Observer TSTAT0101SC User manual

616 01 1017 02 08/07/12
Communicating Wall Control
Installation Manual
TSTAT0101SC
U.S. Patent No. 7,243,004
U.S. Patent No. 7,775,452

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Safety Considerations 7...............................
Introduction 8.........................................
Quick Start 9.........................................
Set Day and Time 9.................................
Set Schedule for All Days 11.........................
Installation 14........................................
Overview 14.......................................
Check Equipment 15................................
Location 15........................................
Wall Control 15..................................
Remote Room Sensors 16........................
Wiring Considerations 17............................
Shielded Wire 20.................................
Noncommunicating equipment 20.................
Mounting 21.......................................
Humidifier Connection 22............................
Bypass Humidifiers 23............................
Fan Powered Humidifiers 23.......................
Commissioning 23....................................
Communicating System Overview 23..................

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Selecting Humidifier 26..............................
Selecting Indoor Unit 26.............................
Selecting Outdoor Unit 28...........................
Equipment Configuration 29..........................
Brand Selection 30.................................
Install/Service Menus – NonCommunicating Mode 30.....
Equipment Menu 32................................
Filter Reminder 33..................................
Auto Mode Enable 34...............................
Room Temperature Sensing 35......................
Reversing Valve 36.................................
English/Metric Display 37............................
Fan on with W 38...................................
Cooling Lockout 39.................................
Auxiliary Heat Lockout 40............................
Heat Pump Lockout 41..............................
Minimum Cooling Setpoint 42........................
Maximum Heating Setpoint 43........................
Outdoor Air Temperature Offset 44...................
Room Air Temperature Offset 45.....................

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Smart Recovery 46.................................
Setpoint Deadband 47..............................
Cycles Per Hour 48.................................
Auto Changeover Timer 49..........................
Time Between Fuel Types 50........................
Humidity Offset 51..................................
Programming On/Off 52.............................
Reset to Factory Defaults 53.........................
Dealer Info 54......................................
Service Reminder 55................................
Install/Service Menus – Communicating Mode 55.........
Setup Menu 55.....................................
Main Setup Menu 56.............................
Auto Mode 56.................................
Setpoint Deadband 57..........................
Offsets 57....................................
Cycles Per Hour 57............................
Programming 58...............................
Smart Recovery 58............................
English/Metric Display 58.......................

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Airflow 58.......................................
Heating Airflow 59.............................
Furnace / Fancoil Heating Airflow 59.............
Heat Pump Heating Airflow 60...................
Cooling Airflow 60.............................
Dehum Airflow 61..............................
Low Heat Rise 61..............................
Furnace Airflow (Capacity) Limiting 62............
Dehum Drain 63...............................
Off Delay 63..................................
Heat Pump/AC 64................................
Cooling Lockout 64............................
Defrost Interval 65.............................
Quiet Shift 66.................................
Defrost With Furnace 67........................
Filter Reminder 68.............................
HRV (Heat Recovery Ventilation) 69..............
System Maintenance 70..........................
Remind Owner of Routine Maintenance 70........
Service Menus 71..................................

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Status 71........................................
Heat Stage (Furnace) 71........................
Electric Heat (Fan Coil) 71......................
Airflow CFM 72................................
Inducer RPM (90% furnaces only) 72.............
Blower RPM 72................................
Lockout Timer 72..............................
Heat Pump/AC Status 72.......................
Stage: (Heat/Cool) 72..........................
Defrost 72....................................
Outdoor Coil Temp 73..........................
Last 10 System Events 73.........................
Run/Fault History 75..............................
Cycle Counters 75.............................
Run Timers 75................................
Appendix – Wiring Diagrams 75.........................

