Specifications
york air-conditioning products
Fire detection thermostat
This re detection thermostat is protecting the AHU but
must not be used to ensure a full building protection against
re danger. The standard AHU is protected as standard
with a Supply Air probe that shuts the unit down (lockout)
when temperature exceeds 80°C. The electro-mechanical
re detection thermostat is used to full specic local
requirement. A manual reset is necessary.
Motorised outdoor air damper
Equipped with the same dampers as the economizer, the
Return Air probe is not used. Outdoor air damper opens
to pre-set position whenever the indoor fan is operating
(selected from the thermostat, the indoor fan can be
activated with the compressor or to operate continuously)
and will drive fully closed when the indoor fan shuts down.
The rain hood is painted to match the basic unit and
aluminium mesh pre-lter prevents water penetration.
Enthalpy sensors
To control the economizer in humid areas, or when indoor
air humidity needs to remains dry, you should select
enthalpy regulation. Enthalpy sensors will be used with the
triple input economizer.
Fresh air damper and rain hood
The most cost effective method with a complete rain
hood and a xed damper that can be adjusted to provide
approximately 10, 15 or 25% of fresh air.
Barometric relief damper
This accessory can be used to relieve internal air pressure
on units equipped with triple input economiser or
motorised air damper but no power exhaust. When the
rooftop is working in free cooling or introducing fresh air,
the damper opens to relieve over pressure from the return
air section. This accessory is comprised of a rain hood, a
protective grille and a fully assembled damper.
Triple input economizer
This system utilizes 3 probes: Return Air, Outdoor Air
and Supply Air. The Outdoor Air damper and the Return
Air dampers are mechanically interconnected in order to
provide the same airow at the coil inlet, with a single
damper motor. The PCB compares sensor values and
modulates the dampers providing maximum efciency of
the economiser system (free cooling) and comfort (Supply
Air > 12°C). Combined with the air quality sensor, your
payback will be ensured within few months. The rain hood
is painted to match the basic unit and aluminium mesh pre-
lter prevents water penetration.
Power Exhaust
Used to mechanically relieve internal air pressure from
the Return Air section and ensure efcient fresh air
introduction on units equipped with triple input economiser
or motorised air damper. The power exhaust fan motor
works when enough Outdoor Air is blowing into the room
and if Outdoor Air temperature is acceptable (12°C < t° <
30°C).
High speed drive
The high speed drive will increase the supply fan
performance for applications requiring greater air ow and/
or static pressure.
Please consult technical guide for more information.
Low ambient control
All our rooftops are designed to work in cooling mode down
to 7°C ambient temperatures. Although this working range
suits most applications, the units can operate correctly
down to -18°C with optional low ambient control.
Dirty lter switch
Ensures that clean air is being supplied, advises when
maintenance is required to prevent excessive depression
and ensures water integrity of the AHU. These are the main
advantages of lter dirty switch. Connected with the DPC-1
thermostat, the lter icon will appear on the thermostat
screen when a lter change is required.
Indoor air quality
This sensor measures concentrations of pollutant gases,
such as tobacco smoke, human body odours, kitchen
odours, carbon monoxide, etc… It automatically overrides
the economizer when pollutant levels rise above preset
limits. A shorting plug will set the algorithm to acceptable,
good or very good air quality. This VOC sensor (Volatile
Organic Compounds) sends an ON/OFF signal to the control
PCB. The YKlon will then adjust the fresh air damper,
optimising indoor air quality and minimising the energy
consumption.
Smoke detector
The smoke detector is protecting the AHU but must not
be used to ensure a full building protection against smoke
danger. If smoke is detected the AHU is shutdown (lockout).
A manual reset is necessary.
Accessories & options