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5
WIRE
4
WIRE
Necessary Tools
WiFi Password Screw Driver Pencil
Level Pliers
Hammer or Drill
(3/16" or 7/32" drill bits)
Contents
Thermostat
Display
Thermostat
Base
Drywall Anchors
and Screws
Installation
Manual
Jumper
Wire
4
Compatibility
The First Alert
™
Onelink™ Wi-Fi Thermostat is designed to work with
both 4-Wire and 5-Wire 24V systems, including gas, electric, oil,
forced air, variable speed, heat pump and radiant. It can control:
• Heating: one, two and three stages (W1, W2, W3)
• Cooling: one and two stages (Y1, Y2)
• Heat pump: with auxiliary and emergency heat (Y, W1, O/B)
• Fan (G)
• Power (C, R)
• Humidifier or dehumidifier (HUM, DEHUMM)
• Dual fuel systems (heat pump with furnace)
• Whole-home humidifiers and dehumidifiers
Before you begin installation, determine what your existing wiring
and equipment situation is. If you are unsure of what type of system
you have, you may need to seek professional support.
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