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Installation Manual
Pro1 Technologies
Toll Free: 888-776-1427
Web: www.pro1iaq.com
Hours of Operation: M-F 9AM - 6PM Eastern
Thermostat Application Guide
Description
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
Yes
Yes
Yes
Power Type
Battery Power
Hardwire (Common Wire)
Hardwire (Common Wire) with
Battery Backup
Table of Contents
Installation Tips
Thermostat Quick Reference
Wiring
Wiring Diagrams
Technician Setup Menu
Programming
Features
Specications
Page
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.
Una version en espanol de este
manual se puede descargar en
la pagina web de la compania.
U.S. Registered Trademark. Patents pending
Copyright 2022 All Rights Reserved.
5-8
13-21
1
1
1
1
2-4
Yes
Yes
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.
Installation Tips
2
2
2
2
Note: To ensure a solid t between the
thermostat and the subbase:
1. Mount subbase to a at wall
2. Use screws provided
3. Drywall anchors should be ush with the wall
4. Wires should be pushed into the wall
Installation Tips
The thermostat should be installed approximately 4 to 5 feet above the
oor. Select an area with average temperature and good air circulation.
• 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
Wall Locations
Pick an installation location that is easy for the user to access. The temperature
of the location should be representative of the building.
Installation Tip
Do not install thermostat in these locations:
3
3
3
3
4
4
4
4
Installation Tips
22-29
30
Vertical Mount
Horizontal Mount
For horizontal mount put one screw on
the left and one screw on the right.
All of our 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.
Mercury Notice
Failure to disconnect the power before beginning to install this product
can cause electrical shock or equipment damage.
Installation Tip: Electrical Hazard
For vertical mount put one screw on
the top and one screw on the bottom.
Subbase Installation
11-12
9-10
P.O. Box 3377
Springeld, MO 65808-3377
31
Rev. 2214
T855
Terminal Designations
This thermostat is shipped from the factory to operate a conventional heating
and cooling system. This thermostat may also be congured for a heat pump
system. See the “heat pump” conguration step on page 14 of this manual to
congure the thermostat for heat pump applications.
Wiring
Terminal
2 Heat 2 Cool
Conventional
System
2 Heat 1 Cool
Heat Pump
System
3 Heat 2 Cool
Heat Pump
System
RC
RH
C
B
O
G
W/E
Y
Y2
W2
Transformer power
(cooling)
Transformer power
(heating)
Transformer
common
Fan relay
First stage
of heat
First stage
of cool
Second stage
of cool
Second stage
of heat
Transformer power
(cooling)
Transformer power
(heating)
Transformer
common
Fan relay
Emergency Heat
First stage of
heat & cool
N/A
Auxiliary heat
Transformer power
(cooling)
Transformer power
(heating)
Transformer
common
Wiring
Caution:
Electrical Hazard
All components of the control
system and the thermostat
installation must conform to
Class II circuits per the NEC Code.
Warning:
Do not overtighten terminal
block screws, as this can
damage the terminal block.
A damaged terminal block
can keep the thermostat
from tting on the subbase
correctly or cause system
operation issues.
Installation Tip
Max Torque = 6in-lbs.
Wiring
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 terminal.G
Loosen the terminal block screws.
Insert wires then retighten the
terminal block screws.
Place nonammable insulation into
the wall opening to prevent drafts.
1.
2.
3.
Wiring Tips
C Terminal
The C (common wire) terminal does
not have to be connected when the
thermostat is powered by batteries.
Wire Specications
Use shielded or non-shielded 18-22
gauge thermostat wire.
Failure to disconnect the power
before beginning to install this
product can cause electrical shock
or equipment damage.
Note:
In many heat pump systems with
no emergency heat relay, a jumper
can be installed between and E
W2 to turn thermostat into a single
stage control for Emergency Heat
Operation.
Thermostat Quick Reference
Displays the current room temperature
Time and day of the week
Staging Indicators: 1 will appear in the display when rst stage of heat or
cool is on. +2 will appear for the second stage of heat. +3 will appear
for the third stage of heat.
Setpoint: Displays the user selectable setpoint temperature.
Hold: is displayed when the thermostat program is permanently overridden.
System Operation Indicators:
If these or the Fan indicator are ashing, it means that the system is in a
delay of some type (compressor delay, cooling fan delay, staging delay).
Low Battery Indicator: Replace batteries when this indicator is shown.
Program Menu Options: Show dierent options during programming.
Program Time Periods - Residential: Uses 4 time periods - WAKE, RETURN,
LEAVE & SLEEP. Commercial: Uses 2 or 4 time periods that appear in the text
eld - Occupied & Unoccupied.
