Applied Comfort NYWC Series User manual

1802961 Rev. 00
NYWC SERIES UPFLOW PACKAGED TERMINAL AIR CONDITIONERS
Hydronic or Steam Heating and Cooling Unit
INSTALLATION & OPERATION MANUAL
IMPORTANT:
READ AND SAVE THESE INSTRUCTIONS. INSTALLATION AND WIRING MUST
BE IN ACCORDANCE WITH CEC, NEC AND LOCAL ELECTRICAL CODES.

2802961 Rev. 00
NYWC Series
Cooling with Hydronic or Steam Heating Chassis
GENERAL INFORMATION
WARNING: To avoid property damage, bodily injury or
death, ensure power is disconnected before any service is
attempted. Repairs should be made by qualified service
personnel only. The chassis must be installed in accordance
with the Authority Having Jurisdiction, and all Local and
National Codes, including the National Electrical Code, and
the Canadian Electrical Code, as applicable.
FOR EFFICIENT OPERATION
Air Filter
Keep air intake filter clean. Units are provided with a
washable filter that can be cleaned with soap and water.
Inspect and clean the filter a least once a month or more
often as conditions dictate. Replace as necessary. A dirty,
clogged filter reduces the efficiency of the system. It can
also cause erratic performance of controls and can result in
damage to the motor and compressor.
IMPORTANT: An improperly maintained filter, or not
using a filter, will void the warranty.
Clean Coils
As part of regular servicing, clean the condenser coil,
heating coil and evaporator coil at least annually, or more
often as dictated by the severity of the particulates and
pollutants circulating in the outdoor and indoor operating
environments. One suggested method is as follows:
Unimpeded Outdoor Airflow
Do not block off the outside air flow to the unit. The
condenser air inlet and outlet must be free of obstructions,
and of any external influence that would cause the hot
discharged condenser air to be re-circulated back into the air
intakes. Outdoor air is drawn into the condenser section via
the air intake on the right side of the rear grill. Hot
condenser air is strongly ejected out of the left portion of the
rear grill, thereby minimizing air re-circulation back into the
intake areas. Paper, leaves, dirt, or other material blocking
airflow, or fouling the condenser coil can impair efficiency
and cause serious damage to the compressor.
Oiling
The motors are permanently lubricated and do not require re-
oiling.
Unimpeded Indoor Airflow
Ensure that drapes, bed, bedspread, and furniture etc. do not
block the indoor air discharge and intake air openings,
causing a restricted air flow condition through the indoor air
handling section of the unit. Do not place articles on
discharge grille – especially liquids.

3802961 Rev. 00
Reducing Load
To reduce the cooling load, draw drapes or blinds in the
summer, to reflect direct rays from the sun.
To reduce the cooling and heating load, keep windows and
doors closed when operating the unit.
WALL SLEEVE CABINET INSTALLATION:
Install the wall sleeve cabinet in strict accordance with the
wall sleeve installation instructions, which are supplied with
the wall sleeve.
ELECTRICAL WIRING AND RECEPTACLE
WIRE SIZING
A single outlet branch circuit from the main electrical panel
to the receptacle in the wall sleeve should be used. Wire
sizing shall be in accordance with the minimum circuit
ampacity as declared on the unit Rating Plate for the specific
chassis. Wire sizing must also take into account any distance
from fuse box to receptacle to prevent excessive voltage
drops in undersized wires.
IMPORTANT: Low voltage to the unit will cause
compressor starting problems and decrease the performance
and reliability of the compressor.
BRANCH CIRCUIT PROTECTION
The Current Rating of branch circuit protection using a Time
Delay Fuse or HACR circuit breaker should also be as
declared on the unit Rating Plate, for the specific chassis
being installed.
PLUG AND RECEPTACLE
All 230-208 Volt units are furnished with a NEMA 6-20P,
20 Amp non-locking plug, and hence will require a NEMA
6-20R receptacle to be field-provided.
All 115 Volt units are furnished with a NEMA 5-15P, or 5-
20P non-locking plug as applicable. The respective plug will
require a NEMA 5-15R or 5-20R receptacle to be field-
provided.
All 277 Volt units are furnished with a NEMA 7-20P, 20
Amp non-locking plug, and hence will require a NEMA 7-
20R receptacle to be field-provided.
Note: 277 Volt units are considered to be permanently
connected, per the National Electrical Code. The plug and
cord are considered to be a “connector of convenience” in
order to facilitate easy removal of the chassis for servicing.
The plug and cord are suitably protected when using the
non-optional 277 volt sub-base.
230-208 and 115 volt units are true “cord connected units”,
and are provided with a service cord of the LCDI (Leakage
Current Detection Interrupter) type, intended to be plugged
in to a wall receptacle. The LCDI cord is capable of
detecting some of the common faults experienced with aging
power cords, and when those faults are detected, interrupts
power to the cord before a hazardous condition can evolve.
The LCDI service cord, with its bulky plug head and
inherent mechanical protection, is not intended to be plugged
into a receptacle in a subbase.
WARNING: To avoid property damage, bodily injury or
death, the unit must be used on a grounded power supply
only. The unit will be grounded through the service cord
plug and matching receptacle as long as the branch circuit
remains grounded.
DO NOT:
xChange the length of the service cord.
xBend the connector blades or otherwise alter
service cord plug configuration.
xUse extension cords.

