Install Instructions

VALIDATING PROPER SYSTEM OPERATION

For each dryer connected to the duct system, acquire the approved Back Pressure Range from the Dryer manufacturer. Turn on

all other air consuming devices in the spaces where the dryers are located. Follow the Back Pressure measuring method defined

below. Cycle all dryers and all combination of dryers to confirm the dryer manufacturer’s approved back pressure range is main-

tained. If dryer manufacturers maximum allowable back pressure data is not available adjust dryer booster fan speed so that mea-

sured back pressure does not exceed 0.40” w.c. for any connected dryer.

MEASURING AND VERIFYING ACTUAL SYSTEM BACK PRESSURE

Back pressure should be measured with an empty dryer, a clean lint screen and with the dryer operating

in the Air Only

cycle (no heat)

A. Dryer should be empty and running on

Air Only cycle (no heat)

B. 12” minimum section on straight duct - measure back pressure from the center

C. To vent system

D. Verify reading on Pressure Gauge / Manometer is within Dryer Manufacturer’s allowable back pressure range.

MAINTENANCE

Reference Dryer Manufacturer’s recommendations for Dryer exhaust duct cleaning and maintenance. Depending on use, but at

least every 2 years, we recommend cleaning the dryer exhaust vent. On an annual basis make sure that exhaust hood flapper or

back draft damper is clean of lint and moves freely. The CDB8 drive and cooling fan motor are maintenance free. Blow or vacuum

any accumulated dust and lint away from drive and cooling fan motor enclosure.

HOW TO OBTAIN SERVICE ASSISTANCE

1. If you have any questions about your CDB8 or if it requires adjustment or repair, contact your installer, contractor or

service agency.

2. If you require technical information contact Tjernlund Products, Inc. at 1-800-255-4208 with the following information.

1. Model of the Exhaust Fan.

2. Name and address of installer and any service agency who performed work on the system.

3. Date of original installation and dates any service work was performed.

4. Details of the problem as you can best describe them.