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Safety Considerations
Improper installation, adjustment, alteration, service, main
tenance, or use can cause explosion, fire, electrical shock, or
other conditions which may cause death, personal injury or
property damage. Consult a qualified installer, service
agency or your distributor or branch for information or assist
ance. The qualified installer or agency must use factoryau
thorized kits or accessories when modifying this product.
Refer to the individual instructions packaged with the kits or
accessories when installing.
Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Have a fire extinguisher available.
Read these instructions thoroughly and follow all warnings
and cautions included in literature and attached to the unit.
Consult local building codes and the current edition of the
National Electrical Code (NEC) NFPA 70.
In Canada, refer to the current editions of the Canadian Elec
trical Code CSA C22.1.
Recognize safety information. When you see this symbol
on the unit and in instructions or manuals, be alert to the
potential for personal injury. Understand these signal words:
DANGER, WARNING, and CAUTION. These words are
used with the safety-alert symbol. DANGER identifies the

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most serious hazards which will result in severe personal
injury or death. WARNING signifies hazards which could
result in personal injury or death. CAUTION is used to
identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.
Introduction
The communicating system consists of several intelligent
communicating components which includes the Observer
Control, variable speed furnace or fan coil, 2stage AC or
HP, which continually communicate with each other via a
fourwire communication bus. Commands, operating condi
tions, and other data are passed continually between com
ponents over the communication bus. The result is an en
hanced level of comfort, versatility, and simplicity. All
communicating furnaces or fan coils are variablespeed and
multistage for maximum flexibility, efficiency, and comfort.
They support controlled humidification, dehumidification, and
air quality control. Either a communicating, or a standard
24VAC controlled outdoor unit may be used. When using
conventional outdoor units, the communicating furnace or
fan coil provides the 24 volt signals needed to control them.
All system components are controlled through the wall

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mounted Observer Control, which replaces the conventional
thermostat and provides the homeowner with a single wall
control for all features of the system.
Quick Start
For first time installers, Quick Start will allow a quick start up
of the Observer Control before learning all the details of sys
tem operation. However, for the best possible comfort and
operation refer to the Owner’s Manual.
Set Day and Time
To set the current time and date, press SETUP; then press
TIME/DATE.

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Under date, you can select the month, day, or year buttons;
then use the ▲ and ▼ to select the appropriate date. . Un
der time, you can select the hour, minute, and am/pm; then
use the ▲ and ▼ to select the appropriate time. You also
have the option of selecting between a 12 HR or 24 HR clock
format. Finally, you can choose whether you observe day
light savings time by pressing the ON or OFF button. Press
DONE to save and exit the information that you have
entered.

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Set Schedule for All Days
The Observer Control gives you flexibility in how to create a
comfort schedule. You can choose one schedule for all days;
create a schedule for your work week and the weekend; or
you can make every day different.
You can create on schedule for all seven days in the week.
1. Press SETUP, then SCHEDULE

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2. Press ▲ under “All Days”, then press EDIT.

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3. Press PERIOD; then use the ▲ or ▼ to select the period to
change.

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4. Press START;then use the ▲ or ▼ to change the time the
corresponding period starts.
5. Press HEAT TO; then use the ▲ or ▼ to change the desired
heating temperature for that period.
6. Press COOL TO; then use the ▲ or ▼ to change the desired
heating temperature for that period.
7. Press DONE after you have completed your edits.
8. Press SAVE to save your new schedule and exit (or press
CANCEL to exit without saving.)
Installation
Overview
This instruction covers installation of the Observer Control
only. Physical installation instructions for the indoor and out
door equipment and accessories are provided with each unit.
Setup, commissioning, operation, and troubleshooting of the
communicating system are covered only in this installation
instruction. It is the guide to connecting the system compon
ents and commissioning the system once all physical com
ponents are installed. Special screen prompts and startup
capabilities are provided in the communicating system to

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simplify and automate the initial commissioning of the sys
tem.
Install Observer Control according to this instruction.
Install indoor unit, outdoor unit, and accessories according
to their instructions.
Wire complete system according to this instruction.
Setup, commission, and operate system according to this
instruction to assure a smooth and trouble free startup.
Check Equipment
Inspect equipment. File claim with shipping company prior to
installation if shipment is damaged or incomplete.
Location
All wiring must comply with national, local, and state codes.
Wall Control
The Observer Control is the command center for the commu
nicating system. It should be located where it is easily ac
cessible and visible to the adult homeowner or end user. For
accurate temperature measurement, the following guidelines
should be followed:
The Observer Control and Room Sensors SHOULD be
mounted:
Approximately 5ft (1.5 m) from the floor.

