Robertshaw 8625 User manual

Application

The Robertshaw 8625 is a multi-stage thermostat designed to control

24 VAC heat pump systems.

Features

• Large back lit display.

• Four preprogrammed ENERGY STAR®setpoints for each day of the week.

• Adjustable 1st stage temperature differential: 1.0°F to 3.0°F (0.5°C to

1.5°C).

• Adjustable 2nd stage temperature differential: 1.0°F to 6.0°F (0.5°C to

3.0°C).

• Adjustable 2nd stage delay (10-40 minutes).

• Energy Efficient Recovery (EER™).

• Residual cooling for added air conditioning efficiency.

• Zone compatible as master thermostat.

• Fahrenheit/Celsius display option.

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

• Accuracy within ± 1 degree.

• Separate heating and cooling programs.

110-1101

5 - 2 Day Programmable

2 Heat / 2 Cool

User’s Manual

Quick Start

Installation and

Programming

DIGITAL

PROGRAMMABLE

THERMOSTAT

862

ELECTRIC

GAS

OIL

NeW HEAT PUMP

As an ENERGY STAR®partner, Climate Controls Americas has determined

that this thermostat product meets the ENERGY STAR®guidelines for

energy efficiency.

110-1101 7/22/04 8:16 AM Page 1

IMPORTANT SAFETY INFORMATION WARNING:

• Always turn off power at main fuse or circuit breaker panel before

installing, removing, cleaning, or servicing thermostat.

• Read all the information in this manual before installing this thermostat.

• DO NOT CONNECT TO 120 VAC. This is a 24 VAC low-voltage

thermostat. Do not install on voltages higher than 30 VAC.

• 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 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

Step 1: Replacing Existing Thermostat

Wiring Table

Old Terminal New Label Description

R, V-VR or VR-R R 24VAC, return

Y, Y1, M Y1 Compressor relay (Stage 1)

O or R O Reversing valve (cool active)

B B Reversing valve (heat active)

F or G G Fan control relay

Y2 Y2 2nd stage cooling circuit

W2, W-U or E W2/E 2nd stage heating control or

emergency heating for heat pumps

C, X or B C 24 VAC, transformer common side

L or X L System monitor

W or W1 W1 1st stage heat - non heat pump

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.

110-1101 7/22/04 8:16 AM Page 2

IMPORTANT SAFETY INFORMATION 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. Connect AUX heat to the W2/E terminal.

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 8625 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 EMER-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

emer heat off cool

hold

vaca

prog

run/set hold

temp

clock

set

auto on

MON

emer heat off cool auto on

MON

Figure 2

110-1101 7/22/04 8:16 AM 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.

MON

W2/E

GOB Y1W1

Mounting Holes

ELECTRIC/GAS SWITCH

Selects fan control.

HP OPTION SWITCH

Heat pump switch.

Figure 3

110-1101 7/22/04 8:16 AM 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: When switched to HP mode,

W1 is connected internally to Y1.

NOTE: When switched to HP mode,

W1 is connected internally to Y1.

Reversing

Valve

Fan

Relay

Compressor

Contactor Y1

Reversing

Valve

Fan

Relay

Fan

Control

Hot

Transformer

24 VAC

120 VAC

HEAT PUMP + AUX HEAT

HEAT ACTIVE

REVERSING VALVE

NOTE: When switched to HP mode,

W1 is connected internally to Y1.

W2/E

HEAT PUMP + AUX COOL

COOL ACTIVE

REVERSING VALVE

Compressor

(24VAC)

Fault Output

Compressor

Contactor

Aux/Emer

Heat

Second

Stage Cool

Fan

Control

Reversing

Valve

Hot

Transformer

24 VAC

120 VAC

NOTE: When switched to HP mode,

W1 is connected internally to Y1.

W2/E

Compressor

(24VAC)

Fault Output

Compressor

Contactor

Aux/Emer

Heat

Second

Stage Cool

Fan

Control

Reversing

Valve

HEAT/COOL

2 STAGE

Hot

Transformer

24 VAC

120 VAC

W2/E

First Stage

Cool

First Stage

Heat

Second

Stage Heat

Second

Stage Cool

Fan

Control

W2/E

HEAT PUMP WIRING DIAGRAMS

110-1101 7/22/04 8:16 AM 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 IF THE TEMPERATURE

IS BELOW 50°F (10°C). THIS CAN DAMAGE THE AIR

CONDITIONING SYSTEM AND CAUSE PERSONAL INJURY.

