Pentax RTH8500 Quick Installation Guide
Quick Installation Guide
RTH8500 Series
Touchscreen Programmable Thermostat
69-2219EF-03
Installation is Easy
Label wires and remove your old thermostat
Install and wire your new thermostat
Set your new thermostat to match your heating/cooling
system
– This thermostat works with virtually all System
Types
– It is preset for the most common system
We are here to help.
Call 1-800-468-1502 for wiring
assistance before returning the
thermostat to the store.
69 -2219 EF—0 3 ii
Turn Off Power to Heating/
1
Cooling System
M28097
1 69-2219EF—03
Remove Old Thermostat
2
Remove old thermostat but leave wallplate with
wires attached.
Is there a sealed tube containing
Leave wallplate
in place
Old thermostat
mercury? If so, see back cover
for proper disposal instructions.
Cover
M28099
69 -2219 EF—0 3 2
Label Wires with Tags
3
Label the wires using the supplied wire labels as you
disconnect them.
Wire Labels
M28093
3 69-2219EF—03
M28100
Separate Wallplate from
4
New Thermostat
Remove wallplate from the new thermostat and mount
onto wall.
+
+
+
Wallplate
M28334
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Mount Wallplate
5
Mount the new wallplate using the included screws
and anchors.
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
M27514
5 69-2219EF—03
Connect Wires
SCREW
6
Simply match wire labels.
THEN TIGHTEN SCREWS
CONVENTIONAL
Y2
W2
INSERT WIRES
LABELED WIRES
WIRE HOLE
CONVENTIONAL
R
W
Y
G
Remove metal jumper if you have both R and Rc wires.
Labels don’t match? See page 21.
Have a Heat Pump system? See pages 22–23.
We are here to help.
Call 1-800-468-1502 for wiring assistance.
69 -2219 EF—0 3 6
RC
R
W
Y
G
C
M27515
Install Batteries
7
Install three AAA alkaline batteries and remove tab.
Back of thermostat
Remove tab.
M28335
M28336
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Install Thermostat onto Wallplate
8
Install thermostat onto the wallplate on the wall.
M28337
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Turn Power Back On
9
Turn the power back on to the heating/cooling system.
M28098
9 69-2219EF—03
6
10
Set Time and Date
Press s/t
to set date
Press s/t
to set month
Press s/t
to set year
DONE
Press DONE to save changes
Press s/t
to set time
DONE
Press DONE to save and exit
TUE
2006
TUE
1:00
15
6
M28338
PM
M28339
69 -2219 EF—0 3 10
11
If your system type is...
If your system type is:
q Single Stage Heat and Cool
Congratulations, you’re done!
If your system type is:
q Multistage Heat and Cool
q Heat Pump* without Backup Heat
q Heat Pump* with Backup Heat
q Heat Only
q Cool Only
Continue with advanced installation
on next page to match your thermostat to your system type.
*Heat Pump—an air conditioner that provides cooling
in the summer, and also runs in reverse in the winter to
provide heating.
If you are not sure of your system type or if you have
other questions, call us toll-free at 1-800-468-1502.
This thermostat works on 24 volt or 750 mV systems. It
will NOT work on 120/240 Volt systems.
11 69-2219EF—03
Advanced Installation
System setup ......................................................................................13
Wiring ................................................................................................. 21
Troubleshooting ..................................................................................24
Customer assistance .......................................................................... 26
Limited warranty ................................................................................27
About your new thermostat
SCREEN MORE
Following
Schedule
Outside
Set To
70
43
TUE
Inside
Set To
70
70
FAN
AUTO
System setup
1. Press SYSTEM.
FAN
Inside
AUTO
SYSTEM
HEAT
SCHED HOLD
2. Press and hold blank center key until the
screen changes (approximately 5 seconds).
SYSTEM
HEAT
DONE CANCEL
6:01
AM
TUE
70
6:01
M28340
M28341
RTH8500
SETUP WIRING ASSISTANCE TROUBLESHOOTING
AM
13 69-2219EF—03
Advanced Installation Guide
TUE
Inside
Set To
70
70
FAN
AUTO
About your new thermostat
Changing settings
See pages 15–20 to change Function Settings.
Function Setting
SETUPWIRINGASSISTANCETROUBLESHOOTING
0120
DONE
Press s/t to
select function
3. Press DONE to exit & save changes.
NOTE: Some functions in the following pages
may not appear due to previous selections
made.
69 - 2219E F— 0 3 14
20
M28341
Press s/t to
change setting
About your new thermostat
System setup
NOTE: If you set the time and date as shown on page 10,
press NEXT to function 0170 and go to page 16.
See page 14 to navigate between functions.
Function Settings & Options
0120 Year Setting
(rst two
digits)
0130 Year Setting
(second two
digits)
0140 Month Setting
0150 Date Setting
Press s/t to change the rst two
digits of the year:
20 = Year 20xx
21 = Year 21xx
Press s/t to change the last two
digits of the year:
01 - 99 (i.e., 2001 - 2099)
Press s/t to change the current
month:
01 - 12 (i.e., January - December)
Press s/t to change the current
date:
01 - 31
RTH8500
SETUP WIRING ASSISTANCE TROUBLESHOOTING
15 69-2219EF—03
Advanced Installation Guide
About your new thermostat
System setup
See page 14 to navigate between functions.
Function Settings & Options
0170 Select System
SETUPWIRINGASSISTANCETROUBLESHOOTING
Type
Press s/t to select your system
type:
1 Heat/cool: Gas, oil or electric
heating with central air conditioning.
2 Heat pump: Heat pump with-
out backup or auxiliary heat.
3 Heat only: Gas, oil or electric
heat without central air conditioning.
4 Heat only with fan: Gas, oil or
electric heat without central air
conditioning.
5 Hot water heat only (no fan):
Gas, oil or hot water heat without central air conditioning.
6 Cool only: Central air condi-
tioning only.
7 Heat pump: Heat pump with
backup or auxiliary heating.
8 Heat/Cool Multiple stages:
2 heat stages (wires on W and
W2), 2 cooling stages (wires on
Y and Y2).
9 Heat/Cool Multiple stages:
2 heat stages (wires on W and
W2), 1 cooling stage (wire on
Y).
10 Heat/Cool Multiple stages: 1
heat stage (wire on W), 2 cooling stages (wires on Y and Y2).
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