5
803877 Rev. 00
5.
Locate the 24 Volt wiring harness shipped with the
unit. The harness is employed if a remote 24 Volt AC
wall thermostat will be used instead of the unit-
mounted touchpad. If a 24 volt remote thermostat
will be used, connect the multi-wire 24 volt wiring
harness to the mating plug protruding beneath the
control box, as applicable, following the detailed
instructions on the particular wiring diagram affixed
to the specific unit being installed. Insulated crimp-on
connectors are provided at the end of every
connection lead to facilitate connections/insulation.
6.
Set the manual damper operator (if present) in the
open or closed position depending on the desired
operation. If the unit is equipped with a powered
damper, it will open and close whenever the indoor
fan is operated on high speed, as the factory default.
7.
Plug the heat/cool chassis cord into the power
receptacle located either in the sub-base or the wall,
as applicable.
8.
Install the filter and filter bracket/screw, and then
lock the front panel on by inserting the tabs into the
corresponding slot and sliding the front cover down
until it seats.
WARNING:
Operating the unit without the filter in
place can not only damage the unit, but also expose the
user to a hazard from rotating parts, potentially
resulting in bodily injury. The filter is intended to be
removable with the use of a tool. The filter bracket and
screw secure the filter. Always remember to re-install
the filter, filter bracket, and screw after servicing the
chassis, or replacing/cleaning the filters.
9.
Wipe unit cabinet/wall sleeve to remove dirt, etc.
10.
The unit is now ready for operation, when supplied
with power from the distribution panel and wired to a
remote thermostat (if applicable).
START-UP CHECKLIST
Note: Once the unit is installed, it should be checked
for proper function by qualified service personnel
before turning it over to the User.
Circuit breakers, wire size, and electrical
connections tight and correct
Filter clean and properly in place
Condenser air inlet and outlet free of
obstructions and no short-circuiting of
condenser air
Unit operated for 20 minutes to prove stability
Controls operation OK
Unit installed in compliance with all codes and
ordinances
All panels in place and secured with required
fasteners
Mylar overlay applied to cover up touch pad
for 24 Volt Remote Thermostat installations.
Work area clean and free of debris
Owner or operator instructed on control
operation and routine maintenance.
USER CONTROLS - GENERAL
NAEC series is available with advanced-function
electronic controls with membrane switch type keypad.
ELECTRONIC CONTROLS
The chassis incorporating electronic controls is factory-
shipped with an active keypad control and display
mounted directly to the control panel. The unit
functions are controlled by the user by pressing the
keys on the keypad, and reading the display. However,
the unit also has the latent ability to be field-converted
by qualified service personnel for use with a field-
supplied 24 volt AC wall thermostat. These
instructions will address both unit-mounted control
operation, and remote 24 volt AC wall thermostat
operation.
CONTROL AT THE UNIT, KEYPAD/DISPLAY
THE KEYPAD CONTROL
Become familiar with the keypad keys as shown in
Figure 1.
Display
Red light emitting diodes (LEDs) display the actual
temperature of the air entering the unit at floor level.
The display can also be used to indicate the desired set
point temperature for room comfort. It is important to
remember that the temperature displayed is the
temperature sensed at the unit’s indoor air inlet and can
be significantly different from the bulk room
temperature at a distance from the unit.
