Robertshaw 9405 Non-Programmable Thermostat
IMPORTANT INSTRUCTION
WARNING:
- Always turn off power at the main power source by an unscrewing fuse or switching circuit breaker to the off position before installing, removing, cleaning or servicing thermostat.
- Read all of the information in this manual before installing or programming this thermostat
- This is a 24V AC low-voltage thermostat. Do not install on voltages higher than 30V AC.
- All wiring must conform to local and national building and electrical codes and ordinances.
- Do not short (jumper) across terminals on the gas valve or at the system control to test installation. This will damage the thermostat and void the warranty
Features
- Low battery indicator
- Large back lit display
- Adjustable temperature differential: .5°F to 3.0°F (0.5°C to 1.5°C)
- Accuracy within ±1°
- 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, thermostat will mechanically turn on heat if the temperature drops to 40°F (4°C) even if batteries are missing or drained.
- Automatic heating shutdown if temperature exceeds 94°F (34°C)
Replacing Existing Thermostat
- Turn off power to heating and cooling system.
- Remove cover of old thermostat to expose wires.
- Disconnect wires one at a time from existing terminals.
- Use enclosed labels to mark existing wires. Refer to cross references in Table 1 if existing wiring does not directly match the labels.
- Remove existing thermostat base from wall.
| Old Terminal | New Label | Description |
| M,R,Rh,R5 or 5 | R | Heat transformer, hot side |
| H,W, or 4 | W | Heating control |
| F or G | G | Fan control relay |
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.
Installing Model 9405 Thermostat
- Turn power off to the heating system.
- Place HEAT-OFF in OFF position
- Place -ON-AUTO switch into AUTO position (
- Remove the cover using a coin or screwdriver
- Place thermostat against the wall at desired location. Make sure wires will feed through opening (Figure 4) on base of thermostat.
- Mark placement of mounting holes (Figure 4). Set base aside. If mounting on drywall, tap plastic anchors into wall.
- NOTE: ENCLOSED PLASTIC ANCHORS DO NOT REQUIRE A DRILLED HOLE FOR DRYWALL.
- If mounting on a surface other than drywall, drill the marked holes using a 3/16″ drill bit.
- Align base with plastic anchors and feed wires through opening.
- Secure base to wall with supplied screws.
- NOTE: THE THERMOSTAT WILL MOUNT HORIZONTALLY ON A SINGLE GANG JUNCTION BOX.
- Strip end of wires 5/16” if needed.
- Terminal screws are already loose and ready for wire insertion. Insert wires into terminal strip (Figure 5) matching the label to the corresponding terminal (see Wiring Diagrams). Tighten screws.
- Make sure wire connections are secure.
- Push excess wire back through opening.
- Set the GAS/ELEC switch to either GAS for a gas/oil heating system or ELEC for an electric heating system ( .
- Install two AA Energizer brand batteries or equivalent into battery compartment
- Replace thermostat cover by snapping into place
| TERMINAL LEGEND – 9405 | |||
| TERM | EQUIPMENT TO CONNECT | REQ? | TERMINAL FUNCTION |
| R | 24VAC hot connection | Yes | For input of 24VAC hot side of heat transformer |
| W | Heat connection | Yes* | Energizes on a call for heating |
| G | Indoor fan connection | Yes | Energizes with W terminal or with FAN option switched to the ON position |
Wiring Diagrams
Testing the Thermostat
- Put the HEAT-OFF switch into the HEAT position. The display will read HEAT.
- 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. The flame icon will be displayed.
- Put the HEAT-OFF switch into the OFF position. The heating system should turn off. The fan may continue to run for a short period of time.
- Put the
-ON-AUTO switch into the ON position. The blower fan should turn on. The display will show a and ON.
- Put the -ON-AUTO switch into the AUTO position. The blower fan should turn off.
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). To change the default setpoint, put the system switch in HEAT and press the or button to adjust the temperature setting up or down. The display will show SET. The display will return to the current room temperature three seconds after the last input and the new setpoint will be saved
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
- The thermostat is preset to display the temperature in degrees Fahrenheit (US models) or degrees Celsius (Canadian models). The temperature display can be changed. Press and hold both the and button for three seconds. The display will read F or C.
- Release buttons. Press the or button to switch the display.
- After three seconds the display will switch to the differential settings. The display will read SET DIFF.
- The temperature differential is factory set at 1.0°F (0.5°C). Press the
button to adjust the differential up or down. - Wait three seconds or press and the display will return to the original room temperature.
Backlit Display
This thermostat is equipped with a backlight to make nighttime temperature adjustments quick and easy. Press the button to activate the backlight. The backlight will turn off after about 5 seconds of inactivity.
Reset
To reset the thermostat press the RESET button located at the lower left corner of the base
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). |
| Thermostat does not display proper room temperature. | Check F/C (Fahrenheit/Celsius) setting. See Changing Fahrenheit
(F) to Celsius (C). |
Warranty
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. This warranty and our liability does not apply to batteries or merchandise that has been damaged by misuse, neglect, mishandling, alterations, improper installation, or use in a way other than in accordance with Maple Chase recommendations and instructions. Maple Chase agrees to repair or replace at its option any thermostat under warranty provided it is returned within the warranty period, postage prepaid, with proof of the date of purchase. Cost of thermostat removal or reinstallation is not the responsibility of Maple Chase. Repair or replacement as provided under this warranty is the exclusive remedy of the consumer. Maple Chase shall not be liable for any incidental or consequential damages for breach of any express or implied warranty on this product, or under any other theory of liability. Except to the extent prohibited by applicable law, any implied warranty of merchantability or fitness for a particular purpose on this product is limited to the duration of this warranty. Some states do not allow the exclusion or limitation of incidental or consequential damages, or allow limitations on how long an implied warranty lasts, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
For warranty returns, send thermostat, shipping prepaid to:
- Uni-Line North America
- Warranty Claims Department
- 515 S. Promenade
- Corona, CA 91719
If problems with thermostat cannot be resolved, call:
- Technical Support: (800) 445-8299
- Monday-Friday 7:30 AM – 5:30 PM CST
REFERENCE
DOWNLOAD MANUAL
Robertshaw 9405 Non-Programmable Thermostat User Manual