9405 ® NeW DIGITAL NON-PROGRAMMABLE THERMOSTAT G E M GAS ELECTRIC MILLIVOLT 1 Heat User's Manual Quick Start Installation 110-1042 Application The Robertshaw 9405 is a single-stage thermostat designed to control 24 VAC gas, electric, or millivolt heating systems. Features • Low battery indicator • Large back lit display • Adjustable temperature differential: .5°F to 3.0°F (0.5°C to 1.
! IMPORTANT SAFETY INFORMATION 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. • 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.
Recycling Thermostat If this thermostat is replacing a thermostat that contains mercury in a sealed tube, do not place your old thermostat in the garbage. Contact your local waste management authority for instructions regarding proper disposal of the thermostat. If you have any questions, call Robertshaw technical support at 1-800-445-8299. Step 2: Installing Model 9405 Thermostat NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON INSIDE WALL, FIVE FEET ABOVE THE FLOOR.
5. Place thermostat against the wall at desired location. Make sure wires will feed through opening (Figure 4) on base of thermostat. 6. Mark placement of mounting holes (Figure 4). Set base aside. Mounting Holes GAS RESET NON-HP ELEC HP Wiring Opening Figure 4 7. If mounting on drywall, tap plastic anchors into wall. NOTE: ENCLOSED PLASTIC ANCHORS DO NOT REQUIRE A DRILLED HOLE FOR DRYWALL. 8. If mounting on a surface other than drywall, drill the marked holes using a 3/16" drill bit. 9.
◆ Wiring Diagrams HEAT ONLY 2-WIRE SINGLE TRANSFORMER Transformer R Hot 120 VAC 24 VAC W HEATING CONTROL G T H E R M O S T A T HEAT ONLY 3-WIRE SINGLE TRANSFORMER Transformer Hot 120 VAC R 24 VAC HEATING CONTROL W G FAN CONTROL T H E R M O S T A T 250-750 MILLIVOLT SYSTEM Gas valve TT PP PP TN R Pilot Generator W G 5 T H E R M O S T A T
TERMINAL LEGEND - 9405 TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION R 24VAC hot connection Yes W Heat connection Yes* G Indoor fan connection Yes For input of 24VAC hot side of heat transformer Energizes on a call for heating Energizes with W terminal or with FAN option switched to the ON position GAS/ELECTRIC Switch °F ROOM OFF GAS RESET ELEC + NON-HP - HP + Figure 6 15.
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 display will read HEAT. 2. Press the button until the temperature setting is at least 3 degrees above room temperature. The heating system should turn on. The fan may not turn on immediately, depending on the fan delay built into the furnace.
4. Put the -ON-AUTO switch into the ON position. The blower fan should turn on. The display will show a 5. Put the and ON. -ON-AUTO switch into the AUTO position. The blower fan should turn off. Step 4: Customizing the Thermostat ◆ Settings System Off: The heating system is off. Heat: The thermostat controls the heat. Fan Auto: Equipment controls the fan. On: The fan operates continuously. Temperature Heating: The default temperature for heating is 70°F (21°C).
◆ 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. If the system turns on too often, increase the temperature differential. ◆ Changing Fahrenheit (°F) to Celsius (°C), and the Temperature Differential 1. The thermostat is preset to display the temperature in degrees Fahrenheit (US models) or degrees Celsius (Canadian models).
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 LOW BATT. Replace batteries. System fan does not operate properly. Move fan option switch to either gas or electric, to match system (see Installation section).
Two Year Limited Warranty Maple Chase 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.
NOTES 12
