ASTON LOW SILL SERIES
C O M M E R C I A L
U N I T S
AFFORDABLE RENEWABLE CLEAN
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Table of Contents
Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
AHRI Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
The Aston Series Low Sill Console. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Inside the Aston Series Low Sill Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Water Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Installation Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Blower Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Pressure Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Antifreeze Corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Correction Factor Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Reference Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Legend and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Engineering Guide Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Revision Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Model Nomenclature
1-3
4
5-6
7
8
9
10
11
12
13
14
15
16-17
18
GCL
S
09
L
0
1
1
C
N
N
B
5
SS
*
Vintage
* - Factory Use Only
Model Type
ype
GCL – Aston
n Series
Low Si
S
Sill
ill Consol
Console
e
Non-Standard Options
SS – Standard
Cabinet Conf
Configuration
fig
g
guration
C – Chassis
hassiss Only
O
hassiss with
w Cabinet
W – Chassis
S – Chassis
hassiss with
w Slope Top
Air Coil/Insulation Option
5 – AlumiSealTM/Extended Range
6 – AlumiSealTM/Standard Range
7 – No Coating/Extended Range
8 – No Coating/Standard Range
Unit Capacity
pacity
y
18
09, 12, 15, 18
Sound Kit
A – None
B – Blanket
Piping Option
n
L – Left
ft
ght
R – Right
Future Option
N – None
Voltage
0/60/1
0 – 208-230/60/1
2 – 265-277/60/1
7/60/1
9 – 115/60/1
1 (09 & 12 Only)
Future Option
N – None
Unit Control
1 – CCM
A – AuroraTM Base Control (ABC)
Coax Option
C – Copper
N – CuproNickel
Thermostat Control
1 – Unit Mounted Thermostat
2 – Remote Wall-Mount Thermostat
NOTES: Chassis only available with left piping option.
09-12 only available with PSC blower.
15-18 only available with 3-Speed ECM blower.
4
ASTON LOW SILL SERIES SPECIFICATION CATALOG
AHRI Data
PSC/ECM Motors
AHRI/ASHRAE/ISO 13256-1
English (IP) Units
Water Loop Heat Pump
Flow Rate
Cooling
EWT 86°F
Model
Ground Water Heat Pump
Heating
EWT 68°F
Cooling
EWT 59°F
Ground Loop Heat Pump
Heating
EWT 50°F
Cooling
EWT 77°F
Heating
EWT 32°F
GPM
CFM
Capacity
Btuh
EER
Btuh/W
Capacity
Btuh
COP
Capacity
Btuh
EER
Btuh/W
Capacity
Btuh
COP
Capacity
Btuh
EER
Btuh/W
Capacity
Btuh
COP
09
2.5
300
8,700
12.2
11,400
4.3
10,000
18.6
9,200
3.7
9,500
14.0
7,200
2.9
12
3.5
340
10,900
12.2
14,700
4.3
12,700
17.9
11,800
3.7
11,500
13.5
9,400
2.9
15
4.5
450
13,300
12.2
17,500
4.4
16,200
19.0
14,300
3.8
14,200
14.3
10,600
3.0
18
5.5
500
16,200
12.2
20,500
4.3
19,000
18.5
17,000
3.7
17,000
13.9
12,700
2.8
6/10/13
Cooling capacities based upon 80.6°F DB, 66.2°F WB entering air temperature
Heating capacities based upon 68°F DB, 59°F WB entering air temperature
All ratings based upon 208V operation.
Voltage Availability
Low Sill Console
Voltage
09
12
15
18
115/60/1
•
•
208-230/60/1
•
•
•
•
265/60/1
•
•
•
•
6/10/13
All Affinity Series product is Safety listed under UL1995 thru ETL and performance listed with AHRI in
accordance with standard 13256-1.
5
ASTON LOW SILL SERIES SPECIFICATION CATALOG
AHRI Data cont.
The performance standard AHRI/ASHRAE/ISO 13256-1 became effective January 1, 2000 and replaces ARI Standards 320, 325, and
330. This new standard has three major categories: Water Loop (comparable to ARI 320), Ground Water (ARI 325), and Ground Loop (ARI
330). Although these standards are similar there are some differences:
Unit of Measure: The Cooling COP
The cooling efficiency is measured in EER (US version measured in Btuh per Watt. The Metric version is measured in a cooling COP
(Watt per Watt) similar to the traditional COP measurement.
Water Conditions Differences
Entering water temperatures have changed to reflect the centigrade temperature scale. For instance the water loop heating test is
performed with 68°F (20°C) water rounded down from the old 70°F (21.1°C).
Air Conditions Differences
Entering air temperatures have also changed (rounded down) to reflect the centigrade temperature scale. For instance the cooling
tests are performed with 80.6°F (27°C) dry bulb and 66.2°F (19°C) wet bulb entering air instead of the traditional 80°F (26.7°C) DB
and 67°F (19.4°C) WB entering air temperatures. 80.6/66.2 data may be converted to 80/67 using the entering air correction table.
This represents a significantly lower relative humidity than the old 80/67 of 50% and will result in lower latent capacities.
Pump Power Correction Calculation
Within each model, only one water flow rate is specified for all three groups and pumping Watts are calculated using the following
formula. This additional power is added onto the existing power consumption.
• Pump power correction = (gpm x 0.0631) x (Press Drop x 2990) / 300
Where ‘gpm’ is waterflow in gpm and ‘Press Drop’ is the pressure drop through the unit heat exchanger at rated water flow in feet of
head.
Blower Power Correction Calculation
Blower power is corrected to zero external static pressure using the following equation. The nominal airflow is rated at a specific external static pressure. This effectively reduces the power consumption of the unit and increases cooling capacity but decreases heating
capacity. These Watts are significant enough in most cases to increase EER and COPs fairly dramatically over ARI 320, 325, and 330
ratings.
• Blower Power Correction = (cfm x 0.472) x (esp x 249) / 300
Where ‘cfm’ is airflow in cfm and ‘esp’ is the external static pressure at rated airflow in inches of water gauge.
ISO Capacity and Efficiency Calculations
The following equations illustrate cooling calculations:
• ISO Cooling Capacity = Cooling Capacity (Btuh) + (Blower Power Correction (Watts) x 3.412)
• ISO EER Efficiency (W/W) = ISO Cooling Capacity (Btuh) x 3.412 / [Power Input (Watts) - Blower Power Correction (Watts) + Pump
Power Correction (Watt)]
The following equations illustrate heating calculations:
• ISO Heating Capacity = Heating Capacity (Btuh) - (Blower Power Correction (Watts) x 3.412)
• ISO COP Efficiency (W/W) = ISO Heating Capacity (Btuh) x 3.412 / [Power Input (Watts) - Blower Power Correction (Watts) + Pump
Power Correction (Watt)]
Comparison of Test Conditions
Cooling
Entering Air - DB/WB °F
Entering Water - °F
Fluid Flow Rate
Heating
Entering Air - DB/WB °F
Entering Water - °F
Fluid Flow Rate
ARI 320
ISO/AHRI
13256-1
WLHP
ARI 325
ISO/AHRI
13256-1
GWHP
ARI 330
ISO/AHRI
13256-1 GLHP
80/67
85
*
80.6/66.2
86
**
80/67
50/70
**
80.6/66.2
59
**
80/67
77
**
80.6/66.2
77
**
70
70
*
68
68
**
70
50/70
**
68
50
**
70
32
**
68
32
**
Note *: Flow rate is set by 10°F rise in standard cooling test
Note **: Flow rate is specified by the manufacturer
Part load entering water conditions not shown.
WLHP = Water Loop Heat Pump; GWHP = Ground Water Heat Pump; GLHP = Ground Loop Heat Pump
Conversions:
Airflow (lps) = cfm x 0.472;
ESP (Pascals) = ESP (in wg) x 249;
WaterFlow (lps) = gpm x 0.0631;
Press Drop (Pascals) = Press Drop (ft hd) x 2990
6
ASTON LOW SILL SERIES SPECIFICATION CATALOG
The Aston Series Low Sill Console
Aston Series Low Sill Console Models
GCLC 09-18 (3/4-1.5 tons) Chassis only
GCLW 09-18 (3/4-1.5 tons) Flat top cabinet
GCLS 09-18 (3/4-1.5 tons) Slope top cabinet
GCLX 09-12 (3/4-1.0 tons) Four-sided flat top cabinet
GCLF 09-18 (3/4-1.5 tons) Extended flat top cabinet
Standard Features
Easy Maintenance and Service Advantages
•
•
•
•
•
• Removable compressor access panel
• High and low pressure refrigerant service ports.
• Internal slide out blowers.
Slope and Flat top configurations
Footprint matches “legacy” products for easy retrofits.
Attractive rounded corners heavy gauge cabinet.
Quiet rotary compressors in all models.
2-dimension refrigerant piping vibration loops to isolate
the compressor.
• All interior cabinet surfaces including the compressor
compartment are insulated with 1/2 in. [12.7mm] thick 1-1/2lb
[681g] density, surface coated, acoustic type glass fiber insulation.
Factory Quality
• All refrigerant brazing is performed in a nitrogen
environment.
• Computer controlled deep vacuum and refrigerant charging system.
• All joints are leak detected for maximum leak rate of less than
1/4 oz. per year.
7
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Inside the Aston Series Low Sill Console
Refrigerant
Service Connections and Serviceability
Aston Series models all feature zero ozone depletion and low
global warming potential refrigerant R-410A.
Two Schrader service ports are provided in
every unit. The suction side and discharge
side ports are for field charging and
servicing access. All valves are 7/16 in.
SAE connections. All water and electrical
connections are made from the front of
the unit. Unit is designed for front access
serviceability.
Cabinet
All units are all constructed of corrosion resistant galvanized sheet
metal with polyester powder coat paint rated for more than 1000
hours of salt spray. Refrigerant circuit is designed to allow primary
serviceability from the front. One access panel allows servicing of
the blower motor, blower, and drain pan. Cabinet is designed to
match "industry" foot print for ease of replacement.
4-Way Reversing Valve
Units feature a reliable all-brass pilot operated refrigerant reversing
valve. The reversing valve operation is limited to change of mode
by the control to enhance reliability.
Drain Pan
All condensate connections are welded stainless steel tubes for
economical corrosion free connections. Bacteria resistant stainless
steel drain pan is designed to promote complete drainage and will
never rust or corrode. Complete drainage helps to inhibit bacterial or
microbial growth. Units feature an internally trapped condensate line.
Compressors
High efficiency R-410A rotary compressors are used on every
model. Rotary compressors provide both the highest efficiency
available and great reliability.
Electrical Box
Air Coil
Unit controls feature quick connect wiring harnesses for easy
servicing. Large 50VA transformer assures adequate controls
power for accessories.
Air coils are constructed of lanced fin and riffled tube. Each
model features 3 rows for added moisture removal. An optional
FormiShield™ air coil coating is available to further inhibit
formicary corrosion.
Thermostatic Expansion Valve
All models utilize a balanced port bi-directional
thermostatic expansion valve (TXV) for
refrigerant metering. This allows precise
refrigerant flow in a wide range of entering water
variation (20 to 120°F [-7 to 49 °C]) found in
geothermal systems.
Blower Motor and Housing
High efficiency low rpm galvanized direct drive blowers featuring
2 speed permanently split capacitor (PSC) motor. All PSC motors
have speed selection switch on the control cover for easy speed
change. All motors are vibration isolated to reduce noise.
3-Speed ECM Constant Torque Motors
The 3-speed ECM is a ‘Constant Torque’ ECM motor and delivers air
flow similar to a PSC but operates as efficiently as a variable speed
ECM motor. Because it is an ECM motor, the 3-speed ECM can
ramp slowly up or down like the variable speed ECM motor. There
are 3 possible speed taps available on the 3-speed ECM motor with
#1 being the lowest airflow and #3 being the highest airflow. These
speed selections are preset at the time of manufacture and are easily
changed in the field if necessary.
Water to Refrigerant Coaxial Heat Exchanger Coil
Large oversized coaxial refrigerant to water heat
exchangers provide unparalleled
efficiency. The coaxes are designed for
low pressure drop and low flow rates.
All coaxes are pressure rated to 450 psi
water side and 600 psi on the refrigerant
side. Optional ThermaShield coated waterto-refrigerant coaxial heat exchanger is
available to prevent condensation in low
temperature loop operation.
All-Aluminum Air Coil
These air coils are constructed of lanced fin and rifled tube aluminum
that is not susceptible to formicary corrosion. For additional
condensate runoff and meeting project specifications, an optional
AlumiSeal e-coating is available.
8
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Controls
Control
General Description
Application
Display/Interface
CCM Control
The CCM (Compressor control module)
is a more reliable replacement for
electro-mechanical control applications.
It features a small microprocessor
board that handles the lockout function
of the unit. A second microporcessor
handles the unit mounted thermostat for
maintaining accurate room temperature.
Residential and commercial
applications requiring minimal but
reliable controls. Includes Random
Start, High and low pressure switches
and auto changeover capability.
Dial thermostat with Hi and
Low blower speeds, and
auto changeover or cont
blower selection switches.
Protocol
None
Thermostat Options
Unit Mounted Digital
Dial Thermostat
Remote Mounted
Standard Thermostat
Standard CCM Control Features
If either the low or high pressure safety switches are opened, the
compressor and reversing valve are disabled by the lockout relay.
Unit operation will resume only after the voltage to the unit is
interrupted or the mode switch is placed in the “Off” position.
Compressor control module (CCM) controls are standard on the
Aston Series Low Sill Console heat pump. This control features unit
mounted thermostat and switches,
Features of the standard control are:
• Easy to understand color coded thermostat adjustment markings.
• Large, rocker type mode and blower switches.
• Internally mounted blower switch to choose cycled or constant
blower operation.
• High pressure and low pressure safety controls to protect the
unit components.
• Lockout circuit to shut down unit operation upon receipt of a fault
indicator from the safety controls.
• A 24 volt control circuit allows for safe and easy diagnosis.
The user selects either “Heat/Cool” or “Fan Only” on the mode
switch, then either “High” or “Low” at the blower speed switch. The
temperature can be controlled by rotating the thermostat control knob.
Unit Mounted Control
The “Fan Only” setting provides constant blower operation.
In the “Heat” mode, a call for heat by the thermostat closes the
compressor contactor contacts, energizing the compressor, which
will run until the thermostat is satisfied.
In the “Cool” mode, a call for cooling by the
thermostat energizes the reversing valve and closes the
compressor contactor contacts, energizing the compressor, which
will run until the thermostat is satisfied.
