Pro 1 IAQ True Comfort T905pro1 Maintenance and service guide

This manual covers the following models:
• T905
INSTALLATION MANUAL
A trained, experienced technician
must install this product.
Carefully read these instructions. You
could damage this product or cause a
hazardous condition if you fail to follow
these instructions.
Need Help?
For assistance with this product please visit
http://www.pro1iaq.com or call Pro1
Customer Care toll-free at 888-Pro1iaq
(776-1427) during normal business hours
(Mon-Fri 9 AM - 6 PM Eastern)
Table of Contents
Thermostat Applications Guide
Page
Battery Power
Hardwire (Common Wire)
Hardwire (Common Wire) with Battery Backup
Power Type
1
noitpircseD
Gas or Oil Heat
Electric Furnace
Heat Pump (No Aux. or Emergency Heat)
Heat Pump (with Aux. or Emergency Heat)
Multi-stage Systems
Heat Only Systems
Cool Only Systems
Millivolt
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Rev. 0850
Una versión española de este
manual puede ser descargada
en www.pro1iaq.com
® U.S. Registered Trademark. Patents pending.
Copyright © 2006 Pro1 IAQ, Inc. All rights reserved.
Installation Tips
Thermostat Quick Reference
Subbase Installation
Wiring
Wiring Diagrams
Technician Setup Menu
Mounting and Battery Installation
Programming The Thermostat
Specifications
2
3
4
5
6
7-9
10
11-13
14

INSTALLATION TIPS
The thermostat should be installed approximately 4 to 5 feet above the floor.
Select an area with average temperature and good air circulation.
Do not install thermostat in locations:
• Close to hot or cold air ducts
• That are in direct sunlight
• With an outside wall behind the thermostat
• In areas that do not require conditioning
• Where there are dead spots or drafts (in corners or behind doors)
• Where there might be concealed chimneys or pipes
Pick an installation location that is easy for the user to access. The temperature of the location
should be representative of the building.
Wall locations
2
PRO1 Tip
NO
NO NO YES

3
Getting to know your thermostat
LCD
1
2
Fan Button
3
System Button
4
5Temperature
Setpoint Buttons
6Menu Button
Displays the user
selectable setpoint
temperature.
HOLD is displayed when
thermostat program is
permanently overridden.
System operation
indicators: The COOL,
HEAT or FAN icon will
display when the COOL,
HEAT or FAN is on.
NOTE: The compressor
delay feature is active if
these icons are flashing.
The compressor will not
turn on until the 5
minute delay has
elapsed.
Days of the
week and time
Glow in the Dark
Light Button
6
1
2
3
4
5
Low Battery Indicator:
Replace batteries when
this indicator is shown.
Program Menu Options:
Shows different options
during programming.
Indicates the current
room temperature.
Programmable Time
Period Icons:
This thermostat has
4 programmable
time periods per day.
Important:
The low battery indicator is displayed
when the AA battery power is low. If the
user fails to replace the battery within
21 days, the thermostat display will only
show the low battery indicator as a final
warning before the thermostat
becomes inoperable. The batteries are
located on the back of the thermostat.
Clean Display:
Pressing CLEAN DISPLAY
will allow 30 seconds to
clean the display. The keys
will be inoperable during
this time. CLEAN will
appear if your contractor
has programmed a filter
change reminder. Press
CLEAN when filter has
been replaced to reset the
filter change reminder timer.

UP
C
O
B
W
SUBBASE INSTALLATION
4
Caution:
Electrical Hazard
Failure to disconnect the
power before beginning to
install this product can cause
electrical shock or equipment
damage.
Mercury Notice:
All of Pro1’s products are
mercury free. However, if the
product you are replacing
contains mercury, dispose of it
properly. Your local waste
management authority can give
you instructions on recycling
and proper disposal.
Horizontal mount
Horizontal mount
Vertical mount
Vertical mount
For vertical mount put
one screw top and one
screw bottom.
For horizontal mount put
one screw left and one
screw right.
RH
RC
G
Y

