tekmar 360 Mixing Control - Manual (Page 12)

© 2009 D 360 - 03/09 12 of 20
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 360 to measure the room air temperature.
Unoccupied Switch
If an external timer (tekmar Timer 032) or switch is used, connect
the two wires from the external switch to the UnO Sw and Com ter-
minals (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 accu-
racy. 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 Data
Brochure D 070.
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 108 and 132 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 mea-
sure between 20 and 260 V (ac) at the terminals. When the mixing
demand device is off, you should measure less than 5 V (ac).
16
Com
17
Out
18
Indr
12
UnO
Sw
13
Com
Timer Switch
13
Com
14
Boil
15
Mix
L N
4 3
Power
V 108 to 132 V (ac)
1 2
Mixing
Demand
V
20 to 260 V (ac)