4
Since 1965
MicroMetl
Step 5:
Ensure economizer is square (tol/- 1/32"). Screw
the economizer to the unit along both side flanges and bottom
flange. See Figure 3.
Step 6:
Remove the red tape securing the relief dampers for
shipping purposes. Relocate the outside air sensor from its shipping
location to its operating position, see Fig. 1
Step 7:
If an economizer with a dry bulb sensor will be operating
with an enthalpy outside air sensor, remove the factory installed
9901-2021 dry bulb sensor from the front face of the economizer
(see Figure 1), and install the accessory enthalpy sensor 9901-
2022 in the same location as the dry bulb sensor. Connect the (2)
wire gray harness with plug from the economizer to the enthalpy
sensor. See wiring diagram Figures 23 and 28. Refer to "9901-
2022 Outside Air Enthalpy Sensor” section for more details on
enthalpy settings
Figure 5 – Connect Economizer Harness to Unit
PL6 Economizer Harness
Step 8:
Remove and save the 12-pin jumper plug from the unit
economizer harness – located in the upper left corner of the unit.
Insert the economizer plug into the unit wiring harness. See Figure
5.
Note: the 12-pin jumper plug should be saved for future use, in
the event that the economizer is ever removed. The jumper plug is
not needed as long as the economizer is installed.
Fig. 6 - Typical Indoor Fan Motor
Access Panel Locations
Indoor Blower
Access Panel
Unit Control
Box Panel(s)
Center Post
Step 10:
In the hardware kit provided with the economizer is the
9901-2020 Jade controller (Honeywell W7220). The controller is
attached to a mounting bracket and the economizer harness is
attached to the controller. Mount the controller assembly on the
left side of the unit control box. Screw bracket to the control box
through pre-punched holes in control box. See Figure 7.
Figure 7 – Mount Controller Assembly in Unit
Control Box
(Some control box configurations may differ)
Step 11:
Unplug the 10-pin female ECON plug currently connected
to the Central Terminal Board (CTB). See Figure 8.
Rooftop Unit’s
12-Pin Male Plug
Economizer
12-Pin Female Plug
For 48/50LC 07-12 Instructions, see pages 10-12
Fig. 4 - Rear Economizer Flange Installation
(ECD-SRT12CA-D2*H and ECD-SRT34CA-D2*H)
Unit Filter
Rack
Unit Base
Economizer
Hold Down Tab
Economizer Rear Flange
Economizer
Step 9:
Remove the indoor blower access panel and the panel(s)
covering the unit control box. See Figure 6.
