40
24Vac
TR
3
4
EF1EF
N1
N
EXH
OPEN
SR
ECONOMIZER IV
BOARD
BRN
ECONOMIZER MOTOR
RED
WHT
BLK
1
3
2
BLK
BLK
YEL
BLK
RED
OAT TEMP/
ENTHALPY SENSOR
Vac
24
+
-
SR+
AQ
SO+
SO
P
P1
T1
T
A
FREE
COOL
B
C
D
2V
DCV
SET
DCV
10V
2V
MAX
DCV
10V
POS
MIN
2V
SET
EXH
10V
AQ1
2
5
1
TR1
COM
HOT
6
IAQ
7
(FIELD
ACCESSORY)
REMOTE MIN
POSITION POT
FIELD INSTALLED
IAQ SENSOR
1
2
REMOTE POT (135 Ohm)
620k
(FIELD ACCESSORY)
ENTHALPY SENSOR
GRY
FIELD SPLICE
FIELD SPLICE
+
S
+
S
BLK
LALS
(NOT USED)
(NOT USED)
7
BLU
ORG
VIO
PNK
(NOT USED)
(NOT USED)
TAN
TO PWR EXHAUST
ACCESSORY
NOTES:
1. 620 OHM, 1 WATT 5% RESISTOR SHOULD BE REMOVED ONLY WHEN
USING DIFFERENTIAL ENTHALPY OR DRY BULB.
2. IF A SEPARATE FIELD SUPPLIED 24V TRANSFORMER IS USED FOR THE
IAQ SENSOR POWER SUPPLY, IT CANNOT HAVE THE SECONDARY OF THE
TRANSFORMER GROUNDED.
3. FOR FIELD INSTALLED REMOTE MINIMUM POSITION POT,
REMOVE BLACK WIRE JUMPER BETWEEN P AND P1 AND SET
CONTROL MINIMUM POSITION POT TO THE MINIMUM POSITION.
4. FOR VERTICAL ECONOMIZER THE ECONOMIZER MOTOR CONNECTIONS ARE
AS SHOWN.FOR HORIZONTAL ECONOMIZER THE ECONOMIZER MOTOR IS
ATTACHED TO THE ECONOMIZER IV BOARD, (THE WIRES SHOWN ARE NOT
UTILIZED --BLK, WHT & RED)
5. WHEN NOT USING A CO2 SENSOR, THE DCV MAX POTENTIOMETER MUST
BE COMPLETELY CLOSED (CCW) FOR THE MINIMUM POSITION
POTENTIOMETER TO FUNCTION CORRECTLY.
POTENTIOMETER DEFAULTS SETTINGS:
POWER EXHAUST MIDDLE
MINIMUM POS. 1/4 OPEN
DCV MAX. FULLY CLOSED
DCV SET MIDDLE
ENTHALPY C SETTING
PL6-R
FOR STD
UNIT
6
11
10
8
2
3
4
1
5
9
12
GRY
PINK
PINK
GRY
YEL
RED
BRN
BLK
REWGOY1Y2V
2-STAGE T-STAT
LOW
COM C
Y
IFB
BLU
BLU
SAT
YEL
WIRING FOR AC AND GAS/ELECTRIC MODELS
HPS
LPS
CC
BLK
BLU
BLK
BLU
BLOWER MOTOR
BLK SPEEDTAB
HIGH
RED
LEGEND
SPLICE
FACTORY WIRING
FIELD OR ACCESSORY CONTROL WIRING
C
48SD500120
C COMPRESSOR CONTACTOR
DVC DEMAND CONTROLLED VENTILATION
HPS HIGH PRESSURE SWITCH
IAQ INDOOR AIR QUALITY SENSORS
IFB INDOOR FAN BOARD
LALS LOW TEMPERATURE COMPRESSOR LOCKOUT SWITCH
LPS LOW PRESSURE SWITCH
OAT OUTDOOR AIR TEMPERATURE SENSOR
POT POTENTIOMETER
SAT SUPPLY AIR TEMPERATURE SENSOR
SEE NOTE 4
A10098
Fig. 40 -- Economizer Wiring Diagram
704D-- -- A
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