Orion System OE742-XX-VAVZ - Manual (Page 19)

Form: Orion-OE523-RdSlaveDmpr-Sub-01F
Page 2 of 2
Slaved Zone Damper Sizing
Use a load program to determine the peak load for
each zone. These calculations will be used in
selecting the appropriate Zone and Slaved Zone
Damper sizes. Only pressure dependent Zone
Dampers may be slaved.
The Orion Systems utilize a typical low pressure
duct design. To reduce noise problems, duct
pressures should not exceed 1” W.C.
Primary trunk ducts used with Orion systems
should not be “undersized”. With larger trunk
ducts, it is easier to assure relatively constant
pressure to each Zone Damper. Runs should be
as short as possible, and the trunk duct system
kept as symmetrical as possible to facilitate
system balancing. Wherever possible, run the
trunk ducts above corridors and locate the master
Zone and Slaved Zone Dampers above corridors
to reduce the noise in the space and facilitate
service of the valves. Trunk ducts should be sized
for no more than 0.1” W.C. drop per 100 ft. of
duct, and a maximum duct velocity of 2000 FPM.
Up to a maximum of two additional Slaved Zone
Dampers may be connected together with the
main Zone Damper(s) for large zone
air flow requirements. This design should be reserved only
for situations when it is not practical to use a single large
Zone Air Damper.
It is recommended that the Slaved Zone Damper(s) should
be of the same size as the master Zone Damper. This
insures that adequate air flow and minimum noise will
occur at all damper positions.
Divide the total zone CFM required by the total number of
air valves to be used.
Using the maximum acceptable velocity for a branch duct
(typically 1000-1500 FPM for minimal noise), go to the Air
Damper Selection Data Chart below and find the quantity
and size of Air Dampers that will deliver the required CFM
as determined by the load program
Note:
Compare the Zone and Slaved Zone Damper
sizes selected against the branch duct sizes to
determine if the next size up or down will
provide acceptable performance without
requiring a transition fitting.
Order one OE520-XX Round Pressure Dependent Zone
Damper of the size selected previously. Order one or two
OE523-XX Round Slaved Zone Dampers as required, of
the same size as the Zone Damper just selected. The
Round Slaved Zone Dampers will track and maintain the
same damper position as the master Zone Damper.
Slaved Damper Selection Data OE523-XX Slaved Zone Damper Assembly
(Pressure Dependent Only)
Zone Air Damper Round Duct Size
(Area Ft 2 )
6”
(0.196)
8”
(0.349)
10”
(0.545)
12”
(0.785)
14”
(1.069)
16”
(1.396)
Velocity Through Zone Air Damper
FPM
Airflow Through Zone Air Damper – CFM
( ΔP
S
inches W.C. w/ Air Damper Full Open)
500
98
(< 0.01)
175
(< 0.01)
273
(< 0.01)
393
(< 0.01)
535
(< 0.01)
698
(< 0.01)
750
147
(0.01)
262
(0.01)
409
(0.01)
589
(< 0.01)
802
(< 0.01)
1047
(< 0.01)
1000
196
(0.015)
349
(0.015)
545
(0.01)
785
(< 0.01)
1069
(< 0.01)
1396
(< 0.01)
1250
245
(0.025)
436
(0.02)
681
(0.015)
981
(0.015)
1336
(0.015)
1745
(0.015)
1500
294
(0.035)
523
(0.035)
818
(0.022)
1178
(0.020)
1604
0.020)
2094
(0.020)
1750
343
(0.045)
611
(0.035)
954
(0.034)
1374
(0.030)
1871
(0.030)
2443
(0.025)
2000
392
(0.065)
698
(0.043)
1090
(0.040)
1570
(0.040)
2138
(0.040)
2792
(0.030)
WattMaster reserves the right to change specifications without notice
OE523-XX Round Slaved Zone
Damper Assembly