tekmar 284 Boiler Control - Manual (Page 28)

© 2014 284_D - 08/14 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
dc
mA
(+)
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. •
•