1. Place the EMER-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 EMER-HEAT-OFF-COOL switch into the

OFF position. The air conditioning system

should turn off.

4. Put the EMER-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 EMER-HEAT-OFF-COOL switch into the

EMER position. The will be displayed.

7. Press the button until the temperature

setting is at least 3 degrees above room

temperature. The secondary heating system should turn on.

NOTE: The compressor will not turn when in emergency heat mode.

8. Put the EMER-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.

9. Put the AUTO-ON switch into the ON position.

The blower fan should turn on. The display will

show a .

10. Put the AUTO-ON switch into the AUTO position.

The blower fan should turn off.

emer heat off cool

auto on

emer heat off cool

110-1101 7/22/04 8:16 AM 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 8625 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.

MON = MONDAY

TUE = TUESDAY

WED = WEDNESDAY

THU = THURSDAY

FRI = FRIDAY

SAT = SATURDAY

SUN = SUNDAY

select set

emer heat off cool

hold

vaca

prog

run/set hold

temp

clock

set

auto on

MON

select set

hold

vaca

prog

run/set hold

temp

clock

set

o on

Cursor

110-1101 7/22/04 8:16 AM 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 THE THERMOSTAT

Settings

System

Cool: The thermostat controls the cooling.

Off: The heating and cooling systems are off.

Heat: The thermostat controls the heat.

Emer: The thermostat controls the second stage emergency heat. Use

only when the primary stage of heat is not functioning or requires

service. The display will show CHECK HP

when the heat pump requires service.

Fan

Auto: Equipment controls the fan.

On: The fan operates continuously.

Temperature Differential

The temperature differential for 1st stage 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 sys-

tem turns on too often, increase the temperature differential.

NOTE: The temperature differential for 2nd stage is factory set at

2.0°F (1.0°C)

Changing Fahrenheit (°F) to Celsius (°C), Clock Setting, Temperature

Differential, and Filter Monitor

1. The thermostat is preset to display the

temperature in degrees Fahrenheit (US

models) or degrees Celsius (Canadian

models). The temperature display can be

changed. Press and hold both the

SELECT and SET buttons for three seconds. The display will flash

either an For C. Release buttons. Press the or button to switch

the display.

2. Press SET. The display will switch to the clock setting.

3. The display will read CLOC. Use the

or button to toggle between 12 or 24

for the clock setting.

4. Press SET. The display will switch to the

differential setting for 1st stage heating

and cooling.

5. The display will read diFF.

Press the or button to adjust the

differential up or down.

110-1101 7/22/04 8:16 AM Page 8

6. Press SET. The display will switch to the differential setting for 2nd

stage heating and cooling.

7. The display will read diF2. Press the

or button to adjust the differential up

or down.

8. Press SET. The display will switch to the

differential delay.

9. The display will read dLY2.

The differential delay is the length of time

(in minutes) from when the 1st stage

engages, until the 2nd stage engages to

assist in heating or cooling. Press the

or button to adjust the delay up or down.

10. Press SET. The display will switch to the Energy Efficient

Recovery (EER™) setting.

11. The display will read EER. When turned

on, the thermostat will look ahead to

determine when to turn on the

heating/cooling system in order to reach

the desired temperature at the desired

time. Press the or button to turn EER on or off.

12. Press SET. The display will switch to the filter monitor setting.

13. CHECK FILTER and the length of hours for

the filter monitor will be displayed.

14. Use the or to adjust the filter timer

from 0 (OFF) to 9900 hours. NOTE: The

filter timer is based on equipment run

time. Select the length of time based on the recommended service

interval for your filter.

15. Press SET to return to normal operation.

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.

select set

emer heat off cool

hold

vaca

prog

run/set hold

temp

clock

set

auto on

MON

emer heat off cool auto on

MON

select

hold

vaca

prog

run/set hold

temp

cloc

110-1101 7/22/04 8:16 AM Page 9

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.

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.

Reset

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

Only use the reset feature if the thermostat is malfunctioning.

MON

W2/E

GOB Y1W1

RESET

BUTTON

110-1101 7/22/04 8:16 AM Page 10

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