Installation
8
ACC-SVN203C-EN
3. Build the fresh air hood assembly per
a. Apply gasket to 4, aligning to top edge of 4.
b. Apply gasket to 6 and 7 as shown.
c. Attach 9 to 6 and 7 using two screws on each side.
d. Attach 5 to 4 using three screws.
e. Attach assembly built in
screws on each side.
f. Apply gasket to the fresh air hood assembly,
aligning with three sides of the assembly.
g. Insert and slide 8 through 9.
Figure 5.
Fresh air hood assembly
4. Install economizer end panel using 10 screws and filter
access door using 13 screws. See
Figure 6.
End panel and filter access door installation
5. Locate unit economizer control wiring harness plug
PPM2A. The plug is located in the upper front section
of the return air (attached to unit divider panel).
Remove the mating connector plug and connect
PPM2A to the economizer wire harness. See
.
Figure 7.
Mating connector plug removal
6. Remove unit top cover and control box access panel.
Route relay harness as shown in
a. Locate economizer fault relay (EFR) wire harness
(wires 163A and 164A looped near economizer
section).
b. Secure unterminated end of the harness with a wire
tie in the control panel to the left side of the power
terminal block (near the Customer Connection LTB
terminal strip).
c. Connect economizer fault relay (EFR) to smart
thermostat. Strip 163A and 164A wires and
individually wirenut them to the two fault input
wires from the thermostat. Terminate the fault
input wires on the appropriate input terminals on
the thermostat. The thermostat wires need to be
rated for 600V, 105C and UL 1230 or 1231.
d. After mounting and powering the thermostat,
configure the thermostat to display a fault message
(e.g., Economizer Fault) whenever the dry contact
input goes high. Consult thermostat's user manual
for detailed instructions.
5
6
Gasket
4
7
9
8
Gasket
Gasket
4
Gasket
5
7
Economizer
end Panel
Filter
Access
Door
PPM2A
Mating
Connector
Plug
