Honeywell C7046C Product Data page 9

M8405
MAX
T
SW
APPLY
SET
24VAC T-X
MIN
FOR MIN POSN
T-D FOR
MAX POSN
X
D
Y1
Y2
W2
W1
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 ASSURE THAT EQUIPMENT TRANSFORMER IS SIZED FOR 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.
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY IF A C7400 ENTHALPY SENSOR
5
IS ADDED TO S R AND + FOR DIFFERENTIAL ENTHALPY.
Fig. 10. M8405A Damper Actuator used in two-stage cooling system with differential enthalpy
TR TR1
+
OUTDOOR
SO
SENSOR
S
C7400
SR
S
RETURN
SENSOR
+
1
C7400
UNOCCUPIED
3
S6005
TIMER
OCCUPIED
T675/T6031 MIXED
AIR CONTROL
6
55° F SETPOINT
W
R
W
T6031 AMBIENT
R
LOCKOUT CONTROL
50° F SETPOINT
changeover and W7459C Economizer.
9
SOLID STATE ECONOMIZER SYSTEM
W7459C ECONOMIZER PACKAGE
+
+
5
1K
4
2
2K
4
X
D
C
Y1
Y2
W2
W1
FDR
G
FDR
2
R
HVAC EQUIPMENT
TERMINAL STRIP
M8405 ACTUATOR
T
X
D
COOL 1
COOL 2
HEAT 2
HEAT 1
FAN
DELAY
RELAY
1 3
FAN
L2
L1
(HOT)
M3865A
63-2484—1