VENSTAR FAN COIL THERMOSTAT T1070 FAN COIL THERMOSTAT NONPROGRAMMABLE 2 OR 4 PIPE SYSTEMS Remote sensor ready 3 speed fan control Self-prompting adjustment Auto 2-pipe changeover when used with ACC-SENFC changeover sensor Dry contact equipped Backlit display Works with most fan coil systems - 24vac Electric heat ready Non-volatile memory Dual setpoint with adjustable deadband Keypad lockout Configurable display Display F or C OWNER’S MANUAL AND INSTALLATION INSTRUCTIONS
Table Of Contents FRONT PANEL 2 DISPLAY 3 SELECTING THE HEAT OR COOL MODE 5 BASIC OPERATION 9 ADVANCED SETUP 10 ADVANCED SETUP TABLE 15 ABOUT ADVANCED FEATURES & OPERATION 16 SAMPLE WIRING DIAGRAMS 25 WARRANTY 29 CAUTION Disconnect Power to the Heater/Air Conditioner before removing the old thermostat and installing the new thermostat.
Front Panel 1 72 Mode 74 COOL AUTO 70 HEAT 2 Fan 3 4 5 1 Liquid Crystal Display 2 Up/Down Buttons 3 Mode Button 4 Fan Button 5 Heat or Cool Indicator Heat = Red, Cool = Green Page 2
Display 4 3 1 unoccupied 2 OUTSIDE 1 1 3 1 Mode Indicators - Page 5-8 Selects the operational mode of the equipment. HEAT - Indicates the heating mode. COOL - Indicates the cooling mode. AUTO - Indicates the system will automatically changeover between heat and cool modes as the temperature varies. OFF - Indicates heating and cooling are turned off. 2 Room Temperature Display Indicates current room temperature. 3 Desired Set Temperature - Page 9 Indicates desired room temperature(s).
Display 8 unoccupied 6 OUTSIDE 7 5 5 Fan icon - Page 9 Indicates fan operation. Fan = low speed Fan = medium speed Fan = high speed When only the Fan icon is displayed, the fan is in the Auto mode and will run only when necessary to heat or cool. 6 Locked icon - Page 21 Indicates keypad has been locked. 7 Outside icon - Page 22 Indicates the temperature displayed is from the optional outside sensor. 8 Unoccupied icons - Pages 13-14 Indicates a dry contact forced Unoccupied time period is in effect.
Selecting the Heat or Cool Mode 4-Pipe Operation Select Mode by Pressing the MODE Button Heating Only The HEAT setting indicates the temperature the room has to reach before the heating source will turn on to heat the room. Cooling Only The COOL setting indicates the temperature the room has to reach before the cooling source will turn on to cool the room. Heating or Cooling AUTO will automatically select heat or cool based on room temperature demand.
Selecting the Heat or Cool Mode 2-Pipe Operation Heat Only Step #4 = 1 in the Advanced Setup section, page 11. Heating Only The HEAT setting indicates the temperature the room has to reach before the heating source will turn on to heat the room. 70 68 HEAT Press Off OFF indicates both heating and cooling are turned off.
Selecting the Heat or Cool Mode 2-Pipe Operation Cool Only Step #4 = 2 in the Advanced Setup section, page 11. Cooling Only The COOL setting indicates the temperature the room has to reach before the cooling source will turn on to cool the room. 70 76 COOL Press MODE Off OFF indicates both heating and cooling are turned off.
Selecting the Heat or Cool Mode 2-Pipe Operation Heating and/or Cooling Step #4 = 3 in Advanced Setup (page 11), and the accessory changeover sensor (ACC-SENFC) is used. If step #4 = 4 or 5 in Advanced Setup (page 11). Operation is the same as a 4-pipe system (page 5). HEAT indicates the temperature the room has to reach before the heating source energizes. If the water supply is cold, this screen and heating would be locked out.
Basic Operation Selecting Your Desired Temperature (adjusting the setpoints) AUTO OR PROGRAM MODE Pressing the UP or DOWN button in Auto or Program mode will adjust both the heat and cool set temperatures simultaneously. Adjust the desired set temperature with the 70 76 COOL AUTO 68 HEAT buttons. Press Fan Operation FAN Pressing the FAN button will run the fan in low, medium, or high speed continuously (see below and page 20).
