Instruction Manual

Form O-Y P/N 273647R1, Page 7
Dirty Filter Switch (Options BE18 or BE28)
Systems may be equipped with a dirty lter pressure switch (Option BE18) that will
trigger an alarm when the resistance through the inlet air lters indicates that lter
replacement is required. Systems with an energy recovery wheel may be equipped
with two dirty lter pressure switches (Option BE28), one for the inlet air lters and
one for the energy recovery wheel supply lters.
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 lter
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 lters at the
entrance of the hood. The lters act as a moisture eliminator and bird screen. See
FIGURE 3, shown below. When inspecting the inlet air lters, inspect the outside air
hood lters. If cleaning is needed, remove the lters, clean, rinse, dry and re-install.
NOTE: If it is more convenient to keep an extra clean set of lters, lter 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 lters
in both the supply and exhaust airstreams. Replacements are listed below. Size of l-
ter is determined by CFM. Permanent lters may be washed and dried and re-used.
To access lters, open the wheel door. Slide the lters out of the lter racks.
Do not operate the system without lters 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