Table of Contents
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NeW
110-1086B
Application
The Robertshaw 8400 is a single-stage thermostat designed to control
24 VAC gas or electric heating and cooling systems or single-stage
heat pump.
Features
• Low battery indicator
• 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
• Low temperature freeze protection. While in heat mode, the
thermostat will mechanically turn on the heat if the temperature
drops to 40°F (4°C) – even if the batteries are drained or missing.
8 400
®
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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Table of Contents
Related Manuals for Robertshaw 8400
Summary of Contents for Robertshaw 8400
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Page 1: Quick Start
1 Heat / 1 Cool User's Manual Quick Start Installation 110-1086B Application The Robertshaw 8400 is a single-stage thermostat designed to control 24 VAC gas or electric heating and cooling systems or single-stage heat pump. Features • Low battery indicator • Large backlit display •... - Page 2 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.
- Page 3 4. Remove existing thermostat base from wall. Figure 1 Step 2: Installing Model 8400 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...
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Page 5: Wiring Diagrams
Wiring Diagrams ♦ HEAT ONLY HEAT/COOL 3-WIRE 4-WIRE SINGLE TRANSFORMER SINGLE TRANSFORMER Factory-Installed Factory-Installed Jumper Jumper Transformer Transformer 24 VAC 120 VAC 24 VAC 120 VAC Heating Heating Control Control Cooling Control Control Control COOL ONLY HEAT ONLY 2-WIRE 3-WIRE SINGLE TRANSFORMER SINGLE TRANSFORMER NOTE: Remove factory... -
Page 6: Wiring Diagrams
Wiring Diagrams ♦ HEAT/COOL 5-WIRE TWO TRANSFORMER NOTE: Disconnect factory installed jumper. (HEATING) Transformer 120 VAC 24 VAC CAUTION: Both transformers must be in phase or damage to the equipment and thermostat Heating Control may result. Cooling Control Relay 120 VAC 24 VAC (COOLING) Transformer... - Page 7 TERMINAL LEGEND - 8400 TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION 24VAC hot connection For input of 24VAC hot side of heat transformer 24VAC hot connection For input of 24VAC hot side of cool transformer Heat connection Yes* Energizes on a call for...
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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). Replace batteries. Display is blank, flashing or constant LOW BATT. -
Page 12: Two-Year Limited Warranty
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.