9
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Controls cont.
Aurora ‘Base’ Control
Field Selectable Options via Hardware
DIP Switch (SW1) – Test/Configuration Button (See SW1
Operation Table)
Test Mode
The control is placed in the test mode by holding the push
button switch SW1 for 2 - 5 seconds. In test mode most of
the control timings will be shortened by a factor of sixteen
(16). LED3 (green) will flash at 1 second on and 1 second
off. Additionally, when entering test mode LED1 (red) will
flash the last lockout one time. Test mode will automatically
time out after 30 minutes. Test mode can be exited by
pressing and holding the SW1 button for 2 to 5 seconds or
by cycling the power. NOTE: Test mode will automatically
be exited after 30 minutes.
NOTE: Refer to the Aurora Base Control Application and
Troubleshooting Guide and the Instruction Guide: Aurora
Interface and Diagnostics (AID) Tool for additional information.
Control Features
Software ABC Standard Version 3.0
Single or Dual Capacity Compressors
Variable Speed ECM Configuration Mode
(If Applicable)
Either single or dual capacity compressors can be operated.
The control is placed in the ECM configuration mode by
holding the pushbutton switch SW1 for 5 to 10 seconds, the
high, low, and “G” ECM speeds can be selected by following
the LED display lights. LED2 (yellow) will fast flash when
entering the ECM configuration. When setting “G” speed
LED3 (green) will be continuously lit, for low speed LED1
(red) will be continuously lit, and for high speed both LED3
(green) and LED1 (red) will be continuously lit. During the
ECM configuration mode LED2 (yellow) will flash each of
the 12 possible blower speeds 3 times. When the desired
speed is flashed press SW1, LED2 will fast flash until SW1
is released. “G” speed has now been selected. Next select
low speed, and high speed blower selections following the
same process above. After third selection has been made,
the control will exit the ECM configuration mode. Aux fan
speed will remain at default or current setting and requires
the AID Tool for adjustment.
Variable Speed ECM
Blower Motor Option (If Applicable)
A Variable Speed ECM blower motor can be driven directly
using the onboard PWM output. Four blower speeds are
available based upon the G, Y1, Y2, and W input signals to
the board. The blower speeds can be changed either by the
ECM manual configurations mode method or by using the
Aurora AID Tool directly. All four blower speeds can be set
to the same speed if desired.
5-Speed ECM Blower Motor Option (If Applicable)
A 5-Speed ECM blower motor will be driven directly using
the thermostat connections. Any of the G, Y1, or Y2/W
signals can drive any of the 5 available pre-programmed
blower speeds on the motor. All 5 Series "G" vintage units
will be wired this way at the factory.
Reset Configuration Mode
The control is placed in reset configuration mode by
holding the push button switch SW1 for 50 to 60 seconds.
This will reset all configuration settings and the EEPROM
back to the factory default settings. LED3 (green) will turn
off when entering reset configuration mode. Once LED3
(green) turns off, release SW1 and the control will reset.
Other Control Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Random start at power up
Anti-short cycle protection
High and low pressure cutouts
Loss of charge
Water coil freeze detection
Air coil freeze detection
Over/under voltage protection
Condensate overflow sensor
Load shed
Dehumidification (where applicable)
Emergency shutdown
Hot gas reheat operation (where applicable)
Diagnostic LED
Test mode push button switch
Two auxiliary electric heat outputs
Alarm output
Accessory output with N.O. and N.C.
Modbus communication (master)
Modbus communication (slave)
DIP Switch (SW2)
SW2-1
FP1 Selection – Low water coil temperature limit
setting for freeze detection. On = 30°F; Off = 15°F.
SW2-2 FP2 Selection – On = 30°F; Off = N/A
SW2-3 RV – O/B - thermostat type. Heat pump
thermostats with “O” output in cooling or “B”
output in Heating can be selected. On = O; Off = B.
SW2-4 Access Relay Operation (P2)
and 2-5
Access Relay Operation
Cycle with Blower
Cycle with Compressor
Water Valve Slow Opening
Cycle with Comm. T-stat Hum Cmd
10
SW2-4
ON
OFF
ON
OFF
SW2-5
ON
OFF
OFF
ON
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Controls cont.
Cycle with Blower - The accessory relay will cycle with
the blower output.
Lockout – when locked out, the blower will operate
continuously in “G” speed, and PSC blower motor output
will remain on. The Alarm output (ALM) and Lockout output
(L) will be turned on. The fault type identification display
LED1 (Red) shall flash the fault code. To reset lockout
conditions with SW2-8 On, thermostat inputs “Y1”, “Y2”,
and “W” must be removed for at least 3 seconds. To reset
lockout conditions with SW2-8 Off, thermostat inputs “Y1”,
“Y2”, “W”, and “DH” must be removed for at least 3 seconds.
Lockout may also be reset by turning power off for at least
30 seconds or by enabling the emergency shutdown input
for at least 3 seconds.
Cycle with Compressor - The accessory relay will cycle
with the compressor output.
Water Valve Slow Opening - The accessory relay will
cycle and delay both the blower and compressor output
for 90 seconds.
SW2-6 CC Operation – selection of single or dual capacity
compressor. On = Single Stage; Off = Dual Capacity
SW2-7 Lockout and Alarm Outputs (P2) – selection of a
continuous or pulsed output for both the LO and
ALM Outputs. On = Continuous; Off = Pulsed
SW2-8 Future Use
Lockout With Emergency Heat - if the control is locked out
in the heating mode, and a Y2 or W input is received, the
control will operate in the emergency heat mode while the
compressor is locked out. The first emergency heat output will
be energized 10 seconds after the W input is received, and the
blower will shift to high speed. If the control remains locked
out, and the W input is present, additional stage of emergency
heat will stage on after 2 minutes. When the W input is
removed, all of the emergency heat outputs will turn off, and
the ECM blower will shift to “G” speed and PSC blower motor
output will remain on.
Alarm Jumper Clip Selection
From the factory, ALM is connected to 24 VAC via JW2. By
cutting JW2, ALM becomes a dry contact connected to ALG.
Variable Speed ECM Blower Speeds
The blower speeds can be changed either by using the
ECM manual configurations mode method or by using the
Aurora AID Tool directly (see Instruction Guide: Aurora
Interface and Diagnostics (AID) Tool topic).
High Pressure – fault is recognized when the Normally
Closed High Pressure Switch, P4-9/10 opens, no matter
how momentarily. The High Pressure Switch is electrically in
series with the Compressor Contactor and serves as a hardwired limit switch if an overpressure condition should occur.
Field Selectable Options via Software
(Selectable via the Aurora AID Tool)
ECM Blower Speeds
Low Pressure - fault is recognized when the Normally
Closed Low Pressure Switch, P4-7/8 is continuously open
for 30 seconds. Closure of the LPS any time during the 30
second recognition time restarts the 30 second continuous
open requirement. A continuously open LPS shall not be
recognized during the 2 minute startup bypass time.
An ECM blower motor can be driven directly using the
onboard PWM output. Four blower speeds are available,
based upon the “G”, Y1 (low), Y2 (high), and Aux input
signals to the board. The blower speeds can be changed
either by the ECM manual configurations mode method (see
ECM Configuration Mode topic) or by using the Aurora AID
Tool directly. All four blower speeds can be set to the same
speed if desired. Aux blower speed will remain at default or
current setting and requires the AID Tool for adjustment.
Loss of Charge – fault is recognized when the Normally
Closed Low Pressure Switch, P4-7/8 is open prior to the
compressor starting.
Condensate Overflow - fault is recognized when the
impedance between this line and 24 VAC common or chassis
ground drops below 100K ohms for 30 seconds continuously.
Safety Features
The following safety features are provided to protect the
compressor, heat exchangers, wiring and other components
from damage caused by operation outside of design conditions.
Freeze Detection (Coax) - set points shall be either 30°F
or 15°F. When the thermistor temperature drops below
the selected set point, the control shall begin counting
down the 30 seconds delay. If the thermistor value rises
above the selected set point, then the count should reset.
The resistance value must remain below the selected set
point for the entire length of the appropriate delay to be
recognized as a fault. This fault will be ignored for the initial
2 minutes of the compressor run time.
Fuse – a 3 amp automotive type plug-in fuse provides
protection against short circuit or overload conditions.
Anti-Short Cycle Protection – 4 minute anti-short cycle
protection for the compressor.
Random Start – 5 to 80 second random start upon power up.
Fault Retry – in the fault condition, the control will stage off
the outputs and then “try again” to satisfy the thermostat
Y input call. Once the thermostat input calls are satisfied,
the control will continue on as if no fault occurred. If 3
consecutive faults occur without satisfying the thermostat
Y input call, then the control will go to Lockout mode.
Freeze Detection (Air Coil) - uses the FP2 input to protect
against ice formation on the air coil. The FP2 input will
operate exactly like FP1 except that the set point is 30
degrees and is not field adjustable.
11
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Controls 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 selfresetting 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.
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.
Single Compressor Cooling, 2nd Stage (Y1, Y2, 0)
The compressor will be staged to full capacity 20 seconds
after Y2 input was received. The ECM blower will shift to high
speed 15 seconds after the Y2 input was received.
Operation Description
Dual Compressor Cooling, 2nd Stage (Y1, Y2, O)
In dual compressor operation, two ABC boards used in 24
VAC operation, there will be a Y2 call to the Y1 input on the
second ABC. The compressor will stage to full capacity 30
seconds after Y1 input is received to the second board.
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.
Blower (G) - The blower will start immediately upon
receiving a thermostat G command. If there are no other
commands from the thermostat the ECM will run on “G”
speed until the G command is removed. Regardless of
blower input (G) from the thermostat, the blower will
remain on for 30 seconds at the end of each heating,
cooling, and emergency heat cycle.
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
Single Compressor Heating, 2nd Stage (Y1, Y2)
The compressor will be staged to full capacity 20 seconds
after Y2 input is received. The ECM blower will shift to high
speed seconds after the Y2 input is received.
Dehumidification (Y1, O, DH or Y1, Y2, O, DH) - When a
DH command is received from the thermostat during a
compressor call for cooling the ECM blower speed will be
reduced by 15% to increase dehumidification.
Dual Compressor Heating, 2nd Stage (Y1, Y2)
In dual compressor operation, two ABC boards used in 24
VAC operation, there will be a Y2 call to the Y1 input on the
second ABC. The compressor will stage to full capacity 30
seconds after Y1 input is received to the second board.
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.
Single Compressor Heating, 3rd Stage (Y1, Y2, W)
The hot water pump is de-energized and 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.
Continuous Blower Operation - The blower output will
be energized any time the control has a G input present,
unless the control has an emergency shutdown input
present. The blower output will be turned off when G input
is removed.
Dual Compressor Heating, 3rd Stage (Y1, Y2, W) 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
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.
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.
Blower (G) - The blower will start immediately upon
receiving a thermostat G command. If there are no other
commands from the thermostat the ECM will run on “G”
speed until the G command is removed. Regardless of
blower input (G) from the thermostat, the blower will
remain on for 30 seconds at the end of each heating cycle.
12
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Controls cont.
Aurora ‘Base’ Control LED Displays
Aurora Interface and Diagnostics (AID) Tool
These three LEDs display the status, configuration, and
fault codes for the control. These can also be read in plain
English via the Aurora AID Tool.
The Aurora Interface and
Diagnostics (AID) Tool is
a device that is a member
of the Aurora network.
The AID Tool is used to
troubleshoot equipment
which uses the Aurora
control via Modbus RTU
communication. The AID
Tool provides diagnostics,
fault management, ECM
setup, and system configuration capabilities to the Aurora
family of controls. An AID Tool is recommended, although
not required, for ECM airflow settings. The AID Tool simply
plugs into the exterior of the cabinet in the AID Tool port.
Status LED (LED3, Green)
Description of Operation
Normal Mode
Control is Non-functional
Test Mode
Lockout Active
Dehumidification Mode
(Future Use)
(Future Use)
Load Shed
ESD
(Future Use)
Fault LED, Green
ON
OFF
Slow Flash
Fast Flash
Flash Code 2
Flash Code 3
Flash Code 4
Flash Code 5
Flash Code 6
Flash Code 7
ABC Control Board Layout
FP2 – 15 F/30 F
2
RV – B/O
3
ACC – Dip 4
4
ACC – Dip 5
5
CC – Dual/Single
6
LED3
G
L – Pulse/Continuous
7
Reheat/Normal
8
Status
G
Factory Use
Com1
Fan – K4
Com2
P9
C
C
Y2
C
3A-Fuse
W
DH
DH
Y2
W
G
Y1
Y1
G
O/B
C
R
LO
O/B
C
Field Connections
P1
ACC nc
ACC c
ACC no
LS
ALG
Field Connections
P2
ES
13
Factory Fan Connection
R
LO
Y1
JW2 Alarm
G
Acc – K6
G
(+)
(-)
R
C
P8
P11
Alarm – K5
F
CC
EH2
C
EH1
C
CO
N/A
P7
CC Hi – K3
Factory
CC2
P3
AURORA BASE
CONTROL™
CC – K2
ABC Basic Faults
Config
P6
CC2
P5
EH1
Y
SW2
RV – K1
G
LO
HI
CCG
CC
FG
F
R
LED2
Factory
C
1
R
o
o
Faul t
SW1 Test
On
FP1 – 15oF/30oF
RS485 Exp
LED Flash
Reset/
Lockout
Code*
Remove
Normal - No Faults
OFF
–
Fault - Input
1
No
Auto
Fault - High Pressure
2
Yes
Hard or Soft
Fault - Low Pressure
3
Yes
Hard or Soft
Fault - Freeze Detection FP2
4
Yes
Hard or Soft
Fault - Freeze Detection FP1
5
Yes
Hard or Soft
Fault - Condensate Overflow
7
Yes
Hard or Soft
Fault - Over/Under Voltage
8
No
Auto
Fault - FP1 & FP2 Sensor Error
11
Yes
Hard or Soft
NOTE: All codes >11 use long flash for tens digit and short flash for the ones
digit. 20, 30, 40, 50, etc. are skipped.
Red Fault LED
P13
Off
LED1
ECM PWM
RS 485
Fault LED (LED1, Red)
P4
RS485 NET
HP
HP
LP
LP
FP2
FP2
FP1
FP1
REV
REV
Factory
Configuration LED, Yellow
Flashing ECM Setting
Slow Flash
Fast Flash
ALM
Description of Operation
No Software Overwritten
DIP Switch was Overwritten
ECM Configuration Mode
PWM
CFM
Configuration LED (LED2, Yellow)
R
R
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Controls cont.