WIRING
5
Caution: Electrical Hazard
Failure to disconnect the power
before beginning to install this
product can cause electrical
shock or equipment damage.
Warning:
All components of the control
system and the thermostat
installation must conform to
Class II circuits per the NEC Code.
RH & RC terminals
For single transformer systems, leave the jumper
wire in place between RH and RC. Remove jumper
wire for two transformer systems.
Heat pump systems
If wiring to a heat pump, use a small piece of wire
(not supplied) to connect terminals W and Y.
C terminal
The C (common wire) terminal does not
have to be connected when the
thermostat is powered by batteries.
Wire specifications
Use shielded or non-shielded
18 - 22 gauge thermostat wire.
PRO1 Tips:
Wiring
Terminal Designations
If you are replacing a thermostat, make
note of the terminal connections on the
thermostat that is being replaced. In some
cases the wiring connections will not be
color coded. For example, the green wire
may not be connected to the Gterminal.
Loosen the terminal block screws. Insert
wires then retighten terminal block screws.
Place nonflammable insulation into wall
opening to prevent drafts.
1.
2.
3.
Heat relay
Compressor relay
Fan relay
Heat pump changeover valve
energized in cooling
Transformer power for cooling
Transformer power for heating
Heat pump changeover valve energized
in heating
Common wire from secondary side
of cooling system transformer or for
heat only system transformer
W
Y
G
O
RC
RH
B
C

6
WIRING DIAGRAMS
O
B
Typical 1H/1C system: 1 transformer
Power supply
Factory-installed jumper. Remove only when installing on 2-transformer systems.
Use either O or B terminals for changeover valve.
Use a small piece of wire (not supplied) to connect W and Y terminals.
Set fan operation switch to electric
Optional 24 VAC common connection when thermostat is used in battery power mode.
RC
RH
Y
C
W
G
C
L2
L1 (HOT)
R
HEAT RELAY
FAN RELAY
COMPRESSOR
RELAY
6
2
1
FAN RELAY
COMPRESSOR
RELAY
6
2
HEAT RELAY
FAN RELAY
6
2
Typical 1H/1C heat pump system
C
L2
L1 (HOT)
R
HEAT CHANGE
OVER VALVE
FAN RELAY
COMPRESSOR
RELAY
6
4
2
5
1
C
L2
L1 (HOT)
R
HEAT RELAY
6
2
1
Typical 1H/1C system: 2 transformer
Typical heat-only system
Typical heat-only system with fan Typical cool-only system
C
L2
L1 (HOT)
R
HEAT RELAY
FAN RELAY
REMOVE JUMPER
COMPRESSOR
RELAY
6
1
C
L2
L1 (HOT)
R1
2
3
COOL CHANGE
OVER VALVE
C
L2
L1 (HOT)
R1
C
L2
L1 (HOT)
R1
RC
RH
Y
C
W
G
RC
RH
Y
C
W
G
RC
RH
Y
C
W
G
RC
RH
Y
C
W
G
RC
RH
Y
C
W
G

