Retrotec Commercial 441 and 451 DucTester Manual do Utilizador descarregar pdf (Página 51)

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©Retrotec Inc. 2015

Step 2 – Prepare the ducts

□ Determine the Pressure Class

Use specified value. If not specified, use a

Pressure Class of 1 in WC except upstream of VAV

boxes, use 2 in WC. Use a positive test pressure

unless specified otherwise. Test pressure shall not

exceed the Pressure Class according to SMACNA

“HVAC Air Duct Leakage Test Manual”.

□ Measure duct area

□ – But not if using %

airhandler flow as pass/fail

criteria.

Select a limited section of duct for which the

estimated leakage will not exceed the capacity of

the test apparatus. Measure the duct surface area

in square feet. See Table 11 and Table 12.

□ Ensure sealing is complete

Ensure sealing materials have cured for the

prescribed time or at least 24 hours OR follow

manufacturer’s directions.

□ Blank off ductwork

Blank off and seal the tested ductwork by

inserting temporary plugs plates, sheets, balloons,

bags into intentional openings.

Step 3 – Connect DucTester to ducts

□ Attach 4 inch Flange to

ductwork.

□ Attach 4 inch collar on flex to

flange

□ Connect DucTester exhaust

to flex

□ Install Range 47 Flow Plug

Range 47 provides 52 to 206 CFM, which is

sufficient to test most duct runs.

Step 4 –DucTester tubing, control and power connections

□ Connect yellow and green

tubes between DucTester

and gauge

□ Connect blue tube to gauge

and to ducts using static

probe or connection on

flange

□ Plug in the Speed Control

Cable between DucTester

and Gauge

□ Plug in to power source

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Retrotec Commercial 441 and 451 DucTester Manual do Utilizador Página 51

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