUMBER | DESCRIPTION |
| 04 | First Stage Differential (Factory Default = 1) 1 = 1° F 2 = 2° F 3 = 3° F |
| 05 | Second Stage Differential (Factory Default = 2) Adjustable from 1°F to 10°F in 1° increments |
| 06 | Third Stage Differential (Factory Default = 2) Adjustable from 1°F to 10°F in 1° increments |
| 07 | Demand or Locked Staging (Factory Default = 0 0 = Demand Staging – Thermostat will upstage and downstage based on differential settings 1 = Locked Staging – The thermostat will not be downstage until the call has been satisfied. |
| MENU NUMBER | DESCRIPTION |
| 08 | Internal Sensor Calibration (Factory Default = 0) Sensor Calibration can be adjusted from -9° F to +9° F |
| 09 | Compressor Protection (Factory Default = ON) ON = 4 minute delay on break time delay OFF = No delay on break |
| 10 | Low Balance Point (Factory Default = OFF) Low Balance Point can be used when the thermostat is configured for Heat Pump for Dual Fuel and fitted with an outdoor temperature sensor. When outdoor temperature drops below the Low Balance Point setting, the compressor is locked out and only auxiliary heat source is used for heating. Adjustable from 0° F to 77° F. |
| MENU NUMBER | DESCRIPTION |
| 11 | High Balance Point (Factory Default = OFF) High Balance Point can be used when the thermostat is configured for Heat Pump for Dual Fuel and fitted with an outdoor temperature sensor. When outdoor temperature rises above the High Balance Point setting, only the compressor is used and the auxiliary heat source is locked out. Adjustable from 32° F to 122° F. |
| 12 | Temperature Display (Factory Default = 0) 0 = Fahrenheit 1 = Celsius |
| 13 | Audible Button Beep (Factory Default = ON) ON = Audible Beep OFF = No Audible Beep |
| MENU NUMBER | DESCRIPTION |
| 14 | Fresh Air Ventilation (Factory Default = OFF) Fresh Air Ventilation is used to bring outside air into the conditioned space at a controlled CFM rate based on ASHRAE 62.2 – 2013 Ventilation and Indoor Air Quality Standard. See Ventilation Reference Chart to calculate ventilation minutes per hour. Fresh air damper is required which wires to the AUX terminals. Adjustable from 1-60 minutes in 1-minute increments. |
| 15 | FAV Low Temp Limit (Factory Default = OFF) FAV Low Temp is used to set an outdoor temperature when a remote outdoor sensor is installed and Fresh Air Ventilation is selected. If the outdoor temperature is equal to or lower than the selected setting, Fresh Air Ventilation will be suspended. Adjustable from 0° F to 50° F. |
| MENU NUMBER | DESCRIPTION |
| 16 | FAV High Temp Limit (Factory Default = OFF) FAV High Temp is used to set an outdoor temperature when a remote outdoor sensor is installed and Fresh Air Ventilation is selected. If the outdoor temperature is equal to or above the selected setting, Fresh Air Ventilation will be suspended. Adjustable from 60° F to 90° F. |
| 17 | Changing PIN (Factory Default = 21) PIN is used to access the Installer Menu. The range can be from 0 to 99. If PIN is changed, make sure it is documented. |
| 18 | Remote Sensor Selection (Factory Default = 0) 0 = Used with outdoor temperature sensor 1 = Replace internal sensor with indoor remote 2 = Use internal with indoor remote for temperature averaging |
| MENU NUMBER | DESCRIPTION |
| 19 | Factory Reset (Factory Default = 0) To reset the thermostat to the original factory defaults, change 0 to 1 and then exit the menu by pressing and holding down the Mode button for five seconds.
NOTE: This may change how the thermostat controls the HVAC equipment as well as any menu items that were changed from original factory defaults. |
This thermostat can use either a remote indoor or outdoor sensor but not both.
T-OTS REMOTE OUTDOOR TEMPERATURE SENSOR
The factory default in Installer Menu 18 = 0 which allows an outdoor remote sensor to be wired to the thermostat T and T terminals. The thermostat will display the outdoor temperature and can also be used for high and low balance point control as well as high and low-temperature limit control for Fresh Air Ventilation.
T-S1 REMOTE INDOOR TEMPERATURE SENSOR
TEMPERATURE/RESISTANCE CHART
FAN OPERATION
Press the button until the word is displayed. Press the button Mode OFF FAN until the word FAN On appears. After a moment, the internal fan relay ‘G’ will energize and the system fan should operate. Press the FAN button again until the word OFF appears. After a moment, the internal fan relay will de-energize and the system fan will shut off.
