The tekmarNet® Thermostat 557 is a
communicating touchscreen thermostat
designed to operate either: a hydronic
radiant floor with a two stage heat pump
(water-to-air or air-to-air) for heating
& cooling and an emergency backup
heating system; or two stages of heating
and two stages of cooling. There are
three auxiliary sensor inputs that can
be used to measure room, floor, outdoor
or duct temperature. The optional floor
sensor allows precise heating of radiant
floors. Relative humidity level can be
measured and controlled using either
the built-in or external humidity sensor.
The large touchscreen display allows
you to easily adjust 7-day programmable
schedules and room temperatures to
optimize comfort and energy savings.
The 557 can connect to tekmarNet®
controls using two or four wires or it can
operate as a stand-alone device.
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.
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
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It is the installers responsibility to ensure that this thermostat is safely installed
according to all applicable codes and standards.
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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
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are intended and certified as safety limits must be placed into the control circuit.
Do not attempt to service the thermostat. There are no user serviceable parts inside
the thermostat. Attempting to do so voids warranty.
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.
Removing The Wiring Cover
To remove the thermostat’s wiring cover:
Locate the slotted hole on the right
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side of the thermostat.
Insert a screwdriver in the slotted hole
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to depress the latch.
Remove the wiring cover from the
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thermostat.
Mounting The Thermostat
If a single gang box is used:
Feed the wiring through the large
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holes of the thermostat.
Fasten the base of the thermostat to
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the gang box using two screws.
Terminate wiring to the wiring strip.
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Re-install the wiring cover.
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Thermostat
1
/
3
”
4
(83 mm)
Wiring
Cover
Stud
Switch Box
If a gang box is not used:
Feed the wiring through the large
•
holes in the thermostat.
Use screws in the screw holes to
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fasten the thermostat to the wall.
At least one of the screws should
enter a wall stud or similar rigid
material.
The thermostat operates a single heating system zone and can be wired in three
different ways.
Stand Alone
- Similar to tekmarNet®4 wiring with tN4 wiring terminal not used. First
stage heating relay (Rh1 - W1) can be wired directly to switching relays.
tekmarNet®4 - Allows the thermostat to be wired using 4 wires to a tN4 Wiring Center
or Zone Manager point-to-point. Alternatively, the thermostat can operate the heating
and cooling equipment locally and the tN4 communication bus can be daisey-chained
from one thermostat to another.
®
tekmarNet
2 - Allows the thermostat to be wired point-to-point using 2 wires to a tN2
Wiring Center, House Control, or Zone Manager. This allows easy wiring for retrofit
applications.
Application specific wiring diagrams are provided in the 557_A brochure.
Compatible Sensors
The thermostat is compatible with Indoor Sensor type 076, 077, 084, Slab Sensor
type 072, 073, 079, Outdoor Sensor type 070, Duct Sensor type 083 and Humidity &
Temperature Sensor type 086.
Testing the Thermostat Wiring
Only qualified personnel should perform testing procedures. A licensed electrician
is recommended.
Testing tekmarNet®2 Wiring
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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 wiring cover.
2. Check to ensure that the tN2 wires on the thermostat are connected to a zone on a
House Control, Wiring Center, or Zone Manager.
3. 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
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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
4. If the thermostat display is off, or is cycling on and off, move the thermostat to the
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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
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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
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be a fault on the thermostat.
If a fault is suspected, contact your tekmar sales representative for assistance.
Testing tekmarNet®4 and Stand Alone Wiring
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 Relay Outputs
The thermostat includes a User Test to check if the thermostat’s relays are operating
and that the thermostat is wired correctly to the HVAC equipment. The User Test setting
can be located in the Toolbox menu. Either Heat or Cool test can be selected.
Cancel button - Exits the user test and returns the Toolbox menu.
Hold button - Pauses the user test step for up to 5 minutes.
Next Item button - Advances the user test to the next test step.
Heat TestCool Test
StepRelay(s) ClosedStepRelay(s) Closed
O Relay OFFRc-O/B is openedO Relay ONRc-O/B
B Relay ONRc-O/BB Relay OFFRc-O/B is opened
FanRc-GFanRc-G
Y1 HeatRc-Y1 and Rc-GY1 CoolRc-Y1 and Rc-G
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User Test Sequence
--------------------------
Y2 HeatRc-Y1 and Rc-Y2 and
Rc-G
W2 HeatRh2-W2W2 CoolRh2-W2
W1 HeatRh1-W1Humidify*ACC-ACC
Humidify*ACC-ACCDehumidify*ACC-ACC or Rc-Y2
Dehumidify*ACC-ACC or Rc-Y2HRV*Rc-Y2
HRV*Rc-Y2Valve*ACC-ACC or Rc-Y2
Valve*ACC-ACC or Rc-Y2
*availability of test step and additional relay closures based upon Setup menu settings.