Getting to know your thermostat
Thermostat Quick Reference
5
5
5
5
6
6
6
6
9
9
9
9
10
10
10
10
Battery Installation
Battery installation is recommended even if the thermostat is
hardwired (C terminal connected). When the thermostat is hardwired
and batteries are installed, the thermostat will activate a compressor
delay of 5 minutes when it detects a power outage from the hardwired
power supply.
Important:
High quality alkaline batteries are recommended.
Rechargeable batteries or low quality batteries
do not guarantee a 1-year life span.
Insert 2 AA Alkaline batteries
(included). High quality alkaline
batteries are recommended.
Simple operating instructions
are found on the back of the
battery door.
To release battery cover press nger bevel
on the left side and lift the cover to access
batteries.
Energy Ecient Globe: Indicates ecient setpoint temperature.
Keypad Lockout: Indicates the thermostat is in keypad lockout.
Fan relay
Secodn stage of
auxiliary heat
First stage of
auxiliary heat
First stage of
heat & cool
Second stage
of heat & cool
Reversing valve
/ congurable
terminal
Reversing valve
/ congurable
terminal
Reversing valve
/ congurable
terminal
Reversing valve
/ congurable
terminal
Reversing valve
/ congurable
terminal
Reversing valve
/ congurable
terminal
Getting to know your thermostat
Glow in the dark light button
Setpoint buttons
Program buttons
Menu button
Fan button
LCD Display
System button
Button/battery access door
Battery cover
Gently slide a screwdriver into the bottom edge
of the badge. Gently turn the screwdriver counter
clockwise. The badge is held on by a magnet in the
well of the battery door. The badge should pry o
easily. DO NOT USE FORCE.
About The Badge
All of our thermostats use the same universal magnetic badge. Visit the
company website to learn more about our free private label program.
Thermostat Quick Reference
7
7
7
7
8
8
8
8
11
11
11
11
12
12
12
12
Wiring Diagrams Wiring Diagrams
Typical 2H/2C System: 1 Transformer
Typical 2H/2C System: 2 Transformer
Typical Heat Only System With Fan
Typical Cool-Only System With Fan
FAN RELAY
HEAT RELAY
RC
RH
Y
C
W/E
G
C
R
L2
L1(HOT)
FAN RELAY
COMPRESSOR
RELAY
C
R
L2
L1(HOT)
RC
RH
Y
C
G
Power supply
Factory-installed jumper. Remove only when installing on 2-transformer systems
Use either O or B terminals for changeover valve
Optional 24 VAC common connection when thermostat is used in battery power mode
W/E
REMOVE JUMPER
RC
RH
Y
C
W/E
G
W2
Y2
C
R
L2
L1(HOT)
C
R
L2
L1(HOT)
COMPRESSOR
RELAY
HEAT RELAY
FAN RELAY
Note:
In many systems with no emergency heat relay a jumper can be installed
between E and W2.
Magnet in door
Use the bevel on lower ridge
Thermostat Quick Reference
The low battery icon is displayed when the AA battery power is low. Whenever the
thermostat detects low battery voltage from the AA batteries, the low battery icon will
begin ashing on the screen for 21 days (if the batteries are not changed). If the batteries
are not changed 22 days after the thermostat detects low battery voltage, the thermostat
screen will only show the ashing battery icon until buttons are pressed. If the batteries
are not changed 43 days after the thermostat detects low battery voltage, the thermostat
screen will only show the ashing battery icon until buttons are pressed and the set points
will oset to 85°F/29°C in cooling and 55°F/13°C in heating. At this stage, set point changes
can be made temporarily but, the set points will change back to defaulted values after a
4-hour period. The thermostat will continue to perform this low battery ashing,
temperature oset condition until the internal voltage threshold is reached. When the
thermostat internal voltage threshold is reached, all relays will be opened and the
thermostat will become inoperable until new batteries are installed.
Important
HEAT RELAY 2
COMPRESSOR
RELAY 2
Typical Cool-Only System With Fan
RC
RH
Y
C
W/E
G
W2
Y2
COMPRESSOR
RELAY
FAN RELAY
HEAT RELAY 2
COMPRESSOR
RELAY 2
HEAT RELAY
C
R
L2
L1(HOT)
Typical 3H/2C or 2H/1C Heat Pump System
RC
RH
Y
C
W/E
G
W2
Y2
COMPRESSOR
RELAY
FAN RELAY
AUXILIARY
HEAT RELAY
COMPRESSOR
RELAY 2
EMERGENCY
HEAT RELAY
COOL CHANGE
OVER VALVE
HEAT CHANGE
OVER VALVE
C
R
L2
L1(HOT)
O
B
Produktspecifikationer
| Varumärke: | Pro1 |
| Kategori: | Termostat |
| Modell: | T855 |
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