50
BK
Y
BR
BK
FIELD SPLICE
TERMINAL (MARKED)
TERMINAL (UNMARKED)
SPLICE (IF USED)
SPLICE (MARKED)
FACTORY WIRING
FIELD CONTROL WIRING
FIELD POWER WIRING
ACCESSORY OR OPTIONAL
WIRING
C CONTACTOR
COMP COMPRESSOR MOTOR
CR COMBUSTION RELAY
EQUIP EQUIPMENT
FS FLAME SENSOR
GND GROUND
I IGNITOR
IGC INTERGRATED GAS UNIT CONTROLLER
IDM INDUCED DRAFT MOTOR
IFM INDOOR FAN MOTOR
LS1 PRIMARY LIMIT SWITCH
MGV MAIN GAS VALVE
OFM OUTDOOR FAN MOTOR
RS ROLLOUT SWITCH
TRAN TRANSFORMER
NOTES:
1. IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED,
THEY MUST BE REPLACED WITH THE SAME WIRE OR ITS EQUIVALENT.
2. SEE PRICE PAGES FOR THERMOSTATS.
3. USE 75 DEG. COPPER CONDUCTORS FOR FIELD INSTALLATION.
4. SEE INSTALLATION INSTRUCTIONS FOR PROPER HEATING AND COOLING
CONNECTIONS FOR YOUR UNIT. INDOOR FAN MOTOR PLUGS
- "DO NOT DISCONNECT UNDER LOAD"
5. THIS FUSE IS MANUFACTURED BY LITTELFUSE, P/N 257003.
6. THIS FUSE IS MANUFACTURED BY LITTELFUSE, P/N 257005.
7. INDUCER CAPACITOR AND WIRING ON CERTAIN MODELS ONLY.
IF CAP2 IS PRESENT, YELLOW WIRES FROM IGC AND IDM CONNECT
ON SAME SIDE OF CAP2.
8. REMOVE YELLOW SPLICE WIRE WHEN ECONOMIZER AND ECONOMIZER
RELAYS ARE USED AND CONNECT TO RELAY R1 AS SHOWN.
9. WHEN ECONOMIZER AND ECONOMIZER RELAYS ARE USED,
CONNECT THE YELLOW AND BLACK WIRES TO RELAY R AS SHOWN. RELAY
KIT REQUIRED WITH ECONOMIZER AND HEAT PUMP/DUAL FUEL UNITS.
10. WHEN ECONOMIZER AND ECONOMIZER RELAYS ARE USED,
INSTALL WIRES AS SHOWN ONTO THE COILS OF RELAY R AND RELAY R1.
11. DEHUMIDIFICATION FEATURE CANNOT BE USED WHEN ECONOMIZER IS
INSTALLED.
CAP 1 CAPACITOR, COMP
CAP 2 CAPACITOR, INDUCER
PRS PRESSURE SWITCH
IFB INDOOR FAN BOARD
LGPS LOW GAS PRESSURE SWITCH (WHEN USED)
CCH CRANK CASE HEATER
LPS LOW PRESSURE SWITCH
HPS HIGH PRESSURE SWITCH
T-STAT THERMOSTAT
DB DEFROST BOARD
RVS REVERSING VALVE
DFT DEFROST TEMPERATURE
SWITCH
DR DEFROST BOARD RELAY
LS2 SECONDARY LIMIT SWITCH
R ECON RELAY
R1 ECON RELAY
DH DEHUMIDIFICATION MODE
ECON ECONOMIZER
SAT SUPPLY AIR TEMPERATURE
FIELD
SUPPLY
C F
SCHEMATIC
208/230-3-60
1
1
EQUIP_GND
C
C1
C2
IDM
V
Y
BR
G/Y
CAP 3
QT
COMP
T1
T2
T3
L2
L2
L2
L1
C
J2
W
IFO
5AMP
G
R
RS
RS
LS
LS
CS
CS
GV
GV
C
IGC
CM
BM
FS
RT
Y
BR
FS
LS1
1
3
RS
1
3
LS2
1
3
R
PRIMARY
208/230V
TRAN
SECONDARY
24 V
24V
C
230
COM
MGV
M
C
OFM
CAP1
Y
BR
C
11
21
13
23
Y
BL
COMPRESSOR PLUG
Y
BL
BL
V
V
GY
BR
G/Y
BR
BL
CCH
G
BK
Y
O
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
CONNECTION WIRING DIAGRAM
Y
R
G
W
Y1
R
G
W
T-STAT
COLOR CODE
BK BLACK
BL BLUE
BR BROWN
GY GRAY
G GREEN
O ORANGE
P PINK
R RED
V VIOLET
W WHITE
Y YELLOW
BR
C
Y
HIGH
LOW
COM
C
C
FUSE
COM
3A
IFB
IFM
G
N
L
C
1 2
4
3
5
Y
BR
R
BR
R
G/Y
O
BK
BL
LPS
P
RVS
DFT
DIP SWITCH SETTINGS
30 MINUTES
60 MINUTES
ON
90
DEFAULT
90 MINUTES
OR
OFF
SHIFT
(DEFAULT)
QUIET
OR
OR
60
FIELD SELECTABLE OPTIONS FOR
TIME PERIOD BETWEEN DEFROST
CYCLES (MINUTES)
1) MOMENTARILY SHORT PINS AND RELEASE TO BYPASS
COMPRESSOR OFF DELAY.