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. LED1 (red LED) will flash code 15 when the
DHW limit is reached and when conditions are not favorable
for water heating. Error code 15 will also be displayed on the
AID Tool in the fault screen. This flash code is a noncritical
alert and does not necessarily indicate a problem.
Aurora ‘Advanced’ Control Features
The Aurora ‘Advanced’
Control system expands on
the capability of the Aurora
‘Base’ Control (ABC)
by adding the Aurora
Expansion Board (AXB).
All of the preceding
features of the Aurora
‘Base’ Control are included.
The following control
description is of the
additional features and
capability of the Aurora
advanced control.
Compressor Monitoring
The AXB includes two current transducers to monitor the
compressor current and starting characteristics. Open
circuits or welded contactor faults will be detected. A fault
will produce an E10 code.
It is highly recommended the
installing/servicing contractor obtain
an Aurora Interface and Diagnostic
Tool (AID) and specialized training
before attempting to install or service
an Aurora ‘Advanced’ control system.
IntelliZone2 Zoning Compatibility
(Optional IntelliZone2 Zoning)
A dedicated input to connect and communicate with the
IntelliZone2 (IZ2) zoning system is provided on P7. The is a
dedicated communication port using a proprietary ModBus
protocol. 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.
The additional AXB features include the following:
AXB DIP Switch
DIP 1 - ID: This is the AXB ModBus ID and should always
read On.
DIP 2 & 3 - Future Use
DIP 4 & 5 - Accessory Relay2: A second, DIP configurable,
accessory relay is provided that can be cycled with the
compressor 1 or 2 , blower, or the Dehumidifier (DH)
input. This is to complement the Accessory 1 Relay on
the ABC board.
Position
1
DIP 4
ON
DIP 5
ON
2
OFF
ON
3
ON
OFF
4
OFF
OFF
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. 75% 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.
Description
Cycles with Fan or ECM (or G)
Cycles with CC1 first stage of compressor
or compressor spd 6
Cycles with CC2 second stage of
compressor or compressor spd 7-12
Cycles with DH input from ABC board
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. 75% and 100% are the default
settings respectively.
Advanced Hot Water Generator Control
(Domestic Hot Water Option)
In lieu of the ‘Base Hot Water Generator Control’, the
Advanced features an AID Tool selectable temperature limit
and microprocessor control of the process. This will maximize
hot water generation and prevent undesirable energy use. An
alert will occur when the hot water input temperature is at
or above setpoint (100°F - 140°F) for 30 continuous seconds
(130°F is the default setting). This alert will appear as an E15
on the AID Tool and the hot water pump de-energizes. Hot
water pump operations resume on the next compressor cycle
or after 15 minutes of continuous compressor operation during
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 pump, 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 be wired and linked together in this fashion.
14
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Controls cont.
Home Automation 2 – E24 HA2
With a closed dry contact signal, this input will cause an
alarm and Alert Code 24 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
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 '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. With a closed contact signal, this input will
limit the operation and thus the power consumption of the
unit by one of the below selections. The AID Tool will allow
configuration of this input for the action of:
• No Action
• Disable compressor operation until removed
• Go to On Peak thermostat settings until removed
[Requires Com T-Stat] (Future Release)
• Compressor limited to 50% or low cap until removed
[dual capacity or variable speed only] (Future Release)
• Disable compressor operation for 1/2 hr (can be
removed immediately) (Future Release)
Monitoring Sensor Kits
Energy Monitoring
(Standard Sensor Kit on ‘Advanced’ models)
The Energy Monitoring Kit includes two current transducers
(blower and electric heat) added to the existing two
compressor sensors so that the complete power usage of
the heat pump can be measured. The AID Tool provides
configuration detail for the type of blower motor and a
line voltage calibration procedure to improve the accuracy.
This information can be displayed on the AID Tool or
selected communicating thermostats. The TPCM32U03/04
will display instantaneous energy use while the color
touchscreen TPCC32U01 will in addition display a 13 month
history in graph form.
Then Flash Code 7 on the Green LED for the 'On Peak' mode.
And On Peak will 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.
Refrigerant Monitoring (optional sensor kit)
The optional Refrigerant Monitoring Kit includes two
pressure transducers, and three temperature sensors,
heating liquid line, suction temperature and existing cooling
liquid line (FP1). These sensors allow the measurement
of discharge and suction pressures, suction and liquid line
temperatures as well as superheat and subcooling. This
information will only be displayed on the AID Tool.
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
Performance Monitoring (optional sensor kit)
The optional Performance Monitoring Kit includes three
temperature sensors, entering and leaving water, leaving
air temperature and a water flow rate sensor. With this kit
heat of extraction and rejection will be calculated. This
requires configuration using the AID Tool for selection of
water or antifreeze.
15
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Controls cont.
Special Modes and Applications
Aurora ‘Advanced’ Control LED Displays
5-Speed ECM Blower Motor
These three LEDs display the status, configuration, and
fault codes for the control. These can also be read in plain
English via the Aurora AID Tool.
Normally the 5-Speed ECM motor can be driven off
of thermostat signals and the ABC connector P9.
Communicating thermostats, however present a special
problem in this application since they operate without 24
VAC thermostat signals. The ABC board is wired to operate
these systems from the alternate relay output signals CC1,
CC2, Fan, and EH1 and should be wired for this.
Status LED (LED3, Green)
Description of Operation
Normal Mode
Control is Non-functional
Test Mode
Lockout Active
Dehumidification Mode
Load Shed
Emergency Shutdown
On Peak Mode
(Future Use)
(Future Use)
Communicating Digital Thermostats
The Aurora controls system also features either monochromatic or color touch screen graphic display
thermostats for user interface. These displays not only
feature easy to use graphical interface but display alerts
and faults in plain English. Many of the features discussed
here may not be applicable without these thermostats.
Fault LED, Green
ON
OFF
Slow Flash
Fast Flash
Flash Code 2
Flash Code 5
Flash Code 6
Flash Code 7
Flash Code 8
Flach Code 9
Configuration LED (LED2, Yellow)
Description of Operation
No Software Overwritten
DIP Switch Overwritten
ECM Configuration Mode
Reset Configuration Mode
Dehumidification – Passive
In passive dehumidification mode, the airflow is reduced
by 15% from the heating airflow setting. If cooling airflow is
set to +5, -5 or -10% of heating airflow it will automatically
be set to -15% of heating airflow whenever the
dehumidification call is present in the communicating stat
or from the thermostat input DH. If the airflow for cooling is
already set to -15% no airflow change will be noticed from
normal cooling. Dehumidification mode will be shown on
the ABC and the communicating thermostats.
Configuration LED, Yellow
ECM Setting
Slow Flash
Fast Flash
OFF
Fault LED (LED1, Red)
ABC & AXB Advanced Faults
ABC Basic Faults
Red Fault LED
Normal - No Faults
Fault-Input
Fault-High Pressure
Fault-Low Pressure
Fault-Freeze Detection FP2
Fault-Freeze Detection FP1
Fault-Condensate Overflow
Fault-Over/Under Voltage
Fault-FP1 & 2 Snsr Error
LED Flash
Lockout
Code *
Off
1
No
2
Yes
3
Yes
4
Yes
5
Yes
7
Yes
8
No
11
Yes
Reset/
Remove
Fault Condition Summary
Auto
Hard or Soft
Hard or Soft
Hard or Soft
Hard or Soft
Hard or Soft
Auto
Hard or Soft
Tstat input error. Autoreset upon condition removal.
HP switch has tripped (>600 psi)
Low Pressure Switch has tripped (<40 psi for 30 continuous sec.)
Freeze protection sensor has tripped (<15 or 30 degF for 30 continuous sec.)
Freeze protection sensor has tripped (<15 or 30 degF for 30 continuous sec.)
Condensate switch has shown continuity for 30 continuous sec.
Instantaneous voltage is out of range. **Controls shut down until resolved.
If FP1 or 2 Sensor Error
Open Crkt, Run, Start or welded cont
Fault-Compressor Monitor
10
Yes
Hard or Soft
Non-CriticAXBSnsrErr
13
No
Auto
CriticAXBSnsrErr
14
Yes
Hard or Soft
Any Other Sensor Error
Sensor Error for EEV or HW
Alert-HotWtr
15
No
Auto
HW over limit or logic lockout. HW pump deactivated.
Fault-VarSpdPump
16
No
Auto
Alert is read from PWM feedback.
Not Used
17
No
Auto
IZ2 Com Fault. Autoreset upon condition removal.
Non-CritComErr
18
No
Auto
Any non-critical com error
Fault-CritComErr
19
No
Auto
Any critical com error. Auto reset upon condition removal
Alarm - Low Loop Pressure
21
No
Auto
Loop pressure is below 3 psi for more than 3 minutes
Alarm - Home Automation 1
23
No
Auto
Closed contact input is present on Dig 2 input - Text is configurable
Alarm - Home Automation 2
24
No
Auto
Closed contact input is present on Dig 3 input - Text is configurable
NOTES:
*All codes >11 use long flash for tens digit and short flash for the ones digit. 20, 30, 40, 50 etc. are skipped!
Alert’ is a noncritical sensor or function that has failed. Normal operation of the heat pump is maintained but service is desired at some point.
16
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Application Notes
comfortable since each unit operates separately, allowing cooling
in one area and heating in another. Tenant spaces can be
finished and added as needed. Power billing to tenants is also
convenient since each unit can be individually metered: each pays
for what each uses. Nighttime and/or weekend uses of certain
areas are possible without heating or cooling the entire facility.
A decentralized system also means if one unit should fault, the
rest of the system will continue to operate normally, as well as
eliminating air cross-contamination problems and expensive high
pressure duct systems requiring an inefficient electric resistance
reheat mode.
The Closed Loop Heat Pump Concept
The basic principle of a water source heat pump is the transfer
of heat into water from the space during cooling, or the transfer
of heat from water into the space during heating. Extremely high
levels of energy efficiency are achieved as electricity is used only
to move heat, not to produce it. Using a typical Aston Series, one
unit of electricity will move four to five units of heat.
When multiple water source heat pumps are combined on a
common circulating loop, the ultimate in energy efficiency is
created: Units on cooling mode are adding heat to the loop which
the units in heating mode can absorb, thus removing heat from the
area where cooling is needed, recovering and redistributing that
heat for possible utilization elsewhere in the system. In modern
commercial structures, this characteristic of heat recovery from
core area heat generated by lighting, office equipment, computers,
solar radiation, people or other sources, is an important factor in
the high efficiency and low operating costs of closed source heat
pump systems.
The Aston Series Approach
There are a number of proven choices in the type of Aston Series
system which would be best for any given application. Most often
considered are:
Vertical - Closed Loop/Ground Source
Return Water
Heater/
Rejector
GeoStar
Unit
GeoStar
Unit
GeoStar
Unit
GeoStar
Unit
GeoStar
Unit
GeoStar
Unit
Pumps
Supply Water
In the event that a building's net heating and cooling requirements
create loop temperature extremes, Aston Series units have the
extended range capacity and versatility to maintain a comfortable
environment for all building areas. Excess heat can be stored
for later utilization or be added or removed in one of three ways;
by ground-source heat exchanger loops: plate heat exchangers
connected to other water sources, or conventional cooler/
boiler configurations. Your representative has the expertise and
computer software to assist in determining optimum system type
for specific applications.
• Closed Loop/Ground-Source Systems utilize the stable
temperatures of the earth to maintain proper water source
temperatures (via vertical or horizontal closed loop heat
exchangers) for Aston Series extended range heat pump
system. Sizes range from a single unit through many hundreds
of units. When net cooling requirements cause closed loop water
temperatures to rise, heat is dissipated into the cooler earth
through buried high strength plastic pipe “heat exchangers.”
Conversely if net space heating demands cause loop heat
absorption beyond that heat recovered from building core areas,
the loop temperature will fall causing heat to be extracted from the
earth. Due to the extended loop temperatures, AHRI/ISO 13256-1
Ground Loop Heat Pumps are required for this application.
Because auxiliary equipment such as a fossil fuel boiler and
The Closed Loop Advantage
A properly applied water source heat pump system offers many
advantages over other systems. First costs are low because
units can be added to the loop on an “as needed basis”- perfect
for speculative buildings. Installed costs are low since units are
self-contained and can be located adjacent to the occupied
space, requiring minimal ductwork. Maintenance can be done
on individual units without system shut-down. Conditions remain
17
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Application Notes cont.
Plate Heat Exchanger - Closed Loop/Ground Water
cooling tower are not required to maintain the loop temperature,
operating and maintenance costs are very low.
Ground-source systems are most applicable in residential and
light commercial buildings where both heating and cooling are
desired, and on larger envelope dominated structures where core
heat recovery will not meet overall heating loads. Both vertical
and horizontally installed closed-loops can be used. The land
space required for the “heat exchangers” is 100-250 sq. ft./ton on
vertical (drilled) installations and 750-1500 sq. ft./ton for horizontal
(trenched) installations. Closed loop heat exchangers can be
located under parking areas or even under the building itself.
On large multi-unit systems, sizing the closed loop heat exchanger
to meet only the net heating loads and assisting cooling loads with a
closed circuit cooling tower may be the most cost effective choice.
Surface Water - Closed Loop/Ground Source
• Closed Loop/Ground Water Plate Heat Exchanger
Systems utilize lake, ocean, well water or other water sources to
maintain closed loop water temperatures in multi-unit Aston Series
systems. A plate frame heat exchanger isolates the units from any
contaminating effects of the water source, and allows periodic
cleaning of the heat exchanger during off peak hours.
Operation and benefits are similar to those for ground-source
systems. Due to the extended loop temperatures, AHRI/ISO
13256-1 Ground Loop Heat Pumps are required for this application.
Closed loop plate heat exchanger systems are applicable in
commercial, marine, or industrial structures where the many
benefits of a water source heat pump system are desired,
regardless of whether the load is heating or cooling dominated.
• Closed Loop/Ground-Source Surface Water Systems also
utilize the stable temperatures of Surface Water to maintain proper
water source temperatures for Aston Series extended range heat
pump systems. These systems have all of the advantages of
horizontal and vertical closed loop systems. Due to the extended
loop temperatures, AHRI/ISO 13256-1 Ground Water or Ground
Loop Heat Pumps are required for this application.
