Honeywell Design and Application Technical Reference Manual page 85

HONEYWELL
SERIES 72
24 VAC COM
ACTUATOR
(MS7503 OR
MS7505)
+
+
2-10V
OUT
–
–
5
Y1
Y2
W2
W1
G
RH
RC
6
X
T7300 OR T874
THERMOSTAT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 ACTUATOR SPRING-RETURNS CLOSED WHEN FAN IS NOT RUNNING.
3 ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA
LOAD OF THE ECONOMIZER AND ACTUATOR.
4 1S IS AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED
BY A 24 VAC INPUT.
W7215A used in two-stage cooling system with Honeywell Series 72 Actuator
W7215A
24 VAC HOT
TR
S O
S R
1K
1
1S
4
2K
T
1S1
P
MINIMUM POSITION
ADJUSTMENT
FREE Q
COOL MAXIMUM
POSITION
AQ
ADJUSTMENT
UNIT
SD
CONTROL
EXHAUST AC
FAN
INDOOR
PG
FAN
Section 8 - W6215, W7215 And W7460 Economizer Modules
TR1
+
620 OHM
+
RESISTOR
5
5
2
4
3
C7150B
MIXED AIR
OR C7046A
T1
DISCHARGE
AIR SENSOR
P1
T6031 AMBIENT
LOCKOUT
CONTROL
Q1
50 F SETPOINT
–
2-10 VDC
AQ1
INDOOR
+
AIR SENSOR
SD1
SHUT DOWN
AC1
AIR CHANGE
PG1
PURGE
C
Y1
Y2
W2
W1
FDR
G
FDR
R
HVAC EQUIPMENT
TERMINAL STRIP
5 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.
6
FOR T7300 ONLY.
7 FOR T7300, USE CONTACTS A1 AND A2 INSTEAD OF THE TIMER.
79
C7400
+
OUTDOOR
AIR
S
ENTHALPY
SENSOR
W
R
UNOCCUPIED
ST6008
TIMER
OCCUPIED
COOL 1
COOL 2
HEAT 2
HEAT 1
FAN
DELAY
RELAY
FAN
3
L2
2
L1
(HOT)
Honeywell Economizers 63-8594-02
7
1
M11801B