Robertshaw 8425 - Manual

Robertshaw 8425

Robertshaw 8425 – Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.

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Table of Contents:

  • Page 2 – Wiring Table; Old Terminal
  • Page 3 – Step 2: Installing Model 8425 Thermostat; NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON; Turn power off to the heating and cooling systems.; Figure 2
  • Page 4 – Figure 3; Figure 4
  • Page 5 – Wiring Diagrams
  • Page 7 – Figure 5
  • Page 8 – Step 3: Testing the Thermostat; CAUTION: DO NOT SWITCH SYSTEM TO COOL OR LEAVE IN COOL MODE
  • Page 9 – System; Temperature Differential; diFF
  • Page 10 – Check Filter Reset; CHECK FILTER; Backlit Display
  • Page 11 – Step 5: Troubleshooting; Symptom; Thermostat does not turn on system.; Installation; If problems with thermostat cannot be resolved, call:; For after hours service, a 24-hour automated; Changing the Temperature
  • Page 12 – Two Year Limited Warranty; warrants to the original contractor; Invensys Controls Americas; recommendations; Invensys Controls Americas; agrees to repair or replace at its option any; Invensys; shall not be liable; Invensys Controls Americas; Warranty Claims Department
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D I G I TA L

N O N - P R O G R A M M A B L E

T H E R M O S TAT

8425

E L E C T R I C

E

G A S

G

O I L

O

®

NeW

2 Heat / 2 Cool

User's Manual

Quick Start
Installation

H E AT P U M P

H

Application

The Robertshaw 8425 is a multi-stage thermostat designed to control
24 VAC heat pump systems.

Features

• Large backlit display

• Adjustable 1

st

stage temperature differential: 1.0°F to 3.0°F (0.5°C to

1.5°C)

• Adjustable 2

nd

stage temperature differential: 1.0°F to 6.0°F (0.5°C to

3.0°C)

• Adjustable 2

nd

stage delay (10-40 minutes)

• Compressor short cycle protection

• Accuracy within ±1°

• Zone system compatible as a master thermostat

• Permanent memory retention

• Fahrenheit/Celsius display option

• Adjustable from 45°F to 90°F (7°C - 32°C)

• Quick wire terminal block

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Summary

Page 2 - Wiring Table; Old Terminal

WARNING: • Always turn off power at main fuse or circuit breaker panel before installing, removing, cleaning, or servicing thermostat. • Read all the information in this manual before installing this thermostat. • DO NOT CONNECT TO 120 VAC. This is a 24 VAC low-voltage thermostat. Do not install on ...

Page 3 - Step 2: Installing Model 8425 Thermostat; NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON; Turn power off to the heating and cooling systems.; Figure 2

WARNING: In heat pump applications, do not connect anything to the W1terminal. When switched to HP mode, W1 is connected internallyto Y1 on the thermostat. 1. Turn off power to heating and cooling system. 2. Remove cover from old thermostat to expose wires (Figure 1). 3. Disconnect wires one at a ti...

Page 4 - Figure 3; Figure 4

4. Remove the cover using a coin or screwdriver (Figure 3). Set aside. 5. Place thermostat against the wall at desired location. Make sure wires will feed through opening (Figure 4) on base of thermostat. 6. Mark placement of mounting holes (Figure 4). Set base aside. 7. If mounting on drywall, tap ...

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