Honeywell Design and Application Technical Reference Manual page 67

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