2-27
johNSoN coNtroLS
ForM 102.20-N1 (1109)
2
Actuator installation Mutlizone (MZ) - Field
Supplied
When actuators are field supplied on multizone
dampers, the following information is intended to aid
in sizing and selection:
• Torque required is 7 inch pounds per square foot
of damper area up to 2500 FPM velocity.
• Damper blades are 6" wide and vary in height.
• Calculate the torque by number and size of blades
in each individual zone. Remember there are
hot deck blades directly connected to cold deck
blades.
• Blades per zone are to be determined by system
CFM and static pressure requirements for each
zone by the Engineer’s construction docu-
ments.
• The blade linkage (flat rods) connecting all blades
of each deck are to be cut at the appropriate places
to divide the decks into correct size zones. These
blade linkage rods are mounted externally on the
assembly. Be sure to cut a section of the flat con
-
necting rod out. This is to prevent interference
when zones modulate in opposite directions.
• One Damper Shaft Extension Kit is provided for
each zone per the Factory Order Form
(see Fig.
2-37).
DAMPER SHAFT EXTENSION KIT
P/N 026-33715-002
Fig. 2-37 –
DAMPER SHAFT EXTENSION KIT
LD13784
• Actuators and actuator mounting brackets are
to be supplied by the contractor. Part numbers
available upon request.
• On rear mount (discharge through end of unit);
always mount the actuators on the top of the up-
per (hot) deck.
• Do not allow duct insulation to restrict damper
blades or external linkage.
• Direct coupled actuators are recommended.
• Duct connections are to be made at the zone
dividers without damper blade restriction.
inERtiA FAn BASE Fill inStRuCtiOn
Inertia fan bases are pre-engineered according to fan
and motor size. Each cavity having a pre-installed
corrugated bottom is to be filled to the top with wet
concrete. The contractor must take care not to get
concrete mix on the bolts and adjusting parts of the
adjustable motor base, sheaves, belts or on the floor
under the edges of the isolated fan base. The amount
of concrete can be calculated by measuring the overall
length and width of the fan base assembly cavities
that have the corrugated metal bottoms. The standard
depth of the cavity is 4 inches.
huMidiFiERS
Optional Steam humidifiers, when selected are provided
with dispersion equipment factory mounted inside the
air handling unit. The steam injection or generating
equipment, metering devices and sundries are shipped
loose with the unit. Humidifier manufacturer’s
installation, operation and maintenance information
is packaged with the respective humidifier. It is the
responsibility of the installing contractor(s) to make
use of the instructions and preserve same for turn-
over to the end user. All required steam supply piping,
condensate piping and wiring are the responsibility of
the installing contractor(s).
Summary of Contents for YORK SOLUTION LD09624
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