10-2014 gForce User Manual ā 27
3.3 Grounding
The unit cabinet must have an uninterrupted true earth ground. An electrical ground
wire of adequate size must be connected to the ground lug provided inside the main
electrical box.
3.4 Voltage Tolerance
The supply voltage to the unit must be within 10% of the voltage indicated on the unit
electrical nameplate. The maximum allowable voltage phase to phase imbalance must
not exceed 3%. Voltage imbalance causes high amperage over one or several phases,
which in turn leads to overheating and possible damage. The local utility company
should be contacted for correction of improper line voltage. Deviation from voltage
ratings can cause premature failures and possibly void unit warranties.
WARNING:
Check the wiring connections in the unit control panel to
ensure they are tight. Screw terminals may become loose in transit.
Tightening of wiring connections is the responsibility of the installing
contractor.
3.5 Auxiliary Control Wiring
For secondary heat exchangers (condenser and fluid coolers) connect two 18 gauge
wires (minimum size ā good to 100 feet (30 m)) from the electrical box of the indoor
evaporator to the electrical box of the remote heat exchanger. Refer to the wiring
diagrams located in the electrical control panel of each unit. Follow the wiring diagrams
for each piece of equipment. On most remote heat exchangers the terminals will be
#39 and #40. All control wiring on Data Aire equipment is 24 VAC.
Condensing units (compressors mounted in the condenser) will typically require more
wires (refer to unit wiring diagrams).
3.6 Remote Shutdown
Every gForce Ultra unit has remote shutdown contacts. These are intended for a field
supplied dry contact or switch to be wired across two terminals. When the contactor or
switch opens, the control circuit power is interrupted and the unit shuts down, including
the control panel. The control circuit is 24 VAC and the field provided contact or switch
should have a minimum rating of 10 amps. Use field-supplied Class 1 wiring.
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