Tekmar tekmarNet 552 User manual

tekmarNet®Thermostat 552
Installation & Operation Manual
552_D
09/14
Zoning Replaces: 08/11
© 2014 552_D - 09/14
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A Watts Water Technologies Company
The tekmarNet®Thermostat 552
provides operation for:
One Stage Heat•
Introduction Features
Touchscreen
Bright Backlight
tekmarNet® Communication
Outdoor Temperature Display
Floor Temperature Display
7-Day, 4 Event Programmable
Schedule
Optimum Start
Scenes
Away Key
Air Group Member
Freeze Protection
Exercise Pump or Valves
Zone Synchronization
Two Auxiliary Sensor Inputs
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Benefits
Simple to Use
Increased Comfort Through
Precise Temperature Control
Conserves Energy
Convenience Through Internet
Connectivity
Warm Radiant Floors
Protects Radiant Floors From
Over Heating
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A Watts Water Technologies Company
Table of Contents
Getting Started...................................................................................................4
Installation ..............................................................................................................4
Preparation.........................................................................................................4
Removing The Thermostat Base .......................................................................5
Mounting The Thermostat Base.........................................................................5
Thermostat Wiring..............................................................................................6
Compatible Sensors........................................................................................... 7
Testing the Thermostat Wiring ...........................................................................8
Mounting the Thermostat ................................................................................. 10
Cleaning the Thermostat.................................................................................. 10
Switch Settings......................................................................................................11
User Interface....................................................................................................... 12
Home Screen ................................................................................................... 12
Symbols Description ........................................................................................ 12
Programmable Settings........................................................................................ 13
Programming Menus........................................................................................ 13
Set Temp Menu................................................................................................ 14
Time Menu ....................................................................................................... 17
Schedule Menu................................................................................................ 19
Display Menu ...................................................................................................20
Scenes Menu................................................................................................... 21
Monitor Menu ...................................................................................................22
Toolbox Menu................................................................................................... 24
Setup Menu...................................................................................................... 27
Sequence of Operation.........................................................................................29
Heating Operation............................................................................................29
Air Group Operation......................................................................................... 31
Time Clock....................................................................................................... 31
Temperature Adjustment..................................................................................32
Programmable Schedules................................................................................33
Scenes (System Override)............................................................................... 34
Secondary Temperature Display............................................................................... 35
Access Levels ..................................................................................................36
tekmarNet®Address.........................................................................................36
Screen Clean Menu ......................................................................................... 36
Troubleshooting .................................................................................................... 33
Error Messages................................................................................................ 37
Frequently Asked Questions ............................................................................ 42
Technical Data ................................................................................................. 43
Limited Warranty and Product Return Procedure ............................................44

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A Watts Water Technologies Company
It is your responsibility to ensure that this thermostat is safely installed according
to all applicable codes and standards. tekmar is not responsible for damages
resulting from improper installation and/or maintenance.
Important Safety Information
This is a safety-alert symbol. The safety alert symbol is shown alone
or used with a signal word (DANGER, WARNING, or CAUTION),
a pictorial and/or a safety message to identify hazards.
When you see this symbol alone or with a signal word on your
equipment or in this Manual, be alert to the potential for death or
serious personal injury.
This pictorial alerts you to electricity, electrocution, and shock
hazards.
This symbol identifies hazards which, if not avoided, could result
in death or serious injury.
This symbol identifies hazards which, if not avoided, could result
in minor or moderate injury.
This symbol identifies practices, actions, or failure to act which
could result in property damage or damage to the equipment.
Read Manual and all product labels BEFORE using the
equipment. Do not use unless you know the safe and
proper operation of this equipment. Keep this Manual
available for easy access by all users. Replacement
Manuals are available at tekmarControls.com
It is the installers responsibility to ensure that this thermostat is safely installed
according to all applicable codes and standards.
Improper installation and operation of this thermostat could result in damage to the
equipment and possibly even personal injury or death.
This thermostat is not intended for use as a primary limit control. Other controls that
are intended and certified as safety limits must be placed into the control circuit.
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Do not attempt to service the thermostat. There are no user serviceable parts inside
the thermostat. Attempting to do so voids warranty.

