1212
INSTALLING an ALSRS001S INDOOR Sensor.
Introduction :
The indoor sensor is designed to sense the air temperature
at a remote location and send this information by digital
communications to the thermostat. Any number of sensors
up to six can be connected together to provide temperature
averaging. The sensor can also be modified for use with a
duct sensor.
Single Sensor Installation :
1 - Install the ARTTP thermostat according to the instruction
manual supplied with it. Check that the thermostat is opera-
ting. (Display shows the correct temperature.)
CAUTION : Remove the thermostat from the subbase while
wiring the sensor to avoid damage from live wires. This is
important.
2 - Install non-shielded 3 conductor wire from the thermo-
stat to the remote sensor location. Maximum distance is
(90m).
3 - Open the sensor case by depressing the button on the
bottom edge of the case until the latch releases. Remove
the cover by pulling it out and up at the bottom.
4 - Remove the board from the subbase by pulling back the
latch that holds it at the center bottom.
5 - Use the sensor subbase as a template to mark the
mounting hole locations on the wall. Drill size for the wall
anchors is 6 mm. Mount the subbase over the wires coming
out of the wall using the two screws and anchors provided.
The angled corner on the subbase should be in the bottom
right.
6 - Snap the board back into the subbase. Check to be sure
that the latch holds the board properly. Check that the ther-
mistor (sensor element) is positioned under the holes in the
cover but not touching the cover or subbase.
7 - Strip 6 mm of insulation from the three wires at the
Remote Sensor. Install the wires in the terminals labelled
RS2, RS+V and RS1. Push any extra wire back into the wall
cavity. Seal the hole in the wall around the cable to elimina-
te any draft that might affect the sensor. Refer to Figure 1.)
8 - Note the wire colour going to each terminal. The order of
the wires on the thermostat is not the same as the sensor.
9 - Connect the wires on the thermostat subbase to the ter-
minals labelled RS2, RS1 and RS+V. Make sure that each
terminal on the sensor is wired to the terminal with the same
name on the thermostat.
10 - Mount the thermostat on the subbase and check to be
sure that it is showing the temperature.
11 - Re-install the cover on the remote sensor by hooking it
on the top and snapping the bottom into place.
Using Multiple Sensors for Temperature Averaging :
Any number from two to six sensors may be connected
together to provide temperature averaging in a large area or
several zones being controlled by the same system.
Maximum distance between any 2 sensors is 300 ft. (90m).
1 - Wire the first sensor using the single sensor instructions.
2 - CAUTION : Make sure that there is no power to the sen-
sors by removing the thermostat from the subbase.
3 - Connect wires to each additional sensor in the following
manner. An outdoor sensor can also be connected in an
location in the chain. (Refer to Figure 2 also.)
Thermo- Sensor Sensor Sensor Other
stat 1 2 3 sensor
RS+V RS+V RS+V RS+V
RS2 RS2 RS2 RS2
RS1 RS1 RS1 RS1
AVG AVG AVG
4 - Replace the thermostat on the subbase. Check for pro-
per operation of each sensor by connecting a jumper bet-
ween terminals 1 and 2. This shorts out the thermistor. The
displayed temperature will go up several degrees if the sen-
sor is properly installed. Repeat for each sensor.
Using an ALSDS001S Duct Sensor :
The sensor and thermostat are designed to sense air tem-
perature in a room. The fast moving air in a duct has small
but rapid changes in temperature. This will affect the control
algorithm of the thermostat. For better control, it is recom-
mended that the air temperature is sensed in the room,
however, if a duct sensor is specified, installation is as fol-
lows :
1 - Install the indoor sensor using the Single Sensor ins-
tructions.
2 - Clip the thermistor from the Indoor sensor with wire cut-
ters as shown in Figure 3.
3 - Install the duct sensor in the retum air duct according to
the instructions supplied with it. Connect the two wires from
the duct sensor to terminals 1 and 2 of the indoor sensor. If
shielded cable was required because of a long distance to
the sensor box, connect the shield to terminal 2 also.
Troubleshooting :
Thermostat has no dlsplay : Check wiring between therr-
nostat and sensor. Incorrect wiring can damage the ther-
mostat, transformer or blow a fuse. Check 24VAC supply.
Thermostat reads "AC" : 24VAC power is disconnected.
Not sure if dlsplay Is showing local or remob temperature :
Breathe on the wall near the bottom left corner of the thermo-
stat. Temperature will go up for a few seconds if sensing locally.
Thermostat displays very hlgh temperature : Wires on
sensor element are shorted together. Separate them.
Thermostat displays very low temperature : Check
wiring of probe or duct sensor. Sensor element is not
connected to board or is broken.
Temperature display jumps up and down several
degrees within seconds : Thermostat requires a few
seconds to stabilize after power is turned on. If display
continues to be erratic, there is too great a distance bet-
ween the indoor sensor box and the duct sensor. Move the
box closer to the duct sensor or use shielded cable.
6 - Remote sensors
These thermostats will accept any combination up to a quantity of 6 indoor sensor(s), duct sensor(s) and outdoor
sensor(s). The sensor(s) are connected in a daisy chain to thermostat terminals RS2, RS2 and RS+V, as shown in
the relevant diagrams. The thermostat will recognize automatically, the type and number of sensors fitted.
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