In cooling dominated structures, the ground-source surface water
systems can be very cost effective especially where local building
codes require water retention ponds for short term storage of
surface run-off. Sizing requirements for the surface water is a
minimum of 500 sq. ft./ton of surface area at a minimum depth of
8 feet. The manufacturer should be contacted when designs for
heating dominated structures are required.
18
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Application Notes cont.
• Closed Loop /Cooler-Boiler Systems utilize a closed heat
recovering loop with multiple water source heat pumps in the more
conventional manner. Typically a boiler is employed to maintain
closed loop temperatures above 60°F and a cooling tower to
maintain loop temperatures below 90°F. These systems are
applicable in medium to large buildings regardless of whether the
load is heating or cooling dominated. Due to the moderate loop
temperatures, AHRI/ISO 13256-1 Water Loop Heat Pumps are
required for this application.
Cooler/Boiler - Closed Loop
Water Quality
In ground water situations where scaling could be heavy or where
biological growth such as iron bacteria will be present, a closed
loop system is recommended. The heat exchanger coils in ground
water systems may, over a period of time, lose heat exchange
capabilities due to a buildup of mineral deposits inside. These
can be cleaned, but only by a qualified service mechanic, as
special solutions and pumping equipment are required. Hot water
generator coils can likewise become scaled and possibly plugged.
Material
pH
Scaling
Acidity/Alkalinity
Calcium and
Magnesium Carbonate
Hydrogen Sulfide
Corrosion
Iron Fouling
(Biological Growth)
Sulfates
Chlorine
Chlorides
Carbon Dioxide
Ammonia
Ammonia Chloride
Ammonia Nitrate
Ammonia Hydroxide
Ammonia Sulfate
Total Dissolved Solids (TDS)
LSI Index
Iron, FE2+ (Ferrous)
Bacterial Iron Potential
Iron Oxide
Suspended Solids
Erosion
Threshold Velocity
(Fresh Water)
NOTES: Grains = ppm divided by 17
mg/L is equivalent to ppm
In areas with extremely hard water, the owner should be informed
that the heat exchanger may require occasional flushing.
Units with cupronickel heat exchangers are recommended for
open loop applications due to the increased resistance to build-up
and corrosion, along with reduced wear caused by acid cleaning.
Failure to adhere to the guidelines in the water quality table could
result in the loss of warranty.
Copper
7-9
(Total Hardness)
less than 350 ppm
Less than 0.5 ppm (rotten egg
smell appears at 0.5 ppm)
Less than 125 ppm
Less than 0.5 ppm
Less than 20 ppm
Less than 50 ppm
Less than 2 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 1000 ppm
+0.5 to -0.5
90/10 Cupronickel
7-9
(Total Hardness)
less than 350 ppm
316 Stainless Steel
7-9
(Total Hardness)
less than 350 ppm
10 - 50 ppm
Less than 1 ppm
Less than 125 ppm
Less than 0.5 ppm
Less than 125 ppm
10 - 50 ppm
Less than 2 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
1000 - 1500 ppm
+0.5 to -0.5
Less than 200 ppm
Less than 0.5 ppm
Less than 300 ppm
10 - 50 ppm
Less than 20 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
1000 - 1500 ppm
+0.5 to -0.5
< 0.2 ppm
< 0.2 ppm
< 0.2 ppm
Less than 1 ppm, above this level
deposition will occur
Less than 10 ppm and filtered for
max. of 600 micron size
Less than 1 ppm, above this level
deposition will occur
Less than 10 ppm and filtered for
max. of 600 micron size
Less than 1 ppm, above this level
deposition will occur
Less than 10 ppm and filtered for
max. of 600 micron size
< 6 ft/sec
< 6 ft/sec
< 6 ft/sec
2/22/12
19
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Installation Notes
Typical Unit Installation
Water Piping
Unit Location
Piping is usually design as ‘reverse return’ to equalize flow paths
through each unit. A short flexible pressure rated hose is used to
make connection to the fixed building piping system. This hose
is typically stainless steel braid and includes a swivel fitting on
one end for easy removal and is flexible to help isolate the unit
for quieter operation. Isolation valves for servicing, y-strainers for
filtering, and memory-stop flow valve or a balancing valve can be
provided for consistent water flow through the unit.
Locate the unit in an indoor area that allows for easy removal of
the filter and access panels. Location should have enough space
for service personnel to perform maintenance or repair. Provide
sufficient room to make water and electrical connection(s). Any
access panel screws that would be difficult to remove after the unit
is installed should be removed prior to setting the unit. Care should
be taken when units are located in unconditioned spaces to
prevent damage from frozen water lines and excessive heat
that could damage electrical components.
All unit source water connections are fittings that accept a male
pipe thread (MPT). Insert the connectors by hand, then tighten
the fitting with a wrench to provide a leakproof joint. The open and
closed loop piping system should include pressure/temperature
ports for serviceability. The proper water flow must be provided
to each unit whenever the unit operates. To assure proper flow,
use pressure/temperature ports to determine the flow rate. These
ports should be located at the supply and return water connections
on the unit. The proper flow rate cannot be accurately set without
measuring the water pressure drop through the refrigerant-to-water
heat exchanger. Check carefully for water leaks.
Installing Console Units
Console units are available in left or right air return configurations.
Units should be mounted level on the floor. It is not necessary to
anchor the unit to the floor.
WARNING: Before performing service or maintenance
operations on a system, turn off main power switches to the
indoor unit. If applicable, turn off the accessory heater power
switch. Electrical shock could cause personal injury.
Condensate Drain
Installing and servicing heating and air conditioning equipment can
be hazardous due to system pressure and electrical components.
Only trained and qualified service personnel should install, repair
or service heating and air conditioning equipment. Untrained
personnel can perform the basic maintenance functions of cleaning
coils and cleaning and replacing filters.
On console units, the internal condensate drain assembly consists
of a drain tube which is connected to the drain pan. A condensate
tube is inside all cabinets as a trapping loop; therefore, an external
trap is not necessary.
All other operations should be performed by trained service
personnel. When working on heating and air conditioning
equipment, observe precautions in the literature, tags and labels
attached to the unit and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use a quenching cloth for brazing operations and have a fire
extinguisher available.
Wall Mount for Chassis
w/Flat Top Cabinets
19.0
Centered
w/ Cabinet
Low Sill
Chassis
Water Out
P/T Plugs (Optional)
Fused Electrical
Disconnect (Optional)
Wall Penetration
for Water Connection
Floor Penetration for
Water Connection
Water In
Ball Valves
(Optional)
Optional Hoses
Condensate
Drain Location
20
Low Sill Flat
Top Cabinet
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Dimensional Data - Flat Top Cabinet
GCLW09-18
Left Hand Cabinet
Right Hand Cabinet
TOP
F
D
E
B
A
G
C
FRONT
SIDE
Right return cabinet shown in dimensional views
Overall Cabinet
A
B
C
D
E
F
Width
Depth
Height
Grille
Lid
Grille
Length
Grille
Width
in.
45.1
10.8
22.5
9.2
35.0
6.1
cm.
114.6
27.4
57.2
23.4
88.9
15.6
5.8
in.
50.0
12.8
22.5
9.2
35.0
6.1
3.3
cm.
127.0
32.4
57.2
23.4
88.9
15.6
8.3
Flat Top
Configuration
09-12
15-18
Grille
21
G
2.3
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Dimensional Data - Slope Top Cabinet
GCLS09-18
Right Hand Cabinet
Left Hand Cabinet
TOP
F
D
80°
E
B
A
G
C
H
SIDE
FRONT
Right return cabinet shown in dimensional views
Overall Cabinet
A
B
C
D
E
F
Width
Depth
Height
Grille
Lid
Grille
Length
Grille
Width
in.
45.1
10.8
24.0
9.2
35.0
6.1
cm.
114.6
27.4
61.0
23.4
88.9
15.6
5.1
56.9
in.
50.0
12.8
24.0
9.2
35.0
6.1
2.0
22.5
cm.
127.0
32.4
61.0
23.4
88.9
15.6
5.1
57.2
Slope Top
Configuration
09-12
15-18
Grille
22
G
H
2.0
22.4
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Dimensional Data - Chassis
GCLC09-12
25.4 AIR FLOW
WATER OUT
1/2 in. FPT
38.4
WATER IN
1/2 in. FPT
10.2
12.0
26.3
2.1
2.1
BLOWER ACCESS PANEL
COMPRESSOR
ACCESS PANEL
21.7
2.1
17.6
0.8
1.5
2.1
9.5
8.6
CONDENSATE
DRAIN CONNECTION
GCLC15-18
33.1 AIR FLOW
42.7
33.6
12.1
WATER OUT
1/2 in. FPT
1.5
2.10
WATER IN
1/2 in. FPT
21.7
2.1
17.6
1.0
9.6
1.5
8.6
23
9.1
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Dimensional Data - Controls Detail: Flat Top Chassis
Left Return
Right Return
Blower Option Switch
Control Panel (Remove For
Access To Control Box)
Control Panel
(Remove For Access
To Control Box)
Blower Option Switch
Wall Mount For Chassis
w/Flat Top Cabinets
Wall Mount For Chassis
w/Flat Top Cabinets
Handy Box
Handy Box
Optional
Fused/
Non-fused
Disconnect
Optional
Fused/
Non-fused
Disconnect
Optional
Ball Valves
Optional
Ball Valves
Optional
Hose Kits
Air Filter
Air Filter
Optional
Hose Kits
Dimensional Data - Controls Detail: Slope Top Chassis
Blower Option Switch
(On Side Panel)
Blower Option Switch
(On Side Panel)
Control Panel (Remove For
Access To Control Box)
Control Panel (Remove For
Access To Control Box)
Wall Mount
Attached to Unit
Wall Mount
Attached to Unit
Optional
Fused/
Non-fused
Disconnect
Optional
Fused/
Non-fused
Disconnect
Air Filter
Air Filter
Handy Box
Handy Box
Optional
Hose Kits
Optional
Ball Valves
Optional
Ball Valves
Optional
Hose Kits
24
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Physical Data
Console
Model
09
12
Compressor (1 each)
15
18
36 [1.02]
34 [1.0]
Rotary
Factory Charge R-410A, oz [kg]
27 [0.77]
27 [0.77]
Blower Motor & Blower
Blower Motor Type/Speeds
Blower Motor - hp [W]
Blower Wheel Size (Dia x W), in. [mm]
3-Spd
ECM
3-Spd
ECM
3-Spd
ECM
N/A
3 Speeds
N/A
1/4 [186]
1/4 [186]
N/A
6.0 x 6.5
[152 x 165]
6.0 x 6.5
[152 x 165]
Blower Motor Type/Speeds
PSC
Blower Motor - hp [W]
PSC
1/16 [44.7]
1/16 [44.7]
N/A
PSC
5.75 x 5.50
[146 x 140]
5.75 x 5.50
[146 x 140]
N/A
Blower Wheel Size (Dia x W), in. [mm]
2 Speeds
N/A
Coax and Water Piping
Water Connection Size - FPT - in [mm]
1/2 [12.7]
1/2 [12.7]
1/2 [12.7]
1/2 [12.7]
Coax & Piping Water Volume - gal [l]
0.15 [0.6]
0.18 [0.7]
0.15 [0.6]
0.18 [0.7]
Air Coil Dimensions (H x W), in. [mm]
8 x 22
[203 x 559]
8 x 22
[203 x 559]
8 x 30
[203 x 762]
8 x 30
[203 x 762]
Air Coil Total Face Area, ft2 [m2]
1.2 [0.114]
1.2 [0.114]
1.7 [0.16]
1.7 [0.16]
3/8 [9.5]
3/8 [9.5]
3/8 [9.5]
3/8 [9.5]
3
3
4
4
23 x 9.6
[584 x 244]
23 x 9.6
[584 x 244]
32 x 9.6
[813 x 244]
32 x 9.6
[813 x 244]
200 [91]
205 [93]
215 [98]
220 [100]
Air Coil
Air Coil Tube Size, in [mm]
Air Coil Number of Rows
Filter Standard - Throwaway, in [mm]
Weight - Packaged, lb [kg]
12/13/13
25
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Blower Performance Data
CFM
Model
Low Speed
High Speed
09
260
300
12
300
340
15
375
450
18
450
600
Air flow values are with dry coil and standard filter.
For wet coil performance, first calculate the face velocity of the air coil (face
velocity (fpm) = airflow (cfm) / face area (sq ft))
Electrical Data
09
12
LRA
Blower
Motor
FLA
Total
Unit
FLA
Min
Circ
Amp
Max
Fuse/
HACR
50.0
1.5
9.5
11.5
15
4.1
21.0
0.6
4.7
5.7
10/15
4.3
22.0
0.6
4.9
6.0
10/15
Compressor
Rated
Voltage
Voltage
Min/Max
MCC
RLA
115/60/1
104/127
12.5
8.0
208-230/60/1
187/253
6.4
265/60/1
238/292
6.7
Model
115/60/1
104/127
14.8
9.5
50.0
1.5
11.0
13.4
20
208-230/60/1
187/253
7.7
4.9
25.0
0.6
5.5
6.7
10/15
265/60/1
238/292
7.0
4.5
22.0
0.6
5.1
6.2
10/15
208-230/60/1
187/253
9.2
5.9
29.0
2.6
8.5
10.0
15
265/60/1
238/292
7.8
5.0
28.0
2.5
7.5
8.7
10/15
208-230/60/1
187/253
10.4
6.7
33.5
2.6
9.3
11.0
15
265/60/1
238/292
8.7
5.6
28.0
2.5
8.1
9.5
15
15
18
HACR circuit breaker in USA only
6/10/13
Pressure Drop
Model
09
12
15
18
GPM
Pressure Drop (psi)
30°F
50°F
70°F
90°F
110°F
1.2
1.0
0.9
0.8
0.7
0.6
1.8
2.3
2.2
2.0
1.9
1.8
2.5
3.8
3.7
3.5
3.3
3.1
1.5
0.9
0.8
0.7
0.6
0.5
2.3
1.7
1.5
1.4
1.3
1.1
3.5
3.0
2.7
2.5
2.4
2.2
2.0
1.7
1.6
1.5
1.4
1.3
3.0
3.3
3.2
3.0
2.9
2.8
4.5
5.7
5.5
5.3
5.1
4.9
3.0
1.7
1.6
1.5
1.4
1.3
4.0
4.1
4.0
3.9
3.7
3.6
5.5
7.9
7.6
7.4
7.2
6.9
6/10/13
26
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Antifreeze Corrections
Antifreeze
% by wt
Antifreeze Type
EWT - degF [DegC]
Water
Ethylene Glycol
Propylene Glycol
Ethanol
Methanol
Cooling
Capacity
Heating
Capacity
Pressure Drop
90 [32.2]
30 [-1.1]
30 [-1.1]
0
1.000
1.000
1.000
10
0.991
0.973
1.075
20
0.979
0.943
1.163
30
0.965
0.917
1.225
40
0.955
0.890
1.324
50
0.943
0.865
1.419
10
0.981
0.958
1.130
20
0.969
0.913
1.270
30
0.950
0.854
1.433
40
0.937
0.813
1.614
50
0.922
0.770
1.816
10
0.991
0.927
1.242
20
0.972
0.887
1.343
30
0.947
0.856
1.383
40
0.930
0.815
1.523
50
0.911
0.779
1.639
10
0.986
0.957
1.127
20
0.970
0.924
1.197
30
0.951
0.895
1.235
40
0.936
0.863
1.323
50
0.920
0.833
1.399
Warning: Gray area represents antifreeze concentrations greater than 35% by weight and
should be avoided due to the extreme performance penalty they represent.
