Water Furnace SAH Series Installation Manual page 24

SAH AIR HANDLER INSTALLATION MANUAL
Wiring Schematics cont.
SAH Air Handler Control Option C Schematic
Yellow
Note:2
Black
L1
PB1
L2
Black Blue
Yellow
Black/White
Note:1
Transformer
Red
24V
Brown
Black
T
FP2 Sensor
Black
CT
Orange
Leaving Air Gray
T
Temperature LAT
Gray
ECM
Blower
Motor
Grn
4 3
2 1
Blue
Green/Yellow
Brown
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
Blue
Red
Black
HE3
FL3
Black FL1
HE1
HE2
FL2
Yellow
TS2
Blue
RELAY R1
Yellow
Blue
Brown
H H
5 3 5 3
4 1 H 4 1 H
SEQ2 SEQ1
Blue
Blue
Red
Auxiliary Heat
Current Transducer
Black
Blue
Yellow
Grn/Yel
Red
Status
G
AHB™
Modbus Add. ID
Future Use
Future Use
Acc 2 – Dip 4
Acc 2 – Dip 5
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 – Use manufacturer's part number 19P592-01
C
O (jumper bar assembly) when single source power is
G
required.
Y1
3 – Low voltage wiring CLASS 2.
Y2
W 4 – DIP switch 1 on SW1 must be set in the OFF
DH
position.
P1 ABC Board
Air Handler 15kW Electric Heat
TS1
Yellow
Brown
1
White
2
3
Blue
PB4
White
Brown
Blue
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:4
connect from the TO ABC (C R + -) power block
(PB2) in the Air Handler to the ABC P7(See detail
OFF ON
'A' on schematic) connection on the ABC board in
1
the compressor section.
2
Communicating Thermostat
3
4
5
SW1
PB3 TO COMM STAT
White
Green
Red
Black
Notes:
24
Air H
Blowe
MODEL
022
026
030
036
Dual Power Supply Connections
042
If two separate circuits are used to supply power to the
auxiliary heat kit, the Installer will need to verify that each leg of
048
the auxiliary heat circuit breakers are wired from the power
supply correctly in order for the electric heat kit to operate
060
properly. This can be done by measuring the supply side
voltage of the auxiliary heat circuit breakers. Put a voltmeter on
066
the L2 side of Circuit Breaker One and on the L2 side of Circuit
Breaker Two. The voltmeter should read approximately 0 volts.
Factory s
If the meter reads high voltage, the auxiliary heat breakers
L-H settin
need to be rewired so that breakers in the auxiliary heat kit
"Aux" is f
match the wiring of the Disconnect Panel breakers. Meaning,
"G" may b
L1 and L2 from one breaker in the disconnect panel must
CFM is co
connect to L1 and L2 at one of the auxiliary heat circuit Max ESP
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.
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
Field wire lug
L1
Ground
N.O., N.C.
97P903-04
G Light emitting diode - Green
FL
Fused Limit
Breaker
1 2 3
P Polarized connector
PB - Power block
SW1 -
DIP package 4 position
HE - Heater element