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Step 5  

Mount New Base

1)  Gently separate the display from the base by pulling first from 

the bottom and then the top until the two pieces unsnap.

 

 

2)   Position the base against your wall, and 

determine if wall anchors from current 

thermostat align with screw locations of  

new base.

3)  If base does not align with existing anchor 

holes, mark new screw locations with a pencil. 

 

 

 

    Drill 3/16" hole for the anchor

 

 

 

    Drill 7/32" hole for the anchor

4)  Pull wires through opening in base and  

secure to the wall using provided screws.

TIP:

 Use a level to ensure 

thermostat is properly aligned 
before marking screw locations.

Drywall

Plaster

Step 4  

Remove Current Backplate

Unscrew the current backplate and remove it 

from the wall. Be careful not to let the wires fall 

into the wall.

TIP:

 Wrap the wires around 

a pencil or pen to keep them 
from falling inside the wall.

REMOVE THE THERMOSTAT BACKPLATE:

 

Using the Finger Pull Areas, pull the 
front housing away from the backplate.

PULL OUT WITH THUMBS IN THESE AREAS.

Backplate

Faceplate

Installation Instructions

7

Summary of Contents for Onelink THERM-500

Page 1: ...Model THERM 500 Installation Manual...

Page 2: ...t Onelink Wi Fi Thermostat is easy to install easy to use and can help save you money on your heating and cooling costs A typical installation takes only 20 30 minutes If you have any problems or ques...

Page 3: ...ncluding 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 emergen...

Page 4: ...Step 1 Power Off Current System 1 Go to your home s circuit breaker panel and switch the furnace and air conditioner breakers off 2 To confirm power is off adjust the temperature on your current therm...

Page 5: ...erminal designations on your old thermostat do not match those on the new thermostat refer to sample wiring diagrams in full user s manual at www firstalert com thermostats Wire from the Install on th...

Page 6: ...r the anchor 4 Pull wires through opening in base and secure to the wall using provided screws TIP Use a level to ensure thermostat is properly aligned before marking screw locations Drywall Plaster S...

Page 7: ...systems TIP Use pliers to straighten wire before inserting into new base Be sure to cut any excess wire where the insulation extends to the terminal block when the wire is installed properly to the t...

Page 8: ...ated for C common then the G or F fan wire can be used instead Connect your G or F wire to the common terminal of the thermostat This G or F wire will then also need to be moved to the common terminal...

Page 9: ...l when heating When GAS is chosen the thermostat will not energize the Fan G terminal the HVAC will take over the fan control When ELEC is chosen the thermostat will energize the fan in heating 2 When...

Page 10: ...r to create an account and access your thermostat remotely for control away from the home Step 9 Switch Breakers Back On Turn your furnace and air conditioner breakers back on at your breaker panel Di...

Page 11: ...e free of anomalies errors or Bugs This warranty does not cover any costs relating to removal or replacement of any product or software installed on your computer BRK reserves the right to make change...

Page 12: ...ser is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Conn...

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