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7 SERIES 700A11 INSTALLATION MANUAL
cycle or after 15 minutes of continuous compressor
operation during the current thermostat demand cycle.
Since compressor hot gas temperature is dependent on
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. 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
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 Slaving
This input and output are provided so that two units can be
slaved 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 slaved
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.
