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 3
9/81 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.
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