4802961 Rev. 00
CHASSIS INSTALLATION
1. Unpack heat/cool chassis from shipping carton. Check for
any shipping damage.
2. The chassis must be level from side-to-side and from front-
to-rear, once the chassis side flanges are drawn up tight to
the wall sleeve using the four flange screws. This can only
be achieved if the wall sleeve was installed level in all
directions, which they should have been according to the
Original Equipment Manufacturer’s instructions. If the
sleeves were originally installed with a slight slope in the
order of ¼” per foot downward from the indoor to outdoor
side, the chassis will still function properly, but the indoor
drain kit option will not work properly with it. A slope
downward from outdoor-to-indoor side is not permissible
and must be corrected before the unit is operated.
3. There are vertical air seals at the rear of the unit that
surround the condenser outlet that will engage and “seal”
against the rear grille. However, in some cases, such as
when an extra deep wall sleeve is used, or some other
variation is encountered that prevents the air deflectors
from sealing against the outdoor grille, then steps must be
taken to add anti-recirculation baffles to prevent hot
condenser air from short-circuiting back into the air intake
via the void space created in behind the outdoor grill.
4. Position the chassis in the cabinet and slide into place.
Keep the chassis level and square to prevent binding. The
chassis must be pushed into the wall sleeve until the side
flange seals of the chassis engage the sleeve. Alternately
tighten each of the four draw screws until the chassis is
drawn snugly into the sleeve. Do not over-tighten the draw
screws.
5. If the unit is equipped with electronic controls and
touchpad, locate the 24 Volt wiring harness coiled beneath
the control box. The harness is employed if in one or both
of these situations exist; one, if a remote 24 Volt AC wall
thermostat will be used, and two, if a 24 Volt AC aquastat
will be used. If either of these situations exist, 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 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. If an aquastat
will be not be used, connect the ends (blue/orange) of
the aquastat leads together to permanently complete
the aquastat circuit.
6. If the unit is equipped with mechanical knob controls and
touchpad, this variation cannot be adapted to work with a
remote thermostat. Locate the 24 VAC aquatsat output
connector beneath the control box. A mating connector and
6 feet of wire leads are supplied to connect to an aquastat
switch if desired. The leads can be shortened as required. If
an aquastat will not be used, connect the ends
(orange/orange) of the aquastat leads together with a
field-supplied insulated connector to permanently
complete the aquastat circuit.
7. For all control variations, two 24 VAC hydronic valve
output connectors are provided – one under the control
box, and one at the bottom of the left side panel. A mating
connector and 2 feet of wire leads are supplied to connect
to a 24 VAC hydronic valve. The units can accommodate a
normally-open NO or a normally-closed NC hydronic
valve.
NO or NC is selected by a switch. The NO/NC switch is
located on the bottom front edge of the control box for
mechanical knob control units and is accessible to the user
once the room enclosure front panel is removed.
The NO/NC switch is located in the high voltage wiring
compartment as a DIP switch on the electronic control
equipped units, and is factory set to NO. The setting can be
changed to NC in the field, but only by qualified service
personnel.
WARNING: The NO/NC conversion procedure involves
exposure to high voltage electrical circuits in the control box
in order to make the necessary change to the DIP switch, and
must be performed by qualified service personnel. Failure to
do so could result in property damage, personal injury or
death. Disconnect electric power to the unit before servicing.
8. Plug the heat/cool chassis cord into the power receptacle
located either in the subbase or the wall, as applicable.
9. Install the front panel and secure it with the two retaining
screws located in its bottom corners.
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 only with the
use of a tool. Always remember to re-install the filter and
filter retaining clip after servicing the chassis, or
replacing/cleaning the filters.
10. Wipe unit cabinet/wall sleeve to remove dirt, etc.
11. The unit is now ready for operation, when supplied with
power from the distribution panel and wired to a remote
thermostat (if applicable).

