16
Wiring Schematics
Air Handler Wiring Schematic - 208-230/60/1
97P787-02
Air Handler No Electric Heat
Thermostat
R
C
Y1
O
W
Y2
Transformer
G
ECM
Blower
Motor
Grn
On/Off
BK
RPM
C2
RPM grnd
2
3
4
5
1
Blk/Wh
Yel
24V
C1
EM / W2
ADJUST
DELAY
COOL
Y /Y2
R
Y1
O
W / W1
HEAT
L2
L1
PB
Orange
Brown
P4
XFRM
SEC
C
11
12
16
8
1
7
6
13
9
10
15
3
5
4
2
14
R
Y1
Y2
On
SW1
1
2
3
4
5
6
7
8
9
10
O/B
G
W1
ODD
W2
C
R
LED
W1
W2
Black
Blue
Red
NOTE 1
11
12
16
8
1
7
10
3
5
4
6
13
9
15
2
14
G
Grn/Yel(1)
Note 3
P3
13
Black (13)
Black (2)
Black (9)
Black (15)
Black (14)
Black (6)
Black (10)
Black (4)
Black (11)
Black (7)
Black (5)
Black (12)
Black (16)
Black (1)
Black (3)
Black (8)
208-230/60/1
Notes:
1 – To operate in 208V mode replace the blue transformer
wire connected to PB-L2 with red transformer wire.
2 – Jumper wires are Factory Installed, and are needed for
electric heat operation.
3 – Dip switches are used to select the air flow.
4 – Use manufacturer’s part number 19P592-01
(jumper bar assembly) when single source power is
required.
5 – Low voltage wiring CLASS 2.
Light emitting diode - Green
208-230V Relay coil
Electric Heat Contactor
Polarized connector
Factory Low voltage wiring
Factory Line voltage wiring
Field low voltage wiring
Field line voltage wiring
Optional block
DC Voltage PCB traces
Internal junction
Quick connect terminal
Thermal Limit Switch
Field wire lug
Ground
HE -
PB -
SW1 -
Heater element
Power block
DIP package 10 position
Legend
N.O., N.C.
G
L1
ER1 to ER4 - Aux heat stage relays
1 2 3
P
EHC
EHC
Breaker
TS
If two separate circuits are used to supply power to the
auxiliary heat kit, the Installer will need to verify that each leg of
the auxiliary heat circuit breakers are wired from the power
supply correctly in order for the electric heat kit to operate
properly. This can be done by measuring the supply side
voltage of the auxiliary heat circuit breakers. Put a voltmeter on
the L2 side of Circuit Breaker One and on the L2 side of Circuit
Breaker Two. The voltmeter should read approximately 0 volts.
If the meter reads high voltage, the auxiliary heat breakers
need to be rewired so that breakers in the auxiliary heat kit
match the wiring of the Disconnect Panel breakers. Meaning,
L1 and L2 from one breaker in the disconnect panel must
connect to L1 and L2 at one of the auxiliary heat circuit
breakers and L1 and L2 from the other breaker in the
disconnect panel must connect to L1 and L2 of the other
auxiliary heat circuit breaker, making sure that the L1 and L2
from each disconnect breaker matches the L1 and L2 at each
of the auxiliary heat breakers.
Dual Power Supply Connections
ASTON SERIES AIR HANDLER INSTALLATION MANUAL
