Robertshaw C8601 User Manual

1

Application

The Robertshaw C8601 is a single-stage thermostat designed to control
24 VAC gas or electric heating and cooling systems or single-stage
heat pump. The C8601 requires a common wire.

Features

• Large backlit display.

• Four preprogrammed E

NERGY STAR

®

setpoints for each day of

the week.

• Fahrenheit/Celsius display option.

• Programmable from 45°F (4°C) to 90°F (32°C).

• Accuracy within ± 1 degree.

• Adjustable temperature differential: 1-3 °F (1-1.5°C).

• Separate heating and cooling programs.

110-1103B

5 - 2 Day Programmable
1 Heat / 1 Cool

User’s Manual

Quick Start
Installation and
Programming

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DIGITAL
PROGRAMMABLE
THERMOSTAT

C8601

ELECTRIC

E

GAS

G

OIL

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®

NeW

HEAT PUMP

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As an ENERGY STAR®partner, Invensys Controls Americas has determined
that this thermostat product meets the ENERGY STAR®guidelines for
energy efficiency.

110-1103B.qxd 3/14/05 2:31 PM Page 1

WARNING:

•

Always turn off power at the main power source by 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.

•

DO NOT CONNECT TO 120 VAC. 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.

•

Do not connect ground to any terminal in this unit.

Recycling Thermostat

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 Controls Americas or a local recycling center for proper
disposal. If you have any questions, call Robertshaw technical
support at 1-800-445-8299.

Invensys Controls Americas

3505 Laird Road – Unit #14
Mississauga, Ontario L5L 5Y7
Attn: Mercury Recycling Center

Replacing Existing Thermostat

Wiring Table

Old Label New Label Description

M, W, Rh, Rc R 24VAC, hot side
R5, V or 5

C, X or B C 24VAC, common side
Y or Y6 Y1 Cooling control
H, W or 4 W1 Heating control
F or G G Fan control relay
O O Cool active reversing valve
B B Heat active reversing valve

NOTE: THIS THERMOSTAT REQUIRES A 24 VAC COMMON WIRE FOR PROPER OPERATION.
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, CONNECT TO
THE C TERMINAL.

2

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WARNING:

In heat pump applications, do not connect anything to the W1
terminal. When switched to HP mode, W1 is connected internally
to Y1 on the thermostat.

1. Turn off power to heating and cooling system.

2. Remove cover of old thermostat to expose wires. Do not
disconnect wires. (See Figure 1)

3. Label wires per the Wiring Table.

4. After labeling wires, remove wires from terminals.

5. Remove existing thermostat base from wall.

6. Refer to the following section for instructions on how to
install thermostat.

Figure 1

Installing Item C8601 Thermostat

NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON AN INSIDE WALL, 4-5 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 PLACES WILL AFFECT THERMOSTAT OPERATION

.

1. Turn power off to the heating and cooling systems.

2. Place HEAT-OFF-COOL in OFF position.

3. Place AUTO–ON switch
into AUTO position.

4. Remove the cover using a coin
or screwdriver (see Figure 2).

5. Place thermostat against the
wall at desired location. Make
sure wires will feed through
opening on base of thermostat.

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F

select

set

heat off cool

auto on

Figure 2

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110-1103B.qxd 3/14/05 2:31 PM Page 3

heat off cool

MON

temp

run/set

hold

prog

select

auto on

°

F

set

vac

clock

hold

set

6. Mark placement of mounting holes (see Figure 3). Set base aside.

7. Drill the marked holes using a 3/16” (5mm) drill bit. NOTE: Enclosed
plastic anchors do not require a drilled hole for drywall.

8. Tap plastic anchors into the wall.

9. Align base with plastic anchors and feed wires through opening
(see Figure 3).

10. Secure base to wall with supplied screws.

11. Connect wires to terminal strip. Refer to wiring diagrams on page 5.
Make sure wire connections are secure.

12. Place Electric/Gas switch into either the ELEC or GAS position
depending on the type of furnace (see Figure 3).

13. Place the HP option switch into either the NON_HP or HP position
depending on the type of system you are using (see Figure 3). Use
the HP position for heat pumps ONLY. Use the NON_HP setting for
everything else.

