iO HVAC CONTROLS Z-2000-T Thermostat Instruction Manual

: August 9, 2024
: iO HVAC Controls

Table of Contents

iO HVAC CONTROLS Z-2000-T Thermostat
Product Usage Instructions
Frequently Asked Questions
Terminal Designations
System Wiring Diagrams
Removing the thermostat subbase
Mounting The Thermostat Subbase
Switch Functions
Key Functions
Setup
Checking Thermostat Status
Thermostat Operation
Specifications
Read User Manual Online (PDF format)
Download This Manual (PDF format)

iO HVAC CONTROLS Z-2000-T Thermostat

Specifications

Model: Z-2000-T
Designed to work with Z-2000 modulating zone control system and
Zone One stand-alone modulating zone damper and diffuser
Auto Changeover Space Thermostat
Power Input: 24VAC
Includes various connections for damper, heat, cool, power, and duct sensor

Product Usage Instructions

Installation

Review the installation manual thoroughly before starting.
Ensure the Z-2000-T thermostat is compatible with the Z-2000 system and Zone One damper.
Follow the wiring diagram provided to connect the thermostat to the relevant components.
Mount the thermostat properly on the wall at an appropriate height for easy access.

Operation

Power on the system and set the desired temperature using the thermostat controls.
The thermostat will automatically switch between heating and cooling modes based on the temperature settings.
Monitor the system for proper functioning and adjust settings as needed.

Frequently Asked Questions

Q: Can the Z-2000-T thermostat be used with other HVAC systems?

A: The Z-2000-T thermostat is specifically designed to work with the Z-2000 system and Zone One damper. It is recommended to use it with these compatible components for optimal performance.

Q: What should I do if the thermostat is not displaying the correct temperature?

A: Check the wiring connections and ensure they are properly connected. If the issue persists, contact technical support for further assistance.

Q: How do I calibrate the temperature settings on the Z-2000-T thermostat?

A: The Z-2000-T thermostat comes pre-calibrated, but if you need to adjust the temperature settings, refer to the user manual for detailed instructions on calibration.

The Z-2000-T thermostat is designed to work with the Z-2000 modulating zone control system and the Zone One stand-alone modulating zone damper and diffuser. Please take time to read and understand this manual so that installation and testing are undertaken efficiently and effectively.
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 safely and efficiently.

Due to ongoing product improvements, iO HVAC Controls reserves the right to change the specifications of the Z-2000-T or its components without notice.

Terminal Designations

Thermostat Subbase

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $1$$

The thermostat has dedicated screw terminals located on the subbase to facilitate ease of wiring to the actuator board mounted on the damper of the diffuser. When wiring the thermostat to the actuator board, use standard 18-8 thermostat wire (verify with local codes if plenum-rated wire is required).

System Wiring Diagrams

Typical Stand-alone Zone Damper or Diffuser

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $2$$

Typical Zone Control System

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $3$$

Removing the thermostat subbase

Removing the thermostat from the subbase

The thermostat contains a release slot located on the bottom. Insert a small coin (dime) in the release slot and gently twist the coin to release the thermostat from the subbase. Avoid twisting the case, as this may stress the LCD or bend the terminal connector pins.
The top of the thermostat is hinged to the subbase and will release when rotated upward.
When attaching the thermostat to the subbase, first place the hinged access cover on by fitting the plastic molded pins into the grooves at the top of the thermostat. Carefully align the two standoffs located at the top of the thermostat with the slots in the top of the subbase. Allow the thermostat to swing downward and gently push until the connector pins are fully seated into the terminal blocks.

Mounting The Thermostat Subbase

The thermostat should be installed in a location that represents the ambient room 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 of the room.
When mounting the thermostat, be aware that drafts may travel down cavity walls and enter the back of the thermostat through the control wire holes in the wall. It is important to seal these holes to prevent any drafts from affecting the internal temperature sensor.
Pull the control wires through the large opening in the thermostat subbase then level and mount the subbase on the wall using the supplied anchors and screws. Do not over-tighten the mounting screws as the subbase may warp causing improper seating of the thermostat connecting pins to the terminal blocks. Use a properly sized screwdriver and land each wire to its dedicated terminal. Check to see that all wires are landed correctly and dressed properly to prevent any shorts.

