Honeywell C7150B Product Data page 20

SOLID STATE ECONOMIZER SYSTEM
M8405
MAX
T
SW
APPLY
SET
24VAC T-X
MIN
FOR MIN POSN
T-D FOR
MAX POSN
X
D
6
Fig. 27. M8405A Damper Actuator used in two-stage cooling system with differential enthalpy changeover and W7459C
63-2484—2
C7400
+
OUTDOOR
SENSOR
S
C7400
S
RETURN
SENSOR
+
UNOCCUPIED
ST6008
TIMER
OCCUPIED
T675/T6031 MIXED
AIR CONTROL
55¡ F SETPOINT
W
R
Y1
W
T6031 AMBIENT
Y2 R
LOCKOUT CONTROL
50¡ F SETPOINT
W2
W1
X
G
RH
RC
T7300 OR T874
THERMOSTAT
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
RELAYS 1K AND 2K ACTUATE WHEN THE ENTHALPY SENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A-D.
5
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.
6
FOR T7300 ONLY.
W7459C ECONOMIZER PACKAGE
TR TR1
+
S O
+
S R
5
5
1K
4
1
2
2K
3 4
X
6 D
C
Y1
Y2
W2
W1
FDR
G
FDR
R
HVAC EQUIPMENT
TERMINAL STRIP
Economizer.
20
M8405 ACTUATOR
T
X
D
COOL 1
COOL 2
HEAT 2
HEAT 1
FAN
DELAY
RELAY
1 3
FAN
L2
2
L1
(HOT)
M3865B