Advanced Setup MODE FAN Press the MODE and FAN buttons at the same time for 10 seconds to enter Advanced Setup screens. NOTE: Each step # is located at the top right corner of the display for easy reference. I Display On Select Display operation: On = Full Display Off = Minimal display See Page 20 Display Off Setup ON Press 2 Select Display operation: 1 = Single Setpoint 2 = Dual Setpoint See Page 24 Note: When Single Setpoint is selected, the heating or cooling setpoint will always be displayed.
Advanced Setup 4 2 Select fan coil system type: 2 = 2-pipe fan coil 4 = 4-pipe fan coil 4 Setup Step #4 only appears if step #3 = 2. 2-PIPE SYSTEM OPERATION 1= Heat only system 2= Cool only system 3= Heat/Cool Auto changeover 4= Heat/Cool Aux Electric heat, Lockout Electric Heat when Hot Water is available 5= Heat/Cool total electric heat, no Hot Water, only Electric Heat.
Advanced Setup Select Fan Coil Type On Off 6 On = Carrier or IEC fan coil using a 33ZCRLYBRD relay board. Off = Conventional 3 speed fan coil system. Press MODE See Page 24 for further explanation of Fan Coil Type. Adjust the deadband for the 1st stage. (1 - 6 ) See Page 17 2 Setup 7 Press Step #7 will not appear if step #4 = 1 or 2. Adjust the minimum difference between cooling & heating setpoints.
Advanced Setup C Setup I0 Select thermostat operation in degrees Fahrenheit or Celsius.
Advanced Setup I3 Unoccupied Setpoints Setup Select Dry Contact Unoccupied operation: Unoccupied = when the Dry Contact is closed, Off the thermostat will control to the Unoccupied setpoints. Off = when the Dry Contact is closed, the thermostat will be forced into the Off mode. 8555 unoccupied Adjust the cooling setpoint for unoccupied periods. (35 - 99, OF ) Adjust the heating setpoint for Unoccupied periods.
Advanced Setup Advanced Setups - Table Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Range Description Display Declutter Single or Dual Setpoint 2 or 4 Pipe System 2 Pipe System Operation Fan Auto Operation Fan Coil Type Operation 1st Stage Deadband Heat Cool Differential Backlight Degrees F or C Sensor Operation Dry Contact Polarity Dry Contact Operation Unocc. Cool Setpoint Unocc. Heat Setpoint On / Off Single / Dual 2/4 5 Choices On / Off On / Off 1-6 0-6 On / Off F/C Yes / No NO / NC Unocc.
About Advanced Features & Operation CALIBRATION - Under normal circumstances it will not be necessary to adjust the calibration of the temperature sensor. 1 MODE Place the thermostat in the OFF mode. 2 Press and hold the MODE button. MODE While holding the MODE button, press and hold the DOWN button for 5 seconds. All icons will appear on the display. 3 Software Version # 72 88 Setup unoccupied 88 COOL Locked Override AUTO OUTSIDE 88 HEAT 500 Press the MODE button once.
About Advanced Features & Operation DEADBAND OPERATION - Controls one Heat and one Cool stage with a three speed fan (see below). The low speed fan for heat or cool is turned on when: The temperature spread from the setpoint is equal to or greater than: the setpoint plus the 1st stage deadband (step #7, page 12). This 1st stage deadband is adjustable from 1-6 degrees and the default is two degrees.
About Advanced Features & Operation DRY CONTACT SWITCH - This feature allows an external device such as a Central Time Clock, Occupancy Sensor, or a Telephone activated device to force one or more thermostats into an Unoccupied mode (steps #12 and 13, page 13 & 14). When the CK1 and R terminals are shorted together, and the thermostat is programmed for Unoccupied operation (step #13, page 14), the thermostat will be forced into Unoccupied setpoints and the Unoccupied icon will appear on the display.
