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Fig. 33—T7300/Q7300G defeating economizer minimum position during unoccupied period in 3-stage cool
system with single enthalpy changeover using W7459A/C7400 with M7415 Actuator.
ENTHALPY
SENSOR
C7400
5
C7150B MIXED
OR DISCHARGE
AIR SENSOR
A1
A2
X
Y1
W
R
Y2
Y3
W1
G
RH
6
RC
T7300/Q7300
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTIONS AS REQUIRED. 24 VAC SECONDARY.
2
ASSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER, ACTUATOR AND T7300/Q7300.
3
1S, AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED BY A 24 VAC INPUT.
4
RELAYS 1K AND 3K ACTUATE WHEN THE ENTHALPY SENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A-D.
5
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY IF C7400 ENTHALPY SENSOR IS ADDED
TO SR AND + FOR DIFFERENTIAL ENTHALPY.
6
FIELD INSTALLED JUMPER.
TR1
TR
+
+
SO
S
+
SR
620 OHM
RESISTOR
5
2
1
3
4
T
T1
P
P1
3K
3K1
3K2
T6301 AMBIENT
LOCKOUT
CONTROL
o
60
F SETPOINT
HVAC EQUIPMENT
TERMINAL STRIP
31
W7459A ECONOMIZER PACKAGE
1K
4
18
2K
3
1S1
MINIMUM POSITION
ADJUSTMENT
C
COOL 1
Y1
COOL 2
Y2
Y3
COOL 3
W1
HEAT 1
FAN
G
R
T7200/T7300/Q7300
WIRING DIAGRAMS
M7415 ACTUATOR
TR
TR1
T
T1
P1
P
TR
24 VAC
TR1
T1
SENSOR
T
P1
MIN
POS
P
M7415
L1
(HOT)
L2
1
2
M4395
63-4038—7
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