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INSTALLER'S GUIDE
A 1. Disconnect power at TR and TR1.
2. Disconnect jumper P to P1.
3. Jumper TR to 1.
4. Jumper T1 to T.
5. If connected, remove C7400 Solid State Enthalpy Sensor
from teminals S0 and +. Ensure factory-installed 620 ohm
resistor is connected to terminals Sr and +.
6. Apply power (24Vac) to terminals TR and TR1
B 1. Disconnect factory-installed 620 ohm resistor from
terminals Sr and +.
C 1. To simulate high and low enthalpy (single enthalpy
sensor) reconnect factory-installed 620 ohm resistor from
termonals Sr and +. Connect 1.2K ohm 4074EJM Checkout
Resistor across terminals So and +.
2. Turn enthalpy setpoint potentiometer to "A".
3. Turn enthalpy setpoint potentiometer to "D".
4. Disconnect the 1.2 K ohm checkout resistor.
D 1. To verify sensor operation, reconnect the + lead of the
outdoor enthalpy sensor to the + terminal of W7459.
2 Connect a DC millimeter between terminal So of the
W7459A and terminal S of the enthalpy sensor. See Fig. 10
(positive meter lead to terminal S of the enthalpy sensor).
3. When using differential enthalpy, check the return air
enthalpy sensor by connecting a DC millimeter between
terminal Sr of the W7459A and terminal S of the return air
enthalpy sensor. (positve meter lead to terminal S of the
enthalpy sensor).
Location of Enthalpy Set Point, Minimum Position
and LED
1
MINIMUM DAMPER POSITION ADJUSTMENT
IS PRESENT ONLY ON W7459A,D MODELS.
Trane
6200 Troup Highway
© 2008 Trane All rights reserved
Tyler, TX 75707-9010
Page 8
Table 2. Enthalpy Checkout Procedure
Checkout Procedure
ENTHALPY
CHANGEOVER
SETPOINT
MINIMUM
DAMPER
POSITION
1
SETTING
LED LIGHTS
WHEN OUTDOOR
AIR IS SUITABLE
FOR FREE COOLING
M9098B
Figure 8. Enthalpy LEDs and Checkout
Response
LED is off.
Motor is in closed position.
Led turns on, motor drives toward open.
__
LED turns on, indicating low enthalpy.
Motor drives toward open.
LED turns off, indicating high enthalpy.
Motor drives toward closed.
__
__
Millimeter indication is between 3 and 25
mA if sensor is operating properly.
If millimeter indicates zero, the sensor may
be wired backward.
Millimeter indication is between 3 and 25
mA if sensor is operating properly.
If millimeter indicates zero, the sensor may
be wired backward.
Meter Location for Checkout and Trouble-
shooting
W7459
TR1
TR
B
C
+
S O
A
D
S R
+
1
INSERT DC MILLIMETER BETWEEN S O AND S FOR CHECKOUT
AND TROUBLESHOOTING.
2
JUMPER USED FOR SINGLE ENTHALPY CONTROL.
The manufacturer has a policy of continuous product and
product data improvement. It reserves the right to
change design and specification without notice.
ENTHALPY CHANGEOVER
SETPOINT
+
1
S
+
C7400
2
DC
620 OHM
MILLIMETER
JUMPER
LED LIGHTS WHEN
OUTDOOR AIR IS SUITABLE
FOR FREE COOLING
M9097
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