About Advanced Features & Operation FACTORY DEFAULTS - If, for any reason, you desire to return all the stored settings back to the factory default settings, follow the instructions below. WARNING: This will reset all Advanced Programming to the default settings. Any information entered prior to this reset will be permanently lost. 1 MODE Place the thermostat in the OFF mode. 2 Press and hold the MODE button. MODE While holding the MODE button, press and hold the DOWN button for 5 seconds.
About Advanced Features & Operation FAN OPERATION Fan: When only the fan icon is displayed, this indicates that the fan is in the Auto mode, will only energize during a heating or cooling cycle, and will modulate fan speeds based on temperature demand (see page 17). Fan , Fan , or Fan : Pressing the FAN button will cause the low, medium, or high speed fan icon to appear (see page 9), indicating that the fan will run continuously.
About Advanced Features & Operation HEAT/COOL DIFFERENTIAL - The Heat and Cool setpoints will not be allowed to come any closer to each other than the value set in Advanced Setup step #8, on page 12. This minimum difference is enforced during Auto-changeover operation. Note: To increase the spread between the heating and cooling setpoints in the Auto-changeover mode press the MODE button until only the heat setpoint is displayed; adjust to the desired setpoint.
About Advanced Features & Operation LOCKING COVER w/Tamper Proof Screws 72 Mode 74 72 COOL AUTO 70 HEAT 74 COOL AUTO 70 HEAT Fan OUTSIDE SENSOR - To view an Outside Sensor press and hold the FAN button for two seconds until the Outside icon appears. If an optional outside sensor is connected, the outside temperature will appear on the display. To exit the outside temperature display, press any button.
About Advanced Features & Operation DUCT SENSOR (P/N ACC0402) - The thermostat is programmed from the factory to automatically recognize when a Duct Sensor is connected (step #11, page 13). Digital Sensor High Temp. Heat Shrink Tubing 5’ Plenum Rated Cable White Black Duct Sensor connections are illustrated on page 27. Note: If a Duct sensor is connected to this thermostat, then the fan should be programmed for continuous operation (step #5, page 11).
About Advanced Features & Operation SINGLE SETPOINT BEHAVIOR - When configured for Single Setpoint operation (step #2, page 10), the degree icon will blink when the large number is displaying room temperature and will remain solid when displaying the heating or cooling setpoint. In the Auto mode the deadband is enforced both above and below the setpoint. To avoid short cycling, a deadband of at least two degrees is recommended (step #7, page 12).
Sample Wiring Diagram 2-Pipe, Low Voltage Valve, H2O Changeover Sensor Thermostat If 2-pipe with auxiliary electric heat R G Y1 R G3 W1 G2 EH C H2O V C 24vac 24 Volt Water Valve C R Generic Relay Board GG G2/(W) G2 G3/(Y) G3 COM COM L M H LO (L1) L1 (N/A) HI (HI) MED (MED) H2O Changeover Sensor ACC-SENFC Page 25 LO
Sample Wiring Diagram 4-Pipe, Low Voltage Valves, Duct Temperature Sensor & Dry Contact Duct Sensor ACC0402 Important Note: If a Duct sensor is connected to this thermostat it is suggested that the fan be programmed for continuous operation (step #5, page 11 of the Owner’s Manual). RS RS GND Thermostat Connect directly to R terminal on backplate.
Sample Wiring Diagram Connection Diagram for Duct Sensor to T1070 Fan Coil Thermostat Digital Sensor High Temp. Heat Shrink Tubing 5’ Plenum Rated Cable White Black RS R G Y1 G3 W1 G2 C Note: It is important to connect the black wire from the Duct Sensor directly to the R terminal on the thermostat backplate.
Sample Time Clock Wiring Diagram Important Information About: Auxiliary Input Control and Multiple HVAC Control Potential Phasing Problems CAUTION WARNING When using the auxiliary input (CK1 & R) or controlling multiple HVAC units with a single thermostat, it is possible to encounter transformer phasing problems that will interfere with thermostat operation. Connecting transformers that are not phased correctly may result in a direct short, which could damage transformers and/or the thermostat.
Warranty One-Year Warranty - This Product is warranted to be free from defects in material and workmanship.