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110-1088B.qxd
3/8/05
NeW
110-1088B
Application
The Robertshaw 8405 is a single-stage thermostat designed to control
24 VAC gas or electric heating or millivolt HVAC systems.
Features
• Low battery indicator
• Large backlit display
• Adjustable temperature differential: 1°F to 3.0°F (0.5°C to 1.5°C)
• 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.
10:28 AM
Page 1
8 405
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GAS
ELECTRIC
1 Heat
User's Manual
Quick Start
Installation
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DIGITAL
NON-PROGRAMMABLE
THERMOSTAT
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O
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MILLIVOLT
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Summary of Contents for Robertshaw 8405
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Page 1: Quick Start
User's Manual Quick Start Installation 110-1088B Application The Robertshaw 8405 is a single-stage thermostat designed to control 24 VAC gas or electric heating or millivolt HVAC systems. Features • Low battery indicator • Large backlit display • Adjustable temperature differential: 1°F to 3.0°F (0.5°C to 1.5°C) •... - 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 8405 Thermostat NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON INSIDE WALL, FIVE FEET ABOVE THE FLOOR. DO NOT...
- Page 4 110-1088B.qxd 3/8/05 10:28 AM Page 4 4. Remove the cover using a coin or screwdriver (Figure 3). Set aside. au to of f co he at ° M ON se t va c cl oc k te m p ho ld ru n/ se ho ld pr og...
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Page 5: Wiring Diagrams
110-1088B.qxd 3/8/05 10:28 AM Page 5 Wiring Diagrams ♦ HEAT ONLY 2-WIRE SINGLE TRANSFORMER Factory-Installed Jumper Transformer 120 VAC 24 VAC Heating Control HEAT ONLY 3-WIRE SINGLE TRANSFORMER Factory-Installed Jumper Transformer 120 VAC 24 VAC Heating Control Control 250-750 MILLIVOLT SYSTEM Factory-Installed Jumper... - Page 6 110-1088B.qxd 3/8/05 10:28 AM Page 6 TERMINAL LEGEND - 8405 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...
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Page 7: Step 3: Testing The Thermostat
110-1088B.qxd 3/8/05 10:28 AM Page 7 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. 1. Put the HEAT-OFF switch into the HEAT position. will be displayed. -
Page 8: Settings
110-1088B.qxd 3/8/05 10:28 AM Page 8 Step 4: Customizing the Thermostat Settings ♦ System 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 9: Check Filter Reset
110-1088B.qxd 3/8/05 10:28 AM Page 9 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 10: Step 5: Troubleshooting
110-1088B.qxd 3/8/05 10:28 AM Page 10 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). Display is blank, flashing or Replace batteries. -
Page 11: 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. - Page 12 110-1088B.qxd 3/8/05 10:28 AM Page 12 NOTES...
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