AERCO Adding a Communications Board to ECS User Manual

2006-03

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INTERNATIONAL, INC.

159 PARIS AVENUE • NORTHVALE, NJ 07647 • PHONE [phone]

PROCEDURE FOR ADDING A COMMUNICATIONS BOARD TO

ECS TEMPERATURE CONTROLLER

Parts Needed:

a. Control Box Assembly ECS, P/N: 69012-[ ]
b. Temperature Indicating Controller, P/N: 64008
c. Communications Board, P/N: 64009-[ ]

Procedure:

1. Turn off power to Control Box Assembly ECS (P/N 69012-[ ])

2. Slide out Temperature Indicating Controller (P/N: 64008) from Control Box Assembly
by gently pushing the indicated latching ears to the side (See Figure 1)

LATCHING
EARS

Figure 1

3. Slide Communications Board (P/N 64009-[ ]) into Temperature Indicating Controller
slot (COMMS 1). See Figure 2. Make sure to push Communications Board all the
way in to ensure it is firmly seated in its slot.

COMMUNICATIONS

BOARD

Figure 2

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May 30, 2006

4. Place Temperature Indicating Controller back into Control Box Assembly and power
up unit. The following screen will appear. (See Figure 3)

Page

Button

Scroll

Button

Figure 3

Up/Down
Arrow Keys

5. The Controller will report a hardware error as indicated on Figure 3. Press the ▲(up)
arrow key located on the right side of the Temperature Controller until “8” appears
on the lower half of the screen.

6. Press the page button located on the left side of the Temperature Indicating
Controller until “Exit” appears on the top half of the screen.

7. Press the ▲ / ▼ (up/down) arrow key to choose “yes”.

8. Wait a moment as the screen updates. The hardware error will no longer be
displayed.

9. This completes installation of the Communications Board.

10. Next, turn off power and proceed to the wiring instructions provided in the next
section.

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MODBUS COMMUNICATIONS WIRING CONNECTIONS

Following installation of the Communications Board, wiring connections must be made
on the rear of the 2408 Controller to permit Modbus control by an Energy Management
System (EMS), Building Automation System (BAS), or Computer being used with the
Controller. To access the 2408 Controller wiring terminals and make the required wiring
connections, proceed as follows:

1. With the Control Box door open, loosen the captive screw at the top of the recessed
panel shown in Figure 4.

CAPTIVE SCREW

(LOOSEN TO OPEN)

PT.NO.

2408

OP 1

OP 2

F

SET

SP2

REM

AUTO

RUN

MAN HOLD

TEMP CONTROLLER

B-PLUS

OVER TEMP SWITCH

TM

WATER HEATER

PT.NO.

Figure 4

2. Swing down the recessed panel to access the wiring terminal connections on the
rear of the 2408 Controller sleeve (Figure 5).

3. Refer to Table 1 and connect the appropriate wire leads to Temperature Controller
terminals listed.

CAUTION

DO NOT route Modbus communication wiring in the same
conduit as power wiring. Attempting to do so may result in
excessive noise on the signal lines. Also, ensure that the
RS232 or RS485 signal lead connections do not exceed the
following lengths:

• RS232 Wiring: 50 Feet Maximum

• RS485 Wiring: 4,000 Feet Maximum

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NOTE

AERCO recommends that shielded, twisted-pair cable be
used for communication wiring. Examples of suitable wiring
are : Belden 9841, 8761, 3105A, or equivalent.

Figure 5

Table 1. Modbus Communication Signal Connections

COMPUTER CONTROL CABLE

2408 TEMP. CONTROLLER

SIGNAL

NAME

GROUND HD GROUND 5 7 GROUND

RECEIVE HE TRANSMIT 3 2 A+

TRANSMIT HF RECEIVE 2 3 B-

PIN NO.

RS232/9-PIN RS232/25-PIN RS485

SIGNAL

NAME

PIN NO.

PIN NO.

PIN NO.

4. After the appropriate wire leads have been connected, close and secure the swing­down panel and close the Control Box door. This completes the installation of the
Communications Board.

5. For additional information and documentation on the 2408 Controller, refer to the
Eurotherm Website at the following address:

www.eurotherm.com/products/controllers/2400_doc.htm

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