
W6215, W7215, W7460 ECONOMIZER LOGIC MODULES
17
63-2544—3
Fig. 16. W7460A used in single-stage cooling system with single enthalpy changeover and M7415 Motors.
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED. M7415 MOTOR MUST USE AN
INDEPENDENT TRANSFORMER.
ACTUATOR SPRING-RETURNS CLOSED WHEN FAN IS NOT RUNNING.
1S IS AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED
BY A 24 VAC INPUT.
M11805A
P1
P
T1
1
3
4
2
5
2K
S
1
2
3
4
TR
TR1
SO
SR
+
+
W7460A
+
1K
4
5
3
T
6
7
7
7
4
1S
1S1
C7150B MIXED
AIR OR
C7046A
DISCHARGE
AIR SENSOR
MINIMUM POSITION
ADJUSTMENT
MAXIMUM
POSITION
ADJUSTMENT
Q1
Q
AQ1
AQ
SD1
AC1
PG1
SD
AC
PG
FREE
COOL
UNIT
CONTROL
EXHAUST
FAN
INDOOR
FAN
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE
REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING
THERMOSTATS.
FOR T7300 ONLY.
FOR T7300, USE CONTACTS A1 AND A2 INSTEAD OF THE TIMER.
FOR TWO-STAGE THERMOSTATS ONLY.
+
–
2-10 VDC
INDOOR
AIR SENSOR
SHUT DOWN
PURGE
AIR CHANGE
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
UNOCCUPIED
ST6008
TIMER
L1
(HOT)
L2
FDR
FDR
FAN
HEAT 1
HEAT 2
COOL 1
HVAC EQUIPMENT
TERMINAL STRIP
T7300 OR T874
THERMOSTAT
1
C
G
W1
Y1
R
W2
RC
G
X
W1
Y1
Y2
W2
OCCUPIED
5
6
2
FAN
DELAY
RELAY
W
R
T6031 AMBIENT
LOCKOUT
CONTROL
50
°
F SETPOINT
M7415
OUT
+
–
L1
(HOT)
L2
1
P1
P
M7415
TR
TR1
RH
620 OHM
RESISTOR