Switch Functions

(A) SWITCH 1 is used to lock the thermostat. When the thermostat is locked (ON position) a padlock icon will show on the LCD. When locked, only setpoint changes and status functions can be accessed by the user. Do not set Switch 1 in the ON position until all SETUP functions are completed.
(A) SWITCH 2 displays the space temperature and setpoint in Fahrenheit (OFF position -factory default) or Celsius (ON position. Select For C before proceeding to the SETUP menu.
(A) SWITCH 3 is used to select fully modulating (OFF position – factory default) or two-position (ON position) damper control to best suit the specific application requirement.
(A) SWITCH 4 & 5 have no function.
(A) SWITCH 6 Switch 6 is used to display or hide the Heat and Cool on the LCD. The OFF position displays Heat and Cool. ON position hides Heat and Cool.
(A) SWITCH 7 When switch 7 is OFF, both the space temperature and set temperature are displayed. When switch 7 is ON, only the set temperature is displayed.
(A) SWITCH 8 has no function.
(B) SWITCH 1
Switch 1 should remain OFF for Modbus. It is only used as an end-of-the-line resistor on a large network where communications issues might exist. Consult the factory for additional information.
(B) SWITCH 2 & 3
When the internal sensor is used, Switch 2 is ON, and Switch 3 is OFF. When a remote sensor is used, Switch 2 is OFF and Switch 3 is ON.

Key Functions

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $7$$

ON/OFF KEY -When the thermostat is not locked, this key allows the thermostat to be turned ON and OFF. When in the OFF position, the damper is also driven closed.
STATUS KEY -Pressing the STATUS key displays the UNIT number, ZONE number, DUCT temperature, and DAMPER position.
UP( ) and DOWN ( ) KEYS -These keys are used to increase or decrease the setpoint as well as change thermostat setup values.
SETUP KEY -This key allows the installer to toggle through the thermostat setup menu.
ENTER KEY -This key is used to enter changes as well as exit the setup menu.

Setup

Startup
Replace the thermostat on the subbase and apply 24 Volts of power. The LCD will momentarily display all icons. (Figure 1)

Entering the setup menu
Press and hold the SETUP key until the word DAMPER appears on the LCD. (Figure 2)

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $9$$

Setting the minimum damper position
Press the SETUP key again and the LCD will display the minimum damper position. The factory default is 10°/o which means the damper is driven 90% closed. Press the ( ) and ( ) keys to change the minimum damper position. Position may be adjusted in 10% increments. (Figure 3)

Setting the maximum damper position
Press the SETUP key again and the LCD will display the maximum damper position for heating and cooling. The factory default is 100% which means the damper can drive fully open. Press the ( ) and ( ) keys to change the maximum damper position. Position may be adjusted in 10°/o increments. (Figure 4)

Helpful Hint:
The maximum damper position setting can help with air balancing when no manual balancing dampers have been installed.

Setting a unit number
Press the SETUP key again and the LCD will display the word UNIT. The factory default is 00. This number can be used to assign the thermostat to a particular HVAC unit. Use the (.&) or (T) key to assign a UNIT number from 00 to 99. (Figure 5)

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $14$$

Setting a zone number
Press the SETUP key again and the LCD will display the word ZONE. The factory default is 00. This number can be used to identify each thermostat wired to a zone control panel or when used in multiple stand-along applications. Use the( ) and ( ) keys to assign a ZONE number from 00 to 99. (Figure 6)

If you choose not to change the unit and zone number defaults, it will not affect the thermostat.

Helpful Hint:
If it is necessary to exit the setup menu before all setup functions are completed, simply press the ENTER key and all settings will be saved. To re- enter the setup menu, press and hold the SETUP key until the word DAMPER appears, and then continue pressing the SETUP key to toggle through the functions to where you left off.

