Geostar ASTON Series Installation Manual page 22

ASTON & ASTON ADVANCED DUAL-CAPACITY OUTDOOR SPLIT SERIES INSTALLATION MANUAL
The Aurora 'Base' Control System cont.
Over/Under Voltage Shutdown - An over/under voltage
condition exists when the control voltage is outside the
range of 18 VAC to 30 VAC. If the over/under voltage
shutdown lasts for 15 minutes, the lockout and alarm relay
will be energized. Over/under voltage shutdown is self-
resetting in that if the voltage comes back within range
of 18 VAC to 30 VAC for at least 0.5 seconds, then normal
operation is restored.
Operation Description
Power Up - The unit will not operate until all the inputs and
safety controls are checked for normal conditions. The unit
has a 5 to 80 second random start delay at power up. Then
the compressor has a 4 minute anti-short cycle delay after
the random start delay.
Standby In standby mode, Y1, Y2, W, DH, and G are not
active. Input O may be active. The blower and compressor
will be off.
Heating Operation
Heating, 1st Stage (Y1) (Dual Capacity Compressor and
Variable Speed ECM) - The blower is started on "G" speed
immediately and the compressor is energized 10 seconds
after the Y1 input is received. The ECM blower motor is
switched to low speed 15 seconds after the Y1 input.
Heating, 1st Stage (Y1) (Dual Capacity Compressor and
5 Speed ECM) - The blower is started on "Y1" speed
immediately and the compressor is energized 10 seconds
after the Y1 input is received.
Heating, 2nd Stage (Y1, Y2) (Dual Capacity Compressor
and Variable Speed ECM) - The compressor will be staged
to full capacity 20 seconds after Y2 input is received. The
ECM blower will shift to high speed 15 seconds after the Y2
input is received.
Heating, 2nd Stage (Y1, Y2) (Dual Capacity Compressor
and 5 Speed ECM) - The compressor will be staged to full
capacity 20 seconds after Y2 input is received. The 5 speed
ECM blower will shift to Y2 speed immediately.
Heating, 3rd Stage (Y1, Y2, W) (Dual Capacity Compressor
and Variable Speed ECM) - The first stage of electric heat
is energized 10 seconds after the W command is received.
If the demand continues the second stage of electric heat
will be energized after 5 minutes.
Heating, 3rd Stage (Y1, Y2, W) (Dual Capacity Compressor
and 5 Speed ECM) - The first stage of electric heat is
energized 10 seconds after the W command is received.
Blower will increase to "W' speed immediately. If the
demand continues the second stage of electric heat will be
energized after 5 minutes.
Emergency Heat (W) - The blower will be started on "G"
speed, 10 seconds later the first stage of electric heat will
be turned on. 5 seconds after the first stage of electric
heat is energized the blower will shift to Aux speed. If the
emergency heat demand is not satisfied after 2 minutes the
second electric heat stage will be energized.
Cooling Operation
In all cooling operations, the reversing valve directly tracks
the O input. Thus, anytime the O input is present, the
reversing valve will be energized.
Cooling, 1st Stage (Y1, O) (Dual Capacity Compressor and
Variable Speed ECM) - The blower is started on "G" speed
immediately and the compressor is energized 10 seconds
after the Y1 input is received. The ECM blower motor is
switched to low speed 15 seconds after the Y1 input.
Cooling, 1st Stage (Y1, O) (Dual Capacity Compressor
and 5 Speed ECM) - The blower is started on "Y1" speed
immediately and the compressor is energized 10 seconds
after the Y1 input is received.
Cooling, 2nd Stage (Y1, Y2, O) (Dual Capacity Compressor
and Variable Speed ECM) - The compressor will be staged
to full capacity 20 seconds after Y2 input is received. The
ECM blower will shift to high speed 15 seconds after the Y2
input is received.
Cooling, 2nd Stage (Y1, Y2, O) (Dual Capacity Compressor
and 5 Speed ECM) - The compressor will be staged to full
capacity 20 seconds after Y2 input is received. The 5 speed
ECM blower will shift to Y2 speed immediately.
Emergency Shutdown - Four (4) seconds after a valid ES
input, P2-7 is present, all control outputs will be turned off
and remain off until the emergency shutdown input is no
longer present. The first time that the compressor is started
after the control exits the emergency shutdown mode,
there will be an anti-short cycle delay followed by a random
start delay. Input must be tied to common to activate.
Load Shed - The LS input disables all outputs with the
exception of the blower output. When the LS input has been
cleared, the anti-short cycle timer and random start timer
will be initiated. Input must be tied to common to activate.
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