wirsbo proMIX 101, Руководство по установке

Страница: 22 / 56

INSTALLATION - STEP 7
TESTING THE WIRING
NOTE: The following tests are to be performed
using standard testing practices and procedures.
They should only be carried out by properly
trained and experienced persons.
IMPORTANT!
– Things to note
before you start ANY testing:
• Before supplying power for testing, each terminal block
must be unplugged from its header on the control
• To remove the terminal block, pull straight down from
the control (See fig. a)
• The following tests should only be carried out by
properly trained and experienced persons
• When testing, use standard testing practices and
procedures
• To properly test wiring and sensors a good quality
electrical test meter, capable of reading at least 0 – 300
VAC and at least 0 – 2,000,000 Ohms is essential
Test The Sensors
To test the sensors, the actual temperature at each sensor
location must be measured.
A good quality test meter capable of measuring up to 5,000 k
Ω
(1 k
Ω
= 1000
Ω
) is required to measure the sensor resistance.
In addition to this, the actual temperature must be measured
with either a good quality digital thermometer, or if a
thermometer is not available, a second sensor can be placed
alongside the one to be tested and the readings compared.
First measure the temperature using the thermometer and
then measure the resistance of the sensor at the control. The
wires from the sensor must not be connected to the control
while the test is performed. Using the chart on page 19,
estimate the temperature measured by the sensor. The sensor
and thermometer readings should be close. If the test meter
reads a very high resistance, there may be a broken wire, a
poor wiring connection or a defective sensor. If the resistance
is very low, the wiring may be shorted, there may be moisture
in the sensor or the sensor may be defective. To test for a
defective sensor, measure the resistance directly at the sensor
location.
Do not apply voltage to a sensor at any time as damage
to the sensor may result.
20
INST
ALLA
TION
INSTALLATION - Step 7 - Testing the Wiring
11 12
14
13
UnO
Sw
Com BRet
S3
Mix
S1
a