Cleaning The Thermostat - Tekmar 527 Installation & Operation Manual

Testing the Wiring (continued)
Note: It may take 10 seconds for the thermostat display to
turn on once the wires are connected.
If the thermostat display turns on this indicates the
thermostat is operating correctly and there are no electrical
issues.
In the event that the display does not turn on:
1. Remove the front cover from the thermostat.
2. Use an electrical test meter to measure AC voltage
between the tN2 terminals. The AC voltage should
measure 0 V (ac). This thermostat is not compatible
with 24 V (ac) equipment.
3. Use an electrical test meter to measure DC voltage
between the tN2 terminals for 20 seconds.
Testing for Short Circuits
1. Remove the front cover.
2. Disconnect the tN2 wires on one end.
3. Install wire nuts on each wire end to ensure the wire
ends are not touching.
Testing for Open Circuits
1. Remove the front cover.
2. Disconnect the tN2 wires on one end and connect them
together using a wire nut.
3. Disconnect the tN2 wires on the other end.
Testing the Thermostat
This thermostat does not have a relay to turn on the heating.
Using tN2 communication, the thermostat activates a relay
on a tN2 Zone Manager or tN2 Wiring Centre.
1. Lower the Set Room temperature. The "H1" symbol
should not be on the display.
2. Locate the thermostat's zone on the tN2 Zone Manager
or tN2 Wiring Center. The zone LED should be off.
3. Increase the Set Room temperature. The "H1" symbol
should appear.
4. Locate the thermostat's zone on the tN2 Zone Manager
or tN2 Wiring Center. The zone LED should be on.

Cleaning the Thermostat

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.
© 2009 D 527 - 06/09
4. If the DC voltage remains at 0 V (dc):
A) There may be an open or short circuit on the thermostat
wires.
or
B) The thermostat is not connected to tN2 Zone Manager
or tN2 Wire Center.
5. 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 ther-
mostat wires and the tN2 Zone Manager or tN2 Wiring
Center are operating correctly. The thermostat may
have a fault. Contact your local tekmar representative
for assistance.
4. Disconnect the tN2 wires on the other end.
5. Measure for continuity using an electrical meter.
6. If continuity is present, there is a short circuit along the
wires. It is recommended to replace the tN2 wires.
4. Measure for continuity using an electrical meter.
5. If there is no continuity, there is an open circuit along
the wires. It is recommended to replace the tN2 wires.
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LCD Display Segments
H1
Heat