Electronic Control Features - Friedrich VERT-I-PAK R410A Service & Parts Manual

ELECTRONIC CONTROL BOARD FEATURES
The new Friedrich Vert-I-Pak has state of the art features to improve guest comfort and conserve energy. Through
the use of specifi cally designed control software, Friedrich has accomplished what other Manufacturer's have only
attempted – a quiet, dependable, affordable and easy to use Vert-I-Pak.
Below is a list of standard features on every Friedrich VPAK and their benefi t to the owner.
Quiet Start/Stop
Fan Delay
Remote Thermostat
Operation
Internal Diagnostic
Program
Service Error Code
Storage
Random
Compressor Restart
Heat Pump Units
Digital Defrost
Thermostat
Instant Heat
Heat Pump Mode
Room Air
Sampling Feature
Desk Control Ready
Indoor Coil Frost
Sensor
Auxiliary Fan Ready
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 en-
ergizing 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.
VPAK units are controlled by a wired remote wall thermostat.
The new Friedrich digital VPAK features a self diagnostic program that can alert maintenance to compo-
nent 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 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.
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 VPAK uses a digital thermostat to accurately monitor the outdoor coil conditions to allow
the heat pump to run whenever conditions are correct. Running the VPAK in heat pump mode save energy
and reduces operating costs. The digital thermostat allows maximization of heat pump run time.
Heat pump models will automatically run the electric heater during compressor lock-out to quickly provide
heat when initially energized, then return to heat pump mode. This ensures that the room is heated quickly
without the usual delay associated with heat pump units.
The room air sampling feature maintains a balanced temperature throughout the room by circulating the
air for 90 seconds once every 9 minutes that the unit is not running when it is set to cooling or heating
mode. By circulating the air, the unit can detect hot or cold areas in the room and operate the unit to cool
or warm the room as necessary. This function is only available when the fan mode is set to 'AUTO' during
COOL or HEAT Mode.
All electronic VPAK units have low voltage terminals ready to connect a desk control energy management
system. Controlling the unit's on/off operation from a remote location like the front desk can reduce energy
usage and requires no additional accessories at the VPAK.
The frost sensor protects the compressor from damage in the event that airfl ow is reduced or low outdoor
temperatures cause the indoor coil to freeze. When the indoor coil reaches 30 ° F the compressor is
diabled and the fan continues to operate based on demand. Once the coil temperature returns to 45 ° F the
compressor returns to operation.
The VPAK features a 24V AC terminal for connection to a relay that may be used to operate an auxiliary
fan to transfer air to adjoining rooms. Auxiliary fans can provide air conditioning to odd shaped rooms.
9