Recycling thermostat, Figure 3, Figure 2 – Robertshaw 9420 User Manual

Page 3

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 ques-
tions, call Robertshaw technical support at 1-800-445-8299.

Step 2: Installing Model 9420 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 and cooling systems.

2. Place EMER-HEAT-OFF-COOL 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.

Figure 3

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 current

room temperature 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
1

and 2

stages respectively. The dead band for Auto-

changeover 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 1

2. Press either the

ٚ or ٙ button to adjust the 1st stage differ-

ential 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 2

4. Press either the

ٚ or ٙ button to adjust 2nd stage differen-

tial 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.

Item

9555

120-1523

Maple Chase Company

www.maplechase.com

Tech Service: 1-800-445-8299

M-F 7:30 a.m. - 5:30 p.m. CST

MADE IN MEXICO

Figure 2