Water Furnace SAH Series Installation Manual page 20

SAH AIR HANDLER INSTALLATION MANUAL
Wiring Schematics cont.
SAH Air Handler Control Option A Schematic
NOTE 2
Thermostat
R
C
Y1
Y2
W
O
G
L1
Notes:
1 – To operate in 208V mode replace the blue transformer
wire connected to PB-L2 with red transformer wire.
2 – Use manufacturer's part number 19P592-01
(jumper bar assembly) when single source power is
required.
3 – Low voltage wiring CLASS 2.
Legend
Factory Low voltage wiring
G
Factory Line voltage wiring
Field low voltage wiring
Field line voltage wiring
EHC
Optional block
DC Voltage PCB traces
Internal junction
EHC
Quick connect terminal
1 2 3
TS
Thermal Limit Switch
P
Field wire lug
L1
PB -
Ground
N.O., N.C.
HE -
ER1 to ER4 - Aux heat stage relays
Red
Red
Black
HE3
FL3
HE2
FL2
Yellow
TS2
Yellow
Blue
RELAY R2
Blue
Black
Blue
Brown
H
5 3
1 H
4
SEQ2
Blue
Red
Red
Black
Black
Blue
Blue
Black
Black
Black
Transformer L1 L2
Black PB
24V
Red NOTE 1
Blue
Black
Yellow
Blk/Wh
Grn/Yel
TB
Red
R
Blue
C
Y1
Tan
Y2
W1
O
G
L
S
X1
If two separate circuits are used to supply power to the
X2 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
Light emitting diode - Green
need to be rewired so that breakers in the auxiliary heat kit
208-230V Relay coil
match the wiring of the Disconnect Panel breakers. Meaning,
L1 and L2 from one breaker in the disconnect panel must
Electric Heat Contactor
connect to L1 and L2 at one of the auxiliary heat circuit
breakers and L1 and L2 from the other breaker in the
Polarized connector
disconnect panel must connect to L1 and L2 of the other
auxiliary heat circuit breaker, making sure that the L1 and L2
Power block
from each disconnect breaker matches the L1 and L2 at each
of the auxiliary heat breakers.
Heater element
Breaker
Black
Air Handler 20kW Electric Heat
Black
FL4 HE4
FL1
HE1 Yellow
TS1
Yellow
Brown
Blue
RELAY R1
White
White
H
5 3
Blue
1 H
4
SEQ1
Red
Brown
C
5 Speed
1 ECM
Blower
2
Motor
3
4
5
L N G
Grey
Dual Power Supply Connections
20
1
Orange
2
3
Orange
Blue
White
97P901-05