Setting the heating limit
Press the SETUP key again and the LCD will display the heating limit. The factory default is 76° F. Press the ( )and( ) keys to change the heating limit setting. It is strongly recommended that the limit not be set above the factory default setting. (Figure 7)

Setting the cooling limit
Press the SETUP key again and the LCD will display the cooling limit. The factory default is 68 ° F. Press the ( ) and ( ) keys to change the cooling limit setting. It is strongly recommended that the limit not be set below the factory default setting. (Figure 8)

Setting the actuator speed
Press the SETUP key again and the LCD will display the actuator speed. The factory default is 90 seconds which is the time it takes the actuator to drive the damper blade fully open or fully closed. This is a critical step in setup since the thermostat can be used with a variety of 24 Volt actuators. If you are unsure of the actuator speed, place the actuator in the fully closed position and then apply 24 Volts to common and power open. The time it takes to drive the damper blade fully open equals the actuator speed setting. (Figure 9)

Setting the Modbus address

Press the SETUP key again and the LCD will display the Modbus address. The factory default is 01.
The thermostat has integrated Modbus communication capabilities for remote monitoring and control. For more information, contact the factory. (Figure 10)

Temperature calibration offset
Press the SETUP key again and the LCD will display the temperature calibration offset. The factory default setting is 0. Typically, it is not necessary to adjust the temperature calibration offset as the thermostat has been factory- calibrated. If calibration is necessary, a high-quality electronic digital thermometer must be used. Place the thermometer sensor probe next to the thermostat sensor and allow five minutes before comparing the temperature readings. Use the ( ) and ( ) keys to adjust the temperature calibration. The range is +/- 9° F. (Figure 11)

Saving settings and exiting the setup menu
Press the ENTER key and the thermostat will save the setup menu settings and exit the program. The LCD will display the space temperature along with other normal operating functions. To review the thermostat settings, simply press and hold the SETUP key until the setup menu is displayed, and then toggle through the settings. Press the ENTER key to exit the setup menu. Remove the thermostat from the subbase and set the Switch 1 in the ON position to lock the thermostat which will prevent setup changes from being made. When the thermostat is locked, a padlock icon will be displayed on the LCD. (Figure 12)

Checking Thermostat Status

After the thermostat is locked and operational, its status functions can be checked by pressing the STATUS key and toggling through the following status points:

UNIT – Displays the HVAC unit number assigned to the thermostat
ZONE – Displays the thermostat zone number
DUCT – Displays the duct temperature
POSITION – Displays the damper position in 10-degree increments. (0% = fully closed and 100% = fully open)

Thermostat Operation

The thermostat is designed to provide accurate but simple temperature control for the user. When the thermostat is not calling, only the space temperature is displayed on the LCD along with the padlock icon that confirms the thermostat setup functions cannot be changed. The user can use the ( ) and ( ) keys to change the thermostat setpoint within the setpoint limits and review the status points by pressing the STATUS key. (Figure 13)

Changing the setpoint
When the( ) and( ) keys are pressed, the thermostat will display the word SET. The setpoint then can be changed within the setup limits. (Figure 14)

Call for heating
When the thermostat calls for heating, the word HEAT will be displayed on the LCD. (Figure 15)

Call for cooling
When the thermostat calls for cooling, the word COOL will be displayed on the LCD. (Figure 16)

Helpful Hint:
The thermostat can only be turned off when unlocked.

Advanced Functions

Damper position override
The thermostat has a damper position override feature to assist in air balancing and bypass damper setup. With the thermostat unlocked, press and hold the SETUP key until the word DAMPER appears on the LCD. (Figure 17)

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $26$$

Override to open
Press the ( ) and ( ) keys until the word OPEN appears on the LCD and then press the ENTER key. The damper will drive open and remain in the open position until the override is canceled (Figure 18)

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $27$$

Override to close
Press the ( ) and ( ) keys until the word CLOSE appears on the LCD and then press the ENTER key. The damper will drive closed and remain in the closed position until the override is canceled. (Figure 19)

$iO-HVAC-CONTROLS-Z-2000-T-Thermostat-Fig- $28$$

Canceling the damper override
For the thermostat to control normal damper operation, the override must be canceled. Press and hold the SETUP key until the word DAMPER OPEN or DAMPER CLOSE appears on the LCD. Use the ( ) and ( ) keys until only the word DAMPER is displayed and then press the ENTER key. The thermostat will then resume normal operation.