Friedrich VERT-I-PAK VHA-18K75RTP, Service & Parts Manual

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21 PB
OPERATION
Electronic Control Board Features
The Friedrich Vert-I-Pak has state of the art features to improve guest comfort and conserve energy.
Below is a list of standard features on every Friedrich VPAK and their benefitt to the owner.
Quite 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 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.
Remote Thermostat Opera-
tion VPAK units can be configured to be set up with a wired thermostat, wireless thermostat, or an
ernegy management thermostat.
Internal Diagnostic Program The 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.
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.
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.
Heat Pump Units Digital
Defrost Thermostat The VPAK uses a digital thermister 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.
Instant Heat Heat Pump
Mode 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.
Room Air Sampling Feature 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.
Desk Control Ready 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.
Indoor Coil Frost Sensor The frost sensor protects the compressor from damage in the event that airflow 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 tempera-
ture returns to 45°F the compressor returns to operation.
Auxiliary Fan Ready 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.