Tekmar 284 - Page 28

© 2016 284_D - 05/16
28 of 60
A Watts Water Technologies Company
No Power
Boil
Ret
20
DHW
21
Com
22
No Power
Boil
In
Vent
23 24 25
Com
Wiring a Boiler Inlet Sensor (tekmar 082) Terminals 24, 25
Wiring a Boiler Return Sensor (tekmar 082) Terminals 20, 22
A single boiler inlet sensor measures the water temperature entering the boilers.
• Connect one wire from the boiler inlet sensor to the Boil In terminal 24.
• Connect the second wire to the Com terminal 25.
No Power
(-)
Out
17
Boil
Sup
18
Com
19
Wiring a Boiler Supply Sensor (tekmar 082) Terminals 18, 19
A boiler supply sensor measures the temperature of water coming from the boiler plant. This sensor should
be installed on the supply pipe ahead of the tees supplying any loads.
• Connect one wire from the boiler supply sensor to the Boil Sup terminal 18.
• Connect the second wire to the Com terminal 19.
A boiler return sensor measures the temperature returning to the boiler plant. This sensor can be installed
on the return side of the primary loop, ahead of the boiler plant piping.
• Connect one wire from the boiler return sensor to the Boil Ret terminal 20.
• Connect the second wire to the Com terminal 22.
No Power
Boil
Ret
20
DHW
21
Com
22
Wiring a DHW Sensor (tekmar 082) Terminals 21 to 22
A DHW sensor is used to measure the temperature of a DHW tank. For indirect DHW heating, the DHW sensor
can be used instead of a DHW aquastat. For direct DHW heating, only the DHW sensor can be used to control the
temperature of the DHW tank.
• Connect one wire from the DHW sensor to the DHW terminal 21.
• Connect the second wire to the Com terminal 22.
20V
11
dc
Out In
mA
12
(+)
Flow
Sensor
20V
11
dc
Out In
mA
12
(+)
Flow
Sensor
Wiring a Flow Sensor Terminals 11, 12
An analog flow sensor can be connected to the 284 to provide flow monitoring. The control supports a
4-20 mA style sensor. Examples of compatible aftermarket flow sensors include the Kele SDI series, 2200
& 3100 series and 200 series (requires 310 transmitter). Using the boiler supply sensor & the boiler return
sensor, energy output can be calculated & displayed from the flow measurement. The flow sensor can also
be used to prove primary pump flow.
• Connect one wire from the flow sensor to the 20 V dc Out terminal 11.
• Connect the second wire to mA (+) In terminal 12.