YORK INTERNATIONAL
32
Installation
FACTORY INSTALLED CONTROLS AND ELECTRICAL
OPTIONS
YORK has the capability to furnish units with factory
installed single point power motor starter panels, discon-
nects, marine lights, sensors, actuators or complete unit
automation. Factory installed wiring greatly reduces in-
stallation time and cost. (See Figures 36, 37 and 38)
Factory installed inverters, the YORK Air-Modulator,
provide the most efficient and cost effective VAV con-
trol in a complete factory package. Factory mounted
inverters not only save field labor, but it also assures
proper fan balance for vibration free operation. While
most fans are balanced for a single speed, fans with
inverters are factory balanced to operate over the en-
tire RPM range.
VARIABLE AIR VOLUME APPLICATIONS
Factory-mounted variable frequency drives (YORK
Air-Modulator) and variable inlet vanes are available
with the YORK CurbPak for Variable Air Volume Appli-
cations.
YORK Air-Modulator (Variable Frequency Drive):
The YORK Air-Modulator (variable frequency drive)
offers the most efficient means of fan control for vari-
able air volume systems. The Air-Modulator varies the
speed of the fan to match the VAV load requirements.
The Air-Modulator takes maximum advantage of the
relation between fan speed and fan horsepower. With
the Air-Modulator, any reduction in fan speed results in
a cubic reduction in fan horsepower. For example, a
10% speed reduction results in a 27% fan horsepower
reduction!
Each Air-Modulator (AirMod) is shipped with installa-
tion, operation, programming, tech support and trouble-
shooting information packed inside.
Variable Inlet Vanes
Variable inlet vanes are another method of energy effi-
cient fan control. While the fan runs at a constant speed,
the inlet vanes modulate the air entering the fan. This
produces a reduced air volume resulting in lower oper-
ating horsepowers.
The vanes are located within each inlet cone of airfoil
fans and adjacent to the inlet ring of forward curved
fans.
The vanes consist of a series of radial damper blades
which operate in parallel and are controlled by a com-
mon shaft which extends to the outside of the fan.
Variable Inlet Vane operation will af-
fect coil and air blender performance
as well as condensate drainage.
FIG. 37 – MOTOR STARTER PANEL
FIG. 36 – YORK AIR-MODULATOR W/OPTIONS PANEL
27442A
00386VIP
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