5802961 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.
xCircuit breakers, wire size, and electrical
connections tight and correct
xFilter clean and properly in place
xCondenser air inlet and outlet free of obstructions
and short-circuiting of condenser air
xUnit operate for 20 minutes to prove stability
xControls operation OK
xUnit installed in compliance with all codes and
ordinances
xAll panels in place and secured with required
fasteners
xMylar overlay applied to cover up touch pad for 24
Volt Remote Thermostat installations.
xWork area clean and free of debris
xOwner 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.

6802961 Rev. 00
Figure 1
OPERATION USING KEYPAD
When the unit is first plugged in, or when recovering from a
power outage, there will be a random 5 to 15 second delay
before the electronic control powers up. This minimizes the
large electrical surge that would otherwise occur if all units
in a building started up at the same time.
To Initiate Heating or Cooling Mode
Press On/Off Key to turn on the LED display and commence
full functionality. Push the °F/°C Key to obtain the desired
temperature scale. Press the Heat or Cool key as applicable,
and the current indoor temperature will be shown on the
display.
Set Desired Temperature
Press Cooler, or Warmer key as applicable. Each push of the
key increases or decreases the set point temperature by 1
degree, as applicable.
Set Fan Mode
Press Fan key to cycle through the fan settings as indicated
by the small circular LEDs. Select continuous High Speed
fan, continuous Low Speed fan, or Intermittent Fan by
selecting Auto. Auto cycles the fan on and off with the calls
for heating or cooling. Auto also sets fan speed according to
the amount of heating or cooling demanded. In Auto mode,
the fan will start up periodically to establish airflow; air
temperature will be sampled, and then the fan will shut off
again if there is no demand.
Disable Heating or Cooling, but Initiate Fan-Only
Press On/Off key to turn off LED display. Press Fan key to
cycle through the fan settings as indicated by the small
circular LEDs. Select continuous High or Low speed. Do not
select Auto, as it will turn the fan off.
CONTROL AT THE WALL THERMOSTAT
CONVERSION TO 24V REMOTE THERMOSTAT
Except for the wall thermostat and thermostat cable,
everything is included with the unit to field convert a
keypad-operated unit to 24 Volt AC wall thermostat
operation by qualified service personnel. Specific conversion
instructions are detailed on the wiring diagram affixed to
each particular unit to be converted. Conversion involves
accessing the high voltage wiring compartment and
changing a DIP switch setting on the electronic board. Once
the DIP switch setting has been changed, operation will be in
remote thermostat mode as soon as power is restored to the
control.
WARNING: The conversion procedure involves exposure
to high voltage electrical circuits in the control box in order
to make the necessary change to the DIP switch, and must be
performed by qualified service personnel. Failure to do so
could result in property damage, personal injury or death.
Disconnect electric power to the unit before servicing.
A factory-supplied 24 Volt wiring harness is provided with
every unit to facilitate connection to the wall thermostat
wiring. One end has a multi-pin connector that mates with a
connector exiting the unit. The other end has preinstalled
butt splice connectors, which play a dual role in insulating
any unused connectors, and can also be used to make the
wire connections for wires that are used.
The final step is to apply the masking label provided, to
cover up the keypad. The keypad and display will be
disabled and no longer be available for control. The masking
label markings instruct the user to go to the wall thermostat
for controlling the unit.
COMPATIBLE THERMOSTATS
The features of the 24 VAC wall thermostat chosen will
dictate the extent of the features available from the unit.