7
TECHNICIAN SETUP MENU
Note: To lock the keypad hold down the and keys for 3
seconds. You will see a lock in the display. To unlock the keypad
hold down the and keys for 3 seconds.
Technician Setup Menu
This thermostat has a technician setup menu
for easy installer configuration. To set up the
thermostat for your particular application:
Configure the installer options as
desired using the table below.
Use the or keys to change
settings and the NEXT STEP or
PREVIOUS STEP key to move from
one option to another. Note: Only
press DONE key when you want to
exit the Technician Setup options.
Press MENU button
Press and hold TECHNICIAN SETUP
button for 3 seconds. This 3 second delay
is designed so that homeowners do not
accidentally access the installer settings.
1.
2.
3.
This feature will
flash FILT in the
display after the
elapsed run time
to remind the
user to change the
filter. A setting of
OFF will disable
this feature.
This feature allows
the installer to
change the
calibration of the
room temperature
display. For
example, if the
thermostat reads 70°
and you would like it
to read 72° then
select +2.
The compressor short
cycle delay protects
the compressor from
“short cycling”. This
feature will not allow
the compressor to be
turned on for 5
minutes after it was
last turned off.
The swing setting,
often called “cycle
rate”, “differential”
or “anticipation” is
adjustable. A smaller
swing setting will
cause more frequent
cycles and a larger
swing setting will
cause fewer cycles.
The swing setting,
often called “cycle
rate”, “differential”
or “anticipation” is
adjustable. A
smaller swing setting
will cause more
frequent cycles and a
larger swing setting
will cause fewer
cycles.
Keypad lockout
allows you to
configure the
thermostat so that
none or some of
the keys do not
function.
The heating swing
setting is adjustable
from ±0.4°F to
±2°F. For example:
A swing setting of
0.5°F will turn the
heating on at
approximately 0.5°F
below the setpoint
and turn the heating
off at approximately
0.5°F above the
setpoint.
Pick PA or FU
PA = partial keypad
lockout, which locks
all the keys except the
or keys.
FU = Full keypad
lockout, which locks
out all the keys.
Note: Keypad lockout
instructions are below.
The cooling swing
setting is adjustable
from ±0.4°F to
±2°F. For example:
A swing setting of
0.5°F will turn the
cooling on at
approximately 0.5°F
above the setpoint
and turn the cooling
off at approximately
0.5°F below the
setpoint.
Selecting ON will not
allow the compressor
to be turned on for 5
minutes after the last
time the compressor
was on. Select OFF
to remove this delay.
You can select the
minimum compressor
run time from “off”,
“3”, “4”, or “5”
minutes. If 3, 4, or 5
is selected, the
compressor will run
for at least the
selected time before
turning off.
You can adjust the
room temperature
display to ready -4°F
to +4°F above or
below the factory
calibrated reading.
You can adjust
the filter change
reminder from
OFF to 2000
hours of runtime
in 50 hour
increments.
OFF 0 ºF OFF ON 0.5 ºF 0.4 ºF NA
TECH SETUP
STEPS CONTINUED
ON THE NEXT PAGE
This feature allows the
installer to select the
minimum run time for
the compressor.
For example, a setting
of 4 will force the
compressor to run for
at least 4 minutes
every time the
compressor turns on,
regardless of the room
temperature.
Tech Setup Steps
Minimum
Compressor
On Time
Compressor
Short Cycle
Delay
Cooling
Swing
Heating
Swing
Keypad
Lockout
Room
Temperature
Calibration
Filter
Change
Reminder

8
TECHNICIAN SETUP MENU
Temperature swing, sometimes called differetial or cycle rate, can be customized for this
individual application. For most applications choose a swing setting that is as long as possible
without making the occupants uncomfortable.
PRO1 Tip
TECH SETUP
STEPS CONTINUED
ON THE NEXT PAGE
Use the or
key to select the
maximum heat
setpoint.
90 ºF
Adjustment Options
Factory Default Settings
This feature
allows you to set a
maximum heat
setpoint value.
The setpoint
temperature
cannot be raised
above this value.
Tech Setup Steps (Continued from the previous page)
Heating
Temperature
Setpoint Limit
GAS
or
ELEC
GAS
Select GAS for
systems that
control the fan
during a call for
heat. Select ELEC
to have the
thermostat control
the fan during a
call for heat.
Fan
Operation
LCD Will Show
Use the or
key to select the
minmum cool
setpoint.
44 ºF
This feature
allows you to set a
minimum cool
setpoint value.
The setpoint
temperature
cannot be lowered
below this value.
Cooling
Temperature
Setpoint Limit
Use the or
key to select 12 or 24
hour clock.
12 Hour Clock
You can select
either a 12 or 24
hour clock setting.
12 or 24
Hour Clock
Use the or
key to turn on or off.
ON
This feature turns your
system on before the
WAKE programming
time to ensure the
enviroment is at the
WAKE setpoint when
the WAKE time period
begins. This recovery
changes over time
based on the previous
day’s experience.
Morning
Recovery
Use the or
key to select 7d for 7
day, 5d for 5+1+1,
or 0d for
nonprogammable.
5d
You can configure this
thermostat to have a
7 day program, a
5+1+1 program or
nonprogrammable.
Program
Options
Select Ffor
Fahrenheit
temperature read
out or select Cfor
Celsius read out
ºF for Fahrenheit
ºC for Celsius
ºF
ºF or ºC

