MicroMetl ECD-SRT SA Series - Page 6

4
Economizer
Unit Without Economizer o
r
2 Position Damper
Fig. 7 - Economizer Wiring
Fig. 8 - Typical Indoor Fan Motor
Access Panel Locations
Fig. 10 - Economizer Hood Installation
Fig. 9 - Supply Air Temperature (SAT)
Mounting Location (Probe or Ring Type)
Indoor Fan Motor
Access Panel
Heating Access
Panel
Thermostat
Connection
Access Panel
Mounting Screws
Economizer
Hood
Economizer
Center Post
16. Review the controller setting options in the Conguration section.
a. On -DWFS economizers with xed dry bulb, the outside air
temperature will allow free-cooling below 70 degrees F.
On -DWDS economizers the outside air temperature allowed
for free-cooling is adjustable on the C7660 sensor. See gure
12 for details.
On -DWES and -DWZS economizers with a C7400 OA
enthalpy sensor, the temperature / humidity allowed for free-
cooling is adjustable with the ABCD potentiometer
on the W7212 controller. See gure 14 for details.
The -DWZS economizer also includes a eld installed
differential return enthalpy to be mounted in return duct. See
gure 13.
b. The low temperature compressor lockout switch setting is
xed at 38° or 42°F.
c. The supply air temperature sensor maintains a 55 degree F
temperature.
Mounting Location
for Probe Type SAT
Mounting Location
for Ring Terminal
Type SAT
Wire to Unit’s
Pink and Violet
Wires