2) SHORT FOR 5+ SEC. AND RELEASE FOR FORCED DEFROST.
3) PERMANENT SHORT WILL BE IGNORED.
DEFROST WILL TERMINATE IN 30 SEC. IF DFT OPEN.
DEFROST WILL TERMINATE NORMALLY IF DFT IS CLOSED.
SPEED
UP
JUMPERED TEST PINS (USE METAL OBJECT)
FIELD SPEED-UP CYCLE
1
1
1
1
1
3
3
3
3
3
2
2
2
2
2
30
60
30
120
90
UP
SPEED
P1
P3
P2
CTD
DEFROST BOARD (DB)
DR
OF2
OF1
0
W2
R
Y
DFT
T2
T1
O
R
Y
C
C
C
BK
BR
BR
P
IF USED
DR
OF1 OF2
G
4
6
W
Y1/Y
R
C
3
2
1
P1
3
C
X 5
W
4
R
24V
P2
1
2
Y
BR
BR
BR
R
Y
O
BR
R
R
BK Y
W
R
GY
Y
GY
W
R
INDOOR BLOWER
24V CONNECTIONS
SEE NOTE 4
SEE NOTE 4
5
BK
R
BL
P
O
R
FUSE
120 MINUTES
BK
BK
BK
BK
BK
BK
BK
BK
BK
BL
BK
SAT
BL
BL
ECON
R
1
2
3
R
BR
Y
GY
GROUNDED
THRU STANDOFF
CR
BL
GVR
I
R1
1
2
3
Y
Y2
Y
BK
Y
Y
BK
R1
C1
C2
R
C1
C2
SEE NOTE 6
SEE NOTE 5
GAS
HEAT
SEE
NOTE 7
BL
DH
Y2/DH
SEE NOTE 10
SEE NOTE 8
SEE NOTE 9
SEE NOTE 11
PRS
O
Y
O
LGPS (WHEN USED)
GY
W
BR
R
BR
R
BR
BR
O
W
Y
Y
BR
R
W
W
GY
HPS
BK
BL
P
P
DB
THE COMPRESSOR WILL SHUT OFF FOR
30 SEC. ON DEFROST INITIATION AND
TERMINATION IN THE "QUIET SHIFT"
ON POSITION.
7
6
11
10
8
2
3
4
1
5
9
12
ECONOMIZER PLUG
7
6
11
10
8
2
3
4
1
5
9
12
SEE 50SD500625 ECONOMIZER LABEL DIAGRAM
BK
O
A10075C
Fig. 50 -- Connection Wiring Diagram 230--3
674D
--
--
A
Summary of Contents for Legacy 674D
Page 3: ...3 A09473 Fig 2 674D A24 36 Unit Dimensions 674D A...
Page 4: ...4 A09474 Fig 3 674D A42 60 Unit Dimensions 674D A...
Page 24: ...24 A10207C Fig 14 208 230 1 60 Connection Wiring Diagram Unit 674D 674D A...
Page 25: ...25 A10207L Fig 14 Cont 208 230 1 60 Ladder Wiring Diagram Unit 674D A 674D A...
Page 26: ...26 A10208C Fig 15 208 230 3 60 Connection Wiring Diagram Unit 674D A 674D A...
Page 27: ...27 A10208L Fig 15 Cont 208 230 3 60 Ladder Wiring Diagram Unit 674D A 674D A...
Page 28: ...28 A08019 Fig 16 Cooling Charging Table Subcooling 674D A...
Page 49: ...49 A10059 Fig 49 Economizer Wiring Diagram 674D A...
