York Activa Series User Manual page 5

Air filters
All units have standard filters with metal frame and average filtering of 48 mm available in zig-zag. Gravi‐
metric efficiency is 90%, G4, complying with EN779 and fire resistance is F1 in accordance with DIN
53438.
Optionally, high opacimetric efficiency filters, classes F6 and F7 are available according to EN779. These
filters are easily installed behind the standard filters.
Cooling circuit
The Rooftop ACTIVA units have 1 cooling circuit equipped with 2 compressors placed in tandem. This
makes for better performance when the unit is not running at full capacity, which is usually the case. It
also improves unit operations at extreme temperatures, as it does not jam and continues operating at
partial capacity, using the entire surface of the exchangers.
Based on the accumulated operating hours of each compressor, a control circuit determines the order
of operation, thus lengthening their working life.
Compressors
Vertical hermetic scroll-type compressor, with internal motor protection and standard outside case re‐
sistance.
The compressors have dampers to reduce operating noise and vibrations.
Cooling circuit protection
All cooling circuits are supplied as standard with high and low-pressure switches, dehydrator filter on the
liquid line, discharge temperature cut-out switch, liquid sight glasses and temperature sensors for supply
air, suction liquid and outdoor air.
Service connections
In order to make the connections with a minimum amount of work, electrical and control cables can be
pulled into the unit at the side or through the base.
Electrical panel
The unit's electrical panel meets EN60204-1 and EN60439-1 standards. The main switch with a drive
lever is a standard component on all units. The electric motors are protected with specific thermal mag‐
netic switches and motor protection relays.
The unit is fitted with a sequence and phase fault sensor: where a non R-S-T phase sequence is detected
or where, once the unit is running, there is a phase fault, the sensor will disconnect the power supply to
the main board of the unit, preventing it from starting.
YKN2 Open Control Circuit
This is a 24 V control circuit. It can operate with the optional DPC-1 thermostat (communication) as well
as a 24 V thermostat with control signals (Y1, G, O/B, W).
The YKtool system analyser can be used to simplify commissioning and placement and to solve any
installation or operational faults.
Gas Burner (RAG/RAD Units)
All of the models that operate with gas have the same two capacity control stages. The burner group
consists of an aluminised steel pipe exchanger, adjustable gas valve, electronic starter control, mechan‐
ical ventilation and all the safety controls necessary to satisfy EC standards.
The gas supply pipe is directed to the heating compartment through the front panel of the unit. The unit
provided is complete and ready to be hooked up to a natural gas connection at 20 mbar (2ND-H, G20).
By making certain adjustments, it can also be easily converted to use with the 2ND-L G25 natural gas
family. In addition, it is possible to adapt it to operate with LPG (Liquefied Petroleum Gas propane G31)
using a specific conversion kit for the adaptation.
User manual
General description of the unit
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