TEMPMASTER
10
FORM TPM3-EG1 (518)
Modulating Powered Exhaust with a VFD
– This option consists of a VFD to modulate the
speed of the exhaust fan to control the flow of exhaust air. The VFD control logic is based
on the building static pressure setpoint within the single package unit controller. The static
pressure transducer is provided in the return plenum of the single package unit, and 5/16-
inch or 1/4-inch plastic tubing and static pressure sensor must be supplied by others and
installed in a representative location in the building.
Powered Return Fan with Exhaust
– This option uses single width, single inlet (SWSI)
plenum fan(s) to control building pressure. The fan motors are driven by a VFD to maintain
a constant return plenum pressure. An exhaust hood with a modulating control damper
is used to maintain building pressure via the building static pressure. The static pressure
transducer is provided in the return plenum of the single package unit, and 5/16-inch or
1/4-inch plastic tubing and static pressure sensor must be supplied by others and installed
in a representative location in the building. The powered return fan is also available with-
out the exhaust capabilities. For units with no exhaust capabilities, the HVAC system must
provide alternate means of controlling building pressure.
SUPPLY FAN OPTIONS
Double Width, Double Inlet (DWDI) Airfoil Supply Fan
–
The standard airfoil blade sup-
ply fan is available on all models for higher static conditions. This offers higher efficiency
and lower sound in certain applications.
Fan Skid Isolation –
The entire supply fan assembly is isolated from the unit base with
either 1-inch (standard) or 2-inch deflection springs with seismic restraints.
Supply and Exhaust Fan Motors –
Premium efficiency open drip-proof (ODP) and pre-
mium efficiency total enclosed fan-cooled (TEFC) motors are available all meeting the
Energy Policy Act of 1992 (EPACT).
Supply Fan VFD and Manual Bypass –
For VAV applications, VFDs are provided to
modulate air flow. Optional manual bypass can also be provided to allow full airflow in the
event of a VFD failure.
Direct Drive Plenum (DDP) Fan –
A direct drive plenum (DDP) supply fan provides out-
standing reliability and efficiency, eliminating the possibility of conditioned air supply inter-
ruption due to a broken belt and the pollution of conditioned air with belt dust. The supply
fan can be optionally equipped with a piezo ring to precisely measure the amount of air
delivered to the conditioned space. The speed of the supply fan is controlled by a VFD.
EVAPORATOR SECTION
Double Sloped Stainless Steel Drain Pan –
The TempMaster OmniElite’s stainless steel
drain pan is factory-mounted and installed on every unit. A condensate drain trap is need-
ed and must be provided and installed in the field by others.
LD08022
*NOTE:
This is a visual reference only. Actual drain pan pitch will vary.
FIGURE 2 -
DRAIN PAN DETAIL
Features and Benefits (Cont'd)