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Fig. 24—T7200A with 1-stage cooling system with differential enthalpy changeover using W7459A/C7400 with
M7415 Actuator.
OUTDOOR
AIR ENTHALPY
SENSOR
C7400
RETURN AIR
ENTHALPY
SENSOR
C7400
C7150B MIXED
OR DISCHARGE
AIR SENSOR
X
Y1
W1
G
RH
6
RC
T7200A
WALLPLATE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 24 VAC SECONDARY.
2
ASSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER, ACTUATOR,
T7200 AND WALLPLATE
3
AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED BY A 24 VAC INPUT.
4
RELAYS 1K AND 2K 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 A C7400 ENTHALPY SENSOR IS
ADDED TO SR AND + FOR DIFFERENTIAL ENTHALPY.
6
FIELD INSTALLED JUMPER.
W7459A ECONOMIZER PACKAGE
TR
TR1
+
+
SO
S
+
SR
+
5
5
S
1K
2
1
2K
3
4
T
T1
P
P1
C
W
Y1
T6301 AMBIENT
R
LOCKOUT CONTROL
Y2
o
50
F SETPOINT
W1
G
R
HVAC EQUIPMENT
TERMINAL STRIP
23
4
18
3
1S1
MINIMUM POSITION
ADJUSTMENT
COOL 1
HEAT 1
FAN
T7200/T7300/Q7300
WIRING DIAGRAMS
M7415 ACTUATOR
TR
TR1
T
T1
P1
P
L1
(HOT)
L2
1
2
M4407
63-4038—7
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