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W6215, W7215, W7460 ECONOMIZER LOGIC MODULES
63-2544—3
16
Fig. 15. W7215B used with T775 Controller and Honeywell Series 72 Actuator.
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.
M11815A
P1
P
T1
1
3
4
2
5
2K
S
1
2
3
4
TR
TR1
SO
SR
+
+
W7215B
+
6
1K
4
5
T
6
7
5
1S
1S1
C7150B MIXED
AIR OR
C7046A
DISCHARGE
AIR SENSOR
620 OHM
RESISTOR
HONEYWELL
SERIES 72
ACTUATOR
(ML7275,
ML7285,
ML7295A,C
M7275,
M7285)
24 VAC HOT
24 VAC COM
FOR THE ML7295A,C, USE THE 4-20 mA MODEL ACTUATOR. THESE MODELS
HAVE 500 OHM INPUT IMPEDENCE THAT ALLOWS THE ACTUATOR TO ACCEPT
A 2-10 VDC SIGNAL.
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED
ONLY WHEN A C7400 ENTHALPY SENSOR IS ADDED TO SR AND + FOR
DIFFERENTIAL ENTHALPY.
T775 REQUIRES A MINIMUM OF THREE RELAY OUTPUTS: TWO FOR COOLING
AND ONE FOR FAN CONTROL. A MAXIMUM OF ONE STAGE HEATING IS
POSSIBLE WHEN THE SYSTEM IS WIRED IN THIS FASHION.
2-10V
OUT
+
+
–
–
L1
(HOT)
L2
FAN
COOL 1
HVAC EQUIPMENT
TERMINAL STRIP
1
2
G
Y1
R
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
UNOCCUPIED
OCCUPIED
ST6008
TIMER
3
COOL 2
Y2
W
R
T6031 AMBIENT
LOCKOUT
CONTROL
50
°
F SETPOINT
7
NO
COM
NC
NC
COM
NO
NC
COM
NO
T775 THERMOSTAT
C
MINIMUM POSITION
ADJUSTMENT
Q1
Q
AQ1
AQ
UNIT
CONTROL
EXHAUST
FAN
INDOOR
FAN
+
–
2-10 VDC
INDOOR
AIR SENSOR
+
–
2-10 VDC
OUTDOOR
AIR SENSOR
ALARM
FREE
COOL
SHUT DOWN
AIR CHANGE
SD
SD1
AC
AC1
OA
OA1
MAXIMUM
POSITION
ADJUSTMENT