Robertshaw 9405 User Manual

DIGITAL
NON-PROGRAMMABLE
THERMOSTAT

9405

ELECTRIC

E

GAS

G

MILLIVOLT

M

®

NeW

1 Heat

User's Manual

Quick Start
Installation

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 1.5°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 temperature drops to 40°F (4°C)
even if batteries are missing or drained.

• Automatic heating shutdown if temperature exceeds 94°F (34°C)

1

110-1042

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.

• 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.

• Do not connect ground to any terminal in this unit.

Step 1: Replacing Existing Thermostat

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 Table 1 if existing wiring
does not directly match the labels.

4. 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

NOTE: ON SOME OLDER MODELS, THE C TERMINAL CAN BE EITHER THE COOLING CONTROL

OR THE COMMON SIDE OF THE TRANSFORMER. CHECK FURNACE WIRING DIAGRAM
TO VERIFY C TERMINAL. IF IT IS THE COMMON SIDE OF THE TRANSFORMER, CAP
THE WIRE AND TUCK INTO THE WALL.

Table 1

2

Figure 1

!

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. DO NOT
INSTALL BEHIND A DOOR, IN A CORNER, NEAR AIR
VENTS, IN DIRECT SUNLIGHT, OR NEAR ANY HEAT OR
STEAM GENERATING FIXTURES. INSTALLATION AT THESE
LOCATIONS WILL AFFECT THERMOSTAT OPERATION.

1. Turn power off to the heating system.

2. Place HEAT-OFF in OFF position (Figure 2).

3. Place -ON-AUTO switch into AUTO position (Figure 2).

4. Remove the cover using a coin or screwdriver (Figure 3). Set aside.

3

Figure 3

Figure 2

Maple Chase Company
www.maplechase.com

TM

Tech Service: 1-800-445-8299
M-F 7:30 a.m. - 5:30 p.m. CST

Item

9555

MADEINMEXICO

SETTING OR CHANGING THE SETPOINT TEMPERATURE:

1.Press or button. Display will show SET and the current
temperature setpoint.

2. Press or button to adjust temperature setpoint.

3. After completing the change, the display will return to the curr

ent

room temperatur

e after a few seconds.

CHANGING THE TEMPERATURE DIFFERENTIAL,
DEAD BAND, AND RESIDUAL COOL:

The temperature differentials are factory set at 1˚F and 2˚F for
1STand 2NDstages respectively. The dead band for Auto­changeover is set at 3˚F. To change settings:

1.Press the and buttons at the same time and hold for 1
second. Display will indicate: DIFFERENTIAL 1ST.

2. Press either the or button to adjust the 1st stage differ­ential between 0.5˚F – 3˚F (0.5˚C - 1.5˚C).

3. Either wait five seconds or press the button. The display

will indicate: DIFFERENTIAL 2ND.

4.Press either the or button to adjust 2nd stage differen­tial between 1˚F – 6˚F (1˚C - 3˚C).

5. Either wait five seconds or press the button. The display

will indicate: DEADBAND.

6.Press either the or button to adjust the dead band
between 3˚F – 6˚F (1.5˚C - 3˚C).

7.Either wait five seconds or press the button.The fan
icon and ON will be displayed.

8. Press either the or button to adjust the Residual Cool
fan delay between 0, 30, 60, or 90 seconds.

9.The display will return to the current room temperature after
a few seconds.

120-1523

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.

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. Align base with plastic anchors and feed wires through opening.

10. Secure base to wall with supplied screws.

NOTE: THE THERMOSTAT WILL MOUNT HORIZONTALLY

ON A SINGLE GANG JUNCTION BOX.

11. Strip end of wires 5/16” if needed.

12. 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.

13. Make sure wire connections are secure.

14. Push excess wire back through opening.

4

Figure 4

W

R

G

Label

G

Figure 5

Mounting Holes

RESET

NON-HP

HP

Wiring Opening

ELECGAS