Onicon System-30 MODBUS BTU Bedienungsanleitung PDF herunterladen (Seite 14)

11451 South Belcher Road, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax (727) 442-5699 • [email protected]

System-30 BTU Measurement System MODBUS RTU RS485 04/14 - 0583-1 / 18345 Page 14

It is often desirable to totalize the amount of energy transferred in each mode in separate registers.

For these applications, ONICON BTU meters may be congured for dual mode operation. In this

conguration, the meter will measure and totalize energy in separate registers based on the

polarity of the Delta t.

The drawings and tables below illustrate the relationship between meter location, temperature

sensor and mode of operation.

Temperature Sensor/ Mode of Operation Relationship with Meter in Supply Line

Supply Temp Temperature 1 Sensor (Internal Sensor)

Return Temp Temperature 2 Sensor (External Sensor)

Mode 1 Total Heating (Supply Temp > Return Temp)

Mode 2 Total Cooling (Supply Temp < Return Temp)

SYSTEM-30 BTU MEASUREMENT SYSTEM WITH INTEGRAL

FLOW METER & TEMPERATURE SENSORS

0333-2

INCORPORATED

ISOLATION VALVE

Normally Open

ISOLATION VALVE

Normally Open

BYPASS VALVE

Normally Closed

20"

CHILLED WATER

SUPPLY

Y Strainer Upstream

Of Flow Meter

CHILLED WATER

RETURN

CONTROL SYSTEM

BACnet MS/TP

NETWORK

24 VAC POWER

FAN COIL UNIT

AIR HANDLING UNIT

1500 North Belcher Road, Clearwater, FL 33765 • Tel (727) 447-6140 • Fax (727) 442-5699

www.onicon.com • [email protected]

01-13-09

RETURN TEMP

FLOW

DIAGNOSTIC

LED’S

CONTROL SYSTEM

MODBUS RTU

NETWORK

24 VAC POWER

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 45 46

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