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© 2011
D 538 - 12/11
Mounting the Thermostat
To place the thermostat back on the
mounting base:
Place thermostat bottom tabs on
matching mounting base notches.
Pivot top of the thermostat
towards wall, ensuring wires clear
obstructions.
The top clasp makes a clicking
sound when properly closed.
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Pivot
Tab
Testing the Heat Relay
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1. Remove the front cover from the thermostat.
2. Press the
button and set the heating temperature below the current room
temperature. There should be no H1 symbol on the display.
3. Set the electrical test meter to continuity.
4. Place probes between R (3) and W (4). There should be no continuity. If there
is continuity then there may be a wiring fault or the relay may be faulty.
5. Press the
button and set the heating temperature above the current room
temperature. Make sure the display does not show “WWSD”. The “H1” symbol
should appear on the display.
6. There should be continuity between the R (3) and W (4) terminals.
Testing the tekmarNet
®
4 Bus
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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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