Water Furnace SAH Series Installation Manual page 22

SAH AIR HANDLER INSTALLATION MANUAL
Wiring Schematics cont.
SAH Air Handler Control Option C Schematic
208-230/60/1
L1 L2 G
Blue
L1 L2
PB1
Auxiliary Heat
Current Transducer
Black
Yellow
Blue
Black/White
Note:1
Transformer
Red
24V
CT
T
FP2 Sensor
Brown
Orange Leaving Air
T
Temperature LAT
ECM
Blower
Motor
Grn
4 3 2
1
Blue
Green/Yellow
Condensate
Overflow
Brown
Detail 'A'
ABC Control
Board in Split Unit
RS485 NET
+
C R -
ABC
P7
TO ABC
C R + -
PB2
Non-Communicating Thermostat will connect to the P1 connection on the ABC
board in the compressor section. A 4-conductor, 20AWG wire will need to connect
from the ABC P7 (See detail 'A' on schematic) connection to the TO ABC (C R + -)
power block (PB2) in the Air Handler.
LO
R
C
O
G
Y1
Y2
Non-Communicating
W
Thermostat
DH
FL1
HE1
TS1
Blue
RELAY R1
Yellow
Yellow
Grn/Yel
Black
Black
Gray
Status
Gray
G
AHB™
Brown
White
Green
Red
Black
1 – To operate in 208V mode replace the blue transformer
wire connected to PB1-L2 with red transformer wire.
LO
R
2 – Low voltage wiring CLASS 2.
C
O 3 – DIP switch 1 on SW1 must be set in the OFF
G
position.
Y1
Y2
W
DH
P1 ABC Board
Air Handler 5kW Electric Heat
Blue
1
White
2
3
PB4
Brown
Wires Not Used
Blue
Auxiliary Heat
Current Transducer
Black
Black
Brown
Brown
Blower Motor
Current Transducer
Communicating Thermostat will connect to the
COMM STAT (C R + -) power block PB3 in the air
handler. A 4-conductor, 20AWG wire will need to
NOTE:3
connect from the TO ABC (C R + -) power block
OFF ON
(PB2) in the Air Handler to the ABC P7(See detail
Modbus Add. ID 1
'A' on schematic) connection on the ABC board in
Future Use 2
the compressor section.
Future Use 3
Communicating Thermostat
4
Acc 2 – Dip 4
5
Acc 2 – Dip 5
SW1
PB3
White
Green
Red
Black
Notes:
22
Blo
MO
02
White
02
Blue
03
03
04
04
06
06
Facto
L-H s
"Aux
"G" m
CFM
Max
TO COMM STAT
C R + -
Legend
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
TS
Thermal Limit Switch
P
Field wire lug
L1
Ground
N.O., N.C.
97P903-02
G
Light emitting diode - Green
FL
Fused Limit
Breaker
1 2 3
Polarized connector
PB - Power block
SW1 -
DIP package 4 position
HE - Heater element