Weil-McLain BMC-6X operation manual External 4-20MA SET Point Using 4-20MA EMS Interface

BMC and BMC-6X Installation and Operation Manual

MULTIPLE MODULATING BOILERS

EXTERNAL 4-20MA SET POINT

USING 4-20MA EMS INTERFACE

				BMC
			SYSTEM	Full Modulation Sequencing Control
OUTPUT RATINGS:
120VAC, 6A RESISTIVE			A
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:			B	---	---
115VAC 60Hz , 30VA MAX
USE COPPER WIRE,			C
CLASS 1 WIRE ONLY.
C	US		D
	ENCLOSED
	ENERGY
	MANAGEMENT	CAUTION: RISK OF ELECTRIC SHOCK
	EQUIPMENT
	LISTED	More than one disconnect switch may be required
	99RA	to de-energize the equipment before servicing.

420MOD EMS Interface

PWR
L	N
1	2

L

N

L

N

SYS			A		B		C	D
3	4	5	6	7	8	9	10 11 12
		Boiler 1			2
		System Pump			Boiler	3
						Boiler		Boiler 4

PROGRAM

RUN

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

A

B

C

D

OUTDOOR

SYSTEM

SYSTEM

SHUTDOWN

/TSTAT

CUR / VLT

CUR / VLT

CUR / VLT

CUR / VLT

TEMP

TEMP

PROVE

/SETBACK

GND

mA

VLT

GND

mA

VLT

GND

mA

VLT

GND

mA

VLT

T

O

T

O

O

O

-

+

+

-

+

+

-

+

+

-

+

+

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

Boiler 1	Boiler 4	SystemSensor	JumperProve removeNotDo
Boiler2	Boiler3

4 - 20 mA

Signal Outputs

EXTENSION MODULE

RS-485

				420MOD
4-20mA INPUT					RS485
+	Signal		GND		EXTENSION
1		2	3		CONNECTORS

To EMS/BMS

4-20mA Set Point

31