9
TECHNICIAN SETUP MENU
If ON is selected the
beep will sound.
If OFF is selected,
there is no sound.
OFF configures
display light to come
on only with the light
key, which will save
battery power.
ON configures the
display light to come
on when any key is
pressed.
ON ON Heat - Off - Cool
Adjustment Options
Factory Default Settings
The display light can
be configured to
come on when any
key is pressed or
only when the light
key is pressed.
When any key is
pressed an audible
beep will sound.
There is an ON
or an OFF.
You can configure the
system switch for the
particular application:
Heat - Off - Cool,
Heat - Off,
Cool - Off,
Heat - Off - Cool-Auto
Tech Setup Steps (Continued from the previous page)
Beep System
Switch
Display
Light
LCD Will Show
Use the or
key until the desired
application is
flashing.
OFF
Allows you to put your
phone number in the
display.
Select ON to use this
feature then press
NEXT STEP.
Contractor
Call Number
Use the or
key to move from one
character to another.
Use the or
key to change the
flashing character to
your desired number.
Note: If Contractor Call Number is selected ON, your phone number
will show in the display if there has been a continuous call for heating
or cooling for 24 hours or if the light button is held down for 3 seconds.
To remove the phone number from the display, hold the light button
down for 3 seconds.

10
MOUNT THERMOSTAT & BATTERY INSTALLATION
Mount Thermostat
Align the 4 tabs on the subbase with
corresponding slots on the back of the
thermostat, then push gently until the
thermostat snaps in place.
On the back of the thermostat insert
2 AA Alkaline batteries (included).

PROGRAMMING THE THERMOSTAT
Set Time
Programming
11
Weekday Wake 6 a.m. 70° F (21° C) 75° F (24° C)
Leave 8 a.m. 62° F (17° C) 83° F (28° C)
Return 6 p.m. 70° F (21° C) 75° F (24° C)
Sleep 10 p.m. 62° F (17° C) 78° F (26° C)
Factory Default Program
Saturday Wake 8 a.m. 70° F (21° C) 75° F (24° C)
Leave 10 a.m. 62° F (17° C) 83° F (28° C)
Return 6 p.m. 70° F (21° C) 75° F (24° C)
Sleep 11 p.m. 62° F (17° C) 78° F (26° C)
Sunday Wake 8 a.m. 70° F (21° C) 75° F (24° C)
Leave 10 a.m. 62° F (17° C) 83° F (28° C)
Return 6 p.m. 70° F (21° C) 75° F (24° C)
Sleep 11 p.m. 62° F (17° C) 78° F (26° C)
Day of the
Week
Setpoint
Temperature (Cool)
Setpoint
Temperature (Heat)
TimeEvents
Follow the steps below to set the day of the week and current time:
Press MENU
Press SET TIME
Day of the week will be flashing. Use the or key below the time setting to select the current
day of the week.
Press NEXT STEP
The current hour is flashing. Use the or key below the time setting
to select the current hour. When using 12-hour time, make sure the correct a.m. or p.m. choice is selected.
Press NEXT STEP
Minutes are now flashing. Use the or key below the time setting to select current minutes.
Press DONE when completed
1.
2.
3.
4.
5.
6.
7.
8.
All programmable Pro1 thermostats are shipped with an energy saving pre-program. You can customize
this default program by following the Set Program Schedule.
Your thermostat can be programmed to have each day of the week programmed uniquely (7 days), all
the weekdays the same, a separate program for Saturday, and a separate program for Sunday (5+1+1),
or nonprogrammable. There are four time periods for each program (WAKE, LEAVE, RETURN, SLEEP).
This thermostat has a programmable fan feature, which allows you to run the fan continuously during
any time period.

