McQuay Skyline OAC 003G Instalační manuál stáhnout pdf (Strana 31)

McQuay IM 777-7 31

Service and Maintenance

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).

Figure 40: Frame and Filters with Holding Clips

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

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

P r e f i l t e r

F i n a l

F i l t e r

Table 27: Filter Pressure Drops

Bag filters—DriPak 2000

Efficiency 45% 65% 85% 95%

Rated velocity (fpm) 625 500 500 500

Initial pressure drop .20–.26 .21–30 .34–.48 .50–.70

Initial pressure drop 1.0 1.0 1.0 1.0

Cartridge filters—Varicel II MH, 4.25" deep

Efficiency 65% 85% 95% Efficiency

Rated velocity (fpm) 500 500 500 Rated velocity (fpm)

Initial pressure drop .43 .61 .70 Initial pressure drop

Final pressure drop 1.5 1.5 1.5 Final pressure drop

Cartridge filters—Varicel SH, 12" deep

Efficiency 70%

Rated velocity (fpm) 500

Initial pressure drop .39

Final pressure drop 1.2

Pleated panel filters

Type Perfect pleat AMAir 300 4"

Efficiency 30% 30%

Rated Velocity (fpm) 500 625

Initial Pressure Drop .36 .36

Final Pressure Drop 1.0 1.0

5700 filters

Efficiency N/A

Rated velocity (fpm) 500

Initial pressure drop .25

Final pressure drop 1.0

Pleated 62 Plus filters

Size 2" 4"

Efficiency 70% 70%

Initial pressure drop .42 .37

Final pressure drop 1.0 1.0

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 39 40

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