JOHNSON CONTROLS
15
SECTION 1 – INTRODUCTION
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
1
Variable Frequency Drives
When a VAV unit is ordered, the YORK YPAL comes
standard with variable frequency drives (VFD’s). The
VFD can optimize a systems performance by modulat-
ing the supply fan motor speed to reduce energy con-
sumption by as much as 40% while maximizing oc-
cupant comfort.
Fan Spring Isolation
Two-inch spring isolation is used to prevent vibration
transmission from the rooftop unit’s supply fan to the
building.
CONTROLS
Rooftop Controller
The unit is designed to use the Simplicity Elite control.
This control has been used with the 25 to 40 ton Millen-
nium product for many years. The control is designed
to operate with conventional room control input. This
allows the same control to be used on installations re-
quiring 25 to 60 tons of cooling.
The board is equipped with four program buttons and
two character displays for use by the technician. They
allow for access to the most important board functions,
current operating data, and current alarms as well as
the last five alarms in the history memory buffer. The
buttons and displays are also used to program the con-
trol with the correct configuration and setpoints.
The control can also be connected to a computer for
greater access to programming and operating informa-
tion.
Communication
The controller is designed to communicate using Mod-
bus RTU protocol. Through the addition of a Mod-
LINC translator, the unit can also communicate using
BACnet MS/TP protocol.
INDOOR AIR QUALITY
Double Sloped Stainless Steel Drain Pan
The YORK YPAL’s standard Stainless Steel drain pan
meets ASHRAE 62 requirements for condensate drain-
age to improve indoor air quality. Solid wall liners
encase insulation and prevent moisture damage. Ad-
ditional benefits include easy cleanability and isolates
insulation from conditioned airstream.
Double Wall Construction
Is the standard construction of the YORK YPAL and
incorporates powder coated pre-fabricated outer panels
and corner post for maximum exterior surface protec-
tion.
Factory Shrinkwrap
All YORK YPAL rooftop units can be ordered from
the factory with an optional factory-fresh shrinkwrap
packaging. This eliminates the contractors worries
about dirt and debris clogging up condenser coils or
moisture leaking into the air handler on the units way
to the job site or rigging yard.
Demand Ventilation Option
Can be incorporated into the unit to improve indoor air
quality and help manage indoor pollutants such as CO
2
or other harmful airborne contaminates out of the occu-
pied spaces for maximum comfort and safety. Activa-
tion of this sequence can easily be accomplished using
a CO
2
sensor installed in the conditioned space. CO
2
sensors are typically used with demand ventilation;
however other sensors may be applied to control in-
door contaminants such as volatile organic compounds
(VOCs).
Smoke Purge
Is also available to evacuate smoke due to fire from a
room or zone.
Filtration
The YORK YPAL is configured for various types
of filtration to meet the different needs and require-
ments of today's rooftop applications, including 2-inch
throwaway, pleated, carbon, and cleanable filters and
12-inch high efficiency rigid filters.
ELECTRICAL
Single Point Power
The YORK YPAL unit comes standard with single
point power connections to make installation quick
and easy.
Dual Point Power
Can be factory installed for applications that require
the mechanical heating and cooling functions to be
separated from the air handling functions. This enables
the unit to be operated in an emergency condition while
minimizing power consumption.
