Robertshaw 8601-1 User Manual

1

Application

The Robertshaw 8601 is a single-stage thermostat designed to control
24 VAC gas or electric heating and cooling systems or single-stage
heat pump. The 8601 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.

110-1098B

5 - 2 Day Programmable
1 Heat / 1 Cool

User’s Manual

Quick Start
Installation and
Programming

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DIGITAL
PROGRAMMABLE
THERMOSTAT

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601

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HEAT PUMP

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

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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
28C Leigh Fisher Blvd.
El Paso, TX 79906
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 8601 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-A/C 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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Figure 2

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temp

prog

hold

select

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F

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set

a/coffheat

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onauto

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

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°

F