Form O-Y P/N 273647R5, Page 7
Dirty Filter Switch (Options BE18 or BE28)
Systems may be equipped with a dirty filter pressure switch (Option BE18) that will
trigger an alarm when the resistance through the inlet air filters indicates that filter
replacement is required. Systems with an energy recovery wheel may be equipped
with two dirty filter pressure switches (Option BE28), one for the inlet air filters and
one for the energy recovery wheel supply filters.
When performing maintenance, check the condition of the sensing tubes to be sure
that they are not blocked. Check the wiring connections. To set a new dirty filter
switch, see Installation Form I-Y, Paragraph 8.3. Replacement switch is
P/N 105507
.
Permanent Filters in the Outside Air Hood (Option AS16)
If equipped with an outside air hood, there are 1" permanent, aluminum filters at the
entrance of the hood. The filters act as a moisture eliminator and bird screen. See
FIGURE 3
, shown below.
When inspecting the inlet air filters, inspect the outside air
hood filters. If cleaning is needed, remove the filters, clean, rinse, dry and re-install.
NOTE:
If it is more convenient to keep an extra clean set of filters, filter sizes and part
numbers are listed below.
3.1 Filters (cont'd)
Front Cover
Instructions:
1
) Remove two screws,
one on each end of
the front cover.
Remove the cover.
2) Slide filters out.
3) Clean and dry filters.
4) Return filters to hood
and replace cover.
Filter
Filter
Filter
Filter
Cabinet Size
1
2
3
YSDA Models
--
120, 150
180, 210
YDHA, YDMA
Models
060, 090, 120, 150
180, 210, 240
300, 360
Filter No / Size /
(Qty)
101607
16x20x1 - (4)
101610
20x25x1 - (4)
101609
16x25x1 - (8)
FIGURE 3 - Removing
and Installing Filters
in the Outside Air
Hood
Energy Recovery Wheel Filters
- The energy recovery wheel has two 1-inch filters
in both the supply and exhaust airstreams. Replacements are listed below. Size of fil
-
ter is determined by CFM. Permanent filters may be washed and dried and re-used.
To access filters, open the wheel door. Slide the filters out of the filter racks.
Do not operate the system without filters in place.
Filter Application by Cabinet & ER Wheel Sizes
Cabinet
Size
ER Wheel Size
Model
Model Size
Qty Filter Size
1" Permanent
P/N
1
30" dia
YDHA & YDMA
060, 090, 120, 150
4
16 x 16
104102
36" dia
090, 120, 150
4
20 x 20
101608
2
36" dia
YDHA & YDMA
180, 210, 240
4
20 x 25
101610
YDSA
120, 150
4
20 x 25
101610
46" dia
YDHA & YDMA
180, 210, 240
4
25 x25
119779
YDSA
120, 150
4
25 x 25
119779
3
36" dia
YDSA
180, 210
4
20 X 25
101610
46" dia
YDSA
180, 210
4
16 x 20
101607
4
20 x 20
101608
2
16 x 25
101609
2
20 x 25
101610
52"dia
YDHA
300, 360
4
16 x 20
101607
4
20 x 20
101608
2
16 x 25
101609
2
20 x 25
101610
58"dia
YDHA & YDMA
300, 360
4
16 x 20
101607
4
20 x 20
101608
2
16 x 25
101609
2
20 x 25
101610
