5
802961 Rev. 00
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.
x
Circuit breakers, wire size, and electrical
connections tight and correct
x
Filter clean and properly in place
x
Condenser air inlet and outlet free of obstructions
and short-circuiting of condenser air
x
Unit operate for 20 minutes to prove stability
x
Controls operation OK
x
Unit installed in compliance with all codes and
ordinances
x
All panels in place and secured with required
fasteners
x
Mylar overlay applied to cover up touch pad for 24
Volt Remote Thermostat installations.
x
Work area clean and free of debris
x
Owner or operator instructed on control operation
and routine maintenance.
USER CONTROLS - GENERAL
The NYWC series is available with advanced-function
electronic controls with membrane switch type keypad, or,
with conventional knob-actuated electromechanical controls.
ELECTRONIC CONTROLS
The chassis incorporating electronic controls 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.
On/Off Key
Each press of the key toggles the unit from an OFF state to
an ON state or from an ON state to an OFF state. Heating
and cooling functions, as well as the display, and all
indicating LEDs except for the fan indicators, are enabled or
disabled with this key. When toggled OFF, the control
preserves only two modes active; fan-only, and room freeze
protection.
Fan Key
Each press of the Fan Key cycles the fan through three
modes of operation; Low Speed, High Speed and Auto.
Small LEDs will indicate the mode. The On/Off key need
not be ON to operate the fan and set fan speeds. Auto Mode
will cycle the fan on and off, and determine the fan speed, in
conjunction with the heating or cooling demand.
Warmer Key
Pressing the Warmer Key will cause the display to show the
set point temperature for 3 seconds, and then increases room
temperature by 1 degree for every subsequent press of the
key.
Cooler Key
Pressing the Cooler Key will cause the display to show set
point temperature for 3 seconds, and then decreases room
temperature by 1 degree for every subsequent press of the
key
°F/°C Key
This key toggles the display between Fahrenheit and Celsius
temperature modes, and affects all displayed temperatures.
Heat Key
The Heat Key toggles the unit in and out of heating mode for
every press of the key, provided the On/Off Key is ON.
Cool Key
The Cool Key toggles the unit in and out of cooling mode
for every press of the key, provided the On/Off Key is ON.