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A Watts Water Technologies Company
Congratulations on the purchase of your new tekmar thermostat.
This manual will step through the complete installation, programming and sequence
of operation for this control. At the back, there are tips for control and system
troubleshooting.
Getting Started
Preparation
tekmar or jeweller screwdriver
Phillips head screwdriver
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Wire Stripper•
Tools Required
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Materials Required
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18 AWG LVT Solid Wire
(Low Voltage Connections)
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Installation
Choose the placement of the thermostats early in the construction process to
enable proper wiring during rough-in.
Installation Location
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Consider the following:
Interior Wall.
Keep dry. Avoid potential leakage onto the control.
Relative Humidity less than 90%. Non-condensing environment.
No exposure to extreme temperatures beyond 32-122°F (0-50°C).
No draft, direct sun, or other cause for inaccurate temperature readings.
Away from equipment, appliances, or other sources of electrical
interference.
Easy access for wiring, viewing, and adjusting the display screen.
Approximately 5 feet (1.5 m) off the finished floor.
The maximum length of wire is 500 feet (150 m).
Strip wire to 3/8" (10 mm) for all terminal connections.
Use standard 8 conductor, 18 AWG wire.
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To prevent the risk of personal injury and/or death, make sure power
is not applied to the thermostat until it is fully installed and ready for
final testing. All work must be done with power turned off to the circuit
being worked on.
Please be aware local codes may require this thermostat to be installed
or connected by an electrician.

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A Watts Water Technologies Company
Removing The Thermostat Base
To remove the thermostat base:
Locate the tab on the bottom of the
thermostat.
Push the tab with either your thumb or
with a screwdriver.
Lift the thermostat front away from the
thermostat’s base.
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Mounting The Thermostat Base
3 1/4”
(83 mm)
Thermostat
Front
Thermostat
Base
Stud
Gang
Box
If a single gang box is used:
Feed the wiring through the large
hole of the thermostat base.
Fasten the base of the thermostat
to the gang box.
Terminate wiring to the wiring
strip.
Push the thermostat front onto
the thermostat base.
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Wall
Stud
Thermostat
Front
Thermostat
Base
If a gang box is not used:
Feed the wiring through the large
hole in the thermostat base.
Mount the thermostat base
directly to the wall.
Use screws in the screw holes
to fasten the thermostat to the
wall. At least one of the screws
should enter a wall stud or
similar rigid material.
Terminate wiring to the wiring
strip.
Push the thermostat front onto
the thermostat base.
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A Watts Water Technologies Company
Thermostat Wiring
The thermostat operates a single heating system zone and can be wired in four
different ways.
tekmarNet®2- Allows the thermostat to be wired point-to-point using 2 wires to a
tekmarNet®2 Wiring Center, House Control, or Zone Manager. This allows easy
wiring for retrofit applications.
tekmarNet®4- Allows the thermostat to be wired using 4 wires to a tekmarNet Wiring
Center or Zone Manager point-to-point. Alternatively, the thermostat can operate
heating equipment locally and the tN4 communication bus can be daisy-chained
from one thermostat to another.
Stand Alone - Simple 3 wire connection to a 24 V (ac) transformer and zone valve.
Stand Alone - Simple 3 wire connection to a switching relay or zone valve control.
Wiring - tekmarNet®2
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Wiring - tekmarNet®4
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tN2 tN2
C
tN2
tN4
tN2
R
Rh W1
No Power
S1 S2
Com
tN2 Wiring Center
tN2 House Control
tN2 Zone Manager
Optional Sensor 1
Optional Sensor 2
C
tN2
tN4
tN2
R
Rh W1
No Power
S1 S2
Com
tN4 C W
R
Optional Sensor 1
Optional Sensor 2
Install field jumper
wire R to Rh
tN4 Wiring Center
tN4 Zone Manager

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A Watts Water Technologies Company
Wiring - Stand Alone to Transformer and Zone Valve
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C
tN2
tN4
tN2
R
Rh W1
No Power
S1 S2
Com
RC
LN
Optional Sensor 1
Optional Sensor 2
Install field jumper
wire R to Rh
Zone Valve
24 V (ac)
transformer
Wiring - Stand Alone to Switching Relay or Zone Valve Control
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W(T)(T) R
24 V
W(T)(T) R
HNXX HNHN NL
Com Switching Relay
Zone 1 Zone 2 Zone 3
W(T)(T) R
C
tN2
tN4
tN2
R
Rh W1
No Power
S1 S2
Com
Optional Sensor 1
Optional Sensor 2
Zone Pump N
L
Compatible Sensors
The thermostat is compatible with Indoor Sensor type 076, 077, 084, Floor Sensor type
072, 073, 079, and Outdoor Sensor type 070.

