Start-Up And Test Procedure; Check That All Wiring Is Correct; Check For Correct Phasing; Fan Speed Adjustment - Compu-aire System 2100 Series Installation And Operation Manual

15 START-UP AND TEST PROCEDURE

15.1 Check that ALL WIRING IS CORRECT

To perform this test the unit must be turn OFF. Check that properly sized fuses are installed in the
disconnect switch. Correct fuse size and minimum circuit ampacity are listed on the unit
nameplate. Now, check the wiring connections in the Main Control Panel to see if they are tight.
It is best that this be checked prior to operating the machine. After checking, close the Main
Control Panel cover and proceed as follows:
Microprocessor Control Panel – With the system switch in the "OFF" position, apply power to the
unit. The "Power ON" light should illuminate.

15.2 Check for Correct Phasing

The equipment should now be checked for correct phasing required to make the blower motor
turn in the correct directions. For this test it is necessary to open the right side doors of the unit
to observe the blower and blower motor. Now, momentarily switch the system switch to the
"ON" position and then back to "OFF". The blower motor with have started and it is therefore
possible to determine rotation. On Compu-Aire units, the blower should be rotating in a
CLOCKWISE direction in downflow units and COUNTERCLOCKWISE direction in upflow units,
looking in the right side of the unit. Heaters and humidifiers are not affected by phasing.

15.3 Fan Speed Adjustment

Adjustment of the air flow maybe desired. The air flow can be readily adjusted with the variable
pitch pulley provided on the blower motors. After the unit has been started and the air flow
properly adjusted, check the blower motor current to ensure is increased, the blower motor
current should be checked. If a field adjustment is made, the motor should run for at least one
hour at maximum design room temperature to see if motor trips on internal overload. For
proper motors amps refer to the name plate.
15.4 No air flow & Clogged filter adjustment
The "No Air Flow" light and alarm should be checked prior to the completion of the installation.
Although the control adjusted at the factory, varying local conditions make it impossible to
provide accurate pressure adjustments.
To check the filter pressure switch, let the unit operate on cooling for about 30 minutes. This
will allow the evaporator coil surface to become wet. The air pressure differential switch is
provided with adjustable knob. Set the knob to desire pressure drop for dirty filter and verify the
Dirty Filter alarm. With the unit cooling and filters in place, block off approximately 75% of the
air intake. If the sensing device is correctly adjusted, the
energize; the sensing device should have just turned on the alarm at the 75% blocked inlet
condition. An Air Flow Sail switch is also provided at the discharge side of the blower and will
activate the No Air Flow malfunction light and alarm.
"Clogged Filter" alarm should
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