Front Load Filter Option; Filter Gauges - McQuay Skyline OAC 003G Installation And Maintenance Manual

Front Load Filter Option

Front loaded filter options require that the filters be removed
and replaced from inside the unit.
To remove filters, rotate the wire clips. This releases both the
prefilter and the final filter. When installing clean filters, check
to verify the filters are fully seated in the frame
Figure 40: Frame and Filters with Holding Clips
P r e f i l t e r

Filter Gauges

Filter gauges indicate pressure drop for installed filters. If
prefilters are present, the gauge will indicate the pressure drop
for both pre- and final filters
Table 27 shows the typical filter pressure drop for clean filters
at rated air flow. The tables also show a final pressure drop for
front loaded filters.
Where a single filter gauge is used, the prefilters can be
removed to check the pressure drop of the final filters.
Figure 41: Filter Gauge
McQuay IM 777-7
(Figure
F i n a l
F i l t e r
F i l t e r
F r a m e
R o t a t e
W i r e C l i p s
Table 27: Filter Pressure Drops
Bag filters—DriPak 2000
Efficiency
Rated velocity (fpm)
Initial pressure drop
Initial pressure drop
40).
Cartridge filters—Varicel II MH, 4.25" deep
Efficiency
Rated velocity (fpm)
Initial pressure drop
Final pressure drop
Cartridge filters—Varicel SH, 12" deep
Efficiency
Rated velocity (fpm)
Initial pressure drop
Final pressure drop
Pleated panel filters
Type
Efficiency
Rated Velocity (fpm)
Initial Pressure Drop
Final Pressure Drop
5700 filters
Efficiency
Rated velocity (fpm)
Initial pressure drop
Final pressure drop
Pleated 62 Plus filters
Size
Efficiency
Initial pressure drop
Final pressure drop
Service and Maintenance
45% 65% 85%
625 500 500
.20–.26 .21–30 .34–.48
1.0 1.0 1.0
65% 85% 95%
500 500 500
.43 .61 .70
1.5 1.5 1.5
70%
500
.39
1.2
Perfect pleat
30%
500
.36
1.0
N/A
500
.25
1.0
2" 4"
70% 70%
.42 .37
1.0 1.0
95%
500
.50–.70
1.0
Efficiency
Rated velocity (fpm)
Initial pressure drop
Final pressure drop
AMAir 300 4"
30%
625
.36
1.0
31