Friedrich Digital Control Features - Friedrich PTAC Installation & Operation Manual

Friedrich Digital Control 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 specifi cally designed control software for the PTAC industry Friedrich has accomplished what other Manufactur-
er'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 benefi t to the owner.
Digital Temperature
Readout
One-Touch Operation
Individual Mode and
Fan Control Buttons
Quiet Start/Stop
Fan Delay
Remote Thermostat
Operation
Wireless Remote
Control Ready
Internal Diagnostic
Program
Service Error Code
Storage
Constant Comfort
Room Monitoring
Electronic Temperature
Limiting
Room Freeze
Protection
Random Compressor
Restart
Digital Defrost
Thermostat
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.
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.
By having separate control buttons and indicators for both fan and mode settings the Friedrich digital control eliminates the confu-
sion of previous digital PTACs. The accurate temperature setting provides greater guest comfort than other systems.
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 fi ve 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.
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.
Guests can adjust the temperature and mode of the unit through the use of an optional hand held wireless remote, improving guest
comfort and relaxation.
The new 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.
The self diagnosis program will also store error codes in memory if certain conditions occur and correct themselves such as ex-
treme 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.
The on-board processor monitors time between demand cycles (heat or cool) and will cycle the fan every 9 minutes to sample the
room condition and determine if the desired conditions are met. This allows the room to have similar benefi ts to a remote mounted
stat without the complication or cost of a wall mounted thermostat.
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.
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 fi xtures.
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.
The new Friedrich PTAC uses a digital thermostat to accurately monitor the outdoor coil conditions to allow the heat pump to run
whenever conditions are correct. Running the PTAC in heat pump mode save energy and reduces operating costs. The digital
thermostat allows maximization of heat pump run time.
920-087-04 (8-05)
5