7802961 Rev. 00
Electric Heat / Cool and Cooling-only
The following thermostats in either manual or automatic
changeover may be used:
xSingle Stage Heat/Cool, Single Speed Fan
xSingle Stage Heat/Cool, Two Speed Fan
Note: For full functional capability, the thermostat selection
must be verified to ensure its control logic will always
energize a Fan output (G) as well as the heating output (W)
on a call for heat – otherwise known as an “Electric Heat
Type Thermostat”. If the thermostat to be used has a “W”
output only on a call for heat, consult the specific wiring
diagram affixed to the chassis control box for the remedial
around instructions.
The thermostats listed above can have single speed or two
speed fan control.
The wiring diagrams affixed to the units will guide the
specific connection strategies for the particular thermostats
used.
THERMOSTAT LOCATION:
Proper functioning of the thermostat depends on accurate
room temperature sensing. Be conscious of locating the
thermostat where temperatures near the thermostat are not
representative of room temperature. For example, do not
install the thermostat where it is subjected to direct sunlight,
other sources of heat, or to cold drafts, including air
discharged from a supply air register. A common error is
forgetting to seal the hole in the wall where the thermostat
cable passes through, directly behind the thermostat body.
Air bleeding from behind the wall can drastically affect the
temperature sensed by the thermostat.
REMOTE THERMOSTAT OPERATION
When the unit is first plugged in, or when recovering from a
power outage, there will be a random 5 to 15 second delay
before the electronic control powers up. The keypad will be
totally disabled once the DIP switch has been set for remote
mode. The unit will obey the commands from the thermostat
only.
The thermostat will automatically maintain the temperature
in the room, based on the setting pre-set by the user. If the
thermostat has only single fan speed capability, a decision
will need to be made as to whether the fan will always run in
high speed or low speed, and then the appropriate fan speed
wiring connection can be made a the unit.
All the internal control features of the electronic board
remain active, except for keyboard and display interface
functions and room temperature sampling. Room
temperature is detected at the location of the wall thermostat,
and is usually a much more accurate representation of bulk
room temperature. The thermostat used may have advanced
features beyond the basic functions described below.
Consult your thermostat Installation and Operating
Instructions for further information.
In addition to controlling room temperature, the room
thermostat is also used to select whether the unit is to be in
heating mode, or cooling mode, or in automatic changeover
between the modes. It also determines whether the system is
to be ON or OFF, and whether the fan is to run continuously,
or to cycle with heating or cooling demand.
Figure 2
Once a comfortable temperature setting is established, no
other adjustments are necessary, except for fan speed, which
may or may not be adjustable on your particular thermostat.
CAUTION: One side of the unit’s 24-volt control system is
grounded. When wiring the thermostat, care must be taken not
to ground the wires, or drive a nail through the thermostat wire
bundle, thereby potentially burning out the transformer.

8802961 Rev. 00
WALL THERMOSTAT OPERATION
Heat Sets the unit into heating mode.
Initiates heating when room
temperature falls below set point.
Off Disables heating and cooling modes,
but allows control of fan.
Cool Sets the unit into cooling mode.
Initiates cooling when room
temperature rises above set point.
Auto
(not shown) Found on automatic changeover thermostats only. Allows the
thermostat to decide whether it should
be in the heating or cooling mode.
Usually a 4 Fqdifferential or
“deadband” will exist between
heating and cooling set points to
prevent inadvertent rapid switching
between modes.
Temperature
Setting Establishes the “set point”, or desired
room temperature.
Fan On Synonymous with “Fan Continuous”.
Fan will continue to run after the
heating and cooling function has
cycled off. Fan will continue to run
even when mode switch is in Off
position.
Fan Auto Synonymous with “Fan Intermittent”.
Fan will cycle on and off with the
heating cycle or cooling cycle, and
will not operate between cycles.
ADDITIONAL FEATURES:
Some additional features of the Electronic Control units are
as follows:
Room Freeze Protection
This feature is enabled when the unit is shipped from the
factory. The feature can be disabled by qualified service
personnel. If power is available to the unit, and regardless of
whether it is turned ON or OFF, the unit will automatically
supply heat to the room with the fan running at low fan
speed if the room temperature falls to 55°F (13ºC). The heat
will turn off when the room temperature reaches 60°F
(16ºC). For the feature to work, the unit must be configured
with a heat source, whether it be electric heater or hydronic
(hot water would need to be standing by). The feature is
enabled whether the unit is configured for keypad or remote
thermostat.
Compressor Short-Cycle Protection
If the electronic control shuts the compressor down for any
reason, a 3 minute time delay will elapse before the
compressor is allowed to re-start. This prevents compressor
overload during re-start due to unequal system refrigerant
pressures.
Indoor Coil Freeze Protection
Control of frost on the evaporator coil due to low indoor
loads, or cold outdoor ambient temperatures, is provided.
The protection remains active when the unit is OFF, for
either keypad or remote thermostat application, as long as
the unit is plugged in, power is available, and a heat source
is configured in the unit and is working.
Low Outdoor Temperature Lock-out
If the outdoor temperature is too low for proper compressor
operation, cooling operation will be suspended.
Indoor Temperature Limiting (Keypad Control Only)
Using the keypad control and display, high and low
temperature limits can be established to prevent the user
from entering set point temperatures colder or warmer than
what the property manager or hotel operator may desire. The
temperature limit choices are as follows:
Configuration Code Low Limit °F
(ºC) High Limit °F (ºC)
R1 63 (17) 86 (30)
R2 65 (18) 86 (30)
R3 65 (18) 90 (32)
R4 67 (19) 88 (31)
R5 67 (19) 92 (33)
R6 69 (20) 90 (32)
R7 69 (20) 72 (22)
The procedure to set the limits is as follows:
Depress the On/Off key, the °F/°C key, and the Warmer key
simultaneously for 5 seconds to enter the limit setup mode.
The Warmer and Cooler keys will scroll through the R-
values indicated in the above table. Once the desired R-value
has been obtained on the display, press the On/Off key to
accept the change, and then press it again to effect the
change and restore the normal display.
ELECTROMECHANICAL DIAL CONTROLS
Room temperature is controlled on both heating and cooling
by the temperature control knob. Clockwise rotation
decreases the temperature in the room. Counter-clockwise
rotation decreases the temperature in the room.
Rotate the “Temperature” dial a small amount at a time in
the direction that you wish the temperature to go. Moving
the dial more than ½” at a time may over-compensate
leading to an extreme hot or cold situation. Once a

