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The aurora advanced vs control system cont – WaterFurnace 7 Series User Manual

Page 24

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7 SERIES 50Hz 700A11 INSTALLATION MANUAL

loop temperature in cooling mode, loop temperatures may

be too low to allow proper heating of water. The control will

monitor water and refrigerant temperatures to determine if

conditions are satisfactory for heating water.

VS Drive and Envelope Control

The VS drive operates the compressor between 20 and

100% capacity. The VS drive communicates any out of

refrigerant envelope conditions to the Aurora and will

attempt to adjust the compressor speed to keep within

the envelope. These conditions are measured using the

discharge and suction pressure transducers, discharge

temperature, and current sensors of the drive.

IntelliZone2 Zoning Compatibility
(Optional IntelliZone2 Zoning)

A dedicated input to connect and communicate with the

IntelliZone2 (IZ2) zoning system is provided on P7 on the

AXB control board. There is a dedicated communication port

using a proprietary ModBus protocol. The AXB is standard

on variable speed systems. An AXB can be added to other

selected ABC only systems as well. Then an advanced

communicating IntelliZone2 zoning system can be added

to ABC-only systems. Consult the IntelliZone2 literature for

more information.

Electronic Expansion Valve (EEV)

The electronic expansion valve is operated by the EEV

board and is set to maintain optimal superheat setting

for maximum efficiency. All operation parameters are

communicated to the VS drive and the Aurora system.

Variable Speed Pump

This input and output are provided to drive and monitor

a variable speed pump. The VS pump output is a PWM

signal to drive the variable speed pump. The minimum and

maximum level are set using the AID Tool. 50% and 100%

are the default settings respectively. The VS data input

allows a separate PWM signal to return from the pump

giving fault and performance information. Fault received

from the variable speed pump will be displayed as E16.

Modulating Water Valve

This output is provided to drive a modulating water valve.

Through advanced design the 0-10VDC valve can be

driven directly from the VS Pump output. The minimum

and maximum level are set in the same way as the VS

pump using the AID Tool. 50% and 100% are the default

settings respectively.

Loop Pump Linking

This input and output are provided so that two units can

be linked together with a common flow center. When either

unit has a call for loop outputs, both unit’s loop pump

relays and variable speed pumps are energized. The flow

center then can simply be wired to either unit. The output

from one unit should be routed to the input of the other. If

daisy chained, up to 16 heat pumps can wired and linked

together in this fashion.

Advanced Communication Ports

Communication ports P6 and P8 will provide future

expansion via dedicated protocols. These are for future use.

Smart Grid/On Peak (SG) Input

The 'Smart Grid/On Peak' input was designed to allow

utilities to utilize simple radio controlled switches to

control the On Electric Peak behavior of the 5 and 7 Series

Geothermal Heat Pumps and provide demand reduction.

With a closed contact signal, this input will limit the

operation and thus the power consumption of the unit

by disabling the compressor and electric heat as long as

the signal is present. Code 7 will flash on the Green LED

signifying the 'On Peak' mode. On Peak will also display on

communicating thermostats.

Home Automation 1 and 2 Inputs

The Home Automation inputs are simple closed contact

inputs that will trigger an AID Tool and thermostat alert

for the homeowner. These would require optional sensors

and or equipment for connection to the AXB board. With

two inputs, two different sensors can be selected. The

selected text will then be displayed on the AID Tool and

communicating thermostats. These events will NOT alter

functionality or operation of the heat pump/accessories

and is for homeowner/service notification only.

Home Automation 1 - E23 HA1

With a closed dry contact signal, this input will cause an

alarm and Alert Code 23 to indicate on the stat or flash

on ABC. The AID Tool will allow configuration of this input

between the following selections:

• No Action

• Home Automation Fault [no lockout info only] -

Output from home automation system

• Security Alarm [no lockout info only] - Output from

home security

• Sump Alarm Fault [no lockout info only] - Switch

output from sump sensor

• Smoke/CO Alarm Fault [no lockout info only] -

Switch output from Smoke/CO sensor

• Dirty Filter Alarm [no lockout info only] - Output

from dirty filter sensor

The Aurora Advanced VS Control System cont.