INSTALLER'S GUIDE
page 3
Single Enthalpy Sensor (Outdoor Air Only)
1.
Units with economizers already installed:
When
installing the enthalpy sensor after the economizer has
been installed remove the economizer rain hood.
2. Remove the two screws securing the disk type thermo-
stat on the damper side of the economizer.
3. Next, disconnect the wires 56A and 50A(YL) from the
thermostat.
4. Using the two screws removed in step 2, mount the
Enthalpy sensor on the outside face of the economizer.
See figure below.
5. Connect wire 56A to S and 50A(YL) to + terminal on the
Enthalpy sensor.
6. Remove the filter access panel on the return side of the
unit reach into the Control Module attached to the
Economizer Motor, remove the red resistor from termi-
nals S
R
and + and discard. See figure 4.
7. Remove the white resistor from between the S
O
terminal
and wire 56A. Than install the white resistor across the
S
R
and + terminals
665184
8. Install the terminal adaptor provided with the sensor on
terminal S
O
of the Control Module and connect wire
56A to it.
9. Reinstall the rain hood and filter access panel.
Installation for Differential Enthalpy
Sensing
1. Complete the procedures for installing a single enthalpy
sensor.
2. Mount the second enthalpy sensor in the return air
stream. See figure below.
4. Install field supplied wires through from terminals S
and + on the return enthalpy sensor to the S
R
and +
terminals on the Control Module.
6. On the Control Module (Solid State Economizer Logic
Module) attached to the Economizer Motor, remove the
white resistor from between the S
R
terminal and the +
terminal. Then connect the wire from S on the sensor to
S
R
on the Control Module and + on the sensor to + on the
Control Module.
7
Installation for BAYECON073 Horizontial Discharge Economizer:
