Greenheck Adjustable Pressure Controller (468292) User Manual
Application
Document Number 468292
Adjustable Pressure Controller
EM-10 series, Horizontal Mount - Vertical Airflow Up
EM-30 series, Vertical Mount - Horizontal Airflow
EM-40 series, Horizontal Mount - Vertical Airflow Down
Application
The Adjustable Pressure Controller (APC) provides mechanical adjustment of start open pressure for the Greenheck
model EM series damper. The APC is mounted to the bottom frame member (sill) and connects to the bottom blade
linkage pin. Dampers MUST be equipped with blade counterbalance.
The ability to resist damper opening is limited per the table below. Note: Adjustable Pressure Controller (APC) is not
intended to assist in opening blades or to substitute for counterbalance weights. Use one APC assembly per damp-
er panel.
Area
Maximum Set Pressure
(ft
2
)
(m
2
)
(in. wg)
(Pa)
4
0.37
0.75
187
6
0.58
0.50
125
8
0.74
0.40
100
10
0.93
0.30
75
15
1.40
0.20
50
20
1.86
0.15
37
24
2.23
0.125
31
19
3
6
7
8
9
2
10
20
1
11
12
13
14
16
15
5B
5A
4
17
18
Item #
Part #
Description
Qty
1
705238
Mounting Bracket
1
2
823936
Control Knob Sub-Assembly
1
3
705241
Release Rod
1
4
653631
1/2 in. Non-Knurled Crankarm
1
5A
705239
Connecting Bar (4 1/8 in. long)
*
5B
705240
Connecting Bar (3 in. long)
*
6
457803
Spring
1
7
457806
3/16 in. E-Clip
1
8
453728
Link Separator Spring -SS
1
9
454092
5/32 in. x 1.5 Roll Pin - SS
2
10
416052
#10-32 x 5/8 in. SS Threadstud
2
11
415991
#10-32 Keps Nut -SS
2
12
415555
#10 x 1/2 in. Tek Screw - ZP
2
13
451588
1/4 in. E-clip- ZP
1
14
451819
1/4 x 1/2 in. Knurl Pin - ZP
1
15
415609
1/4 - 20 x 1/2 in. Threadstud
2
16
415455
1/4 - 20 Spinlock Nut-ZP
2
17
415482
3/16 x 1/2 in. nylon washer
2
18
415483
1/2 in. .030 in. nylon washer
1
19
415484
1/2 in. Push-On Retainer-ZP
1
20
Frame sill of damper
* See page 2 Table for correct connecting bar
Field Installation Instructions for EM series Backdraft Damper with
Counterbalance
®