Robertshaw 8625 User manual

1
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
W
A
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R
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T
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A
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DIGITAL
PROGRAMMABLE
THERMOSTAT
862
5
ELECTRIC
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GAS
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OIL
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NeW HEAT PUMP
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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.
2
!
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.
3
heat off cool
hold
vac
prog
run/sethold
temp
clock
set
auto on
MON
°
F
select set
select set
emer heat off cool
hold
vaca
prog
run/set hold
temp
clock
set
auto on
MON
°
F
emer heat off cool auto on
MON
°
F
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.
4
MON
°
F
R
L
C
Y2
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.
5
Hot
Heating
Control
Cooling
Control
Transformer T
H
E
R
M
O
S
T
A
T
W1
C
R
Y1
G
O
B
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
W1
Y1
G
W1
Y1
G
W1
Y1
G
Hot
Compressor
Contactor
Transformer
24 VAC
120 VAC
HEAT PUMP WITH
COOL ACTIVE
REVERSING VALVE
W1
Y1
B
G
O
Hot
Transformer
24 VAC
120 VAC
HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
W1
T
H
E
R
M
O
S
T
A
T
T
H
E
R
M
O
S
T
A
T
T
H
E
R
M
O
S
T
A
T
T
H
E
R
M
O
S
T
A
T
T
H
E
R
M
O
S
T
A
T
NOTE: When switched to HP mode,
W1 is connected internally to Y1.
NOTE: When switched to HP mode,
W1 is connected internally to Y1.
O
B
O
B
O
B
Reversing
Valve
Fan
Relay
Compressor
Contactor Y1
G
O
B
Reversing
Valve
Fan
Relay
Fan
Control
C
R
C
R
C
R
C
R
C
R
Hot
Transformer
24 VAC
120 VAC
HEAT PUMP + AUX HEAT
HEAT ACTIVE
REVERSING VALVE
T
H
E
R
M
O
S
T
A
T
NOTE: When switched to HP mode,
W1 is connected internally to Y1.
R
C
L
W1
Y1
B
O
G
Y2
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
T
H
E
R
M
O
S
T
A
T
NOTE: When switched to HP mode,
W1 is connected internally to Y1.
R
C
L
W1
Y1
B
O
G
Y2
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
T
H
E
R
M
O
S
T
A
T
R
C
L
W1
Y1
B
O
G
Y2
W2/E
First Stage
Cool
First Stage
Heat
Second
Stage Heat
Second
Stage Cool
Fan
Control
Y2
W2/E
Y2
W2/E
Y2
W2/E
Y2
W2/E
Y2
W2/E
Y2
W2/E
HEAT PUMP WIRING DIAGRAMS
110-1101 7/22/04 8:16 AM Page 5

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 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
emer heat off cool
emer heat off cool
emer heat off cool
auto on
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.
7
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
°
F
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.
8
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.
9
select set
emer heat off cool
hold
vaca
prog
run/set hold
temp
clock
set
auto on
MON
°
F
emer heat off cool auto on
MON
°
F
select
hold
vaca
prog
run/set hold
temp
cloc
se
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.
10
MON
°
F
R
L
C
Y2
W2/E
GOB Y1W1
RESET
BUTTON
110-1101 7/22/04 8:16 AM Page 10

Troubleshooting
Symptom Remedy
Thermostat does not turn Check wiring.
on system. (See Installing Item 8625
Thermostat)
Thermostat turns on and off too Increase temperature differential.
frequently. (See Programming Guide)
System fan does not operate Move the Electric/Gas switch to
properly. either gas or electric, to match
system. (See Installing Item
8625 Thermostat)
Time shown on display is not the Change time of day setting.
current time of day. (See Programming Guide)
Thermostat does not Thermostat may not have been
follow program. programmed in HEAT or COOL
position. Verify program.
Check AM/PM indicators at time
of day and programmed time
changes.
(See Programming Guide)
Verify program and day of week
are correct.
(See Programming Guide)
If problems with thermostat cannot be resolved, call:
Technical Support: [phone]
Monday-Friday 7:30-5:30 CST
For after hours service, a 24-hour
automated help line is available.
For warranty returns, send thermostat, shipping prepaid to:
Climate Controls Americas
Warranty Department
515 South Promenade Avenue
Corona, CA 91719
11
110-1101 7/22/04 8:16 AM Page 11

12
©2004 Climate Controls Americas 110-1101
Climate Controls Americas
191 E. North Avenue
Carol Stream, Illinois 60188
United States of America
TWO-YEAR LIMITED WARRANTY
Climate Controls Americas warrants to the original contractor
installer or to the original consumer user, each new Robertshaw thermo-
stat to be free from defects in materials and workmanship under normal
use and service for a period of two (2) years from date of purchase. This
warranty and our liability does not apply to batteries or merchandise that
has been damaged by misuse, neglect, mishandling, alterations, improper
installation, or use in a way other than in accordance with Climate
Controls Americas recommendations and instructions.
Climate Controls Americas agrees to repair or replace at its option
any thermostat under warranty provided it is returned within the warranty
period, postage prepaid, with proof of the date of purchase. Cost of ther-
mostat removal or reinstallation is not the responsibility of Climate
Controls Americas.
Repair or replacement as provided under this warranty is the exclusive
remedy of the consumer. Climate Controls Americas shall not be liable
for any incidental or consequential damages for breach of any express or
implied warranty on this product, or under any other theory of liability.
Except to the extent prohibited by applicable law, any implied warranty of
merchantability or fitness for a particular purpose on this product is limit-
ed to the duration of this warranty.
Some states do not allow the exclusion or limitation of incidental or con-
sequential damages, or allow limitations on how long an implied warranty
lasts, so the above limitations or exclusions may not apply to you. This
warranty gives you specific legal rights, and you may also have other
rights which vary from state to state.
110-1101 7/22/04 8:16 AM Page 12