CONVENTIONAL HEATING
Press the Mode button until the word Heat appears. Press the UP arrow button and raise the setpoint above the space temperature and the first stage differential. After a moment, the internal heating relay ‘W1’ will energize and the heating system should operate. The word Heat will flash continuously. If the thermostat has been configured for two-stage heating, raise the setpoint above the second-stage differential and Heat will flash indicating the ‘W2’ heating relay is energized. Press the Mode button until the word OFF is displayed.
CONVENTIONAL COOLING
Press the Mode button until Cool appears. Press the DOWN arrow button and lower the setpoint below the space temperature and the first stage differential
Note: On a call for cooling, the thermostat activates a 4-minute time delay before the cooling relay ‘Y1’ is energized. The stage symbol will flash next to Cool to indicate the thermostat is in time delay. After the time delay, the internal fan ‘G’ and cooling relay ‘Y1’ will energize. The word Cool will flash. If the thermostat has been configured for two-stage cooling, lower the setpoint below the second-stage differential and Cool will flash indicating the ‘Y2’ cooling relay is energized. Press the Mode button until the word OFF is displayed.
CONVENTIONAL HEAT PUMP
When the thermostat is configured for conventional heat pump operation, testing is the same as a heating and cooling system with the exception that a 4-minute time delay is activated before the ‘Y1’ compressor relay will energize on a call for heating or cooling. The stage symbol will flash to indicate the thermostat is in time delay. Depending on the mode of operation and equipment configuration, Heat or Cool will flash when the ‘Y1’ compressor relay is energized. Heat or Cool will flash when the ‘Y2’ compressor relay is energized. Heat will flash when the auxiliary ‘W1’ relay is energized. E. Heat will flash when the mode is set to emergency heat. After testing, press the Mode button until the word OFF is displayed
DUAL FUEL
When the thermostat is configured for dual fuel operation, testing is the same as a heating and cooling system with the exception that a 4-minute time delay is activated before the ‘Y1’ compressor relay will energize on a call for heating or cooling. The stage symbol will flash to indicate the thermostat is in time delay. Depending on the mode of operation and equipment configuration, Heat or Cool will flash when the ‘Y1’ compressor relay is energized. Heat or Cool will flash when the ‘Y2’ compressor relay is energized. Heat and third stage symbol will flash when the auxiliary ‘W1’ relay is energized. E. Heat will flash when the mode is set to emergency heat. Whenever the thermostat calls for auxiliary heat, the heat pump compressor or compressors will be de-energized and the auxiliary heat will remain on until the call is satisfied.
LOW BALANCE POINT (Heat Pump or Dual Fuel)
When an outdoor sensor is used with the thermostat, Installer Menu 10 allows you to select a low balance point temperature. When the outdoor temperature falls below the low balance point setting, a call for heat from the thermostat automatically energizes the ‘W1’ relay and bypasses the compressor relays.
TESTING
To test the low balance point setting, set Installer Menu 10 above the displayed outdoor temperature and force a call for heating. Only the auxiliary heat relay ‘W1’ should energize. After testing, reset the low balance point setting to a normal operating range.
HIGH BALANCE POINT (Heat Pump or Dual Fuel)
High balance point is designed to prevent the auxiliary heat ‘W1’ relay from energizing when the outdoor temperature is above the balance point setting. To test the high balance point setting, set Installer Menu 11 below the displayed outdoor temperature and force a call for auxiliary heat. Only the compressor ‘Y1’ and/or ‘Y1’ and ‘Y2’ should energize. If the thermostat is placed in the (emergency heat) mode, the ‘W1’ relay E.Heat will energize. After testing, reset the high balance point setting to a normal operating range.
FRESH AIR VENTILATION
The auxiliary dry contacts can be used with the Fresh Air Ventilation option in Installer Menu 14. Fresh Air Ventilation is designed to improve residential indoor air quality by introducing fresh, outside air through a 2-wire, power-open / spring-closed motorized intake damper controlled by the thermostat. The thermostat controls the amount of fresh air required each hour based on ASHRAE 62.2 – 2013 Ventilation and Indoor Air Quality Standard.
FRESH AIR VENTILATION
The reference chart on the next page provides the ventilation timer setting based on using an 8” outside air damper ducted to the return air plenum on the HVAC system. A separate 24-volt transformer should be used to power the damper. When Fresh Air Ventilation is used FAV will appear on the LCD. When the fresh air damper is energized through the auxiliary contacts on the thermostat, FAV will flash
FRESH AIR VENTILATION DAMPER WIRING DIAGRAM
FRESH AIR VENTILATION SETUP
The reference chart below provides the ventilation timer setting (Installer Option 27) based on using 8” rigid straight duct with friction loss of 0.1” w.g. per 100 ft. This chart can be used for most applications.
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