Honeywell Design and Application User Manual

Section 6 - W7459 Economizer Module
61 Honeywell Economizers 63-8594-02
W7459A/C7400 or W7459D/C7400 used in two-stage cooling system with
single enthalpy changeover, M7415 Actuator, and T775 Series 2000 Controller
L1
(HOT)
L2
FAN
COOL 1
HVAC EQUIPMENT
TERMINAL STRIP
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
MOTOR SPRING-RETURNS CLOSED WHEN FAN IS NOT RUNNING.
ENSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.
1S IS AN ELECTRONIC SWITCH, WHICH CLOSES WHEN POWERED BY A 24 VAC INPUT.
RELAYS 1K AND 2K ACTUATE WHEN THE ENTHALPY SENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A-D.
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY IF A C7400 ENTHALPY SENSOR
IS ADDED TO S
R
AND + FOR DIFFERENTIAL ENTHALPY.
T775 REQUIRES A MINIMUM OF THREE RELAY OUTPUTS: TWO FOR COOLING AND ONE FOR FAN CONTROL.
T775 SERIES 2000 CAN BE PROGRAMMED TO PROVIDE TIME OF DAY CLOCK AND THE ST6008 TIMER CAN BE ELIMINATED.
M13843B
T1
P1
P1
P
T1
1
3
4
2
5
2K
S
1
1
2
3
4
6
TR TR1
S
O
S
R
+
+
TR
M7415 ACTUATORW7459A ECONOMIZER PACKAGE
+
C
G
Y1
R
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
3
2
5
1K
COOL 2
Y2
4
5
T
6
7
7
P
T
1S
1S1
MINIMUM POSITION
ADJUSTMENT
TR1
MINIMUM
POSITION
MIXED
AIR
SENSOR
24 VAC
C7150B MIXED
AIR OR
C7046A
DISCHARGE
AIR SENSOR
M7415
TR
TR1
T1
P1
P
24 VAC
SENSOR
MIN
POS
T
620 OHM
RESISTOR
W
R
T6031 AMBIENT
LOCKOUT
CONTROL
50 F SETPOINT
T775 CONTROLLER
UNOCCUPIED
OCCUPIED
ST6008
TIMER
C
NO
NC
C
NO
NC
C
NC
NO
C
NC
NO
C
+
8
8

Honeywell Design and Application Specifications

General

Brand	Honeywell
Model	Design and Application
Category	Controller
Language	English