Water Furnace SAH Series Installation Manual page 21

Wiring Schematics cont.
SAH Air Handler Control Option C Schematic
L1
PB1
L2
Black Blue
Note:1
Transformer
Red
24V
CT
Brown
FP2 Sensor
Orange
Leaving Air
Temperature LAT
ECM
Blower
Motor
Grn
4 3 2
1
Green/Yellow
Condensate
Overflow
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
Unit Power
208-230/60/1
L1 L2
G
Grn/Yel
Yellow
Black/White
Black
T
Black
Gray
T
Gray
Blue
Brown
Brown
Green
White
Red
1 – To operate in 208V mode replace the blue transformer
wire connected to PB1-L2 with red transformer wire.
LO
R
C
2 – Low voltage wiring CLASS 2.
O
3 – DIP switch 1 on SW1 must be set in the OFF
G
position.
Y1
Y2
W
DH
P1 ABC Board
Status
G
AHB™
NOTE:3
OFF ON
Modbus Add. ID 1
Future Use 2
3
Future Use
4
Acc 2 – Dip 4
5
Acc 2 – Dip 5
SW1
Black
Notes:
21
SAH AIR HANDLER INSTALLATION MANUAL
Air Handler No Electric Heat
Blower Pe
MODEL
022
026
030
036
042
048
White
Not Used
White
060
Black
Accessory 2 Output
Black
066
Orange
Analog Output 0-10VDC
Orange
Factory settings
L-H settings MU
"Aux" is factory
"G" may be loca
CFM is controlle
Black
Not Used
Max ESP includ
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
connect from the TO ABC (C R + -) power block
(PB2) in the Air Handler to the ABC P7(See detail
'A' on schematic) connection on the ABC board in
the compressor section.
Communicating Thermostat
PB3
TO COMM STAT
C R + -
Green
White
Red
Black
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.
97P903-01
MAX
0
0
0
0
0
0
0
0
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