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Form: 036-22287-001 Rev. A (0602) Supersedes: Nothing Page 1 of 2

'HVFULSWLRQThe 2ZBD00470xxxx Bypass Damper as-sembly, consists of a round air valve, actua-tor and bypass wiring interface card mountedin the enclosure.

The Bypass Damper controls duct staticpressure to insure proper system airflow.The Bypass Damper is controlled by the Me-ridian System Zone Manager. The ZoneManager modulates the Bypass Damper inresponse to the duct static pressure basedon a signal received from a static pressuresensor located in the main system ductwork.

All Bypass Dampers are tested and certifiedin accordance with ARI standard 880. An ARIlabel is affixed to all units.

0RXQWLQJThe Bypass Damper Assembly should bemounted according to standard duct installa-tion practices with airflow direction as shownin the illustration above. After installation ofthe Bypass Damper in the ductwork, insula-tion should be applied around any remaininguninsulated surface on the air valve inlet and outlet. The Bypass Damper should be mounted so the control enclo-sure is positioned to the left or right side of the ductwork with the control enclosure in a vertical plane. Do notmount the Bypass Damper Assembly with the control enclosure on the top or bottom of the ductwork. Adequateclearance should be maintained between the control panel and any obstruction to allow for removal of the controlpanel cover and access to the controls.

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Technical Data 2ZBD00470XXX Bypass Damper

Actuator Air Damper Construction: Supply Power 24 Volt AC Damper Body 24 Ga. Galv. Steel

Power Consumption 3.4 VA Maximum Damper Blade Round -18 Ga. Galv. Steel

Operating Temperature 35F(2C) to 125F(52C) Damper Bearings Oil Impregnated Bronze

Operating Humidity 90% RH Non-Condensing Damper Seal Volara Type A Gasket

Leakage Less Than 1% @ 3 SP

Insulation Foil Faced Fiberglass

Inputs: Dimensions: Actuator Position Feedback Air Damper Model A B C

OE512-10 (10) 19.00 9.88 13.38

OE512-12 (12) 21.00 11.88 15.38

OE512-14 (14) 21.00 13.88 17.38

OE512-16 (16) 21.00 15.88 19.38WattMaster reserves the right to change specifications without notice

Three Year Warranty On Electronic Components One Year Warranty On Air Damper

1/2" Foil FacedInsulation

Actuator

Round DamperBlade Assembly

Control Enclosure

(Cover Removed)

AIRF

LOW AIRFLO

W

Bypass & Slave Interface

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Form: 036-22287-001 Rev. A (0602) Supersedes: Nothing Page 2 of 2

%\SDVV'DPSHU6L]LQJBecause the zones in a Meridian Systemare controlled using variable air volume, it isunlikely that all zones will be at design loadat the same time. This zoning allows forload diversity to be taken into account whensizing the central HVAC unit. This typically

will provide better comfort with a smallerHVAC unit than with the use of a constantvolume system. Use a load program to de-termine the individual zone loads. Becauseof zone diversity the HVAC unit should besized for the correct instantaneous peakload, not the sum of the peak loads aswould be the case when sizing a normalconstant volume unit system. The BypassDamper should be sized to provide for themaximum amount of air to be bypassed inthe system. This is typically 60 to 70% ofthe HVAC units rated capacity. These cal-culations will be used in selecting the ap-propriate Bypass Damper Size(s).

The Meridian Systems utilize a typical lowpressure duct design. To reduce noiseproblems, duct pressures should not ex-ceed 1 W.C..

Using the maximum acceptable velocity fora bypass duct (typically 1750-2250 FPM forminimal noise), find the smallest damperthat will deliver the required CFM as deter-mined by the load program.

Bypass Air Damper Selection Data 2ZBD00470XXX Bypass Damper

Bypass Air Damper Round Duct Size(Area Ft

2)

10(0.532)

12(0.769)

14(1.050)

16(1.375)

Velocity Through Bypass Air Damper

FPM

Airflow Through Bypass Air Damper - CFM

(PS inches W.C. w/ Air Damper Full Open)

750399

(0.01)

577

(0.02)

788

(0.01)

1031

(0.01)

1000532

(0.02)

769

(0.03)

1050

(0.02)

1375

(0.01)

1250665

(0.03)

961

(0.04)

1313

(0.03)

1718

(0.02)

1500798

(0.04)

1154

(0.05)

1575

0.04)

2062

(0.03)

1750931

(0.06)

1346

(0.06)

1838

(0.05)

2405

(0.04)

20001064

(0.07)

1538

(0.07)

2100

(0.07)

2749

(0.05)

22501197

(0.08)

1730

(0.08)

2363

(0.08)

3093

(0.06)York reserves the right to change specifications without notice

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When determining the bypass duct size, be sure to take into ac-count any transition fittings and their associated pressure drops.Locate the bypass duct velocity used in the duct design program in

the left hand column of the Bypass Damper Selection Data table.Move across the table and find the Bypass Damper size which willprovide the acceptable CFM to meet the bypass airflow require-ments.

1RWH Compare the Bypass Air Damper size selected

against the bypass duct size to determine if the next

size up or down will provide acceptable performance

without requiring a transition f itting.

Up to a maximum of two additional Bypass Dampers may beslaved together with the main Bypass Damper for large bypass

airflow requirements. This design should be reserved only forsituations when it is not practical to use a single large BypassDamper. The slaved valves should all be of the same size forproper control. Divide the total CFM by two or three depending onhow many bypass and slave dampers you will be using and sizeaccordingly.