Robertshaw C8601 User manual

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 ENERGY 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

DIGITAL

PROGRAMMABLE

THERMOSTAT

C8601

ELECTRIC

GAS

OIL

NeW

HEAT PUMP

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 ther-

mostat. 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 COOLINGCONTROL OR

THE COMMON SIDE OF THE TRANSFORMER. CHECK FURNACE WIRINGDIAGRAM TO

VERIFY C TERMINAL. IF IT IS THE COMMON SIDE OF THE TRANSFORMER, CONNECT TO

THE C TERMINAL.

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

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.

heat off cool

hold

vac

prog

run/sethold

temp

clock

set

auto on

MON

select set

heat off cool

hold

vac

prog

run/set hold

temp

clock

set

auto on

MON

heat off cool auto on

Figure 2

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

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.

GOB Y1W1

MON

Mounting Holes

ELECTRIC/GAS SWITCH

Selects fan control.

HP OPTION SWITCH

Heat pump switch.

Figure 3

110-1103B.qxd 3/14/05 2:31 PM Page 4

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.

Hot

Heating

Control

Cooling

Control

Transformer T

24 VAC

120 VAC

Hot

Heating

Control

Fan

Control

Transformer

24 VAC

120 VAC

Hot

Heating

Control

Transformer

24 VAC

120 VAC

HEAT/COOL

4-WIRE

SINGLE TRANSFORMER

HEAT ONLY

2-WIRE

SINGLE TRANSFORMER

HEAT ONLY

SINGLE TRANSFORMER

3-WIRE

Hot

Cooling

Control

Fan

Control

Transformer

24 VAC

120 VAC

COOL ONLY

3-WIRE

SINGLE TRANSFORMER

Hot

Compressor

Contactor

Transformer

24 VAC

120 VAC

HEAT PUMP WITH

COOL ACTIVE

REVERSING VALVE

Hot

Transformer

24 VAC

120 VAC

HEAT PUMP WITH

HEAT ACTIVE

REVERSING VALVE

NOTE: Make sure the HP switch is in the HP position.

When switched to HP mode,

W1 is connected internally to Y1.

NOTE: Make sure the HP switch is in the HP position.

When switched to HP mode,

W1 is connected internally to Y1.

Reversing

Valve

Fan

Relay

Compressor

Contactor Y1

Reversing

Valve

Fan

Relay

Fan

Control

110-1103B.qxd 3/14/05 2:31 PM Page 5

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 CONDITIONINGSYSTEM AND CAUSE PER-

SONAL 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

TURNINGON 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

auto on

110-1103B.qxd 3/14/05 2:31 PM Page 6

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 dis-

played 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.

MON = MONDAY

TUE = TUESDAY

WED = WEDNESDAY

THU = THURSDAY

FRI = FRIDAY

SAT = SATURDAY

SUN = SUNDAY

select set

heat off cool

hold

vac

prog

run/set hold

temp

clock

set

auto on

MON

select set

hold

vac

prog

run/set hold

temp

clock

set

o on

Cursor

110-1103B.qxd 3/14/05 2:31 PM Page 7

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 Fshould 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 set-

ting will be blinking in the lower left cor-

ner. 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.

110-1103B.qxd 3/14/05 2:31 PM Page 8

Begin Programmed Operation

1. Make sure the cursor is above RUN/SET PROG.

2. Place AUTO–ON switch into AUTO.

3. Place HEAT-OFF-COOL switch into COOL or HEAT depending on

the season.

Temporary Program Hold

You can temporarily increase or decrease the temperature and hold it for

3 hours or until the next program event, whichever comes first.

1. Press the or button. The temperature will blink. Using the

or button, adjust the temperature to the desired level.

2. Press SET.

Another way to select a temporary hold is:

1. Press SELECT until the cursor is over TEMP HOLD. Press SET.

The temperature will be blinking. Use the or button to change

the temperature.

2. Press SET.

To cancel a temporary hold, press SELECT until the cursor is above

RUN/SET PROG. Press SET.

Vacation Hold

You can set your thermostat to hold a desired temperature for 1-365 days.

Vacation hold terminates at midnight of the last day. The thermostat

returns to normal operation the next day at 12:01 AM.

1. Press SELECT until the cursor is over VAC HOLD. Press SET. The

temperature will be blinking. Use the or button to change the

temperature.

2. Press SET. 7d will be displayed. Use the or button to adjust

between 1 and 365 days.

3. Press SET.

To cancel a vacation hold, press SELECT until the cursor is above

RUN/SET PROG. Press SET.

select set

heat off cool

hold

vac

prog

run/set hold

temp

clock

set

auto on

MON

heat off cool auto on

select

hold

vac

prog

run/set hold

temp

clo

110-1103B.qxd 3/14/05 2:31 PM Page 9

Check Filter Reset

Once the filter timer has expired,

CHECK FILTER will turn on and stay

on. To clear the message and reset

the timer:

1. Press SELECT and SET and hold

for 3 seconds. CLr will appear in

the time display.

2. Press any key to clear the message.

The display will transition to the tem-

perature scale display. See step 4 in

CUSTOMIZING YOUR THERMOSTAT.

3. No further input is needed. Within a few seconds, the display will

return to the normal operating mode.

Backlit Display

This thermostat is equipped with a backlight to make night time temper-

ature adjustments quick and easy. Press the button to activate the

backlight. The backlight will turn off after about 10 seconds of inactivity.

Reset

The RESET button is located above the upper left corner of the display.

Only use the reset feature if the thermostat is malfunctioning.

GOB Y1W1

MON

RESET

BUTTON

110-1103B.qxd 3/14/05 2:31 PM Page 10

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