14. Replace cover on thermostat by snapping into place.

15. Turn on power to system. Test thermostat as described in the
section To Test Thermostat.

4

Mounting Holes

ELECTRIC/GAS SWITCH
Selects fan control.

HP OPTION SWITCH
Heat pump switch.

Figure 3

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MON

C

R

GOB Y1W1

°

F

Wiring Diagrams

The following is just a sample of the most common types of HVAC
systems. Refer to your system’s installation manual for wiring information.

5

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HEAT/COOL

4-WIRE

SINGLE TRANSFORMER

R

T
H

C

E
R

W1

M
O

Y1

S
T

G

A
T

O

B

120 VAC

Transformer

Hot

24 VAC

Heating
Control

Cooling
Control

Fan

Control

HEAT ONLY

2-WIRE

SINGLE TRANSFORMER

120 VAC

Transformer

Hot

24 VAC

Heating
Control

R

T

C

H
E

W1

R

Y1

M
O

G

S
T

O

A
T

B

HEAT ONLY

3-WIRE

SINGLE TRANSFORMER

120 VAC

Transformer

Hot

24 VAC

Heating
Control

Fan

Control

R

C

W1

Y1

G

O

B

COOL ONLY

3-WIRE

SINGLE TRANSFORMER

Cooling
Control

Fan

Control

R

C

W1

Y1

G

O

B

120 VAC

Transformer

Hot

24 VAC

T
H
E
R
M
O
S

T
A

T

T

H

E

R
M
O
S

T
A

T

HEAT PUMP WITH

COOL ACTIVE

REVERSING VALVE

Transformer

Hot

120 VAC

24 VAC

Compressor

Contactor

Fan

Relay

Reversing

Valve

NOTE: Make sure the HP switch is in the HP position.
When switched to HP mode,
W1 is connected internally to Y1.

HEAT PUMP WITH

HEAT ACTIVE

REVERSING VALVE

R

T

C

H
E

W1

R
M

Y1

O

G

S

120 VAC

Transformer

Hot

24 VAC

T
A

O

T

B

NOTE: Make sure the HP switch is in the HP position.
When switched to HP mode,
W1 is connected internally to Y1.

Compressor

Contactor

Fan

Relay

Reversing

Valve

R

T

C

H
E

W1

R

M

Y1

O

G

S

T

A

O

T

B

6

To Test 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.

CAUTION: DO NOT SWITCH SYSTEM TO COOL OR LEAVE IN COOL MODE

IF THE TEMPERATURE IS BELOW 50°F (10°C). THIS CAN
DAMAGE THE AIR CONDITIONING SYSTEM AND CAUSE PER­SONAL INJURY.

1. Place the HEAT-OFF-COOL switch into the
COOL position. The will be displayed.

2. Press the button until the temperature
setting is at least 3 degrees below the room
temperature. The air conditioning system
should turn on within a few seconds.

NOTE: ONCE THE THERMOSTAT TURNS OFF WHEN IN THE COOL MODE,

A BUILT IN 5-MINUTE DELAY PREVENTS THE SYSTEM FROM
TURNING ON AGAIN. THIS PROTECTS THE COMPRESSOR. NO
ADDITIONAL TIME DELAY RELAY IS REQUIRED. TO OVERRIDE THE
5-MINUTE DELAY FOR INSTALLATION, PRESS THE RESET BUTTON.

3. Put the HEAT-OFF-COOL switch into the OFF
position. The air conditioning system should
turn off.

4. Put the HEAT-OFF-COOL switch into the HEAT
position. The will be displayed.

5. 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.

NOTE: If HP is selected, the heat will not come on until the 5 minute

short cycle protection has expired.

