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INSTALLATION INSTRUCTIONS

69-1518-2

Static Pressure Regulating Damper

(SPRD)

APPLICATION

The Static Pressure Regulating Damper (SPRD) is a

round or rectangular single-blade barometric relief

damper. It is a mechanical damper with no electrical

connections. The blade has a counter-balance weighted

arm that can be adjusted to open when necessary. It is

recommended for use on zone damper systems up to.5

in. static pressure and up to 2000 cfm. Systems above

2000 cfm may require use of the SPC static pressure

control and MARD damper.

The SPRD is used on zoned systems when the

automatic closing of zone dampers can create an

excessive increase in the air pressure and velocity

through the duct system. This increase can reduce the

volume of air through the air handler and cause it to trip

on high limit or to create ice on the coil.

The SPRD automatically opens as the air pressure in the

duct system increases, and ducts the air into the return or

dump zone. Both the position of the counterweight and

the swing of the arm can be adjusted to allow the SPRD

to open when necessary. See Fig. 1 and 2 for SPRD

dimensions.

The counterweight arm assembly and counterweight only

are available as replacement parts. See Fig. 3.

INSTALLATION

When Installing This Product…

1.Read these instructions carefully. Failure to follow

them could cause a hazardous condition.

2.Check that all components are included. The

SPRD package includes: SPRD damper, counter-

weight arm assembly and installation instructions.

3.Check the ratings given in the instructions and on

the product to make sure the product is suitable for

your application.

4.Installer must be a trained, experienced service

technician.

5.After installation is complete, check out the product

operation as provided in these instructions.

Selecting Damper Size

1.Size the bypass damper by subtracting the cfm of

the smallest zone from the cfm of the system.

2.Consult Table 1 to determine the correct rectangu-

lar or round SPRD to use.

3.Alternately, calculate the bypass damper size using

a duct-sizing calculator. Use.25 in. for a bypass

zone and.1 in. for a dump zone.

Table 1. SPRD Damper Sizing.

RectangularRecommended cfmRoundRecommended cfm

12 x 810007300

12 x 1012008400

12 x 1214009600

20 x 8160010750

20 x 102000121200

20 x 123000141800

——162400

Produktspecifikationer