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11 

803809 Rev. 01  

.125” thick non-adjustable louvers (

all provided in the 

kit). To ensure proper operation it is important that 
all installation instructions shipped with the duct 
kit are strictly followed. What is presented in these 
instructions is a basic overview only.  
 
 

 

 
The Duct Plenum is designed to be reversible 
(shown with right discharge) and is permanently 
capped at one end. A decision is made whether to 
duct right or left and the Duct Plenum is 
positioned with the opening directed accordingly. 
A strip of blank-off plates (not shown) is supplied 
with the kit to allow the installer to snap off and 
adjust the number of active plates required to 
divert a given amount of air to the adjacent room 
via the Extension Duct. 
 
 Using the maximum number of plates to restrict 
the plenum outlet opening results in a 60% 
physical blockage that will divert up to up to 50% 
of the total air flow to the adjacent room.  

To preserve the intended functionality of the 
design, do not attempt to add additional 
restriction to exceed the 60% maximum 
amount of blockage.

  The detailed installation 

instructions shipped with the duct kit will provide 
more detail regarding percent air diversion relative 
to number of plates used. 
 
To install the Duct Plenum, the Discharge 
Grille/Control Door assembly must first be 
removed from the Chassis Air Outlet by removing 
the screw located under the control door.  
The Duct Plenum can now be installed. Insert the 
Duct Plenum tabs into the slots provided in the 

Chassis Enclosure based on the direction you 
require the air discharge. On the opposite end of 
the tabs there will be an existing screw location. 
Use the screw removed previously to secure the 
Duct Plenum to the Chassis Air Outlet.  
 
Lay the desired number of blank-off plates into the 
Duct Plenum in accordance with the kit 
installation instructions. Re-install The Discharge 
Grille/Control Door assembly that was removed 
from the Chassis Air Outlet so that the control 
door is above the touchpad controls, and secure 
using the screw provided in the kit. The Discharge 
Grille/Control Door assembly should now reside 
in the Duct Plenum outlet if the installation was 
done correctly. 
 
To complete the assembly, cut the 48” Extension 
Duct to the desired length, slide it on to the 
protruding flanges of the Duct Plenum outlet and 
secure with the two beige screws provided, and 
then terminate the duct with the Air Terminal 
Grille by fastening it to the wall in the adjacent 
room. 
 
To give full access to remove the Chassis at a later 
date, the Discharge Grille/Control Door assembly 
can be removed with a single screw to give access 
to the Duct Plenum, and the Duct Plenum can be 
removed with a single screw by pulling slightly 
upward and sideways on the capped end, once the 
two beige screws have been removed from the 
duct extension.    

Summary of Contents for NFWC Series

Page 1: ...PACKAGED TERMINAL AIR CONDITIONER PTAC Cooling with Hot Water or Steam Heating INSTALLATION OPERATION MANUAL IMPORTANT READ AND SAVE THESE INSTRUCTIONS INSTALLATION AND WIRING MUST BE IN ACCORDANCE WITH CEC NEC AND LOCAL ELECTRICAL CODES ...

Page 2: ...or cooling during the building s construction stage To access the air filter first remove the grille cover from the heating subbase by rotating the two turn finger and thumb fasteners until the grille cover releases The unit front panel need not be removed The air filter is located directly below the heat exchange coil and slides out freely Always replace the grille cover after re inserting the fi...

Page 3: ...sleeve has a 1 8 per foot slope downward toward the outside to ensure proper water drainage out the back edge of the sleeve during overflow conditions The specified slope corresponds to a 1 8 bubble on a carpenter s level The wall sleeve must also be level from side to side HEATING SUB BASE The heating subbase contains a tube and fin heat exchanger that is configured for the use with hot water or ...

Page 4: ... tubes Always pipe the valve to the supply connection If the heating medium is hot water connect the valve outlet Supply to the lower connection and the Return water to the upper connection If the heating medium is steam connect the valve outlet Supply to the upper connection and the Return to the lower connection Route the steam or water source to the valve s inlet connection Install the piping v...

Page 5: ...t or debris that may have accumulated Replace any air seals that are damaged or missing if applicable Heating Cooling Chassis Installation 1 Locate the wall sleeve seal shipped with the unit and apply it to the top front flange of the wall sleeve running even with the bottom edge of the flange see illustration 2 Slide the chassis into the wall sleeve until firmly seated against the seals Push from...

Page 6: ...r in the bottom of the heating subbase so it is sure to sense true return air temperature and not air that has been heated by the heating coil Use the clamp provided to secure the bulb in place IMPORTANT To avoid damaging the indoor thermistor wire always remove the thermistor from the clamp holder before removing the chassis for service IMPORTANT Operating the unit without the filter in place can...

Page 7: ...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 di...

Page 8: ...ge 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 which 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...

Page 9: ... 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 n...

Page 10: ... 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...

Page 11: ...from the Chassis Air Outlet by removing the screw located under the control door The Duct Plenum can now be installed Insert the Duct Plenum tabs into the slots provided in the Chassis Enclosure based on the direction you require the air discharge On the opposite end of the tabs there will be an existing screw location Use the screw removed previously to secure the Duct Plenum to the Chassis Air O...

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