Aerco KC Series Instruction Manual download pdf (Page 16)

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2.6.3 BOILER MANAGEMENT SYSTEM

(BMS) MODE

NOTE

BMS Model 168 can utilize either pulse

width modulation (PWM) or RS485

Modbus signaling to the Boiler. BMS II

Model 5R5-384 can utilize only RS485

signaling to the Boiler.

When using an AERCO Boiler Management

System (BMS), the field wiring is connected

between the BMS Panel and each Boiler’s I/O

Box terminal strip (Figure 2-11). Twisted

shielded pair wire from 18 to 22 AWG must be

utilized for the connections. The BMS Mode can

utilize either pulse width modulation (PWM)

signaling, or RS485 Modbus signaling. For PWM

signaling, connections are made from the

AERCO Boiler Management System to the

B.M.S. (PWM) IN terminals on the I/O Box

terminal strip. For RS485 Modbus signaling,

connections are made from the BMS to the

RS485 COMM terminals on the I/O Box terminal

strip. Polarity must be maintained and the shield

must be connected only at the AERCO BMS.

The boiler end of the shield must be left floating.

For additional instructions, refer to Chapter 5,

paragraph 5.6 in this manual. Also, refer to GF-

108M (BMS Model 168) and GF-124 (BMS II

Model 5R5-184), BMS -Operations Guides.

2.6.4 REMOTE SETPOINT and DIRECT

DRIVE MODES

The KC1000 Boiler can accept several types of

signal formats from an Energy Management

System or other source to control either the

setpoint (Remote Setpoint Mode) or firing rate

(Direct Drive Mode) of the Boiler. These formats

are:

4 to 20 mA/1 to 5 Vdc

0 to 20 mA/0 to 5 Vdc

PWM – (Pulse Width Modulated signal. See

paragraph 2.7.4)

Network – (RS485 Modbus. See para. 2.7.7)

While it is possible to control one or more boilers

using one of the above modes of operation, it

may not be the method best suited for the

application. Prior to selecting one of the above

modes of operation, it is recommended that you

consult with your local AERCO representative or

the factory for the mode of operation that will

work best with your application. For more

information on wiring the 4 to 20 mA / 1to 5VDC

or the 0 to 20 mA / 0 to 5 VDC, see paragraph

2.7.3.

2.6.5 COMBINATION MODE

NOTE

Only BMS Model 168 can be utilized for

the Combination Mode, not the BMS II

(Model 5R5-384).

With a Combination Mode unit, field wiring is

between the unit’s I/O Box, the CCP

(Combination Control Panel), and the BMS

Model 168 (Boiler Management System). The

wiring must be done using a shielded twisted

pair of 22 AWG wire. Polarity must be

maintained between the unit, the CCP, and the

BMS. For further instructions and wiring

diagrams, refer to the GF-108 Boiler

Management System Operations Guide and the

CCP-1 data sheet.

2.7 I/O BOX CONNECTIONS

The types of input and output/signals and

devices to be connected to the I/O Box terminals

shown in Figure 2.11 are described in the

following paragraphs.

CAUTION!

DO NOT make any connections to the I/O

Box terminals labeled “NOT USED”.

Attempting to do so may cause equipment

damage.

2.7.1 OUTDOOR SENSOR IN

An outdoor air temperature sensor (AERCO Part

No. 122790) will be required mainly for the

Indoor/Outdoor Reset mode of operation. It can

also be used with another mode if it is desired to

use the outdoor sensor enable/disable feature.

This feature allows the boiler to be enabled or

disabled based on the outdoor air temperature.

The factory default for the outdoor sensor is

DISABLED. To enable the sensor and or choose

an enable/disable outdoor temperature, see the

Configuration menu in Section 3 and Appendix

The outdoor sensor may be wired up to 200 feet

from the boiler and is connected to the

OUTDOOR SENSOR IN and SENSOR

COMMON terminals in the I/O box (see Figs.

2.10 and 2.11). Wire the sensor using a twisted

shielded pair cable of 18-22 AWG wire. There is

no polarity when terminating the wires. The

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