Installation, Operation and Maintenance Manual
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The local utility company should be contacted for correction if improper line voltage exists. Deviation from ratings
can cause premature failures and possibly void unit warranty. For three-phase units, only three power wires and a
proper earth ground are required. A neutral is not required at the unit input connections.
Standard Electrical Connections
The electrical line power interface connection point may be a standard power distribution block or an optional
disconnect switch.
If equipped with an optional dual power source (i.e., primary and secondary high voltage and/or primary and
secondary low voltage) the entrances are all located on the electrical control panel. All electrical components,
including contactors, relays and control transformers are pre-wired and contained in a unit-mounted electrical
control panel. The control circuit voltage is 24 VAC.
Controllers
5.7.1
Floor Mounted Units
Floor mounted units are equipped with a microprocessor based dap4 controller and includes a dap4touch graphic
display for easy operation and setting adjustments. Equipment supplied before June 2019 have a backlit liquid
crystal display (LCD) with six keys (buttons). The dap4 controller includes the unit control and displays operating
functional information and service diagnostics. The controller allows recall and display of the high and low
temperature, high and low humidity, current percent of capacity and average percent of capacity for chilled water
valve, compressor, reheat, humidification, dehumidification, component runtimes for fan motor(s), reheat,
humidification, and dehumidification (if applicable).
See the separate dap4 User Manual for detailed programming and operating instructions.
5.7.2
Ceiling Mounted Units
Ceiling units are equipped with a microprocessor based Mini-dap4 controller. The Mini-dap4 controller system is
comprised of two (2) major components: a wall mount display and a unit mounted controller. A combination
temperature and humidity sensor is included with each system and is unit mounted but this combination sensor
can also be remote mounted as an option. The wall mount display includes a remote dap4touch display. Equipment
supplied before June 2019 has a backlit liquid crystal display (LCD) with six keys (buttons). The controller is mounted
on the ceiling mounted evaporator section and connected to the remote
display via a special “telephone like” cable
which is included with the system. If touch display is used, a different type of display cable is provided. An optional
remote mounted temperature and humidity sensor is a separate wall mounted device which is to be mounted at
