71
TEMPMASTER
FORM TPM3-EG1 (518)
6.
Power Return Fan:
A single width, single inlet (SWSI) plenum fan shall be provided
to draw return air from the building to the single package unit. An access door shall
be provided on at least one side of the unit for fan/motor access. The return fan shall
operate to maintain a constant pressure within the return plenum.
7.
Power Return Fan with Exhaust:
A SWSI plenum fan shall be provided to draw
return air from the building to the single package unit. An access door shall be pro-
vided on at least one side of the unit for fan/motor access. The return fan shall oper-
ate to maintain a constant pressure within the return plenum. A discharge damper
shall be provided to modulate building exhaust. The damper shall be controlled via
building pressure. The RA damper shall be linked with the OA damper to modulate
volumes of return and outside airflows.
[FOR POWERED EXHAUST OR RETURN FAN OPTIONS ABOVE, USE THE FOL-
LOWING]
1.
Fan Motor:
Fan motors shall be NEMA design ball-bearing types with electrical
characteristics and horsepower as specified. Motors shall be 1750 RPM, open
drip-proof (ODP) type [total enclosed fan-cooled (TEFC) optional]. [Optional shaft
grounding rings on motors increase motor longevity when applied with a VFD.] The
motor shall be located within the unit on an adjustable base.
2.
Mountings:
Fan and fan motor shall be internally mounted and isolated on a full
width isolator support channel using 1-inch springs [2-inch springs and seismic re-
straints optional]. The fan discharge shall be connected to the fan cabinet using a
flexible connection to ensure vibration-free operation.
3.
Bearings and Drives:
Fan bearings shall be self-aligning, pillow block, or flanged
type regreaseable ball bearings and shall be designed for an average life (L50) of
at least 200,000 hours. All bearings shall be factory lubricated and equipped with
standard hydraulic grease fittings and lube lines extended to the motor side of the
fan. Fan drives shall be selected for a 1.5 service factor and anti-static belts shall be
furnished. All drives shall be fixed pitch. Fan shafts shall be selected to operate well
below the first critical speed and each shaft shall be factory coated after assembly
with an anti-corrosion coating.
Filter Section
[SELECT A FILTER RACK, FILTER MEDIA, AND SWITCH IF DESIRED]
1.
Angled Filter Rack:
2-inch carbon media MERV 7 filters shall be provided in an
angled filter rack.
2.
Angled Filter Rack:
2-inch cleanable filters shall be provided in an angled filter
rack.
3.
Angled Filter Rack:
2-inch high-efficiency (30%) MERV 8 pleated filters shall be
provided in an angled filter rack.
4.
Flat Filter Rack:
60–65% efficient MERV 11 rigid filters with a 2-inch high-efficiency
pleated pre-filters shall be provided in a flat filter rack.
5.
Flat Filter Rack:
90–95% efficient MERV 14 rigid filters with a 2-inch high-efficiency
pleated pre-filters shall be provided in a flat filter rack.
6.
Dirty Filter Alarm:
A dirty filter switch shall be provided and wired to the single
package unit control panel. Upon closure of the switch, the controller shall display
a dirty filter fault. The setting of the switch can be changed manually to close at a
specified pressure drop across the filters.