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7. Close the valve on the refrigerant manifold gauge set.
WARNING: If the system is charged from a vacuum, the preheating of the
compressor is not necessary. But if starting a compressor that has not
been charged from a vacuum, the crankcase heater must be energized
for a minimum of 12 hours to reduce the possibility of liquid slugging on
startup. Failure to energize the crankcase heater could result in
compressor damage.
NOTICE: A quick and easy way to run the fans and compressor is by using
the Mini-dap4, Menu I – Manual Control (Service Level). See the Mini-dap4
User Manual for details.
During manual control, all automatic control is disabled but the system safety
switches will remain functional.
Charging the Fixed Speed Compressor
Charging requires the unit the unit operation. Before turning the system ON to finish charging the circuit
1 and 2 make sure to check for voltage phasing. For more information on this refer to section 5.4
Voltage Phase Check.
WARNING: When working within the electrical enclosure or on any of the
electrical circuits, risk of electric shock must be avoided and can cause
injury or death. Always disconnect all electrical facility power from the unit
before working within.
If the unit is equipped with an optional disconnect switch, turn the disconnect switch to the ON position
to allow facility electrical power to the unit.
The unit Mini-dap4 controller may be turned ON (or OFF) by pressing the Power icon at the bottom left
corner of the main screen. The icon is green when the unit is ON and red when unit is OFF. Once
controller is turned ON there will be a 5 to 600 second start delay indicated by “Time before start: XXs”
on the display to allow the controller to complete a boot up process and conduct an internal self-test.
Before starting the system, the initial pre-charge process must be complete and make sure pressure
gauges and suction line temperature sensor are hooked up.
Use the Temp Setpoint under Menu B – Setpoints to force the circuit 1 compressor to start in the normal
operating mode. A call for cooling can artificially be created from the controller by setting the Temp
Setpoint to a value lower than the current ambient temperature in the space.
Example: Existing return air temperature (RAT) is 75F (23.9C), set the controller Temperature
Setpoint to 65F (18.3C). The compressor will start and run at a full speed.
If the unit is in OFFbyKEY position, hold the ESC key for 5 seconds to start the system via the controller.
Allow time for all fans to start and for the system to stabilize to room temperature. Bubbles in the sight
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