Lochinvar Harmony Manuale Utente Scaricare il pdf (Pagina 5)

CONNECTING AN EXTERNAL SET POINT

(4-20mA EMS-CONTROL)

• The Harmony can take a 4-20mA signal from an Energy Manage-

ment System (EMS) or other signal source to change the set point

remotely (see pg. 28 for additional details).

• The signal must be a two-wire 4-20mA.

• A system sensor must be installed as described in the previous

section.

• The External Set Point must be set up correctly (see pg. 12). These

settings will allow the Harmony to read and monitor the system

temperature and also monitor the 4-20mA input to remotely adjust

the Harmony set point to the desired value.

• The Harmony can source the current for the 4-20mA input. It

provides an excitation voltage of 24VDC. If using the Harmony to

source the power, attach the (+) side of the 4-20mA input to the

Harmony EMS terminal marked +. Attach the (-) side of the 4-20mA

signal to the EMS terminal marked SIGNAL.

• If the EMS or other signal sources the current (provides the

excitation voltage), attach the (+) side of the 4-20mA input to the

Harmony EMS terminal marked SIGNAL. Attach the (-) side of the

4-20mA input to the EMS terminal marked SHIELD.

WIRING THE SHUTDOWN

• This feature can be used whenever it is desirable to turn off the

Harmony from a remote location or another controller.

• A typical use for this feature would be to turn off all boiler stages

when an EMS panel no longer requires heat in the system.

• When the Shutdown feature is enabled by closing a dry contact, all

active stages will immediately modulate down to low. They will

remain in low for 45 seconds and then turn off.

• If the System Output relay was active, it will remain active until the

System Delay is over, then it will also turn off.

• The Shutdown signal must be a dry contact only. No voltage can

be placed across the SHUTDOWN terminals.

• Bring the two wires from the dry contact to the terminals marked

SHUTDOWN- A3, A4.

WIRING THE SYSTEM PROVE

EMS INPUT

SIGNAL

SHIELD

Harmony Sources Curren

24VDC Excitation Voltage

(+)

(-)

EMS

Input

EMS Sourcing Current

EMS INPUT

SIGNAL

SHIELD

(+)

(-)

EMS

Input

INSTINST

INST

ALLAALLA

ALLA

TIONTION

TION

INPUT WIRINGINPUT WIRING

INPUT WIRING

Dry Contact

Shutdown

Signal

TEMP

SHUTDOWN

NETWORK

SYSTEM

PROVE

INPUTS

A10

1 2 3 4 5 6 7 8 9 10 ... 31 32

Commenti su questo manuale

Nessun commento

Lochinvar Harmony Manuale Utente Pagina 5

Commenti su questo manuale

Prodotti e manuali riguardandi no Lochinvar Harmony