9802961 Rev. 00
comfortable setting is determined and set, no other
adjustments are necessary.
Over-adjusting the thermostat will not increase the rate at
which the unit will heat or cool the space; it is merely an on-
off switch that responds to temperature.
Fan speeds in heating and cooling operation are controlled
by a “Fan Speed” knob. Rotate the knob to the right of “0”
for cooling operation, and to the left of “0” for heating
operation. Rotation of the knob changes fan speed as
follows:
3 = High Speed 2 = Low Speed 1 = Low Speed
ATTENTION: When operating in cooling mode, if the
compressor is shut off by rotation of the “Temperture” or
“Fan Speed” dial, then wait for 3 minutes before re-starting
the compressor.
Figure
Thermostat Temperature Limiting Feature
The purpose of temperature limiting is to allow the property
owner to control the maximum and minimum temperature
that an end-user can obtain during operation of the unit, and
can be an important energy saving feature. This is
accomplished by limiting the thermostat knobs range of
rotation between preset limits set by the property owner. The
unit is shipped from the factory allowing a wide range of
rotation. Altering the range of rotation is easily done.
Remove the thermostat knob by pulling it with sufficient
force—DO NOT PRY. Turn the knob over and observe the
plastic rib coming off the side of the knob stern. The rib is
designed to engage limiting stop screws that can be arranged
to limit the maximum and minimum set-point temperatures
for the thermostat. On the dial plate, just below the
thermostat shaft you will notice two Phillips head screws
(with washers) in “Standard Position” (see Fig. 1). This
allows a wide range of thermostat rotation, representing a
range of temperatures between approximately 18°C and
29°C (65ºF and 85ºF). The left screw in Standard Position
can be removed and re-inserted in four alternate holes
moving in a clockwise direction in order to reduce the
maximum allowable set-point temperature for heating.
Similarly, the right screw can be relocated in four alternate
holes moving in a counter-clockwise direction to increase
the minimum allowable set-point for cooling. Moving to the
next screw location alters the set point limit by about 1.4ºC
(2.5ºF) (see Fig 2).
For example, moving the left screw clockwise 4 positions
over from Standard Position limits the maximum heating
set-point temperature to 29.4ºC – (4 x 1.4ºC) = 23.8ºC (85ºF
– (4 x 2.5ºF) = 75ºF). Similarly, moving the cooling set-
point right screw counter-clockwise 2 positions over from
Standard Position limits the minimum temperature to 18.3ºC
+ (2 x 1.4ºC) = 21.1ºC (65ºF + (2 x 2.5ºF) = 70º F).
Therefore in this example roughly speaking, the end user
cannot heat the room to greater than 23.9°C (75ºF) nor cool
the room to less than 21.1°C (70ºF) .Experimentation may
be necessary to obtain a desirable setting. Keep in mind that
the actual thermostat temperature sensing occurs at the
sensing bulb in the return air stream, sensing air being pulled
in through the bottom of the front panel near the floor.
NOTE : IF THE ROOM TEMPERATURE IS STILL NOT
SATISFACTORY AT THE COOLEST THERMOSTAT
SETTING, THEN COMPLETELY REMOVE THE RIGHT
HAND LIMITING STOP SCREW.
Before reinstalling the knob, manually turn the thermostat
shaft so that the rib under the knob will locate in between the
stop screws once the knob is installed. Failure to follow this
step will yield an unintended temperature range.