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Close to or in a frequently used room, preferably on an inside
partitioning wall.
On a section of wall without pipes or ductwork.
The Observer Control and Room Sensors SHOULD NOT be
mounted:
Close to a window, on an outside wall, or next to a door lead
ing to the outside.
Exposed to direct light or heat from a lamp, sun, fireplace, or
other temperatureradiating objects which could cause a false
reading.
Close to or in direct airflow from supply registers.
In areas with poor air circulation, such as behind a door or in
an alcove.
Remote Room Sensors
A Remote Room Sensor can be used with the Observer
Control to take the place of the control’s internal temperature
sensor. This allows the Observer Control to be mounted in
areas with less than optimal airflow (such as near an exterior
door, window or in a closet). The remote sensor can be
wired to the terminal block connectors labeled S1 and S2 at
the control’s backplate. The Observer Control will automat
ically detect the Remote Room Sensor and ignore its internal
temperature sensor. Typically, one remote sensor is used

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but, multiple sensors may be used and averaged in some
applications. Averaging requires a special seriesparallel wir
ing method with a specific number of sensors. See Fig. 1. It
is also important to note the humidity sensor cannot be re
motely located, so do not locate the Observer Control in an
area where humidity sensing may not be accurate.
Fig. 1 – Remote Room Sensor – Parallel Wiring
Wiring Considerations
Ordinary thermostat wire is recommended. Use 22 AWG or
larger for normal wiring applications. Continuous wire lengths
over 100 ft. should use 20 AWG or larger.
NOTE: The communicating bus wiring only requires a
fourwire connection; however, it is good practice to run ther

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mostat cable having more than four wires in the event of a
damaged or broken wire during installation.
Each communicating device in the system has a fourpin
connector. It is recommended that the following color code
be used when wiring each device:
DX+ — Green = Data A
DX- — Yellow = Data B
C — White = 24VAC (Com)
R — Red = 24VAC (Hot)
NOTE: TERMINAL MARKINGS FOR EACH COMMUNICAT
ING SYSTEM COMPONENT MAY NOT BE IN THE SAME
ORDER. IT IS NOT MANDATORY THAT THE ABOVE COL
OR CODE BE USED, BUT EACH CONNECTOR IN THE
SYSTEM MUST BE WIRED CONSISTENTLY.
A separate fourpin connector comes inside packaging and
should be used when connecting to furnace (or fan coil). En
sure connector is inserted properly into circuit board.
1. Turn off all power to equipment.
2. If an existing thermostat or control is being replaced:
a. Remove existing thermostat from wall.
b. Disconnect wires from existing thermostat.
c. Discard or recycle old thermostat.

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NOTE: Mercury is a hazardous waste, if existing control con
tains any mercury, it MUST be disposed of properly. The Ob
server Control does not contain mercury.
3. Select Observer Control mounting plastic
4. Route wires through hole in mounting plastic. Level rear
plastic against wall (for aesthetic value only  Observer Con
trol need not be level to operate properly) and mark wall
through two mounting holes.
5. Drill two 3/16in (4.8 mm) mounting holes in wall where
marked.
6. Secure mounting plastic to wall using two screws and an
chors provided.
7. Adjust length and routing of each wire to reach each wire
entry on the connector backplate. Strip 1/4in (6.4 mm) of
insulation from each wire.
8. Match and connect thermostat wires to proper terminals
on wall control backplate. See wiring diagram XX in Ap
pendix A.
9. Push any excess wire into the wall. Seal hole in wall to
prevent any air leaks. Leaks can affect operation.
10. Attach Observer Control to the mounting plastic by lining
up the plastic guides on the back of the control with the
opening on the mounting plastic and push on.

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11. Perform installation of all other system equipment (i.e.
humidifier, UV lights, etc.).
12. Turn on power to equipment.
NOTE: In a dual fuel installation with a noncommunicating
heat pump, an OAT sensor must be installed, or the heat
pump will not run.
Shielded Wire
If the thermostat wiring will be located near or in parallel with
high voltage wiring, cable TV or Ethernet wiring, then shiel
ded thermostat wire can be used to reduce or eliminate po
tential interference. The shield wire should be connected to
the C terminal, or ground, at the indoor unit. The shield wire
should NOT be connected to any terminal at the wall control.
Connecting the shield to ground at both ends can cause cur
rent loops in the shield, reducing shield effectiveness.
Noncommunicating equipment
The Observer Control, when paired with the NAXA00101DB
daughter board, will operate noncommunicating equipment.
When the system utilizes the NAXA00101DB daughter
board, the Observer Control operates as a standard univer
sal thermostat. See Appendix Wiring Diagrams