tekmar 361 Mixing Control - Manual (Page 12)

Copyright © D 361 -
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 (15 and 17). The indoor sensor is
used by the 361 to measure the room air temperature.
Unoccupied Switch
If an external timer (tekmar Timer 03 2) or switch is used, connect the two wires from
the external switch to the UnO Sw and Com terminals (11 and 12). 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 ac-
curacy. 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
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).
Ω
V
V
1 2
Mixing
Demand
20 to 260 V (ac)
Ω
V
V
3 4
L N
Power
108 to 132 V (ac)
15 16 17
Com Indr Out
13 14
Boil Mix
12
Com
Ω
Ω
V
Timer Switch
11 12
UnO
Sw
Com