Retrotec DucTester 200 Series Residential Applications - Manual (Page 79)

Page 79 of 91
©Retrotec Inc. 2015
Appendix D: Troubleshooting
Occasionally simple problems do occur with a DucTester system. If the problem is described in any of
the following sections, follow the steps to attempt to resolve the problem. If the problem persists,
contact
[email protected] .
“TOO LOW” appears on display:
Backpressure refers to the pressure that the DucTester fan works against while running. Under most
testing conditions, backpressure is not a concern. If the backpressure is too great, the gauge will
automatically sense it and display "TOO Low" or “ --------“, indicating the fan pressure signal is too low
compared to the pressure the fan is working against. Changing to a more restrictive Range
Configuration will solve this problem.
Gauge “Flow” reading does not change? Turn off [@ Pressure]
When the measured flow or fan pressure does not increase as fan speed increases the gauge has likely
been set to calculate a value for
[@ Pressure] . To have the gauge show the actual measured flow at
the current “PrA”, simply press [@ Pressure] until there is no @ symbol next to the flow reading.
If [@ Pressure] is active, the gauge calculates a reading for flow at the test pressure, no matter what
the actual “PrA” reads. Therefore, regardless of fan speed, the measured flow will appear relatively
unchanging.
Fan does not run
Make sure the power light is on and the power switch is set to “1”. If the yellow Speed Control Cable
(Ethernet-style) has been connected previously to a gauge, the Speed Control Knob must be turned off
and then on again. This is a fail-safe feature so the fan does not go on unless you want it to.
Alternatively, turning the power switch off and back on will activate the Speed Control Knob as long as
the Speed Control Cable is not connected.
Checking the DucTester flows
Set the gauge to Pressure on both channels using the [Mode] key.
Establish a test pressure of at least 25 Pa in a box or duct with flex duct connected to the DucTester fan
and using the manual Speed Control Knob to pressurize. Disconnect the blue tube and connect it to the
yellow port on the gauge. “PrB” should now read the same 25 Pa. If higher by a significant amount,
then Channel A is leaking, but if lower then Channel B is leaking.
With the Flex Duct removed, set the fan to full speed. “PrB” should read about 200 Pa. If the value is a
lot lower, Channel B is leaking. Connect the blue tube to “Input A” on the DM-2, and “Ref B” on the fan.
(Yellow tube is disconnected.) Channel A should read about 200 Pa.
Fixing the Fan Top (for Model 200)
Occasionally, it is possible for the Fan Pressure tubes, located inside the Fan Top, to become blocked,
pinched, or disconnected. This will prevent the gauge from reading changes in Fan Pressure when the
fan speed changes.
The Fan Top for the Model 200 refers to the two mounted red plates attached to the sides of the fan.
Attached behind them are Printed Circuit Boards (PCBs). For this section, we will refer to the Control