2GIG-STZ-1 Z-Wave Plus Thermostat — Installation & User Guide

Complete installation and user guide for the 2GIG-STZ-1 Z-Wave Plus battery-powered thermostat, covering wiring, HVAC system setup, Z-Wave inclusion, and troubleshooting.

Overview

The 2GIG-STZ-1 is a programmable, Z-Wave communicating thermostat. It can be powered using 24VAC (if both "R" and "C" wires are available) or four (4) AA batteries. It works with most compatible Z-Wave hubs/controllers to operate the thermostat, configure settings, and display current conditions. Do not use on 120VAC systems. Compatible with 24VAC gas, oil, or electric heating/cooling systems, or gas millivolt heating systems.

• Standard Systems: 1 or 2 Stage Heating and Cooling
• Heat Pump Systems: 1 or 2 Stage Heating and Cooling, plus 2nd/3rd Stage Aux Heat (Electric Heat Strips)
• Fahrenheit/Celsius mode with sensor calibration
• External humidifier/dehumidifier support
• Fan mode control (Auto, On) — Fan Off is not supported over Z-Wave

Box Contents

• 1 — Z-Wave Plus Thermostat
• 2 — Plastic Wall Anchors
• 4 — AA Batteries
• 2 — Phillips Screws

Thermostat Power

Powered by either 24VAC from the HVAC system or four (4) AA batteries. Powering with 24VAC requires both the "C" common wire (typically blue) and the "R" return wire (typically red). Battery power does not require a "C" wire connection — do not install batteries if the thermostat is already powered by 24VAC (they are not needed for backup). On batteries, expect roughly 2 years of life depending on usage and backlight frequency. Always use Alkaline batteries and replace as a complete set of 4.

Important: When battery-powered on a Z-Wave network, the thermostat will NOT function as a Z-Wave repeater.

Removing the Existing Thermostat

1. Turn off thermostat power, usually at the HVAC system or circuit breaker panel.
2. Remove the old thermostat cover to expose wiring terminals.
3. Take a picture of the wiring before disconnecting anything.
4. Label each wire by its terminal marking (not by wire color, since colors can vary).
5. Remove the old thermostat base. Don't let wires slip into the wall or touch each other.

Warning: If the old thermostat contains mercury, dispose of it per federal/state/local regulations — many areas have hazardous waste or exchange programs (see epa.gov).

Wiring Terminal Reference

Single-transformer systems: one "R" wire connects to either RC or RH (a jumper links the two terminals). Dual-transformer systems: connect the cooling system's "C" wire to the thermostat "C" terminal (never the heating system's C wire) and remove the RC–RH jumper.

Thermostat Setup Menus

Default preset: Standard gas/electric HVAC, Gas heat fan type, 1 stage heating, 1 stage cooling. No changes needed if installed on this type of system. For any other configuration (e.g. Heat Pump), update the SYSTEM menu.

• SETUP — Fahrenheit/Celsius, Backlight Timeout (10-30s, default 20s), Sensor Calibration (±13°F), Status Line (Setpoint or Clock)
• SYSTEM — System Type (Standard/Heat Pump), Fan Type (Gas/Electric), Changeover Type (With Cool [default] / With Heat)
• HUMI — Disable/Humidify/Dehumidify, Moist Setpoint (30-70%), Dry Setpoint (30-70%), Cooling Setpoint Shift (0-18°F)
• Z-WAVE — Install/uninstall from Z-Wave network
• CLOCK — Set day and time
• INFO — Model, firmware version, Z-Wave network info, battery %

To enter Menu Mode, touch and hold MODE. Use the arrow buttons to scroll, FAN (Select) to choose/confirm, and MODE (Done) to exit. For multi-stage system settings, use the Advanced System Settings Menu (touch and hold MODE, then hold MODE + Down arrow for 5 seconds from the Setup menu) — intended for qualified HVAC installers.

Z-Wave Inclusion / Exclusion

Supports S0, S2 Unauthorized, and S2 Authenticated inclusion modes. The S2 QR code/pin code is printed on a label above the LCD screen under the faceplate.

1. Set primary controller to Include/Add/Install mode.
2. Touch any button on the thermostat to wake it.
3. Touch and hold MODE for 5 seconds until SETUP appears.
4. Scroll to "Z-Wave," touch FAN (Select).
5. Confirm YES on the controller's Z-Wave Install screen, then touch FAN (Select) again.
6. Display flashes WAIT then SUCCESS (or FAIL — repeat steps 3-6 to retry).

SmartStart: pre-include the thermostat by scanning its Z-Wave QR code with a SmartStart controller in Security S2 Authenticated Add Mode, key in the DSK, power on the device, and wait — no further action needed; it joins automatically within 10 minutes. Allow at least 15 minutes after power-cycling before relying on SmartStart inclusion.

To remove from a network: set the controller to exclude/remove mode, wake the thermostat, hold MODE for 5 seconds, scroll to Z-Wave and select, then confirm YES when prompted.

Error Codes

Specifications

Warranty

Nortek Security & Control warrants the product against defects in materials/workmanship for 1 year from purchase date (residential use in the 50 US states or DC, at original install site, non-transferable). Doesn't cover labor for removal/reinstallation, or damage from misuse, unauthorized modification, power surges, or acts of God. Contact returns@nortekcontrol.com with model number, sales receipt copy, and problem description to obtain a Return Authorization Number before shipping anything back.