6. Put the HEAT-OFF-COOL switch into the OFF
position. The heating system should turn off.
The fan may continue to run for a short
period of time.

7. Put the AUTO-ON switch into the ON
position. The blower fan should turn on.
The display will show a .

8. Put the AUTO-ON switch into the AUTO
position. The blower fan should turn off.

heat off cool

heat off cool

heat off cool

heat off cool

auto on

auto on

!

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Programming Guide

SETTING TIME OF DAY AND
DAY OF WEEK

1. Press SELECT until the cursor is
over SET CLOCK. Press SET. The
HOURS segment will be blinking.
Use the or button to adjust
the time. NOTE: The AM or PM
indicator will change as the
HOURS display rolls through a 24
hour cycle.

2. Press SET. The MINUTES segment will be blinking. Use the or
button to adjust the MINUTES setting.

3. Press SET. The DAY segment will be blinking at the top of the
display. Use the or button to adjust the day of the week.
Press SET.

PROGRAMMING YOUR THERMOSTAT

The C8601 thermostat features 1-button programming. Simply follow
these steps to customize your thermostat for your lifestyle.

1. Place the HEAT-OFF-COOL switch into the
HEAT position. Make sure the cursor is in
the RUN/SET PROG position. Press SET.
The HOURS segment will be blinking.
MON thru FRI (the work week) will be dis­played across the top. AM1 will be illuminated in the lower right
hand corner. You can now start programming the first event of the
work week.

2. Use the or button to adjust the hour of the first event. Press SET.

3. The MINUTES segment will be blinking. Use the or button to
adjust the minutes. Press SET.

4. The temperature should be blinking. Use the or button to
adjust the desired temperature of the first event. Press SET.

5. AM2 should now be displayed. Repeat
steps 2-4 to program the remaining events
(PM1 and PM2) for the work week. There
are a total of 4 events.

7

MON = MONDAY
TUE = TUESDAY
WED = WEDNESDAY
THU = THURSDAY
FRI = FRIDAY
SAT = SATURDAY
SUN = SUNDAY

select

set

hold

vac

prog

run/set

hold

temp

clock

set

Cursor

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heat off cool

MON

set

temp

vac

run/set

prog

select

clock

hold

hold

auto on

°

F

set

6. After pressing SET for the 4th event, the
day of the week along the top will switch
to SAT SUN and AM1 will be displayed.
Repeat steps 2-4 to program the
weekend settings.

7. With the weekend settings programmed, place the HEAT-OFF-COOL
switch in the COOL position. Repeat steps 2-6 to program the
cooling settings.

CUSTOMIZING YOUR THERMOSTAT

Settings

System

Cool: The thermostat controls the cooling.
Off: The heating and cooling systems are off.
Heat: The thermostat controls the heat.

Fan

Auto: Equipment controls the fan.
On: The fan operates continuously.

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), Clock Setting, Temperature
Differential, and Filter Monitor

You can change temperature scales (F or C), set a 12 or 24 hour clock,
adjust differentials and change the filter monitor setting by following
these instructions.

1. Press SELECT and SET at the same time.
Hold for 3 seconds. An F should be
blinking in the display. Use the or
button to toggle between Farhenheit (F)
or Celsius (C).

2. Press SET. CLOC will be displayed in the
lower left corner. Use the or
button to toggle between 12 or 24 for the
clock setting.

3. Press SET. diFF will be displayed in the
lower left corner. Use the or
button to adjust the 1st stage differential
between 1°F and 3°F (1°C and 1.5°C).

4. Press SET. CHECK FILTER will be
displayed and the length of the filter set­ting will be blinking in the lower left cor­ner. Use the or button to adjust the
filter setting from 0 (OFF) to 9900 hours.
NOTE: The filter timer is based on
equipment run time. Select the length of time based on your filter's
recommended service interval.

5. Press SET or wait 5 seconds and the thermostat will return to the
normal operating mode.

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