Contractor:
P.O.:
Engineer:
Project Name:
Unit Tag:
The manufacturer works continually to improve its products. As a result, the design and speci
fi
cations of each product at the time of order may be changed without notice. Purchaser’s approval of this data set signi
fi
es that the equipment is acceptable under the provisions
of the job speci
fi
cation. Statements and other information contained herein are not express warranties and do not form the basis of any bargain between the parties, but are merely the manufacturer’s opinion or commendation of its products. York and Af
fi
nity are registered
trademarks of Johnson Controls, Inc., and are used with permission.
Aurora Advanced with ECM and IntelliStart cont.
Wiring Schematics cont.
Communicating Thermostat
Dual Fuel Wiring Diagram
Using Field Installed Relay
24VDC
R from Fossil
Fuel Furnace
To Fossil Fuel
Furnace W input
EH1
C
ABC
Board
Note 11: Field installed SPST dual fuel relay
(Required for dual fuel installation)
Traditional Thermostat
Dual Fuel Wiring Diagram
Using Field Installed Relay
Y1
Y2
O
R
C
L
C
R
Fossil Fuel
Furnace
Thermostat
24 VAC
Common
Common
24 VAC
Fault Signal
Reversing Valve
2nd Stage Compressor
1st Stage Compressor
Y1
Y2
O
R
C
LO
ABC Board
G
G
Fan
W
W
Auxiliary Heat Relay
Note 11: Field installed SPST dual fuel relay
(Required for dual fuel installation)
Auxiliary Heat Relay
P2
P1
Auxiliary
Heat Relay
ES
= chassis
CC2
EH1
Factory
Fault
ALG
ALM
LS
ES
ACC c
Status
AURORA BASE
CONTROL™
RV – K1
CC2
CC – K2
CC Hi – K3
Fan – K4
Alarm – K5
Acc – K6
ACC no
ACC nc
O/B
C
R
LO
G
Y1
Y2
W
DH
3A-Fuse
O/B
C
R
LO
G
Y1
Y2
W
DH
LO
G
HI
CCG
CC
FG
F
R
HP
HP
LP
FP2
FP2
FP1
REV
REV
CFM
PWM
ECM PWM
Factory
Factory Fan Connection
R
R
CC
C
C
R
(-)
(+)
RS 485
EH2
C
EH1
C
CO
(+)
(-)
R
C
RS485 Exp
Factory
Com1
Com2
Config
G
G
G
Y
R
SW1 Test
FP1 – 15
o
F/30
o
F
JW2 - Alarm
P11
P5
P2
P1
P8
P7
P9
P6
P3
SW2
P13
P4
FP2 – 15
o
F/30
o
F
RV – B/O
ACC – Dip 4
ACC – Dip 5
CC – Dual/Single
L – Pulse/Continuous
Reheat/Normal
Factory Use
Field Connections
Field Connections
C
LP
FP1
F
CC
G
Y1
1
2
3
4
5
6
7
8
Off
On
N/A
RS485 NET
NO
COM
K6 Relay
Connects to L2
and NO on
AXB Board
L2
Figure 1:
Optional Internal
Hot Water
Generation Pump
Wiring Schematic
DHW
Pump
Blue
Blue
Cabinet
HW
Switch
3
2
1
Purple
VS
GND
24 VAC
0-10DC
1
2
3
R
C
ABC BOARD
AXB BOARD
MODULATING VALVE
1
2
Notes
3 – When Auxiliary Heat is field installed the harness will then be connected to
the auxiliary heat unit. The auxiliary heat unit will then power the blower. Refer to
EAS/EAM/EAL Auxiliary Heat kit installation instructions.
1 - Switch blue and red wires for 208V operation.
2 - The blk/wh and gray/wh wires are removed when Aux Heat is installed
9 - Wires provided for Auxiliary Heat low voltage control. Wires are secured at blower.
5 – Brown blower power wire routed through Current Transducer two times.
6 – Field Connected: Refer to Installation Manual and Auxiliary Heat Instructions for
Current Transducer installation.
7 – Variable speed pump low voltage harness provided with Variable Speed Flow Center.
4 – Low voltage wiring CLASS 2.
8 – Variable speed pump power wires to connect the pump to L1 and L2 on the AXB board
are provided with Variable Speed Flow Center.
Current Transducer (CT)
Thermistor
Light emitting diode - Green
Relay coil
Capacitor w/ bleed resistor
Switch - Condensate overflow
Switch - High pressure
Switch - Low pressure
Polarized connector
Factory Low voltage wiring
Factory Line voltage wiring
Field low voltage wiring
Field line voltage wiring
Optional block
DC Voltage PCB traces
Junction
Quick connect terminal
Wire nut
Field wire lug
Ground
Fuse
CC -
CO -
K5 -
K6 -
CR3 -
CR4 -
F1 and F2 -
WCL -
HE -
HP -
LP -
PB1, PB2 -
PS -
RV -
SW1 -
SW1 -
SW2 -
TS -
Compressor Contactor
Condensate overflow sensor
DHW pump relay
Loop pump relay
Fuses
Water Coil Limit Sensor
Heater element
High pressure switch
Low pressure switch
Power blocks
Power strip
Reversing Valve coil
DIP package 5 position AXB
TEST MODE ABC Board
DIP package 8 position ABC Board
Thermal limit switch
Legend
Relay Contacts-
N.O., N.C.
G
T
1
3
2
P
L1
PSC Fan Speed Relay
PSC Fan Power Relay
ER1 to ER4 -
Aux heat stage relays
HWL -
Hot water limit sensor
SC -
Start Contactor
Start Relay
SR -
CS -
Compressor Solenoid
Breaker
SD2500AG 05/21
53
Page _____ of _____
Aston Series
1 - 6 Tons 60Hz
