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100
Table 26 —
Damper Operating Torque (in.-lb)
NOTES:
1. Damper shaft moves 90 degrees from open to close.
2. Operating torques are shown for one damper. Multiply the value shown by the number of dampers for total with one actuator.
Zone Damper Section
Refer to Fig. 45 and install the section as follows:
1. Remove the screws holding the zone damper section to the
heating coil section and remove the lag screws holding the
damper to the shipping skid.
2. Place the supplied
1
/
4
-in. thick x 1
1
/
2
-in. grey foam gasket
around the perimeter of the cooling and heating coil section
discharges. Use two gasket strips on partition panels to obtain
double width.
3. Rig the zone damper section and lift it into position on (verti
-
cal discharge) or next to (horizontal discharge) the gasketed
cooling and heating coil sections.
4. Fasten the damper section to the coil sections using the sup
-
plied
1
/
4
-14 x
3
/
4
-in. sheet metal screws.
5. Install control shaft and bearing for each individual zone after
cutting linkage (for the job specific zone
application).
Control shaft extensions are bagged and wrapped to the
inside of the zone damper blades. Additional field-supplied
shaft extensions may be ordered from local Ruskin supplier,
part no. 10-020569-00B.
6. Zones should be split for equal airflow through each damper.
ZONE DAMPER LINKAGE (FIG. 45 AND 46)
Note that damper control levers and a common operating bar are
factory installed on upper end of damper shafts on top of zoning
damper assembly. To facilitate the installation of field-supplied
damper operators, the operating bar may be cut and the control le
-
vers repositioned as follows:
1. Check job prints to determine number and size of zones
required and damper operator locations.
2. Cut and remove portion of operating bar between zones as
required.
3. Install actuators on field-fabricated support brackets. Connect
actuator linkage to the center axle of interconnecting zones.
4. Adjust actuator for correct damper operation. Be sure actua
-
tor, linkage, and dampers operate freely. See Table 26 for
operating torque requirements.
COMPONENT
39M UNIT SIZE
03W
06W
07T
08W
09T
10W
11T
12T
12W
14W
16T
17W
18T
21W
22T
25W
Zone
Damper
N/A
12
N/A
12
N/A
12
N/A
N/A
12
12
N/A
12
N/A
12
N/A
12
Mixing or
Exhaust Box
13
26
31
32
34
41
48
52
41
53
55
58
59
70
82
77
Side Mixing or
Exhaust Box
13
26
33
29
45
37
54
54
46
56
63
61
66
77
93
91
CD60 / Airflow
Measuring
Damper
5/8
8/16
9/19
10/20
10/21
12/25
14/29
15/31
12/25
21/32
14/34
17/36
17/36
20/42
24/50
20/46
Integral and
Internal Face
and Bypass
NA/38
150/38
150/62 150/100 150/80 150/140 150/103 150/111 150/170 150/175 150/139 150/175 150/155 150/175 150/190 150/175
External Face
and Bypass
38/14
38/26
N/A
80/32
N/A
120/41
N/A
N/A
150/41
160/54
N/A
180/60
N/A
180/70
N/A
180/77
COMPONENT
39M UNIT SIZE
25T
30W
30T
35T
36W
37T
40W
42T
50W
51T
58T
61W
72W
85W
96W
110W
Zone
Damper
N/A
12
N/A
N/A
18
N/A
18
N/A
18
N/A
N/A
18
N/A
N/A
N/A
N/A
Mixing or
Exhaust Box
100
94
120
135
143
120
158
134
187
184
184
235
187
226
226
381
Side Mixing or
Exhaust Box
99
105
122
150
146
151
161
178
207
178
202
248
248
278
325
369
CD60 / Airflow
Measuring
Damper
29/62
27/57
35/72
39/81
41/87
35/72
46/95
45/94
54/112
53/111
53/111
68/141
73/152
84/177
96/201 109/228
Integral and
Internal Face
and Bypass
150/209 150/175 150/249 150/290 150/195 150/309 150/232 300/343 300/251 300/407 300/461 300/304 300/486 300/572 360/634 360/712
External Face
and Bypass
N/A
180/95
N/A
N/A
203/129
N/A
224/128
N/A
280/170
N/A
N/A
338/253 546/253 639/295 721/334 819/379
CAUTION
Factory duct collars and damper assemblies are for attaching
ductwork only and must NOT be used to support the duct’s
weight. Weight bearing deflection can increase torque
necessary to operated dampers, or bind them preventing any
movement.
CAUTION
Damper operation may be impaired if ductwork is supported
by the unit.