17
TEMPMASTER
FORM TPM3-EG1 (518)
ECONOMIZER
The economizer section is used for ventilation of the conditioned space to maintain indoor
air quality (IAQ), and also to reduce energy consumption by using outside air cooling in lieu
of mechanical cooling. If outside air is appropriate for cooling, but not sufficient for the cool-
ing demand, mechanical cooling will stage on as necessary until the cooling load is met.
Dual (comparative or differential) enthalpy operation is the most accurate and efficient
means of economizer operation. The IPU controller monitors the return and outside air
energy content, and selects the lower of the two for operation.
VARIABLE AIR VOLUME (VAV) SUPPLY AIR PRESSURE CONTROL
Traditional single package unit systems use inlet guide vanes (IGVs) for duct static pres-
sure control. These control supply duct pressure by modulating dampers (introducing losses
and inefficiencies) on the inlet of the fan, open and closed. TempMaster variable frequency
drives (VFDs) offer superior fan speed control and quieter, energy efficient operation.
FIGURE 3 -
TRADITIONAL OVERHEAD VARIABLE AIR VOLUME (VAV) AIR
DELIVERY SYSTEM
For variable air volume (VAV) applications, the TempMaster OmniElite
unit uses a VFD
to modulate fan speed and maintain a constant duct static pressure. VFDs offer superior
control over the operation of the unit at part load, and offer the additional benefits of qui
-
eter and more efficient operation when compared to IGV.
BUILDING PRESSURE CONTROL SYSTEMS
Building pressure control systems are often necessary when economizers are used to
bring in outside air. Without proper building exhaust, the building may become over pres-
surized. The pressure control system maintains the proper building pressure by expelling
the appropriate amount of air from the building.
FRONT
FRONT
TOP VIEW
SIDE VIEW
LD08045
NOTE:
This diagram is provided as a visual reference of the TempMaster OmniElite discharge air (DA) & return air (RA) openings & locations
for all sizes. Please refer to the dimensional data for exact size & location of panels and openings.