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INSTALLER'S GUIDE
4. Using the two screws removed in step 2, mount the
Enthalpy sensor in the thermostat's previous location,
see figure 2.
5. Connect wire 56A to S and 50A(YL) to + terminals on the
Enthalpy Sensor.
6. On the Control Module (Solid State Economizer Logic
Module) attached to the Economizer Motor, remove the
red resistor from terminals S
figure 4.
7. Remove the white resistor from between the S
and wire 56A. Than install the white resistor across the
S
and + terminals
R
8. Install the terminal adaptor provided with the sensor on
terminal S
of the Control Module and connect wire 56A
O
to it.
9. Replace the economizer/filter access panel.
Installation for Differential Enthalpy
Sensing (Outside Air & Return Air)
1. Complete the procedures for installing a single enthalpy
sensor.
2. Mount the second enthalpy sensor on the bottom side of
the motor deck, see figure 3.
3. Remove the knockout located below the Economizer
Motor and insert a snap bushing.
4. Install field supplied wires through the snap bushing
3
DIFFERENTIAL
ENTHALPY SENSOR
page 2
and + and discard. See
R
terminal
O
SCREWS
4
Control Module before Installation
W7459D
TR
B
C
S O
D
A
S R
MIN.
POS.
OPEN
5
Control Module with One Enthalpy Sensor
W7459D
TR
B
C
S O
A
D
S R
MIN.
POS.
OPEN
1
JUMPER USED FOR SINGLE ENTHALPY CONTROL.
6
Control Module with Two Enthalpy Sensors
W7459D
B
C
A
D
MIN.
POS.
OPEN
2
(R4) WHITE
620 OHM
TR1
JUMPER
+
+
S
DISK TYPE
+
1
THERMOSTAT
(R1) RED
750 OHM
JUMPER
LED LIGHTS WHEN
OUTDOOR AIR IS SUITABLE
FOR FREE COOLING
M9097_W/O
ENTHALPY CHANGEOVER
SETPOINT
TR1
+
+
S
C7400
+
1
(R4) WHITE
620 OHM
JUMPER
LED LIGHTS WHEN
OUTDOOR AIR IS SUITABLE
FOR FREE COOLING
M9097_1_
ENTHALPY CHANGEOVER
SETPOINT
TR1
TR
+
S O
S R
+
+
S
LED LIGHTS WHEN
OUTDOOR AIR IS SUITABLE
FOR FREE COOLING
M9097_2_
+
S
C7400
C7400
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