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2
INSTALLING THE DT92E ROOM THERMOSTATS
2.1 Locating DT92E
This pack contains 2 x DT92E room thermostats for location in each control zone. The DT92E for Zone 1 has
a zone ID label number 1 under the battery cover. The other DT92E has zone ID label 2. These thermostats
must be located in the correct zone to ensure the correct valve is operated in response to their commands.
For best performance, install each DT92E in an open space where it can sense the room temperature, and
where the signal strength is high.
The Room Thermostats can be mounted on a wall or on the optional table stand. Do not mount on metal
wall-boxes.
Leave at least 30cm distance from any metal objects and at least 1 metre from any other electrical equipment.
Select the preferred location and test the Signal Strength before installation.
2.2 Powering Up DT92E
DT92E is supplied in the pack with the mounting plate separated from the rest of the unit for ease of installation. The next sequence of operations
should be done before mounting DT92E onto its mounting plate.
First hold DT92E between 1 and 2 meters away from ST9520C. To power it up, unclip the battery cover and then remove the paper tab that isolates
the batteries from their contacts. When the display powers up the battery cover should be clipped back on.
Immediately on power up, DT92E will try to communicate and
synchronise with ST9520C. This process may take up to 4 minutes, and
will be indicated by the word 'Sync' on the DT92E display.
When 'Sync' disappears from the display, DT92E is ready for a test of
the RF signal strength between it and the ST9520C programmer.
Now go to section 2.3 to conduct the Signal Strength Test.
2.3 DT92E Signal Strength Test
Honeywell 2-way RF communications allows signal strength testing to
ensure DT92E can be positioned in the best possible location.
To enter Signal Strength Test:
a.
Hold down the
button for 2 seconds until the
displayed.
b.
Hold down the
and
buttons together for 3 seconds until 'Inst'
appears in the display.
c.
Press the
button ('Cont' is now displayed)
d.
Hold the
button for 3 seconds to enter Test mode.
e.
Signal Strength Test is entered from Test mode by holding the
button for 3 seconds, until the display shows 'SS'.
ST9520C measures the strength of the DT92E signal every 5-10
seconds and will communicate this to DT92E as a number between
0 and 5. The value drops to 0 briefly as each new signal strength
measurement is made.
A signal strength of 3 or more is recommended to ensure reliable
communications.
Step 1
Hold DT92E between 1 and 2 meters away from ST9520C and check the signal strength is high
(3 or more). This confirms the two units are in the condition they left the factory and are bound
together, and you can move to Step 2.
If the signal strength is shown as 0, the units are possibly not bound together. Go to the
section 6 Binding / Rebinding, follow the procedure there, and then repeat the complete
Signal Strength Test sequence.
Step 2
Whilst staying in Signal Strength Test mode, take the DT92E to the preferred location. Wait for
10 seconds and check the signal strength is 3 or more. If so, the DT92E is ready to mount.
If the signal strength is less than 3, re-position the room thermostat within the local area +/- 1 or
2m to see if the signal strength improves. If this fails, try to reduce the range/distance between
the room thermostat and the ST9520C.
Exit Signal Strength Test by holding the
symbol is
button for 5 seconds. The DT92E will timeout of this mode after 10 minutes.
6
Zone ID Number (1 or 2)
2 s
3 s
10 s
= 3, 4, 5
Strong signal,
proceed to
mount the Room
Thermostat.
1 .2 m
1
2
3 s
3 s
= 0, 1, 2
Poor signal,
reposition Room
Thermostat.
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