Robertshaw 800 Data Sheet

For 9801i single stage heat

pump applications, place a jumper
between the E/W1 and Y1 terminals.

Connect wiring between unit and 
furnace. For Model 9815i
(2H/2C furnace applications).

Replace cover on thermostat.
To replace cover, line up top and
bottom edges and push straight in.
DO NOT pivot on upper case clips.
Turn on power to unit and proceed
with programming per instructions on
the display or in the users manual.

Connect wiring between unit and 
heat pump. For Model 9820i (2H/2C
heat pump applications).

To set your name and phone 
number into the thermostat press
MENU, select INSTALLER 
SETTINGS, and CONTACT 
INFORMATION. The screen at the
bottom left should appear.
To enter your name press EDIT.
Use the UP or DOWN button to
scroll through the characters.
(DOWN gets you to the letters
faster.) After each letter press NEXT.
When you are done entering your
name, press ACCEPT.

Connect wiring between the 
thermostat and the indoor sensor
(9020i) and the outdoor sensor
(9025i), if used. Use twisted pair
wiring (22AWG minimum) with 
a maximum length of 300 feet 
(or 100m).

Now enter your phone number.
Use the UP and DOWN arrow to
select the first number. Press NEXT.
When you have completed entering
your phone number, press ACCEPT.

The screen will return to the
INSTALLER SETTINGS. Finish 
setting the thermostat for the 
application.

Thermostat

C

- 24VAC Common

R

- 24VAC

Y1

- 1st stage cooling

E/W1 - 1st stage heating
W2

- 2nd stage heating

Y2

- 2nd stage cooling

L

- Not used

O

- Not used

B

- Not used

G

- Fan

H

- Humidification

D

- Not used

TERMINAL DESIGNATIONS

C

C

H

R

Y1

W1

W2

Y2

G

B

O

Note: To avoid electrical problems, use the system transformer for both

the thermostat and humidifier.

9815

i

Humidifier

Equipment Wiring 
Terminals
Please refer to 
furnace installation 
manual for proper 
terminations.

Thermostat

C   - 24VAC Common
R   - 24VAC
Y1 

-  1st stage heating/cooling

E/W1 -  Emergency heat strip
W2  -  2nd stage heating
Y2 

-  2nd stage cooling

L   

-  System fault indicator

O   

-  Cool active reversing valve

B   

-  Heat active reversing valve

G  

- Fan

H   - Humidification
D   - Not used

TERMINAL DESIGNATIONS

C

C

H

R

Y1

E

W2

Y2

G

L

B

O

Note:  To avoid electrical problems, use the system transformer for both
 

the thermostat and humidifier.

9820

i

Humidifier

Equipment Wiring 
Terminals
Please refer to heat 
pump installation 
manual for proper 
terminations.

If terminal E is not 
supplied, add jumper 
across E/W1 and W2 
on the thermostat.

Thermostat

C

- 24VAC Common

R

- 24VAC

Y1

- 1st stage cooling

E/W1 - 1st stage heating
O

- Cool active reversing valve

B

- Heat active reversing valve

G

- Fan

H

- Humidification

TERMINAL DESIGNATIONS

C

C

H

R

Y

G

B

O

Note: To avoid electrical problems, use the system transformer for both

the thermostat and humidifier.

9801

i

Humidifier

Jumper

Equipment Wiring 
Terminals
Please refer to heat 
pump installation 
manual for proper 
terminations

Controls Americas
515 South Promenade Avenue
Corona CA  92879-1736
United States of America
Made in Mexico
Patents Pending
www.about-i-series.com

If this thermostat REPLACES a thermostat that contains
mercury, DO NOT discard the old thermostat in the regular
trash.  Mercury is harmful to humans and the environment.
For this reason, do not open, break, or crush the mercury cell.
If mercury leaks from a damaged cell, DO NOT touch or handle
mercury with bare hands.  Use protective, non-absorbent
gloves to place mercury into a sealable container.  Fill the
container with sand or another absorbent material and seal
the container completely.

Return the mercury or mercury products, in a sealed container,
to Invensys Climate Controls or a local recycling center for
proper disposal.  If you have any questions, call Robertshaw
technical support at 1-800-445-8299.

Invensys Climate Controls
28C Leigh Fisher Blvd.
El Paso, TX 79906
Attn: Mercury Recycling Center