L1
(HOT)
L2
FDR
FDR
FAN
FAN
DELAY
RELAY
HEAT 1
HEAT 2
COOL 1
HVAC EQUIPMENT
TERMINAL STRIP
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
ACTUATOR 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 THAT 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 WHEN A C7400 ENTHALPY SENSOR
IS ADDED TO S
R
AND + FOR DIFFERENTIAL ENTHALPY.
FOR T7300 ONLY.
FOR T7300, USE CONTACTS A1 AND A2 INSTEAD OF THE TIMER.
FOR THE ML7295A,C USE THE 4-20 MA MODEL ACTUATOR. THESE MODELS HAVE 500 OHM INPUT IMPEDENCE,
WHICH ALLOWS THE ACTUATOR TO ACCEPT A 2-10 VDC SIGNAL.
M1115 4B
T7300 OR T874
THERMOSTAT
P1
P
T1
1
3
4
2
5
2K
S
1
1
2
3
4
6
8
7
TR TR1
S
O
S
R
+
+
W7210A,D
+
C
G
W1
Y1
R
W2
RC
G
X
W1
Y1
Y2
W2
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
UNOCCUPIED
OCCUPIED
ST6008
TIMER
3
2
5
1K
COOL 2
Y2
4
5
T
6
7
8
1S
1S1
C7150B MIXED
AIR OR
C7046A
DISCHARGE
AIR SENSOR
620 OHM
RESISTOR
W
R
T6031 AMBIENT
LOCKOUT
CONTROL
50 F SETPOINT
RH
MINIMUM POSITION
ADJUSTMENT
9
9
+
–
2-10V
OUT
24 VAC HOT
24 VAC COM
HONEYWELL
SERIES 72
ACTUATOR
(ML7275,
ML7285,
ML7295A,C
M7275,
M7285)
+
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