16
3.0 Electrical Connections
Before proceeding with the electrical connections make certain that the volts, hertz, and
phase correspond to that specifi ed on the unit electrical nameplate. Use copper conduc-
tors only.
3.1 Electrical Service
Check to be sure the service provided by the utility is suffi cient to handle the additional load imposed
by this equipment. Most units with secondary heat exchangers will require a separate power source
and fi eld provided, interconnecting wires (see Section 3.5).
Remote condensers will typically require one power source. Glycol systems with fl uid coolers and
loose pump(s) typically require one power source for the fl uid cooler and will require one additional
source for single pump or two additional sources for dual pumps. Systems where the pump(s) are
mounted and piped integral to the fl uid cooler will usually require a single power source.
3.2 Nameplate Ratings
Refer to the unit’s electrical nameplate for electrical requirements. Minimum circuit ampacity (MCA)
also known as wire sizing amps, will dictate the minimum required wire gauge. Maximum overcur-
rent protection (MOP) device amps will dictate the maximum circuit breaker or fuse size.
3.3 Grounding
The unit cabinet must have an uninterrupted true earth ground. An electrical ground wire of ad-
equate size must be connected to the ground lug provided inside the unit’s main electrical box.
3.4 Voltage Tolerance
The supply voltage to the unit must be within tolerance: - 5% to + 10% for 208-230 voltage and
+ 10% for 460 volts. Phase to phase imbalance must not exceed 3%. 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.
Check the wiring connections in the unit control panel to ensure they are tight. Screw ter-
minals may become loose in transit. Tightening of wire connections is the responsibility of
the installing contractor.
3.5 Auxiliary Control Wiring
For secondary heat exchangers (condenser and fl uid coolers) connect two 18 gauge wires (mini-
mum size – good to 100 feet) 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 exchang-
ers 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 Data Temp and Modular Data Temp evaporator section has remote shutdown contacts. These
are intended for a fi eld supplied dry contact or switch to be wired across two terminals. When the
contact or switch opens, the control circuit power is interrupted and the unit shuts down (including
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