Section 6 - W7459 Economizer Module
63-8594-02 Honeywell Economizers 56
W7459A, B, C and D
W7459A
W7459A or D - Uses inputs from mixed or
discharge air temperature sensors, C7150 or
C7046; enthalpy sensor C7400; and optional
remote minimum position potentiometer
Q709A or S963B. The W7459D is identical to
the W7459A except for the addition of a built-
in enthalpy high limit. Refer to high limit
function in Table 2 and at the end of this
section. Use both modules with M7415
motors.
There are four separate W7459 enthalpy logic
modules for use with various M74XX series
actuators. All provide enthalpy control of
mixed air. The W7459B is designed for use
with a legacy Honeywell direct digital
controller. The W7459C uses a SPST input for
the mixed air sensor.
W7459B
W7459B - Used with Honeywell W7401 Logic
Panel, enthalpy sensor C7400 or minimum
position potentiometer Q709A or S963B. Use
with M7405.
W7459C
W7459C - Uses input from SPST mixed or
discharge air control and enthalpy sensor
C7400. Used with M8405.
M23894A
ENTHALPY
CHANGEOVER
SETPOINT DIAL
LIGHT IS
ILLUMINATED IF
OUTDOOR AIR
IS USEABLE FOR
FREE COOLING
TR
TR1
A
BC
D
S
O
S
R
+
+
5
2
4
T1
P1
1
3
T
P
MINIMUM
POSITION
OPEN
NOTE: USE SMALL SCREWDRIVERS ON THE POTENTIOMETERS.
DO NOT USE EXCESSIVE FORCE!
MININUM
POSITION DIAL
(W7459A AND D
ONLY)
TRANSFORMER
(POWER) TERMINALS
OUTSIDE AIR
SENSOR TERMINALS
RETURN AIR
SENSOR TERMINALS
COOLING SWITCHING
CONTROLLED FROM
COOLING STAT
MIXED OR SUPPLY
AIR SENSOR
REMOTE MINIMUM
POSITION POTENTIOMETER
M23895A
TR
TR1
A
BC
D
S
O
S
R
+
+
3
1
M1
P1
M3
2
M2
P
MINIMUM
POSITION
OPEN
NOTE: USE SMALL SCREWDRIVERS ON THE POTENTIOMETERS.
DO NOT USE EXCESSIVE FORCE!
M23896A
TR
TR1
A
BC
D
S
O
S
R
+
+
2
4
X
D
1
3
6
5
MIXED AIR CONTROL
(T675/T6031)
CONNECTED TO
TERMINALS 6 AND D
NOTE: USE SMALL SCREWDRIVERS ON THE POTENTIOMETERS.
DO NOT USE EXCESSIVE FORCE!
X TERMINAL IS USED
WITH A ST6008 TIMER
FOR OCCUPIED/
UNOCCUPIED
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