tekmar 284 Boiler Control - Manual (Page 29)

© 2014 284_D - 08/14 29 of 60 A Watts Water Technologies Company
5V
dc
Out
Pressure
Sensor
In
+
14
Vdc
-
15
Gnd
13
Wiring a Pressure Sensor Terminals 13 to 15
An analog pressure sensor can be connected to the 284 to provide water pressure monitoring. The
control supports a V (dc) style pressure sensor with a signal range of 0.5 to 4.5 V (dc). Examples
of compatible aftermarket pressure sensors include the Honeywell PX2 (AA) series and the
Measurement Specialties 7100 series.
Connect one wire from the power supply (+5 VDC) on the pressure sensor to the 5V dc Out
terminal 13.
Connect one wire from the pressure signal on the pressure sensor to the Vdc (+) In terminal 14.
Connect one wire from the GND (0V) on the pressure sensor to the Gnd (-) terminal 15. •
•
•
No Power
Boil
In
Vent
23 24 25
Com
Wiring a Vent Sensor Terminals 23, 25
A vent sensor can be connected to the 284 to provide monitoring of the common boiler plant exhaust vent temperature.
Compatible sensors include a 10K ohm NTC curve J thermistor.
The control is capable of displaying temperatures up
to 500 ° F (260 ° C). The vent sensor can also be used to provide a vent temperature limiting feature.
Connect one wire from the vent sensor to the Vent terminal 23.
Connect the second wire to the Com terminal 25. •
•
+ -
EMS
No Power
Com
Out
17
Boil
Sup
18
-
19
In
EMS
+
16
EMS Connection Terminals 16, 19
Modbus ® Connection Terminals 40 to 42
BACnet ® Connection RJ45 Plug
A Building Automation System (BAS) can be connected to the 284 for remote
monitoring & adjustment capability. BACnet
® IP communications use an
ethernet socket. Use a CAT-5E or CAT-6 cable. The maximum recommended
cable length for CAT-5E is 150 ft. (45.7 m) & 300 ft. (91.4 m) for CAT-6.
Connect the Ethernet RJ45 socket on the BACnet ® IP network to the
Ethernet RJ45 socket on the 284.
•
A Building Automation System (BAS) can be connected to the 284 for remote monitoring
& adjustment capability. Modbus
® communications use an RS 485 connection. Use
18 AWG Twisted Shielded Pair cable. Cable length is dependent on the baud rate &
whether or not terminating resistors are used. Refer to the BAS Integration Manual
284_B for details on the maximum recommended cable length.
Connect the B (+) terminal on the BAS network to the RS 485 B (+) terminal 40.
Connect the A (-) terminal on the BAS network to the RS 485 A (-) terminal 41.
Connect the ground (G) terminal on the BAS network to the Gnd terminal 42. •
•
•
An Energy Management System (EMS) can be connected to the 284 to provide a target water
temperature. Either a 0 to 10 V (dc) or 2 to 10 V (dc) signal may be used.
Connect one wire from the EMS to the EMS (+) In terminal 16.
Connect a second wire from the EMS to the Com (-) terminal 19.
A 0 - 20 mA signal can be converted to a 0 - 10 V (dc) signal by installing a 500 Ω resistor in
parallel between the Com (-) & EMS (+) In terminals (19 & 16). The EMS Signal setting must
be set to 0-10.
•
•
BACnet
Network
Switch
Boiler
Control 284
EMS, Modbus ® & BACnet ® Connections
B A G
Master
284
40 41 42
Gnd
+ –
RS 485
B A
(+) (-)
A 4 - 20 mA signal can be converted to a 2 - 10 V (dc) signal by installing a 500 Ω resistor in parallel between the Com (-) &
EMS (+) In terminals (19 & 16). The EMS Signal setting must be set to 2-10.
The APP MODE setting in the Setup Menu must be set to EMS.