PASCALS:
This is the metric measure of pressure. One pascal is a very small amount of pressure.
Typical sea level air pressure is about 100,000 Pascals. (100 Pa = 0.402 "WC)
PSU:
Power Supply Unit. Usually transforms power from 115VAC to 24VDC in our units.
PWM:
Pulse Width Modulation
is used for controlling the amplitude of digital signals in order to control
motor speed or other devices.
TARGET:
Also know as Setpoint is the desired value that a control system is working to achieve.
VA:
Volt-ampere (VA) is a measurement of power in a direct current (DC) electrical circuit 1 VA = 1W
VAC:
Volts Alternating Current.
VDC:
Volts Direct Current.
W.C.:
Water Column, a colum of water is used to measure the pressure in an area.
:
Whole House Fan a ventilation system intended for cooling the entire house by moving cool air.
TROUBLE SHOOTING
Before servicing your Make-Up Air Unit, turn off power to it at your
home’s electrical panel to reduce the risk of electrical shock, injury,
fire, and/or circuit board damage.
If you encounter problems with the unit, please take a few minutes to run through the following
troubleshooting procedures
before calling
f or technical support.
The Make-Up Air unit is controlled with an online web interface which can be accessed from a computer
see
to access the MUA unit control interface.
NOTE: A “kinked” CAT5E Cable may cause a failure to connect to the router or the fan to not start.
Use another cable to rule out a cable issue before proceeding.
A re-settable circuit breaker is located on the Fan-mounted electrical box to protect circuit boards from power
surges. In the case of a power surge, this breaker can be reset by simply pushing the button back in.
Symptom: Control Interface works but Fan Unit does not start
Possible causes: No mode selected, no power to fan unit or kinked Ethernet Cable
Suggestion 1: Select “Manual Mode” in the interface and move the fan speed slider.
Suggestion 2: Check power (115VAC) at the electrical outlet, inside the fan’s electrical box wiring at
the Motor wiring connectors (115VAC)
Suggestion 3: Check the re-settable circuit breaker on fan’s electrical box.
Suggestion 4: Check for pwm (control 0-24VDC, 80Hz PWM) signal at fan box RJ45 connections.
Symptom: Control Interface works but Door does not open, but Fan starts
Possible causes: No Mode selected, no power to damper actuator, or damper shaft loose.
Suggestion 1: Select “Manual Mode” in the interface and click the Damper Configuration button.
Suggestion 2: Operate door(s) manually using the
Actuator Clutch
. Verify that the Actuator rotates with
the door shaft and that the shaft rotates with the door.
Suggestion 3: Check for 24VDC at the actuator(s) harness, inside the actuator and in the control box
NOTE: IN NORMAL OPERATION THE MAKE-UP AIR UNIT COMES ON WITHIN A MOMENT AND MAY TAKE
SEVERAL MINUTES TO SHUT OFF (SEE THE COUNTER TELLING YOU HOW LONG).
NOTE: THE ACTUATOR OPERATION CAN BE REVERSED BY SWITCHING THE DIRECTIONAL SWITCH
© AirScape MUA-IOM, July 2022, All Rights Reserved.
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