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OPERATION
Function and Control
Friedrich PTAC Digital Control and Unit Features
The new Friedrich digital PTAC has state of the art features to improve guest comfort, indoor air quality and conserve energy.
Through the use of designed control software for the PTAC industry Friedrich has accomplished what other Manufacturer’s
have only attempted – a quiet, dependable, affordable and easy to use PTAC.
Below is a list of standard features on every Friedrich PTAC and their to the owner.
Digital Temperature
Readout
By digitally monitoring desired room temperature the room is controlled more precisely than
conventional systems. The large, easy to read LED display can show either set-point or actual
room temperature as selected by owner.
One-Touch Operation
When the unit is powered off the unit can be returned directly to heating or cooling mode
by pressing the ‘Heat’ or ‘Cool’ buttons without the confusing power up sequence of some
controls. One-touch control takes guesswork out of unit control delivering a more enjoyable
experience and eliminating front-desk calls.
Three Fan Speeds
The Friedrich PTAC/PTHP units feature three fan speeds for the user to select from. This
allows the user to properly match the amount of cooling/ heating for their comfort level and
also deliver's quiet performance.
Individual Mode and Fan
Control Buttons
By having separate control buttons and indicators for both fan and mode settings the Friedrich
digital control eliminates the confusion of previous digital PTACs The accurate temperature
setting provides greater guest comfort than other systems.
Quiet Start/Stop Fan Delay The fan start and stop delays prevent abrupt changes in room acoustics due to the compressor
energizing or stopping immediately. Upon call for cooling or heating the unit fan will run
for five seconds prior to energizing the compressor Also, the fan off delay allows for “free
cooling” by utilizing the already cool indoor coil to its maximum capacity by running for 30
seconds after the compressor.
Two-Speed Wall
Thermostat Mode
When connected to a wall thermostat the user can select from high or low fan speed at the
thermostat, unlike competitive models that have only one speed selection This allows for
more comfortable and quieter operation Requires the use of Friedrich remote thermostat
RT6 or equivalent thermostat with two speed fan output.
Remote Thermostat
Operation
Some applications require the use of a wall mounted thermostat. All new Friedrich PTACs may
be switched from unit control to remote thermostat control easily without the need to order a
special model or accessory kit
Internal Diagnostic
Program
The Friedrich digital PTAC features a self diagnostic program that can alert maintenance to
component failures or operating problems The internal diagnostic program saves properties
valuable time when diagnosing running problems.
Service Error Code
Storage
The self diagnosis program will also store error codes in memory if certain conditions occur
and correct themselves such as extreme high or low operating conditions or activation of the
room freeze protection feature. Storing error codes can help properties determine if the unit
faced obscure conditions or if an error occurred and corrected itself.
Electronic Temperature
Limiting
By limiting the operating range the property can save energy by eliminating “max cool” or
“max heat” situations common with older uncontrolled systems. The new electronic control
allows owners to set operating ranges for both heating and cooling independently of one
another.
Room Freeze Protection
When the PTAC senses that the indoor room temperature has fallen to 40° F the unit will cycle
on high fan and the electric strip heat to raise the room temperature to 46° F then cycle off
again This feature works regardless of the mode selected and can be turned off. The control
will also store the Room Freeze cycle in the service code memory for retrieval at a later date.
This feature ensures that unoccupied rooms do not reach freezing levels where damage can
occur to plumbing and fixtures.
Random Compressor
Restart
Multiple compressors starting at once can often cause electrical overloads and premature unit
failure. The random restart delay eliminates multiple units from starting at once following a
power outage or initial power up. The compressor delay will range from 180 to 240 seconds.
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