FloAire Direct Expansion Coil Modules - Manual (Page 12)

12
OPERATION
Prior to starting up or operating the DX module, check all fasteners for tightness. Ensure that the coil is
clean and that the interior of the module is free of loose debris. Also, check the drain pan for proper
drainage. This will guarantee proper operation during the cooling season.
Start Up
Special Tools Required
•
AC Voltage Meter
•
Amperage Meter
•
Standard Hand Tools
Start Up Procedure
1. Remove the access door and check all electrical connections for tightness and continuity.
2. Inspect the air-stream for obstructions.
3. Compare the supplied voltage with the unit’s nameplate voltage. If this does not match, correct
the problem.
4. Set the thermostat to a set-point cooler than the entering air temperature for start-up purposes.
The cooling circuit will be energized when the entering air temperature is hotter than the
thermostat set-point.
5. Install the access door and apply power to the unit. If the entering air temperature is hotter than
the thermostat set-point, the cooling circuit will be energized the first stage of the compressor
should turn on.
6. Locate the sight glass and observe the refrigerant flow for a few minutes. This run time will allow
the unit to stabilize. If the line has is foaming, a large quantity of bubbles, you may need to add
charge to your unit.
7. Adjust the thermostat so that the second stage turns on, a difference of 10°F (typical) is required .
Repeat step 6.
8. Set the thermostat back to the desired cooling temperature (typically about 75°F-85°F).
Remember, the cooling circuit will only be energized when the entering air temperature is higher
than the set-points.