12 of 20
16
Com
17
Out
18
Indr
12
UnO
Sw
13
Com
Timer Switch
13
Com
14
Boil
15
Mix
Power
207 to 253 V (ac)
Mixing
Demand
20 to 260 V (ac)
Indoor Sensor
If an indoor sensor is used, connect the two wires from the sensor
to the
Com
and
Indr
terminals (16 and 18). The indoor sensor is
used by the GEO 360 to measure the room air temperature.
Unoccupied Switch
If an external timer or switch is used, connect the two wires from
the external switch to the
UnO Sw
and
Com
terminals (12 and
13). When these two terminals are shorted together, the control
registers an unoccupied signal.
STEP FIVE
TESTING THE WIRING
Each terminal block
must be unplugged
from its header on the control before power is applied for testing. To remove a
terminal block, pull it straight down from the control.
The following tests are to be performed using standard testing practices and procedures, and should only be carried out by
properly trained and experienced persons.
A good quality electrical test meter, capable of reading from at least 0 - 300 V (ac) and at least 0 - 2,000,000 Ohms, is essential
to properly test the wiring and sensors.
Test The Sensors
In order to test the sensors, the actual temperature at each sensor
location must be measured. A good quality digital thermometer
with a surface temperature probe is recommended for ease of
use and accuracy. Where a digital thermometer is not available,
a spare sensor can be strapped alongside the one to be tested,
and the readings compared. Test the sensors according to the
instructions in the GEO 360 Sensors Data Brochure.
Test The Power Supply
Make sure exposed wires and bare terminals are not in contact
with other wires or grounded surfaces. Turn on the power and
measure the voltage between the
Power L
and
Power N
terminals
(3 and 4) using an AC voltmeter. The reading should be between
207 and 253 V (ac).
Test The Powered Inputs
Mixing Demand
Measure the voltage between the
Mixing Demand
terminals
(1 and 2). When the mixing demand device calls for heat, you
should measure between 20 and 260 V (ac) at the terminals.
When the mixing demand device is off, you should measure
less than 5 V (ac).
