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Specified Controls Atlas Vertical SC-T32-VNP Installation Manual

Non-programmable thermostat
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SC-T32-VNP Atlas Vertical
Non-programmable Thermostat
Installation Manual

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Summary of Contents for Specified Controls Atlas Vertical SC-T32-VNP

  • Page 1 SC-T32-VNP Atlas Vertical Non-programmable Thermostat Installation Manual...
  • Page 2 (BLANK)

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Introduction ..........................4 Getting Started........................5 Installing the Thermostat ....................6-7 Disassembly ......................6 Thermostat Location ....................6 Mounting the Subbase..................6-7 Terminal Designations....................8 Setting the System Switches ....................9 System Switch Functions......................10 Installing the Batteries ......................11 Typical System Wiring Diagrams..................12-17 Heat only (Gas Single or Multi-stage)..............12 Heat only (Electric Single or Multi-stage)..............13 Cool only (Single or Multi-stage) ................14 Heat / Cool (Gas Single or Multi-stage)..............15...
  • Page 4 TABLE OF CONTENTS Installer Setup Menu ......................18-25 Entering the Setup Menu..................18 Selecting Mode....................19 Selecting the Cooling Setpoint Limit..............19 Selecting the Heating Setpoint Limit..............19 Selecting First Stage Differential .................20 Selecting Second Stage Differential ..............20 Selecting Third Stage Differential ...............20 Selecting Demand Staging or Locked Staging ...........20 Internal Sensor Calibration .................21 Compressor Protection ..................21 Selecting Low Balance Point Option..............21...
  • Page 5 TABLE OF CONTENTS Remote Sensor Installation ....................26-27 T-OTS Outdoor Sensor Installation...............26 T-S1 Indoor Sensor Installation................26 Temperature/Resistance Chart ................27 Display Functions........................28 Testing..........................29-32 Fan Operation.......................29 Conventional Heating...................29 Conventional Cooling..................29-30 Conventional Heat Pump..................30 Dual Fuel......................31 Low Balance Point...................31-32 High Balance Point....................32 Fresh Air...........................32-34 Specifications........................35...

  • Page 6: Introduction

    Due to ongoing product improvements, Specified Controls reserves the right to change the specifications of the SC-T32-VNP Atlas thermostat or its components without notice.

  • Page 7: Getting Started

    GETTING STARTED 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 SC-T32-VNP Atlas thermostat are as follows. 1.

  • Page 8: Installing The Thermostat

    INSTALLING THE THERMOSTAT 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 subbase. (Figure 1) THERMOSTAT LOCATION The thermostat should be installed in a location that represents the ambient space temperature.
  • Page 9 INSTALLING THE THERMOSTAT Pull the control wires through the large opening in the thermostat subbase. Next, level and mount the subbase on the wall using the supplied anchors and screws. (Figure 2) Do not over tighten the mounting screws as the subbase may warp causing the improper seating of the thermostat connecting pins to the terminal Wire Access...

  • Page 10: Terminal Designations

    INSTALLING THE THERMOSTAT TERMINAL DESIGNATION 24 VAC Common 24 VAC Hot First Stage Heat/Auxiliary/Emergency Heat W2/OB Second Stage Heat or Reversing Valve First Stage Cool or First Stage Compressor Second Stage Cool or Second Stage Compressor T (2) Outdoor or Indoor Remote Sensor AUX (2) Relay Contacts for Fresh Air Ventilation Damper...

  • Page 11: Setting The System Switches

    SETTING THE SYSTEM SWITCHES ON DIP 1 2 3 4 The thermostat contains a set of four system switches located on the thermostat printed circuit board. (Figure 3) SYSTEM SWITCHES The switches are used to match the thermostat operation and relay outputs with the HVAC system requirements.

  • Page 12: System Switch Functions

    SYSTEM SWITCH FUNCTIONS Switch 1 - Equipment Type Switch 1 sets the equipment type. For conventional heat/cool equipment, set the switch to the OFF position (factory default). For heat pump equipment set the switch to the ON position. Switch 2 - Fan or When Switch 1 is OFF Reversing Valve For gas heat, set the switch to the OFF position...

  • Page 13: Installing The Batteries

    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 non- volatile. The battery access compartment is located on the front of the thermostat.

  • Page 14: Typical System Wiring Diagrams

    TYPICAL SYSTEM WIRING DIAGRAMS HEAT ONLY (GAS SINGLE OR MULTI-STAGE) REMOTE INDOOR OR OUTDOOR SENSOR THERMOSTAT EQUIPMENT HEAT 1 HEAT 2 RELAY RELAY RELAY LINE 24 V Switch Settings Switch 1 = Heat/Cool Switch 2 = Equipment controls fan on call for heat Switch 3 = Single Stage = Two Stage...

  • Page 15: Heat Only (Electric Single Or Multi-Stage)

    TYPICAL SYSTEM WIRING DIAGRAMS HEAT ONLY (ELECTRIC SINGLE OR MULTI-STAGE) REMOTE INDOOR OR OUTDOOR SENSOR THERMOSTAT EQUIPMENT HEAT 1 HEAT 2 RELAY RELAY RELAY LINE 24 V Switch Settings Switch 1 = Heat/Cool Switch 2 = Thermostat controls fan on call for heat Switch 3 = OFF/ON = Single Stage...