Thermostat is locally locked and the access level cannot be changed.
Set to Lock when installation has been completed.
UNLOCK ACCESS LEVEL
Thermostat is unlocked and the access level may be changed. Go to
the Toolbox menu to change the access level. Set to Unlock during
the installation process.
tekmarNet® system controls include a Global Lock that locks all
connected thermostats. Set the tekmarNet® system control to unlock
to allow access level adjustment on all connected thermostats.
Conditions: Sensor 1, 2 or 3 is set to Floor, & W1
Terminal is set to HRF1, HRF2 or Othr.
Range: 40 to 122°F (4.5 to
50.0°C), OFF
Default: 85°F (29.5°C)
TEMPORARY HOLD
Temperature adjustment in the home menu
can result in either permanent temperature
setting change or temporary temperature setting
change that lasts 3, 6, 9, 12 hours or until the
next scheduled event.
Access Level: InstallerRange: OFF or ON
Conditions: NoneDefault: OFF
Set the minimum percentage the fan should operate
while in the event. This provides ventilation for the
building. Each 10% is 6 minutes per hour.
Access Level: Installer, UserRange: Auto, 10 to 90%, ON
Conditions: Always available. 10 to 90% available
when Ventilation Mode is On.
FAN
Set the minimum percentage the fan should operate while
in the event or Away scene. This provides ventilation
for the building. Each 10% is 6 minutes per hour.
Access Level: Installer, UserRange: Auto, 10 to 90%, ON
Conditions: Schedules used or Scenes set to Guest or
10 to 90% available when Ventilation Mode is On.
All.
HUMIDITY MINIMUM
Set the minimum humidity level during the event.
Access Level: Installer, UserRange: OFF, 20 to 80%
Conditions: Humidify Mode set to HM1, 2, 3.Default: 40%
HUMIDITY MAXIMUM
Set the maximum humidity level during the event.
Default: Auto
Default: Auto
Access Level: Installer, UserRange: 20 to 80%, OFF
Conditions: Dehumidify Mode set to DHM1, 2, 3, 4, 5. Default: 60%
HUMIDITY MAXIMUM AWAY
Set the maximum humidity level during Away scene.
Access Level: InstallerRange: 20 to 80%, OFF
Conditions: Dehumidify Mode set to DHM1, 2, 3, 4, 5. Default: OFF
HUMIDITY
Select if the humidification or dehumidification system
should operate during the event or away scene.
Access Level: InstallerRange: OFF or On
Conditions: Humidity Mode set to DHM1, 2, 3 or
Dehumidity Mode set to DHM1, 2, 3, 4, 5.
Default: OFF
Time Menu (1 of 2)
SettingDisplay
MINUTES
Select the current time minutes.
Access Level: Installer, UserRange: 00 to 59
Conditions: Always available.Default: 00
The schedule menu can operate on a 24 hour or 7 day repeating schedule. When a
24 hour schedule is selected, “SuMoTuWeThFrSa” is shown on the top of the screen
to show that the event time applies to all days of the week. When a 7 day schedule
is selected, each individual day of the week is shown with the event time.
SettingDisplay
EVENT 1
The first programmable schedule time period of
the day. The
temperature settings are used
during this time period.
Access Level: Installer, User
Conditions: Schedule setting is set to Zone or
Master 1, 2, 3, 4 and Event/Day is set to 2 or 4.
EVENT 2
The second programmable schedule time period
of the day. The temperature settings are used
during this time period.
Access Level: Installer, User
Conditions: Schedule setting is set to Zone or
Master 1, 2, 3, 4 and Event/Day is set to 2 or 4.
EVENT 3
The third programmable schedule time period
of the day. The temperature settings are used
during this time period.
Access Level: Installer, User
Conditions: Schedule setting is set to Zone or
Master 1, 2, 3, 4 and Event/Day is set to 4.
EVENT 4
The fourth programmable schedule time period
of the day. The temperature settings are used
during this time period.
Access Level: Installer, User
Conditions: Schedule setting is set to Zone or
Master 1, 2, 3, 4 and Event/Day is set to 4.
SuMoTuWeThFrSa
Range: 12:00 AM to 11:50 PM, SKIP
or 00:00 to 23:50, SKIP
Default: 6:00 AM
SuMoTuWeThFrSa
Range: 12:00 AM to 11:50 PM, SKIP
or 00:00 to 23:50, SKIP
Default:
10:00 PM when Event/Day is 2
8:00 AM when Event/Day is 4
SuMoTuWeThFrSa
Range: 12:00 AM to 11:50 PM, SKIP
or 00:00 to 23:50, SKIP
Default: 6:00 PM
SuMoTuWeThFrSa
Range: 12:00 AM to 11:50 PM, SKIP
or 00:00 to 23:50, SKIP