Correction Factor Tables
Cooling Capacity Corrections
Entering
Air WB ºF
55
60
65
66.2
67
70
75
Total
Clg Cap
0.898
0.912
0.967
0.983
1.000
1.053
1.168
60
0.723
65
0.866
0.632
Sensible Cooling Capacity Multipliers - Entering DB ºF
70
75
80
80.6
85
90
1.048
1.185
*
*
*
*
0.880
1.078
1.244
1.260
*
*
0.694
0.881
1.079
1.085
1.270
*
0.655
0.842
1.040
1.060
1.232
*
0.616
0.806
1.000
1.023
1.193
1.330
0.693
0.879
0.900
1.075
1.250
0.687
0.715
0.875
1.040
NOTE: * Sensible capacity equals total capacity at conditions shown.
Heating Corrections
Ent Air DB °F
45
50
55
60
65
68
70
75
80
Htg Cap
1.062
1.050
1.037
1.025
1.012
1.005
1.000
0.987
0.975
Power
0.739
0.790
0.842
0.893
0.945
0.976
1.000
1.048
1.099
Heat of Ext
1.158
1.130
1.096
1.064
1.030
1.012
1.000
0.970
0.930
11/10/09
27
95
*
*
*
*
*
1.404
1.261
100
*
*
*
*
*
*
1.476
Power
Input
0.985
0.994
0.997
0.999
1.000
1.003
1.007
Heat of
Rejection
0.913
0.927
0.972
0.986
1.000
1.044
1.141
11/10/09
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Operating Limits
Cooling
Operating Limits
Air Limits
Min. Ambient Air
Rated Ambient Air
Max. Ambient Air
Min. Entering Air
Rated Entering Air db/wb
Max. Entering Air db/wb
Water Limits
Min. Entering Water
Normal Entering Water
Max. Entering Water
Heating
(°F)
(°C)
(°F)
(°C)
45
80
100
50
80.6/66.2
110/83
7.2
26.7
37.8
10.0
27/19
43/28.3
45
70
85
40
68
80
7.2
21.1
29.4
4.4
20.0
26.7
30
50-110
120
-1.1
10-43.3
48.9
20
30-70
90
-6.7
-1.1
32.2
NOTE: Minimum/maximum limits are only for start-up conditions, and are meant
for bringing the space up to occupancy temperature. Units are not designed to
operate at the minimum/maximum conditions on a regular basis. The operating
limits are dependent upon three primary factors: 1) water temperature, 2) return
air temperature, and 3) ambient temperature. When any of the factors are at the
minimum or maximum levels, the other two factors must be at the normal level for
proper and reliable unit operation.
Reference Calculations
Heating Calculations:
LWT = EWT -
LAT = EAT +
HE
gpm x 500
HC
cfm x 1.08
Cooling Calculations:
LWT = EWT +
HR
gpm x 500
LAT(DB) = EAT(DB) -
SC
cfm x 1.08
LC = TC - SC
TH = HC + HWC
S/T =
SC
TC
28
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Legend and Notes
ABBREVIATIONS AND DEFINITIONS:
cfm
EWT
gpm
WPD
EAT
=
=
=
=
=
HC
TC
SC
KW
HR
=
=
=
=
=
airflow, cubic feet/minute
entering water temperature, Fahrenheit
water flow in gallons/minute
water pressure drop, psi and feet of water
entering air temperature, Fahrenheit
(dry bulb/wet bulb)
air heating capacity, MBtu/h
total cooling capacity, MBtu/h
sensible cooling capacity, MBtu/h
total power unit input, kilowatts
total heat of rejection, MBtu/h
HE
= total heat of extraction, MBtu/h
HWC = hot water generator capacity, MBtu/h
EER = Energy Efficient Ratio
= Btu output/Watt input
COP = Coefficient of Performance
= Btu output/Btu input
LWT = leaving water temperature, °F
LAT = leaving air temperature, °F
TH
= total heating capacity, MBtu/h
LC
= latent cooling capacity, MBtu/h
S/T = sensible to total cooling ratio
Notes (Refer to Performance Data tables)
• Performance ratings are based on 80°F DB / 67°F WB EAT for cooling and 70°F DB EAT for heating.
• Three flow rates are shown for each unit. The lowest flow rate shown is used for geothermal open loop/well water systems with a
minimum of 50°F EWT. The middle flow rate shown is the minimum geothermal closed loop flow rate. The highest flow rate shown is
optimum for geothermal closed loop systems and the suggested flow rate for boiler/ tower applications.
• The hot water generator numbers are based on a flow rate of 0.4 gpm/ton of rated capacity with an EWT of 90°F.
• Entering water temperatures below 40°F assumes 15% antifreeze solution.
• For non-standard EAT conditions, apply the appropriate correction factors on (Refer to Correction Factor Tables).
• Interpolation between EWT, gpm, and cfm data is permissible.
29
ASTON LOW SILL SERIES SPECIFICATION CATALOG
GCL*09 - Performance Data
Single Speed PSC (300 cfm)
EWT
°F
20
30
40
50
60
70
80
90
100
110
120
WPD
Flow
GPM
PSI
FT
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.2
1.8
2.5
1.1
2.4
3.8
1.0
2.3
3.8
1.0
2.3
3.8
0.9
2.2
3.7
0.9
2.1
3.6
0.8
2.0
3.5
0.8
2.0
3.4
0.7
1.9
3.3
0.7
1.8
3.2
0.6
1.8
3.1
0.6
1.7
3.0
2.5
5.5
8.8
2.3
5.3
8.8
2.3
5.3
8.8
2.1
5.1
8.5
2.1
4.9
8.3
1.8
4.6
8.1
1.8
4.6
7.9
1.6
4.4
7.6
1.6
4.2
7.4
1.4
4.2
7.2
1.4
3.9
6.9
HC
Mbtu/h
HEATING - EAT 70°F
Power
HE
LAT
kW
Mbtu/h
°F
COP
TC
Mbtu/h
SC
MBtu/h
Operation not recommended
6.3
7.5
7.4
8.3
8.5
8.8
9.2
9.6
9.9
10.3
10.7
10.9
11.3
11.9
12.2
12.5
12.9
13.5
13.7
13.9
0.67
4.0
87.3
Operation not recommended
0.72
5.0
91.0
0.72
5.0
90.9
Operation not recommended
0.75
5.7
93.6
0.75
5.9
94.2
0.76
6.2
95.3
0.77
6.6
96.3
0.78
6.9
97.6
0.79
7.2
98.4
0.79
7.6
99.7
0.81
8.0
101.1
0.81
8.1
101.6
0.82
8.5
103.0
0.83
9.0
104.6
0.82
9.4
105.6
0.83
9.7
106.6
0.85
10.0
107.7
0.84
10.6
109.5
0.85
10.8
110.2
0.86
10.9
110.8
Operation not recommended
30
COOLING - EAT 80/67°F
S/T
Power
HR
Ratio
kW
MBtu/h
EER
Operation not recommended
2.74
3.02
3.02
12.2
12.4
8.1
8.3
3.26
3.32
3.41
3.50
3.60
3.68
3.79
3.91
3.94
4.06
4.19
4.33
4.39
4.47
4.70
4.71
4.73
11.6
11.9
10.7
11.0
11.4
10.1
10.4
10.8
9.5
9.9
10.3
9.1
9.3
9.6
8.7
8.8
9.0
7.9
8.1
7.5
7.7
7.9
7.2
7.4
7.6
7.0
7.2
7.4
6.8
6.9
7.1
6.7
6.7
6.8
8.2
8.3
6.5
6.6
7.5
7.7
6.2
6.3
6.8
6.9
5.8
5.9
Operation not recommended
0.67
0.50
13.9
0.67
0.47
14.0
Operation not recommended
0.68
0.56
13.5
0.68
0.52
13.7
0.70
0.65
12.9
0.70
0.61
13.1
0.69
0.58
13.4
0.72
0.71
12.5
0.71
0.67
12.7
0.71
0.64
13.0
0.73
0.76
12.1
0.73
0.73
12.4
0.72
0.70
12.6
0.75
0.82
11.9
0.74
0.79
12.0
0.74
0.76
12.2
0.77
0.90
11.8
0.76
0.86
11.7
0.76
0.83
11.8
Operation not recommended
0.79
0.93
11.4
0.79
0.90
11.4
Operation not recommended
0.83
1.00
10.9
0.82
0.97
11.0
Operation not recommended
0.86
1.08
10.4
0.86
1.05
10.5
24.3
26.2
20.8
22.7
16.5
17.9
19.8
14.4
15.5
17.0
12.5
13.5
14.8
11.0
11.9
12.6
9.7
10.3
10.9
8.8
9.3
7.5
7.9
6.2
6.6
6/20/11
ASTON LOW SILL SERIES SPECIFICATION CATALOG
GCL*12 - Performance Data
Single Speed PSC (340 cfm)
EWT
°F
20
30
40
50
60
70
80
90
100
110
120
WPD
Flow
GPM
PSI
FT
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.5
2.3
3.5
1.0
1.7
3.2
0.9
1.7
3.0
0.9
1.6
2.9
0.8
1.5
2.7
0.8
1.4
2.6
0.7
1.4
2.5
0.7
1.3
2.5
0.6
1.3
2.4
0.6
1.2
2.3
0.5
1.1
2.2
0.5
1.1
2.1
2.3
3.9
7.4
2.1
3.9
6.9
2.1
3.7
6.7
1.8
3.5
6.2
1.8
3.2
6.0
1.6
3.2
5.8
1.6
3.0
5.8
1.4
3.0
5.5
1.4
2.8
5.3
1.2
2.5
5.1
1.2
2.5
4.9
HC
Mbtu/h
HEATING - EAT 70°F
Power
HE
LAT
kW
Mbtu/h
°F
COP
TC
Mbtu/h
SC
MBtu/h
Operation not recommended
8.1
9.3
9.3
10.3
10.6
11.0
11.3
11.9
12.2
12.6
13.2
13.5
13.9
14.4
14.9
15.2
15.6
16.2
16.5
16.7
0.85
5.2
90.1
Operation not recommended
0.89
6.3
93.3
0.91
6.2
93.3
Operation not recommended
0.92
7.1
96.0
0.94
7.4
96.8
0.94
7.8
97.9
0.95
8.1
98.9
0.97
8.6
100.3
0.98
8.9
101.4
0.99
9.2
102.3
1.01
9.7
103.8
1.01
10.1
104.8
1.02
10.4
105.8
1.04
10.9
107.3
1.07
11.2
108.5
1.08
11.5
109.3
1.10
11.8
110.4
1.12
12.4
112.2
1.14
12.6
112.8
1.15
12.8
113.5
Operation not recommended
31
COOLING - EAT 80/67°F
S/T
Power
HR
Ratio
kW
MBtu/h
EER
Operation not recommended
2.80
3.07
2.99
14.2
14.3
8.8
9.0
3.28
3.30
3.43
3.49
3.59
3.68
3.74
3.84
3.92
3.98
4.07
4.09
4.12
4.17
4.24
4.25
4.26
13.5
13.9
12.5
12.9
13.4
11.9
12.2
12.7
11.3
11.6
12.1
10.7
11.0
11.3
10.2
10.3
10.6
8.6
8.8
8.1
8.3
8.6
7.9
8.0
8.3
7.6
7.8
8.0
7.4
7.6
7.7
7.3
7.4
7.5
9.6
9.8
7.1
7.1
8.8
9.0
6.7
6.8
7.9
8.1
6.4
6.5
Operation not recommended
0.62
0.62
16.3
0.63
0.58
16.3
Operation not recommended
0.63
0.68
15.8
0.63
0.64
16.1
0.65
0.78
15.2
0.65
0.75
15.4
0.64
0.70
15.8
0.66
0.85
14.8
0.66
0.82
15.0
0.65
0.77
15.4
0.67
0.92
14.4
0.67
0.89
14.6
0.67
0.85
14.9
0.69
1.00
14.1
0.69
0.95
14.2
0.68
0.92
14.5
0.72
1.08
13.9
0.72
1.03
13.9
0.71
1.00
14.0
Operation not recommended
0.74
1.12
13.5
0.73
1.09
13.5
Operation not recommended
0.76
1.21
12.9
0.76
1.18
13.0
Operation not recommended
0.80
1.31
12.4
0.80
1.27
12.4
22.8
24.6
19.7
21.7
15.9
17.2
19.2
13.9
14.9
16.5
12.2
13.0
14.2
10.7
11.5
12.2
9.4
10.0
10.6
8.6
9.0
7.3
7.7
6.0
6.4
6/20/11
ASTON LOW SILL SERIES SPECIFICATION CATALOG
GCL*15 - Performance Data
3-Speed ECM (450 cfm)
EWT
°F
20
30
40
50
60
70
80
90
100
110
120
WPD
Flow
GPM
PSI
FT
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
2.0
3.0
4.5
1.5
5.1
6.1
1.5
5.0
6.0
1.4
4.9
5.9
1.4
4.8
5.8
1.3
4.7
5.7
1.3
4.6
5.5
1.2
4.5
5.4
1.2
4.4
5.3
1.2
4.3
5.2
1.1
4.2
5.1
1.1
4.1
5.0
3.5
11.8
14.2
3.5
11.6
13.9
3.2
11.3
13.6
3.2
11.1
13.4
3.0
10.9
13.2
3.0
10.6
12.7
2.8
10.4
12.5
2.8
10.2
12.2
2.8
9.9
12.0
2.5
9.7
11.8
2.5
9.5
11.6
HC
Mbtu/h
HEATING - EAT 70°F
Power
HE
LAT
kW
Mbtu/h
°F
COP
TC
Mbtu/h
SC
MBtu/h
Operation not recommended
9.7
12.5
11.1
13.5
13.1
1.05
6.2
88.0
Operation not recommended
