DC AQ255 Beknopte handleiding - Pagina 2

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Fig. 6. Strap-on temperature sensor installation.

IMPORTANT

Do not run sensor wires parallel, or close, to

telephone, Ethernet, or power cables. Cross all

power, Ethernet, and telephone wiring at right angles.

If sensor wires are located in an area with strong

sources of electromagnetic interference, or EMI, (e.g.,

if sensor wires are run in the same electrical chase as

line voltage wiring) use twisted pair, shielded cable, or

run wires in a grounded metal conduit.

This is important because the calculated temperature

- based on the sensor's resistance reading - can be

distorted by high EMI, potentially causing the AQ250

to not operate properly.

If using shielded cable or conduit, connect the shield

wire to earth ground only at the AQ250 panel. Do not

ground the shield or conduit at any other location or

electromagnetic shielding will be ineffective. If

shielded cable is used, Honeywell recommends the

use of shielded cable with a continuous ground plane,

such as foil, with an integral drain wire for bonding to

earth ground.

System Demands Wiring

HEAT DEMAND

Wire the Heat Demand (terminals 7 and 8) to a system setpoint

demand (dry contact closure), such as a pool or spa

Aquastat®.

DOMESTIC HOT WATER (OPTIONAL)

If used, wire the DHW (terminals 9 and 10) to the Aquastat or

thermostat on the domestic hot water tank.

M13763

DATA BUS

COMMUNICATION

WIRING

Boiler

DHW

Zone 1

Zone 2

Aux

AQ25042B

Fig. 7. Wiring for communication bus.

AQ250 SERIES HYDRONIC CONTROL PANELS

DHW priority allows only DHW heat for the first 30 minutes of a

call for DHW and then allows the space heating needs to be

added in for the next 30 minutes. This cycle continues until the

call for DHW is satisfied.

NOTE: If the AQ panel is to be connected to a modulating

condensing boiler with built-in DHW management, it

is recommended to use an AQ25A or AQ251 control.

If using an AQ250 panel, it is necessary to install

DPST (Double pole, single throw) relay to close the

DHW Demand on the boiler and the DHW Demand

on the AQ panel based on a call from the DHW

Aquastat.

Low Voltage Outputs Wiring

BOILER

Wire the Boiler dry contact output (terminals 11 and 12) to the

T-T terminals on the boiler Aquastat or the boiler's control

panel. See Fig. 14 on page 11 for wiring connections to a

typical boiler Aquastat.

It is not necessary to use the T-T terminals if connecting to a

Triple Aquastat, since the signal to the Aquastat is received

from the ZR/ZC terminals. See Fig. 14 and Fig. 15 beginning

on page 11 for line voltage connection to boiler Aquastats.

These contacts are made any time the system has a request

for boiler operation. When this occurs, the system's primary

boiler pump comes on.

Communication Bus Wiring

All AQ2000 components communicate with each other on the

AQUATROL network using communication bus wiring. This

wiring must connect all AQ2000 components. Otherwise,

features that depend on this networked communication (e.g.,

zone synchronization) will not function.

The communication bus wiring is polarity insensitive. The

installer does not need to worry about a +ve or –ve orientation

of the wires. If there are two wires connected between the B-B

Bus Exp. In on one module and B-B Bus Exp. Out on another

module, there will be communication. See example in Fig. 7 for

how this wiring is to be installed.

The communication bus connections for AQ250 Control

Panels are pre-wired at the factory.

Zone 3

Zone 4

AQ25744B

Zone 1

Zone 2

Zone 3

Zone 4

M29036A

68-0306—05