  • Page 16: Cool Only (Single Or Multi-Stage)

    TYPICAL SYSTEM WIRING DIAGRAMS COOL ONLY (ELECTRIC SINGLE OR MULTI-STAGE) REMOTE INDOOR OR OUTDOOR SENSOR THERMOSTAT EQUIPMENT COOL1 COOL 2 RELAY RELAY RELAY LINE 24 V Switch Settings Switch 1 = Heat/Cool Switch 2 = Fan energized on call for cooling Switch 3 = OFF/ON = Single Stage...

  • Page 17: Heat/Cool (Gas Single Or Multi-Stage)

    TYPICAL SYSTEM WIRING DIAGRAMS HEAT/COOL (GAS SINGLE OR MULTI-STAGE) REMOTE INDOOR OR OUTDOOR SENSOR THERMOSTAT EQUIPMENT HEAT 1 HEAT 2 COOL1 COOL 2 RELAY RELAY RELAY RELAY RELAY LINE 24 V Switch Settings Switch 1 = Heat/Cool Switch 2 = Fan energized on call for cooling Switch 3 = OFF/ON...

  • Page 18: Heat/1 Cool Or 3 Heat/2 Cool (Heat Pump)

    TYPICAL SYSTEM WIRING DIAGRAMS 2 HEAT/1 COOL OR 3 HEAT/2 COOL (HEAT PUMP) REMOTE INDOOR OR OUTDOOR SENSOR THERMOSTAT EQUIPMENT R VALVE COMP 1 COMP 2 RELAY RELAY RELAY RELAY RELAY LINE 24 V Switch Settings Switch 1 = ON Heat Pump Switch 2 = OFF ON...

  • Page 19: Heat/1 Cool Or 3 Heat/2 Cool (Dual Fuel)

    TYPICAL SYSTEM WIRING DIAGRAMS 2 HEAT/1 COOL OR 3 HEAT/2 COOL (DUAL FUEL) REMOTE INDOOR OR OUTDOOR SENSOR THERMOSTAT EQUIPMENT R VALVE COMP 1 COMP 2 RELAY RELAY RELAY RELAY RELAY LINE 24 V Switch Settings Switch 1 = ON Heat Pump Switch 2 = OFF ON...

  • Page 20: Installer Setup Menu

    INSTALLER SETUP MENU 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.

  • Page 21: Selecting Mode

    INSTALLER SETUP MENU NOTE: The Installer Setup Menu settings are dynamic which means that non- applicable 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.

  • Page 22: Selecting First Stage Differential

    INSTALLER SETUP MENU MENU NUMBER DESCRIPTION First Stage Differential (Factory Default = 1) 1 = 1° F 2 = 2° F 3 = 3° F Second Stage Differential (Factory Default = 2) Adjustable from 1°F to 10°F in 1° increments Third Stage Differential (Factory Default = 2) Adjustable from 1°F to 10°F in 1°...

  • Page 23: Internal Sensor Calibration

    INSTALLER SETUP MENU MENU NUMBER DESCRIPTION Internal Sensor Calibration (Factory Default = 0) Sensor Calibration can be adjusted from -9° F to +9° F Compressor Protection (Factory Default = ON) ON = 4 minute delay on break time delay OFF = No delay on break Low Balance Point (Factory Default = OFF) Low Balance Point can be used when the thermostat is configured for Heat Pump for Dual...

  • Page 24: Selecting High Balance Point Option

    INSTALLER SETUP MENU MENU NUMBER DESCRIPTION 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.

  • Page 25: Selecting Fresh Air Ventilation

    INSTALLER SETUP MENU MENU NUMBER DESCRIPTION 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.
  • Page 26 INSTALLER SETUP MENU MENU NUMBER DESCRIPTION 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.
  • Page 27 INSTALLER SETUP MENU MENU NUMBER DESCRIPTION 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...

  • Page 28: Remote Sensor Installation

    REMOTE SENSOR INSTALLATION This thermostat can use either a remote indoor or outdoor sensor but not both. SC-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 terminals.

  • Page 29: Temperature/Resistance Chart

    REMOTE SENSOR INSTALLATION Remote sensors used with this thermostat are NTC Type 2 - 10 @ 77 Ω ° F...

  • Page 30: Display Functions

    DISPLAY FUNCTIONS Displayed when thermostat Low battery indication is in Installer Mode (Change batteries) Displays heating and/or cooling setpoint as well as outdoor temperature when optional outdoor remote sensor is used Displayed when Fresh Air Displays room Ventilation is being used temperature and flashes when fresh air damper is open...

  • Page 31: Testing

    TESTING FAN OPERATION Press the Mode button until the word is displayed. Press the button until the word FAN On appears. After a moment, the internal fan relay ‘G’ will energize and the system fan should operate. Press the button again until the word appears.

  • Page 32: Conventional Heat Pump

    TESTING 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.

  • Page 33: Dual Fuel

    TESTING 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.

  • Page 34: High Balance Point

    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’...
  • Page 35 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.
  • Page 36 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.

  • Page 37: Specifications

    SPECIFICATIONS Input Voltage (Hardwired) 20-30 VAC 50/60 Hz Relay Rating 24 VAC @ 1 Amp maximum per relay Battery Power (2) AA 1.5 V Operating Temperature 32° F to 150° F Operating Relative Humidity 0-95% RH (non-condensing) Storage Temperature 32° F to 150° F Overall Size 3.375”...
  • Page 38 SC-06-1358-110122...

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