1.10
8.8
93.8
1.08
7.4
90.8
Operation not recommended
1.11
9.7
95.8
1.11
9.4
95.0
14.1
14.5
15.2
15.2
15.7
16.4
1.12
1.12
1.13
1.13
1.13
1.14
16.3
16.8
17.6
18.3
18.7
19.3
20.3
20.6
1.14
1.14
1.15
1.14
1.15
1.16
1.14
1.16
20.9
1.17
10.3
10.7
11.3
11.4
11.8
12.5
12.4
12.9
13.7
14.4
14.8
15.3
16.4
16.7
17.0
97.0
97.9
99.2
99.3
100.3
101.7
101.6
102.7
104.3
105.7
106.6
107.7
109.8
110.5
111.1
EER
Operation not recommended
2.72
3.33
3.02
17.0
17.2
3.55
3.48
3.70
3.79
3.92
3.95
4.05
4.20
4.19
4.31
4.49
4.71
4.77
4.87
5.22
5.23
5.25
16.9
17.2
16.7
16.9
17.3
15.7
15.8
16.1
14.6
14.7
14.9
15.1
15.3
15.6
15.7
15.9
16.2
15.0
15.2
Operation not recommended
COOLING - EAT 80/67°F
S/T
Power
HR
Ratio
kW
MBtu/h
13.8
14.1
12.7
13.0
Operation not recommended
0.70
19.4
0.71
0.71
19.5
0.67
Operation not recommended
0.70
19.6
11.8
0.78
12.0
0.70
0.73
19.7
0.70
19.7
11.7
0.88
0.69
19.8
11.7
0.84
0.69
19.9
11.8
0.79
0.74
19.0
11.5
0.97
0.73
19.0
11.6
0.93
11.7
0.73
0.88
19.1
0.78
18.2
11.4
1.05
11.5
0.78
1.02
18.2
0.77
18.2
11.6
0.97
0.72
19.1
10.9
1.15
0.72
19.1
11.0
1.10
11.1
0.71
1.06
19.2
0.66
19.9
10.4
1.25
0.66
20.0
10.5
1.19
0.65
20.2
10.6
1.16
Operation not recommended
0.68
19.4
10.1
1.32
10.2
0.67
1.27
19.5
Operation not recommended
0.70
18.7
9.7
1.43
0.69
18.9
9.8
1.39
Operation not recommended
0.73
18.0
9.3
1.56
0.73
18.2
9.4
1.52
11.9
12.2
23.7
25.6
21.7
23.7
18.9
20.1
22.0
16.2
17.0
18.4
13.8
14.5
15.5
13.2
14.0
14.7
12.5
13.3
14.1
11.4
11.9
9.7
10.1
8.1
8.5
6/10/13
32
ASTON LOW SILL SERIES SPECIFICATION CATALOG
GCL*18 - Performance Data
3-Speed ECM (600 cfm)
EWT
°F
20
30
40
50
60
70
80
90
100
110
120
WPD
Flow
GPM
PSI
FT
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.0
4.0
5.5
3.3
5.4
9.2
3.2
5.3
9.0
3.1
5.1
9.1
3.0
5.0
8.9
2.9
4.8
8.6
2.8
4.7
8.3
2.7
4.5
8.0
2.6
4.3
7.7
2.5
4.2
7.5
2.4
4.0
7.2
2.3
3.9
6.9
7.6
12.5
21.3
7.4
12.2
HC
Mbtu/h
HEATING - EAT 70°F
Power
HE
LAT
kW
Mbtu/h
°F
COP
TC
Mbtu/h
SC
MBtu/h
Operation not recommended
11.5
14.1
1.32
7.0
89.2
Operation not recommended
1.34
9.5
94.2
20.8
7.2
11.8
21.0
13.2
6.9
11.6
20.6
6.7
11.1
19.9
6.5
10.9
19.2
6.2
10.4
18.5
6.0
9.9
17.8
5.8
9.7
17.3
5.5
9.2
16.6
5.3
9.0
15.9
16.9
17.2
17.6
18.7
19.0
19.5
1.44
1.45
1.46
1.50
1.50
1.51
20.6
20.9
21.4
21.8
22.1
22.5
23.0
23.4
1.56
1.56
1.57
1.56
1.58
1.59
1.57
1.59
23.7
1.61
15.6
15.4
1.35
8.5
92.4
Operation not recommended
1.39
10.8
96.9
1.41
10.6
96.5
12.0
12.2
12.6
13.6
13.9
14.3
15.2
15.5
16.0
16.4
16.7
17.1
17.6
17.9
18.2
99.3
99.8
100.5
102.7
103.2
104.0
106.1
106.7
107.5
108.3
109.0
109.7
110.6
111.3
111.9
EER
Operation not recommended
2.55
3.09
2.85
20.2
20.5
3.28
3.20
3.43
3.47
3.53
3.66
3.70
3.77
3.87
3.92
3.99
4.08
4.11
4.15
4.29
4.30
4.31
20.3
20.5
20.2
20.3
20.5
18.9
19.0
19.1
17.6
17.6
17.7
16.5
16.6
16.8
15.4
15.6
15.9
14.6
14.8
Operation not recommended
COOLING - EAT 80/67°F
S/T
Power
HR
Ratio
kW
MBtu/h
13.4
13.7
12.0
12.2
Operation not recommended
0.62
23.4
0.93
0.63
23.5
0.88
Operation not recommended
0.65
23.6
13.2
0.98
13.4
0.65
0.94
23.7
0.68
23.8
13.8
1.06
0.68
23.9
13.9
1.04
0.68
23.9
14.0
1.00
0.71
22.9
13.5
1.18
0.71
22.9
13.5
1.15
13.6
0.71
1.11
22.9
0.75
22.0
13.1
1.29
13.1
0.75
1.26
21.9
0.74
21.9
13.2
1.21
0.77
21.4
12.7
1.44
0.77
21.3
12.8
1.37
12.8
0.76
1.33
21.4
0.80
20.7
12.3
1.56
0.79
20.7
12.4
1.49
0.78
20.9
12.5
1.44
Operation not recommended
0.81
20.1
11.8
1.63
11.9
0.81
1.58
20.2
Operation not recommended
0.84
19.4
11.2
1.76
0.83
19.5
11.4
1.71
Operation not recommended
0.90
18.5
10.8
1.92
0.89
18.6
10.9
1.86
12.6
12.8
21.7
23.4
20.6
21.9
19.0
19.6
20.6
16.1
16.5
17.3
13.6
14.0
14.6
11.5
12.1
12.7
9.8
10.5
11.1
9.0
9.4
7.6
8.0
6.2
6.6
6/10/13
33
34
B Cool
T6
White (18)
Overide
Shut down
J1
Orange (14)
Continuous
Cycled
Fan Mode Switch
Green
Red (19)
DH
W
Y2
Y1
G
O/B
C
LO
R
ACC NC
ACC NO
C
K6-Acc
Relay
K5-Alarm
Relay
RS485 NET
C
R
F FG CC CCG
Note 2
R
-
RS485 NET
JW2
P8
Com2
LED5
G
P9
+ P7
G
Com1
LED5
K4-Fan Relay
R
P1
ALG
ACC COM
C
CC2 CC2 CC2 P5
HI LO G
C
R
-
RS485 EXP
Green
(00)
Condensate
Brown (23)
LP
HP
SW1
Test Mode
Y1
G
Status
LED3
G
CC
FP1 – 15°F/30°F
FP2 – 15°F/30°F
RV – B/O
Acc – Dip 4
Acc – Dip 5
CC – Dual/Single
L Output Type
Future Use
Fault
LED1
R
Config
LED2
Y
Yellow
SW2
Off
On
1
2
3
4
5
6
7
8
P13
C
CFM
PWM
F
F1-3A
R
C
Black/White
REV REV FP1 FP1 FP2 FP2 LPS LPS HPS HPS P4
+ P6 CO C EH1 C EH2 P3
Aurora Base Control
(ABC)
K3-CC2 Relay
DOWN
Not Used
Red (17)
F
K2-CC Relay
SHUT
Blue (T6)
Orange (14)
Yellow (13)
CC
K1-RV Relay
T5
T6
T4
T2
LS
ALM
CC2
Black (15)
Red
ES
EH1
Yellow
Orange
P2
Orange (01)
Fan
Red (19)
470Ÿ
Resistor
Yellow
2
Auto
Orange (02)
T1
1
FD
Red 208V
Transformer
Blue (07)
T4
T3
3
RV
Note 1
470Ÿ
T5
T2
Red (11)
Yellow
Blue 230V/265V
Black
Black (09)
Red (11)
Black (12)
5
Red (32)
Black (31)
G
Unit
Power Supply
208-230/60/1 or
265-277/60/1
Black (10)
T3
AC
6
4
L1
Ground
Lug
24V
Blue (08)
T1
A Heat
Red
Yellow (13)
T1
CC
Handi - Box
Violet (14)
White (12)
T
ST
Mode Switch
Black (12)
L2
Red
Black (13)
CC
RB
24 V
Black
Black
Black (27)
White (28)
T2
Tan (33)
Black
Compressor
RV
mistor
Ther
4 RB 2
Cap
Brn/Wht
R
C
T
IN
PUT
Brn
White (28)
Low
Red (30)
BlackRed
(25)
High
Black (29)
L
PSC
Fan
Motor
S
24V Emergency
Shutdown
Red
Electronic THERMOSTAT
Fan Speed
Switch
H
Grn
Blue
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Wiring Schematics
ABC - with PSC Motor and Electronic Stat - 208-230-265/60/1
ES
Red
ES
Yellow
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Wiring Schematics cont.
ABC - with PSC Motor and Electronic Stat - 208-230-265/60/1
Accessory Relay
Operation
SW2-4 SW2-5
On
On
Cycle with Blower
Off
Off
Cycle with Compressor
Off
On
Water Valve Slow Open
Off
On
Outdoor Air Damper
Aurora Timing Events
Normal Mode
Test Mode
Event
5 to 80 seconds
1 second
Random Start Delay
5 seconds
< 1 second
Compressor On Delay
2 minutes
5 seconds
Compressor Minimum On Time
4 minutes
15 seconds
Compressor Short Cycle Delay
30 seconds
2 seconds
Blower Off Delay
Less than 1 second Less than 1 second
Fault Recognition Delay – High Pressure
2 minutes
30 seconds
Start-Up Bypass – Low Pressure
30 seconds
30 seconds
Fault Recognition Delay – Low Pressure
2 minutes
30 seconds
Start-Up Bypass – Low Water/Air Coil Limit
30 seconds
30 seconds
Fault Recognition Delay – Low Water/Air Coil Limit
30 seconds
30 seconds
Fault Recognition Delay – Condensate Overflow
2 seconds
2 seconds
Thermostat Call Recognition Time
5 minutes
20 seconds
Auxiliary Heat Staging Delay
2 minutes
7.5 seconds
Emergency Heat Staging Delay
90 seconds
90 seconds
Water Valve Slow Open Delay
30 seconds
30 seconds
Reheat Delay
Aurora LED Flash Codes
1 second on and 1 second off
100 milliseconds on and 100 milliseconds off
100 milliseconds on and 400 milliseconds off with a 2 second pause before repeating
Random Start Delay
Fast Flash
Status LED (LED1, Green)
Fast Flash
Configuration LED (LED2, Yellow)
Fast Flash
Fault LED (LED3, Red)
Configuration LED (LED2, Yellow)
Fault LED (LED3, Red)
Status LED (LED1, Green)
OFF
No Software Overide
Flash ECM Setting Normal Mode
Normal Mode
ON
Flash Code 1
DIP Switch Overide
Slow Flash
Input Fault Lockout
OFF
Control is Non-Functional
Fast Flash
High Pressure Lockout
Flash Code 2
Test Mode
Slow Flash ECM Configure Mode
Off
Low Pressure Lockout
Flash Code 3
Fast Flash Reset Configure Mode
Lockout Active
Flash Code 4
Low Air Coil Limit Lockout - FP2
Flash Code 2
Dehumidification Mode
Low Water Coil Limit Lockout - FP1 Flash Code 5
Flash Code 3
Reserved
Reserved
Flash Code 6
Flash Code 4
Reserved
Flash Code 7
Condensate Overflow Lockout
Flash Code 5
Load Shed
Over/Under Voltage Shutdown
Flash Code 8
ESD
Flash Code 6
Flash Code 9
Flash Code 7
Reserved
Reserved
Flash Code 10
Reserved
Air/Water Coil Limit Sensor Error
Flash Code 11
Slow Flash
Fast Flash
Flash Code
G
Light Emitting Diode - Green
Y
Light Emitting Diode - Yellow
CC – Dual/Single
6
L – Pulse/Continuous
7
Reheat/Normal
8
P3
G
(+)
(-)
R
C
Com2
G
Acc – K6
P9
P7
P8
F
G
(+)
(-)
R
C
RS 485
Com1
P11
Alarm – K5
P6
RS485 Exp
AURORA BASE
CONTROL™
EH2
C
EH1
C
CO
N/A
Factory Fan Connection
Y2
C
C
3A-Fuse
W
DH
DH
Y2
W
G
O/B
R
Y1
Y1
G
C
R
LO
ACC nc
ES
35
Field Connections
P1
O/B
Field Connections
P2
ACC c
SW1 – Push button
SW2 – DIP package 8 position
PB – Power Block
RB – Blower Relay
RV – Reversing Valve Coil
LO
Y1
JW2 Alarm
C
C
Light Emitting Diode - Red
Config
Factory
5
EH1
Y
SW2
Fan – K4
ALG
R
4
ACC – Dip 5
LED2
CC Hi – K3
CC
Wire nut
CC – Compressor Contactor
CO – Condensate Overflow Sensor
ES – Emergency Shutdown
HP – High Pressure Switch
LP – Low Pressure Switch
FD – Freeze Detection Sensor
F1 – Fuse
P5
LS
Temperature Switch
ACC – Dip 4
Factory Use
Polarized connector
G
LO
HI
CCG
CC
FG
F
R
Factory
CC2
Switch - Low pressure
ALM
Fuse
3
Status
CC – K2
Switch - High pressure
1
Capacitor
G
CC2
Ground
Relay Contacts – N.O., N.C.
