Retrotec DucTester 341 - Manual (Page 2)

Page 2 of 4
Step 3: Connect gauge & fan
□
Insert blue tube into the
supply register closest to
the air handler.
□
Plug in the power adapter.
Blue light indicates that
the power is connected.
□
Connect yellow and green
tubes to matching color
ports on fan. DO NOT
connect the Speed Control
Cable yet because it will
disable the knob and it is
important to experience
manual operation first.
□
Connect Flex Duct to fan inlet. The negative pressure
will improve the seals at the registers.
Step 2: Connect to ducts (cont’d)
□
Attach the Flange
to main return or
air handler cabinet.
Ensure filter has been
removed.
□
Attach Flex Duct to
the collar on the
Flange.
□
Install Range Plug 74 to start,
as most systems can be tested
on this Range Configuration.
29 47 74
□
Whenever a Range Plug is changed, make sure the
gauge shows the correct Range Plug in Step 4.
Step 2: Connect to ducts (cont’d)
Use smaller Range Plug numbers for tighter ducts,
and larger numbers for leakier ducts.
If Codes require you to pressurize, pass the test in
the depressurize direction first then connect the
Flex Duct to fan exhaust in order to pressurize. All
other connections remain the same.
pressurize
Inlet
airflow
Exhaust
Inlet
Exhaust
depressurize
airflow