Owner's Manual

ManualsBrandsRobertshaw ManualsNon-Programmable ThermostatsRobertshaw Jan-05

DIGITAL

NON-PROGRAMMABLE

THERMOSTAT

405

ELECTRIC

GAS

OIL

NeW

1 Heat

User's Manual

Quick Start

Installation

MILLIVOLT

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.

110-1161

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Summary of content (12 pages)

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10-1161.qxd 6/9/05 10:41 AM Page 1 8405 ® NeW DIGITAL NON-PROGRAMMABLE THERMOSTAT G E O M GAS ELECTRIC OIL MILLIVOLT 1 Heat User's Manual Quick Start Installation 110-1161 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.
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110-1161.qxd 6/9/05 10:41 AM 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. Do not install on voltages higher than 30 VAC. • All wiring must conform to local and national building and electrical codes and ordinances.
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110-1161.qxd 6/9/05 10:41 AM Page 3 1. Turn off power to heating system. 2. Remove cover from old thermostat to expose wires (Figure 1). 3. Disconnect wires one at a time from existing terminals. Use enclosed labels to mark existing wires. Refer to cross references in the Wiring Table if existing wiring does not directly match the labels. 4. Remove existing thermostat base from wall.
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110-1161.qxd 6/9/05 10:41 AM Page 4 4. Remove the cover using a coin or screwdriver (Figure 3). Set aside. auto off heat on cool ° F MON set p vac clock t temld hold ho run/se prog Figure 3 5. Place thermostat against the wall at desired location. Make sure wires will feed through opening (Figure 4) on base of thermostat. Mounting Holes – ° F + – RH RC G O B Y1 W1 ELEC GAS + Figure 4 6. Mark placement of mounting holes (Figure 4). Set base aside. 7.
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110-1161.qxd 6/9/05 10:41 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. The will be displayed. heat off 2. Press the button until the temperature setting is at least 3 degrees above room temperature. The heating system should turn on.
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110-1161.qxd 6/9/05 10:41 AM Page 8 Step 4: Customizing the Thermostat ♦ Settings System Off: The heating and cooling systems are off. Heat: The thermostat controls the heat. Fan Auto: Equipment controls the fan. On: The fan operates continuously. ♦ Temperature Differential The temperature differential is factory set at 1.0°F (.5°C). This means that whenever the room temperature changes by one degree Fahrenheit from the temperature setting, the system will turn on.
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110-1161.qxd 6/9/05 10:41 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 and buttons and hold for 3 seconds. CLr will appear in the time display. 2. Press any key to clear the message. The display will transition to the temperature scale display as described in the previous section. 3. No further input is needed. Within a few seconds, the display will return to the normal operating mode.
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110-1161.qxd 6/9/05 10:41 AM Page 10 Step 5: Troubleshooting Symptom Remedy Thermostat does not turn on system. Check wiring (see Installation section). Thermostat turns system on and off too frequently. Increase temperature differential (see Changing the Temperature Differential section). Display is blank, flashing or constant LO BATT. Replace batteries. System fan does not operate properly. Move Electric/Gas switch to either electric or gas, to match system (see Installation section).
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0-1161.qxd 6/9/05 10:41 AM Page 11 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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