RV – B/O
LED3
SW1 Test
Switch - Condensate Overflow
2
Field Wiring Lug
2
RV – K1
Relay Coil
3
L1
On
1
FP2 – 15oF/30oF
Fault
Thermistor
T
FP1 – 15oF/30oF
R
P13
ACC no
Factory Low Voltage Wiring
Factory Line Voltage Wiring
Field Low Voltage Wiring
Field Line Voltage Wiring
Optional Block
DC Voltage PCB Traces
Field Zone Sensor Wiring
Internal Junction
Quick Connect Terminal
Off
LED1
ECM PWM
RS485 NET
Legend
P4
Factory
HP
HP
LP
LP
FP2
FP2
FP1
FP1
REV
REV
C
PWM
CFM
Notes:
1 – Swap blue and red leads for 208V operation.
2 – Use ALG Output for 24V lockout.
R
R
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Wiring Schematics cont.
ABC - PSC Motor with Remote Stat - 208-230-265/60/1
Compressor
S
Unit
Power Supply
208-230/60/1 or
265/60/1
C
Blu
Ground
Lug
Blk
Brn/Wht
Brn
T1
T2
CC
Cap
L2
White (28)
L
L1
Black
White (28)
White
Black (29)
Fan Speed
Switch
Black
Blue 230V/265V
Red (30)
High
G
Handi - Box
Tan
Grn
H
R
Red
PSC
Fan
Motor
Low
Note 1
Red 208V
Transformer
BlackRed
(25)
4 RB 2
Black (27)
Yellow
C
Fan
G
Compressor A
Y1
Electric Heat
W
K1-RV Relay
O
K3-CC2 Relay
Reversing Valve
K2-CC Relay
C
R
K5-Alarm
Relay
ACC NC
F1-3A
F
PWM
K6-Acc
Relay
Aurora Base Control
(ABC)
LO
R
SW1
Test Mode
CFM
Status
LED3
G
O/B
G
FP1 – 15°F/30°F
FP2 – 15°F/30°F
RV – B/O
Acc – Dip 4
Acc – Dip 5
CC – Dual/Single
L Output Type
Future Use
Y1
Y2
W
DH
P1
RS485 NET
R
LO2
C
Com2
LED5
G
Com1
LED5
RS485 NET
P8
C
R
-
G
+ P7
Config
LED2
Y
RS485 EXP
C
R
-
+ P6 CO C EH1 C EH2 P3
Y2
Class 2
Black/
White
Brown (23)
Green
(00)
Black/
White
C
Fault
LED1
R
C
DH
Red
Yellow
Black (09)
Black (10)
Blue (08)
Blue (07)
Yellow
REV REV FP1 FP1 FP2 FP2 LPS LPS HPS HPS P4
ACC COM
LO1
Red
470Ÿ
CC2 CC2 CC2 P5
HI LO G
Orange (02)
F FG CC CCG
Orange (01)
Black (15)
LS
LS
ALM
24VAC Common
Lockout Circuit B
R
K4-Fan Relay
ES
ACC NO
Compressor B
P9
Black (13)
ES
R
Dehumidification
C
HP
P2
ALG
24VAC
F
Yellow
Violet (14)
Load Shed
Lockout Circuit A
CC
LP
T
CC
White (12)
RV
RB
Emerg Shutdown
CC2
JW2
EH1
TB
FD
Condensate
Note 2
36
Y1
G
CC
P13
On
1
2
3
4
5
6
7
8
SW2
Off
ES
RV
ES
Black/White
470Ÿ
Resistor
Black (27)
24V Emergency
Shutdown
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Wiring Schematics cont.
ABC - PSC Motor with Remote Stat - 208-230-265/60/1
Notes:
Aurora Timing Events
Test Mode
Normal Mode
Event
5 to 80 seconds
1 second
Random Start Delay
5 seconds
< 1 second
Compressor On Delay
2 minutes
5 seconds
Compressor Minimum On Time
4 minutes
15 seconds
Compressor Short Cycle Delay
30 seconds
2 seconds
Blower Off Delay
Less than 1 second Less than 1 second
Fault Recognition Delay – High Pressure
2 minutes
30 seconds
Start-Up Bypass – Low Pressure
30 seconds
30 seconds
Fault Recognition Delay – Low Pressure
2 minutes
30 seconds
Start-Up Bypass – Low Water/Air Coil Limit
30 seconds
30 seconds
Fault Recognition Delay – Low Water/Air Coil Limit
30 seconds
30 seconds
Fault Recognition Delay – Condensate Overflow
2 seconds
2 seconds
Thermostat Call Recognition Time
5 minutes
20 seconds
Auxiliary Heat Staging Delay
2 minutes
7.5 seconds
Emergency Heat Staging Delay
90 seconds
90 seconds
Water Valve Slow Open Delay
30 seconds
30 seconds
Reheat Delay
1 – Swap blue and red leads for 208V operation.
2 - When field installed 24VAC motorized valve is used, connect
to C and Y.
Accessory Relay
Operation
SW2-4 SW2-5
On
On
Cycle with Blower
Off
Off
Cycle with Compressor
Off
On
Water Valve Slow Open
Off
On
Outdoor Air Damper
Aurora LED Flash Codes
1 second on and 1 second off
100 milliseconds on and 100 milliseconds off
100 milliseconds on and 400 milliseconds off with a 2 second pause before repeating
Random Start Delay
Fast Flash
Status LED (LED1, Green)
Fast Flash
Configuration LED (LED2, Yellow)
Fast Flash
Fault LED (LED3, Red)
Configuration LED (LED2, Yellow)
Fault LED (LED3, Red)
Status LED (LED1, Green)
No Software Overide
Flash ECM Setting Normal Mode
OFF
Normal Mode
ON
DIP Switch Overide
Slow Flash
Input Fault Lockout
Flash Code 1
OFF
Control is Non-Functional
Flash Code 2
Fast Flash
High Pressure Lockout
Test Mode
Slow Flash ECM Configure Mode
Flash Code 3
Off
Low Pressure Lockout
Fast Flash Reset Configure Mode
Lockout Active
Flash Code 4
Low Air Coil Limit Lockout - FP2
Flash Code 2
Dehumidification Mode
Low Water Coil Limit Lockout - FP1 Flash Code 5
Flash Code 3
Reserved
Flash Code 6
Reserved
Flash Code 4
Reserved
Flash Code 7
Condensate Overflow Lockout
Flash Code 5
Load Shed
Flash Code 8
Over/Under Voltage Shutdown
ESD
Flash Code 6
Flash Code 9
Flash Code 7
Reserved
Reserved
Flash Code 10
Reserved
Flash Code 11
Air/Water Coil Limit Sensor Error
P5
EH1
Y
Config
Factory
P3
Fan – K4
G
Com2
G
Acc – K6
G
P9
(+)
(-)
R
P8
F
CC
P7
C
P11
Alarm – K5
(+)
(-)
R
C
RS 485
Com1
EH2
C
EH1
C
CO
N/A
P6
RS485 Exp
AURORA BASE
CONTROL™
CC Hi – K3
Factory Fan Connection
Y2
C
C
3A-Fuse
W
DH
DH
Y2
W
G
Y1
Y1
G
O/B
Field Connections
P1
ACC nc
ACC c
ACC no
LS
ES
37
ALG
Field Connections
P2
ALM
SW1 – Push button
SW2 – DIP package 8 position
PB – Power Block
RB – Blower Relay
RV – Reversing Valve Coil
LO
Y1
JW2 Alarm
O/B
C
Wire nut
CC – Compressor Contactor
CO – Condensate Overflow Sensor
ES – Emergency Shutdown
HP – High Pressure Switch
LP – Low Pressure Switch
FD – Freeze Detection Sensor
F1 – Fuse
7
8
C
Light Emitting Diode - Red
6
Reheat/Normal
R
Light Emitting Diode - Yellow
CC – Dual/Single
L – Pulse/Continuous
R
Y
5
Factory Use
Light Emitting Diode - Green
G
LO
HI
CCG
CC
FG
F
R
Factory
Polarized connector
R
4
ACC – Dip 5
LED2
SW2
LO
Fuse
Temperature Switch
ACC – Dip 4
Status
CC – K2
CC2
Switch - Low pressure
1
Capacitor
G
SW1 Test
Switch - High pressure
G
3
LED3
CC2
Ground
Relay Contacts – N.O., N.C.
RV – B/O
Fault
Switch - Condensate Overflow
2
Field Wiring Lug
2
RV – K1
Relay Coil
3
L1
On
1
FP2 – 15oF/30oF
P13
Thermistor
T
FP1 – 15oF/30oF
R
C
Factory Low Voltage Wiring
Factory Line Voltage Wiring
Field Low Voltage Wiring
Field Line Voltage Wiring
Optional Block
DC Voltage PCB Traces
Field Zone Sensor Wiring
Internal Junction
Quick Connect Terminal
Off
LED1
ECM PWM
RS485 NET
Legend
P4
Factory
HP
HP
LP
LP
FP2
FP2
FP1
FP1
REV
REV
C
PWM
CFM
Slow Flash
Fast Flash
Flash Code
R
R
High
38
T5
B Cool
T6
Not Used
White (18)
Shut down
Overide
J1
Orange (14)
Continuous
Cycled
Fan Mode Switch
Green
Red (19)
DH
W
Y2
Y1
G
O/B
C
LO
R
ACC NC
ACC NO
C
K6-Acc
Relay
K5-Alarm
Relay
RS485 NET
C
R
-
RS485 NET
JW2
P8
Com2
LED5
G
F FG CC CCG
+ P7
G
Com1
LED5
K4-Fan Relay
R
P1
ALG
ACC COM
R
CC2 CC2 CC2 P5
HI LO G
C
R
-
RS485 EXP
Note 3
Green
(00)
Condensate
Brown (23)
470Ÿ
Resistor
LP
HP
SW1
Test Mode
Y1
G
Status
LED3
G
CC
Config
LED2
Y
FP1 – 15°F/30°F
FP2 – 15°F/30°F
RV – B/O
Acc – Dip 4
Acc – Dip 5
CC – Dual/Single
L Output Type
Future Use
Fault
LED1
R
R
C
SW2
Off
On
1
2
3
4
5
6
7
8
P13
C
CFM
PWM
F
F1-3A
Black/White
Yellow
REV REV FP1 FP1 FP2 FP2 LPS LPS HPS HPS P4
+ P6 CO C EH1 C EH2 P3
Aurora Base Control
(ABC)
K3-CC2 Relay
DOWN
Blue (T6)
Red (17)
P9
K2-CC Relay
SHUT
Yellow (13)
Orange (14)
C
K1-RV Relay
T5
T6
T4
T2
F
White (12)
T4
CC
Violet (14)
LS
ALM
CC2
Black (13)
Orange
ES
EH1
Black (15)
T1
P2
Orange (01)
Fan
Red (19)
FD
Yellow
2
Auto
Yellow
RV
Red 208V
Yellow
T3
1
5
NOTE 1
Orange (02)
Red
3
6
4
Blue 230V/265V
Black
Blue (07)
T2
Red (11)
Yellow (13)
Mode Switch
Black (12)
Red (32)
Black (31)
24V
470Ÿ
Red (11)
Black (12)
Red
T
ST
Black (27)
L1
G
Unit
Power Supply
208-230/60/1 or
265-277/60/1
Black (10)
T3
AC
24 V
Black
Black
Red
RB 2
T1
CC
Handi - Box
Ground
Lug
Transformer
T
mistor
Ther
4
L2
Red
Black
Compressor
Black (09)
T1
Blue
Low
Black
Red
T2
Tan (33)
R
C
CC
Blue (08)
A Heat
Black (25)
White
S
RB
RV
IN
PUT
ECM
ECM
Motor
Motor
Module
Module
Yellow
Blue
24V Emergency
Shutdown
Red
Electronic THERMOSTAT
Fan Speed
Switch
Note 3
Green/Yellow
ECM
Motor
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Wiring Schematics cont.
ABC - with ECM Motor and Electronic Stat - 208-230-265/60/1
Red
ES
ES
Yellow
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Wiring Schematics cont.
