Robertshaw 8401 User Manual
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Robertshaw 8401 User Manual

1 heat / 1 cool digital non-programmable thermostat
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NeW
110-1087B
Application
The Robertshaw 8401 is a single-stage thermostat designed to control
24 VAC gas or electric heating and cooling systems or single-stage heat
pump. The 8401 requires the use of a common wire.
Features
• Large backlit display
• Adjustable temperature differential: 1°F to 3.0°F (0.5°C to 1.5°C)
• 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
8 401
®
1
DIGITAL
NON-PROGRAMMABLE
THERMOSTAT
G
E
GAS
ELECTRIC
1 Heat / 1 Cool
User's Manual

Quick Start

Installation
O
H
OIL
HEAT PUMP

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Summary of Contents for Robertshaw 8401

  • Page 1: Quick Start

    Quick Start Installation 110-1087B Application The Robertshaw 8401 is a single-stage thermostat designed to control 24 VAC gas or electric heating and cooling systems or single-stage heat pump. The 8401 requires the use of a common wire. Features • Large backlit display •...
  • Page 2 Return the mercury or mercury products, in a sealed container, to Invensys Controls Americas or a local recycling center for proper disposal. If you have any questions, call Robertshaw technical support at 1-800-445-8299. Invensys Controls Americas 28C Leigh Fisher Blvd.
  • Page 3 4. Remove existing thermostat base from wall. Figure 1 Step 2: Installing Model 8401 Thermostat NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON INSIDE WALL, FIVE FEET ABOVE THE FLOOR. DO NOT...
  • Page 4 4. Remove the cover using a coin or screwdriver (Figure 3). Set aside. a u to o o l o ff c h e a t ° M O N s e t v a c c lo c k te m p h o ld r u n /s...

  • Page 5: Wiring Diagrams

    Wiring Diagrams ♦ HEAT/COOL 4-WIRE SINGLE TRANSFORMER Transformer 24 VAC 120 VAC Heating Control Cooling Control Control HEAT ONLY 3-WIRE SINGLE TRANSFORMER Transformer 24 VAC 120 VAC Heating Control Control HEAT ONLY 2-WIRE SINGLE TRANSFORMER Transformer 24 VAC 120 VAC Heating Control...

  • Page 6: Cool Only

    Wiring Diagrams ♦ (continued) COOL ONLY 3-WIRE SINGLE TRANSFORMER Transformer 24 VAC 120 VAC Cooling Control Control HEAT PUMP WITH COOL ACTIVE REVERSING VALVE Transformer 24 VAC 120 VAC Compressor Contactor Relay Reversing Valve HEAT PUMP WITH HEAT ACTIVE NOTE: Make sure the HP switch is in the HP position.
  • Page 7 TERMINAL LEGEND - 8401 TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION 24VAC hot connection For input of 24VAC hot connection 24VAC common connection For input of 24VAC common side of transformer Heat connection Yes* Energizes on a call for heating...

  • Page 8: Step 3: Testing The Thermostat

    Step 3: Testing the Thermostat WARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS VALVE OR SYSTEM CONTROL TO TEST OPERATION. THIS WILL DAMAGE THE THERMOSTAT AND VOID YOUR WARRANTY. CAUTION: DO NOT SWITCH SYSTEM TO COOL OR LEAVE IN COOL MODE IF THE TEMPERATURE IS BELOW 50°F (10°C).

  • Page 9: Changing °F To °C

    Step 4: Customizing the Thermostat Settings ♦ System Cool: The thermostat controls the cooling. Off: The heating and cooling systems are off. Heat: The thermostat controls the heat. Auto: Equipment controls the fan. On: The fan operates continuously. Temperature Differential ♦...

  • Page 10: Backlit Display

    Check Filter Reset ♦ Once the filter timer has expired, CHECK FILTER will turn on and stay on. To clear the message and reset the timer: 1. Press the buttons and hold for 3 seconds. CLr will appear in the time display.

  • Page 11: Step 5: Troubleshooting

    Step 5: Troubleshooting Symptom Remedy Check wiring (see Installation Thermostat does not turn on system. section). Thermostat turns system on and Increase temperature differential (see Changing the Temperature off too frequently. Differential section). Move Electric/Gas switch to System fan does not operate either gas or electric, to match properly.

  • Page 12: Two-Year Limited Warranty

    Invensys Controls Americas warrants to the original contractor installer, or to the original consumer user, each new Robertshaw thermostat to be free from defects in materials and workmanship under normal use and service for a period of two (2) years from date of purchase.

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