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110-1086B.qxd 3/8/05 10:26 AM Page 1
DIGITAL
NON-PROGRAMMABLE
400
® 8
THERMOSTAT
G E O H
GAS ELECTRIC OIL HEAT PUMP
NeW
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
• Adjustable temperature differential: 1°F to 3.0°F (0.5°C to 1.5°C)
• Compressor short cycl
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110-1086B.qxd 3/8/05 10:26 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. • Do not short (jumper) across term
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110-1086B.qxd 3/8/05 10:26 AM Page 3 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 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. Figure 1 Step 2: Installing Model 8400 Thermostat NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT O
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110-1086B.qxd 3/8/05 10:26 AM Page 4 4. Remove the cover using a coin or screwdriver (Figure 3). Set aside. 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 NON_HP HP GOB Y1 W1 ELEC GAS + Figure 4 6. Mark placement of mounting holes (Figure 4). Set base aside. 7. If mounting on drywall, tap plastic anchors into wall. NOTE: Enclosed plastic anchors do not require a
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110-1086B.qxd 3/8/05 10:26 AM Page 5 ♦ Wiring Diagrams HEAT/COOL HEAT ONLY 4-WIRE 3-WIRE SINGLE TRANSFORMER SINGLE TRANSFORMER Factory-Installed Factory-Installed Jumper Jumper RH RH T T Transformer Transformer H H RC Hot RC Hot E E 120 VAC 24 VAC 24 VAC 120 VAC Heating Heating R R W1 W1 Control Control M M O O Cooling Y1 Y1 Control S S T T Fan G Fan Control G A A Control T T O O B B HEAT ONLY COOL ONLY 2-WIRE 3-WIRE SINGLE TRANSFORMER SINGLE TRANSFORMER NOTE: Remove factory installed jumper
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110-1086B.qxd 3/8/05 10:26 AM Page 6 ♦ Wiring Diagrams HEAT/COOL 5-WIRE TWO TRANSFORMER NOTE: Disconnect factory installed jumper. (HEATING) Transformer Hot RH 120 VAC 24 VAC T H RC CAUTION: Both transformers E must be in phase or damage Heating to the equipment and thermostat W1 R Control may result. M Cooling Y1 O Control S Fan T G Relay Hot A O 120 VAC 24 VAC T B (COOLING) Transformer HEAT PUMP WITH COOL ACTIVE REVERSING VALVE NOTE: Factory Installed Jumper RH T Transformer H RC Hot 24 VAC
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110-1086B.qxd 3/8/05 10:26 AM Page 7 TERMINAL LEGEND - 8400 TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION Rh 24VAC hot connection Yes For input of 24VAC hot side of heat transformer Rc 24VAC hot connection Yes For input of 24VAC hot side of cool transformer W1 Heat connection Yes* Energizes on a call for heating Y1 Compressor Connection Yes* Energizes on a call for cooling B Heat active reversing valve** No Energizes when in the HEAT mode O Cool active reversing valve** No Energizes when i
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110-1086B.qxd 3/8/05 10:26 AM Page 8 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). THIS CAN DAMAGE THE AIR CONDITIONING SYSTEM AND CAUSE PERSONAL INJURY. 1. Place the HEAT-OFF-COOL switch into the COOL position. The will be displayed. 2. Press the butto
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110-1086B.qxd 3/8/05 10:26 AM Page 9 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. 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 syst
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110-1086B.qxd 3/8/05 10:26 AM Page 10 ♦ 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 oper
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110-1086B.qxd 3/8/05 10:26 AM Page 11 Step 5:Troubleshooting Symptom Remedy Check wiring (see Installation Thermostat does not turn on system. section). Thermostat turns system on and Increase temperature differential off too frequently. (see Changing the Temperature Differential section). Display is blank, flashing or Replace batteries. constant LOW BATT. System fan does not operate Move Electric/Gas switch to either electric or gas, to match properly. system (see Installation section). Th
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110-1086B.qxd 3/8/05 10:26 AM 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. This warranty and our liability does not apply to batteries or merchandise that has been damaged by misuse, neglect, mishandling, alterations, improper install