ABC - with ECM Motor and Electronic Stat - 208-230-265/60/1
Accessory Relay
Operation
SW2-4 SW2-5
On
On
Cycle with Blower
Off
Off
Cycle with Compressor
Off
On
Water Valve Slow Open
Off
On
Outdoor Air Damper
Aurora Timing Events
Normal Mode
Test Mode
Event
5 to 80 seconds
1 second
Random Start Delay
5 seconds
< 1 second
Compressor On Delay
2 minutes
5 seconds
Compressor Minimum On Time
4 minutes
15 seconds
Compressor Short Cycle Delay
30 seconds
2 seconds
Blower Off Delay
Less than 1 second Less than 1 second
Fault Recognition Delay – High Pressure
30 seconds
2 minutes
Start-Up Bypass – Low Pressure
30 seconds
30 seconds
Fault Recognition Delay – Low Pressure
2 minutes
30 seconds
Start-Up Bypass – Low Water/Air Coil Limit
30 seconds
30 seconds
Fault Recognition Delay – Low Water/Air Coil Limit
30 seconds
30 seconds
Fault Recognition Delay – Condensate Overflow
2 seconds
2 seconds
Thermostat Call Recognition Time
5 minutes
20 seconds
Auxiliary Heat Staging Delay
2 minutes
7.5 seconds
Emergency Heat Staging Delay
90 seconds
90 seconds
Water Valve Slow Open Delay
30 seconds
30 seconds
Reheat Delay
Aurora LED Flash Codes
1 second on and 1 second off
100 milliseconds on and 100 milliseconds off
100 milliseconds on and 400 milliseconds off with a 2 second pause before repeating
Random Start Delay
Fast Flash
Status LED (LED1, Green)
Fast Flash
Configuration LED (LED2, Yellow)
Fast Flash
Fault LED (LED3, Red)
Configuration LED (LED2, Yellow)
Fault LED (LED3, Red)
Status LED (LED1, Green)
No Software Overide
Flash ECM Setting Normal Mode
OFF
Normal Mode
ON
DIP Switch Overide
Slow Flash
Input Fault Lockout
Flash Code 1
OFF
Control is Non-Functional
Flash Code 2
Fast Flash
High Pressure Lockout
Test Mode
Slow Flash ECM Configure Mode
Flash Code 3
Off
Low Pressure Lockout
Fast Flash Reset Configure Mode
Lockout Active
Flash Code 4
Flash Code 2
Low Air Coil Limit Lockout - FP2
Dehumidification Mode
Flash Code 3
Low Water Coil Limit Lockout - FP1 Flash Code 5
Reserved
Flash Code 6
Reserved
Flash Code 4
Reserved
Flash Code 7
Flash Code 5
Condensate Overflow Lockout
Load Shed
Flash Code 8
Over/Under Voltage Shutdown
ESD
Flash Code 6
Flash Code 9
Flash Code 7
Reserved
Reserved
Flash Code 10
Reserved
Flash Code 11
Air/Water Coil Limit Sensor Error
Slow Flash
Fast Flash
Flash Code
Blower Settings
High
Low
LC*15
Yellow
White
LC*18
Blue
Yellow
6
7
Reheat/Normal
8
P3
Factory
CC – Dual/Single
L – Pulse/Continuous
Config
G
(+)
(-)
R
P8
Com2
P9
P7
C
P11
G
Acc – K6
G
(+)
(-)
R
C
RS 485
Factory Use
Com1
EH2
C
EH1
C
CO
N/A
P6
RS485 Exp
AURORA BASE
CONTROL™
Alarm – K5
CC
Factory Fan Connection
Y2
Y1
G
C
C
3A-Fuse
W
DH
DH
Y2
W
G
Y1
O/B
R
R
LO
ES
39
Field Connections
P1
O/B
Field Connections
P2
ALG
SW1 – Push button
SW2 – DIP package 8 position
PB – Power Block
RB – Blower Relay
RV – Reversing Valve Coil
LO
Y1
JW2 Alarm
C
C
Wire nut
CC – Compressor Contactor
CO – Condensate Overflow Sensor
ES – Emergency Shutdown
HP – High Pressure Switch
LP – Low Pressure Switch
FD – Freeze Detection Sensor
F1 – Fuse
5
F
ACC nc
Light Emitting Diode - Red
4
ACC – Dip 5
EH1
Y
SW2
Fan – K4
ACC c
R
ACC – Dip 4
LED2
CC Hi – K3
ACC no
Light Emitting Diode - Yellow
LS
Temperature Switch
Y
P5
ALM
Fuse
G
LO
HI
CCG
CC
FG
F
R
Factory
CC2
Polarized connector
Light Emitting Diode - Green
3
Status
CC – K2
Switch - Low pressure
1
Capacitor
G
Switch - High pressure
G
RV – B/O
LED3
SW1 Test
CC2
Ground
Relay Contacts – N.O., N.C.
2
Fault
Switch - Condensate Overflow
2
Field Wiring Lug
FP2 – 15oF/30oF
RV – K1
Relay Coil
3
L1
R
P13
Thermistor
T
On
1
C
Factory Low Voltage Wiring
Factory Line Voltage Wiring
Field Low Voltage Wiring
Field Line Voltage Wiring
Optional Block
DC Voltage PCB Traces
Field Zone Sensor Wiring
Internal Junction
Quick Connect Terminal
FP1 – 15oF/30oF
RS485 NET
Legend
P4
Off
LED1
ECM PWM
Factory
HP
HP
LP
LP
FP2
FP2
FP1
FP1
REV
REV
C
PWM
CFM
Notes:
1 – Swap blue and red leads for 208V operation.
2 – Use ALG Output for 24V lockout.
3 – Factory wired. Refer to blower table settings.
R
R
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Engineering Guide Specifications
Compressors shall be high-efficiency single speed rotary
type designed for heat pump duty and mounted on durometer
grommets to provide vibration free compressor mounting.
Compressor motors shall be single-phase PSC with external
overload protection.
General
Furnish and install GeoStar Water Source Heat Pumps, as
indicated on the plans. Equipment shall be completely assembled,
piped and internally wired. Chassis shall be installed with
factory built cabinet or other custom cabinet approved by the
manufacturer's engineering department. Chassis SHALL NOT be
installed without an approved cabinet enclosure. Capacities and
characteristics as listed in the schedule and the specifications
that follow. The reverse cycle heating/cooling units shall be floor
mounted console type with horizontal air inlet and up-flow air
discharge. Units shall be AHRI/ISO 13256-1 certified and listed
by a nationally recognized safety-testing laboratory or agency,
such as ETL Testing Laboratory. Each unit shall be computer
run-tested at the factory with conditioned water and operation
verified to catalog data. Each unit shall be mounted on a pallet and
shipped in a corrugated box or stretch-wrapped. The units shall be
designed to operate with entering liquid temperature between 20°F
and 120°F [-6.7°C and 48.9°C].
The air coil shall be sized for low-face velocity and constructed of
lanced aluminum fins bonded to rifled aluminum tubes in a staggered
pattern not less than three rows deep for enhanced performance.
Option: AlumiSeal electro-coated air coil.
The cabinet shall be fabricated from heavy-gauge galvanized steel
and finished with a beige textured epoxy powder coating on both
sides for added protection. This corrosion protection system shall
meet the stringent 1000 hour salt spray test per ASTM B117.
The coaxial water-to-refrigerant heat exchanger shall be designed
for low water pressure drop and constructed of a convoluted
copper (cupronickel option) inner tube and a steel outer tube.
Refrigerant to air heat exchangers shall utilize enhanced
corrugated lanced aluminum fins and rifled aluminum tube
construction rated to withstand 600 psig (4135 kPa) refrigerant
working pressure. Refrigerant-to-water heat exchangers shall
be of copper inner water tube and steel refrigerant outer tube
design, rated to withstand 600 psig (4135 kPa) working refrigerant
pressure and 450 psig (3101 kPa) working water pressure. The
thermostatic expansion valve shall provide proper superheat over
the entire liquid temperature range with minimal “hunting.” The
valve shall operate bi-directionally without the use of check valves.
The cabinet shall be easily removable to allow for ease of service
to the controls compartment, chassis, and piping. The top of the
cabinet and grille is a horizontally flat (optional sloped) surface with
a hinged control door cover. The return air filter shall be disposable
type media.
Option: Cupronickel refrigerant to water heat exchanger shall
be of copper-nickel inner water tube and steel refrigerant outer
tube design, rated to withstand 600 psig (4135 kPa) working
refrigerant pressure and 450 psig (3101 kPa) working water
pressure. Water lines shall also be of cupronickel construction.
The return and supply air sections are insulated with a 1/4 in.
(6.4 mm) thick, dual density, 2 lb/ft3 (32 kg/m3) coated mat glass
fiber with edges sealed or tucked under flanges to prevent the
introduction of glass fibers into the discharge supply air through
the aluminum grille. Standard cabinet panel insulation must meet
NFPA 90A requirements, air erosion and mold growth limits of UL181, stringent fungal resistance test per ASTM-C1071 and ASTM
G21, and shall meet zero level bacteria growth per ASTM G22.
Unit insulation must meet these stringent requirements or unit(s)
will not be accepted.
Option: ThermaShield coated water-to-refrigerant heat
exchanger, water lines and refrigerant suction lines shall be insulated
to prevent condensation at low liquid temperatures below 50°F.
Chassis and Cabinet
Blower Motor and Assembly
The blower shall be a direct drive centrifugal type with a dynamically
balanced wheel. The housing and wheel shall be designed for
quiet, low outlet velocity operation. The blower housing shall be
constructed of galvanized steel and shall be removable from the
unit for servicing of the blower motor. The blower motor shall be a
two-speed PSC or three-speed ECM type and shall be isolated from
the housing by rubber grommets. The motor shall be permanently
lubricated and have thermal overload protection.
Option: A Super Quiet Sound package shall include multidensity full coverage compressor blanket.
The drain pan shall be of stainless steel construction to inhibit
corrosion and bacterial growth. Drain outlet shall be located on pan
as to allow complete and unobstructed drainage of condensate.
The unit as standard will be supplied with solid-state electronic
condensate overflow protection with Aurora Base Control.
Mechanical float switches WILL NOT be accepted. Condensate
tube shall be constructed of stainless steel and have an internal
factory installed condensate trap.
Electrical
A control box shall be located within the unit compressor
compartment and shall contain a 50VA transformer, 24 Volt
activated, 2 pole compressor contactor, and solid-state controller
for complete unit operation. Units shall be name-plated for use with
time delay fuses or HACR circuit breakers. Unit controls shall be
24 Volt and provide heating or cooling as required by the remote
thermostat/sensor.
Refrigerant Circuit
Unit mounted controls shall consist of switches for “OFF”, “FAN”,
and “AUTO” or “HEAT/COOL”. An additional switch is provided
for blower speed setting of “HI” or “LO”. The unit shall be
equipped with a blower switch on the side of the control to provide
“CONTINUOUS” or “CYCLED” blower operation. “CYCLED”
blower will turn the blower on with the compressor. A unit-mounted
All units shall utilize the non-ozone depleting and low global
warming potential refrigerant R-410A. All units shall contain a
sealed refrigerant circuit including a hermetic motor-compressor,
bi-directional thermostatic expansion valve, finned tube air-torefrigerant heat exchanger, reversing valve, coaxial tube water-torefrigerant heat exchanger, and service ports.
40
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Engineering Guide Specifications cont.
electronic thermostat with a remote electronic thermistor located
in the return air will control compressor operation in heating and
cooling modes. Unit mounted thermostat shall be the standard
thermostat option. All unit mounted thermostats shall be auto
changeover. Manual changeover WILL NOT be accepted.
Electromechanical operation WILL NOT be accepted.
Hose Kits – Automatic Balancing and Ball Valves
(field-installed)
A flexible steel braid hose featuring Kevlar® reinforced EPDM
core with ANSI 302/304 stainless steel outer braid and fire rated
materials per ASTM E 84-00 (NFPA 255, ANSI/UL 723 & UBC
8-1). Ball valve at one end; swivel connector with adapter at the
other end (swivel to adapter connection via fiber or EPDM gasket).
Swivel connection provides union between heat pump and piping
system. The hoses feature brass fittings, stainless steel ferrules.
A full port ball valve shall be provided with integral P/T (pressure/
temperature) port on supply hose and automatic balancing valve
with integral P/T ports and full port ball valve on return hose.
Controls
Standard: A compressor control module (CCM) shall be included
to disable compressor operation in the event of a trip of any of the
safety switches and to send a signal to activate a fault indicator
light at the thermostat. The CCM shall be capable of being reset
from the thermostat or from the unit main disconnect switch. A
terminal block with screw terminals shall be provided for field
connection of all low-voltage wiring.
Specifications:
• Temperature range of 35°F [2°C] to 180°F [82°C].
• Max. working pressure of 400 psi [2757 kPa] for 1/2 in.
and 3/4 in. hose kits; max. working pressure of 350 psi
[2413 kPa] for 1 in. and 1-1/4 in. hose kits.
• Minimum burst pressure of four times working pressure.
An Aurora microprocessor-based controller that interfaces with
a multi-stage electronic thermostat to monitor and control unit
operation shall be provided. The control shall provide operational
sequencing, blower speed control, high and low pressure switch
monitoring, freeze detection, condensate overflow sensing, lockout
mode control, LED status and fault indicators, fault memory, field
selectable options and accessory output. The control shall provide
fault retry three times before locking out to limit nuisance trips.
Hose Kits – Automatic Balancing and Ball Valves with
‘Y’ strainer (field-installed)
A flexible steel braid hose featuring Kevlar® reinforced EPDM
core with ANSI 302/304 stainless steel outer braid and fire rated
materials per ASTM E 84-00 (NFPA 255, ANSI/UL 723 & UBC
8-1). Ball valve at one end; swivel connector with adapter at the
other end (swivel to adapter connection via fiber or EPDM gasket).
Swivel connection provides union between heat pump and piping
system. The hoses feature brass fittings, stainless steel ferrules. A
“y” strainer is provided on one end for fluid straining and
integral “blowdown” valve. A full port ball valve shall be provided
with integral P/T (pressure/temperature) port on supply hose and
automatic balancing valve with integral P/T ports and full port ball
valve on return hose.
A detachable terminal block with screw terminals will be provided
for field control wiring. All units shall have knockouts for entrance
of low and line voltage wiring. The blower motor and control box
shall be harness plug wired for easy removal.
Option: Remote mounted thermostat is available for CCM and
Aurora Base Control. A terminal block with screw terminals will be
provided for field control wiring.
Piping
Supply and return water connections shall be 1/2 in. [12.7 mm]
FPT copper threaded fittings. All water piping shall be insulated to
prevent condensation at low liquid temperatures.
Specifications:
• Temperature range of 35°F [2°C] to 180°F [82°C].
• Max. working pressure of 400 psi [2757 kPa] for 1/2 in.
and 3/4 in. hose kits; max. working pressure of 350 psi
[2413 kPa] for 1 in. and 1-1/4 in. hose kits.
• Minimum burst pressure of four times working pressure.
A stainless steel tube stubbed out from the chassis is provided for
condensate drain attachment. A short piece of polyvinyl hose is
supplied to assist in adapting to drain.
Accessories
Hose Kits – Ball Valves (field-installed)
A flexible steel braid hose featuring Kevlar® reinforced EPDM
core with ANSI 302/304 stainless steel outer braid and fire rated
materials per ASTM E 84-00 (NFPA 255, ANSI/UL 723 & UBC
8-1). Ball valve at one end; swivel connector with adapter at the
other end (swivel to adapter connection via fiber or EPDM gasket).
Swivel connection provides union between heat pump and piping
system. The hoses feature brass fittings, stainless steel ferrules.
A full port ball valve shall be provided with integral P/T (pressure/
temperature) port on supply hose. Specifications: Temperature
range of 35°F [2°C] to 180°F [82°C]. Max. working pressure of
400 psi [2757 kPa] for 1/2 in. and 3/4 in. hose kits; max. working
pressure of 350 psi [kPa] for 1 in. and 1-1/4 in. hose kits.
41
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Notes
42
ASTON LOW SILL SERIES SPECIFICATION CATALOG
Revision Guide
Pages:
Date:
By:
Released ABC Control Option
01 Sept 2015
MA
Updated Wiring Schematics
11 May 2015
MA
All
Updated with All-Aluminum Air Coils
10 Mar 2014
DS
All
First Published
11 Oct 2013
DS
All
36-37
Description:
43
Product:
Type:
Size:
Aston Low Sill Series
Geothermal/Water Source Heat Pumps
0.75-1.5 Ton
Document Type:
Part Number:
Release Date:
Specification Catalog
SC1012CGB
09/15
©2015 The manufacturer has a policy of continual product research and development and reserves the right to change design and specifications without notice.