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A Watts Water Technologies Company
Testing the Power
If the thermostat display turns on, this indicates that the thermostat is operating
correctly and there are no electrical issues. In the event that the display is off, or the
display is cycling on and off:
1. Remove the thermostat front.
2. Use an electrical meter to measure DC voltage between the tN2 terminals.
If the DC voltage is 0 V (dc) for at least 20 seconds, then there is an open or short
circuit in the tN2 wires.
If the DC voltage is 0 V (dc) for 10 seconds and then is 23 to 24 V (dc) for 5 seconds,
this indicates the wiring is correct.
3. Connect the thermostat to the tN2 wires connected to a zone on a House Control,
Wiring Center, or Zone Manager.
4. If the thermostat display is off, or is cycling on and off, move the thermostat to the
next available zone on the House Control, Wiring Center, or Zone Manager.
If the thermostat display remains permanently on, there may be a fault with the
previously tried zone on the House Control, Wiring Center, or Zone Manager.
If the thermostat display continues to be off, or is cycling on and off, there may be
a fault on the thermostat.
If a fault is suspected, contact your tekmar sales representative for assistance.
Testing the Heat Zone Output Wiring
1. Touch the button and set the heating temperature above the current room
temperature. Make sure the display does not show “WWSD” or “Floor Max”.
2. When the “Heat On” symbol appears on the display, use an electrical meter to
check for voltage on the House Control, Wiring Center, or Zone Manager relay.
The voltage is 24 V (ac) for zone valves, and 120 V (ac) for zone pumps when
operating correctly.
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Testing the Thermostat Wiring
Testing tekmarNet®2 Wiring
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Only qualified personnel should perform testing procedures. A licensed electrician
is recommended.

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A Watts Water Technologies Company
Testing the Power
1. Remove the front cover from the thermostat.
2. Use an electrical test meter to measure (ac) voltage between the R and C terminals.
The reading should be 24 V (ac) +/– 10%.
3. Install the front cover.
Testing the Heat Relay
1. Remove the front cover from the thermostat.
2. Touch the button and set the heating temperature below the current room
temperature. There should be no “Heat On” symbol on the display.
3. Set the electrical test meter to continuity.
4. Place electrical meter probes between R and W. There should be no continuity. If
there is continuity then there may be a wiring fault or the relay may be faulty.
5. Touch the button and set the heating temperature above the current room
temperature. Make sure the display does not show “WWSD”. The “Heat On” symbol
should appear on the display.
6. There should now be continuity between the R and W terminals.
Testing the tekmarNet®4 Bus Wiring
The symbol is shown on the display when communication is present. If the
thermostat is connected in a network and the communication is missing, there may
be an open or short circuit on the tN4 and C bus wires.
1. Remove the front cover from the thermostat.
2. To test for short circuits:
Disconnect the tN4 bus wires on one end.
Install wire nuts on each wire to ensure the wire ends are not touching.
Disconnect the tN4 bus wires on the other end.
Measure for continuity using an electrical meter.
If continuity is present, there is a short circuit fault along the wires. It is recommended
to replace the tN4 bus wires.
3. To test for open circuits:
Disconnect the tN4 bus wires on one end and connect them together.
Disconnect the tN4 bus wires on the other end.
Use an electrical meter to measure for continuity.
If there is no continuity, there is an open circuit fault along the wires. It is recommended
to replace the tN4 bus wires.
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Testing tekmarNet®4 and Stand Alone Wiring
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© 2014 552_D - 09/14
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A Watts Water Technologies Company
Mounting the Thermostat
Push the thermostat front onto
the thermostat base. Installation
is now complete.
Thermostat
Front
Push
Thermostat
Base
The thermostats’s exterior can be cleaned using a damp cloth. Moisten the cloth
with water and wring out prior to wiping the control. Do not use solvents or cleaning
solutions.
Cleaning the Thermostat