PROGRAMMING THE THERMOSTAT
12
Weekday Wake
Leave
Return
Sleep
Programming Table
Saturday
Sunday
You can use the table below to plan your customized program schedule if using 5+1+1.
Set Program Schedule
To customize your 5+1+1 program schedule, follow these steps:
Weekday: Saturday:
Sunday:
Select HEAT or COOL using the SYSTEM key.
Note: You have to program heat and cool each separately.
Press MENU
Press SET SCHEDULE Note: Monday-Friday is displayed and
the WAKE icon is shown. You are now programming the WAKE
time period for the weekday setting.
Use the or key below the time setting to make your
time selection for the weekday WAKE time period. Note: If you
want the fan to run continuously during this time period, select
ON with the FAN key.
Use the or temperature setpoint keys on the right side
of your screen to make your temperature selection for the
weekday WAKE period.
Press NEXT STEP
Repeat steps 4 through 6 for
Saturday WAKE time period,
for Saturday LEAVE time
period, for Saturday RETURN
time period, and for Saturday
SLEEP time period.
Repeat steps 4 through 6 for
Sunday WAKE time period,
for Sunday LEAVE time
period, for Sunday RETURN
time period, and for Sunday
SLEEP time period.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Wake
Leave
Return
Sleep
Wake
Leave
Return
Sleep
Day of the
Week
Setpoint
Temperature (Cool)
Setpoint
Temperature (Heat)
TimeEvents
Repeat steps 4 through 6 for weekday LEAVE time period, for
weekday RETURN time period, and for weekday SLEEP time period.

To customize your 7 day program schedule, follow these steps:
Select HEAT or COOL using the SYSTEM key. You have to program heat and cool each separately.
Press MENU
Press SET SCHEDULE
Note: Monday is displayed and the WAKE icon is shown. You are now programming the WAKE
time period for the Monday setting.
Use the or key below the time setting to make your time selection for the weekday
WAKE time period. Note: If you want the fan to run continuously during this time period, select ON
with the FAN key.
Use the or temperature setpoint keys on the right side of your screen to make your tem-
perature selection for the weekday WAKE period.
Press NEXT STEP
Repeat steps 4 thru 6 for Monday LEAVE time period, for Monday RETURN time period, and for
Monday SLEEP time period.
Repeat steps 4 thru 7 for each of the remaining days in the week.
PROGRAMMING THE THERMOSTAT
13
1.
2.
3.
4.
5.
6.
7.
1.
2.
3.
4.
5.
6.
7.
8.
A Note About Auto Changeover:
Auto changeover will switch between heating
and cooling as needed. It is very important to
make sure the cooling setpoint temperature is at
least 3º above the heating setpoint temperature
and that the heating setpoint temperature is at
least 3º below the cooling setpoint temperature.
A Note About Programmable Fan:
The programmable fan feature will
run the fan continuously during any
time period it is programmed to be
on. This is the best way to keep the
air circulated and to eliminate hot &
cold spots in your building.

The display range of temperature
The control range of temperature
Load rating
Display accuracy
Swing (cycle rate or differential)
Power source
Operating ambient
Operating humidity
Dimensions of thermostat
41ºF to 95ºF (5ºC to 35ºC)
44ºF to 90ºF (7ºC to 32ºC)
1 amp per terminal, 1.5 amp maximum all terminals combined
± 1ºF
Heating is adjustable from 0.4ºF to 2.0ºF
Cooling is adjustable from 0.4ºF to 2.0ºF
18 to 30 VAC, NEC Class II, 50/60 Hz for hardwire (common wire)
Battery power from 2 AA Alkaline Energizer batteries
32º to +105º (0º to +41ºC)
90% non-condensing maximum
4.7”W x 4.4”H x 1.1”D
14
SPECIFICATIONS & CONTACT INFORMATION
Specifications
Pro1 IAQ Inc.
1111 S. Glenstone
Suite 2-100
Springeld, MO 65804
Toll-free: 1-888-Pro1iaq (776-1427)
Toll Number (Outside the USA): 330-821-3600
Web: http://www.pro1iaq.com
Hours of Operation: Monday - Friday 9 AM - 6 PM Eastern