Installation, Operation and Maintenance Manual
Page
34
of
100
Glycol systems with fluid coolers and loose pump(s) typically require one power source for the fluid cooler and will
require one additional source for a single pump or two additional sources for dual pumps. Systems where the
pump(s) are mounted and piped integral to the fluid cooler will usually require a single power source.
Nameplate Ratings
The unit nameplate is located inside the cabinet on the outside of the electrical control panel door. The nameplate
includes Minimum Circuit Ampacity (MCA) also known as wire sizing amps which indicates the minimum required
wire gauge. The Maximum Overcurrent Protection (MOP) device amps indicate the maximum circuit breaker or fuse
size required to protect the system. Other protection devices must be verified by the installing contactor to be
compliant with the product UL listing.
The facility main distribution panel which provides electrical service to the Data Aire equipment must be provided
with a manual fused disconnect switch or circuit breaker per local and national electrical codes.
NOTICE
Do not mount a field supplied manual fused disconnect switch or
circuit breaker to the surface of the equipment.
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 panel. See example of an electrical ground lug
below.
Figure 9 - Typical Grounding Lug
Voltage Tolerance
The supply voltage to the unit must be within tolerance:
Nominal
Voltage (VAC)
Utilization Voltage (VAC)
208
191 to 218
230
211 to 241
277
254 to 291
460
422 to 483
575
527 to 604
Utilization Voltage is the voltage at the equipment load or available voltage at the terminals of the equipment.
Phase to phase imbalance must not exceed 3%.