![Fig. 28 — Field Power Wiring Connections](/images/new-backgrounds/33765/3376585x1.webp)
Routing Through Bottom of Unit — If wiring is brought in through bottom of unit, use
Use strain relief going into control box through
Install conduit connector in unit basepan as shown in Fig.
Routing Through Side of Unit — Route power wiring in
Use
Bring
After wiring is in control box, make connection to proper terminals on terminal blocks (see Field Control Wiring section below).
IMPORTANT: The VAV (variable air volume) units use variable frequency drives, which generate, use and can radiate radio frequency energy. If units are not installed and used in accordance with these instructions, they may cause radio interference. They have been tested and found to comply with limits of a Class A computing device as defined by FCC (Federal Communications Commission) regulations, Subpart J of Part 15, which are designed to provide reasonable protection against such interference when operated in a commercial environment.
The unit must be electrically grounded in accordance with local codes and NEC ANSI/NFPA 70 (National Fire Pro- tection Association).
Affix crankcase heater sticker (located in the installers pack- et) to unit disconnect switch.
Voltage to compressor terminals during compressor opera- tion must be within the voltage range indicated on the unit nameplate. On
Use the formula in Tables 7 and 8 to determine the percent- age of voltage imbalance.
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.
Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components.
On
1.Remove cap from red (208 v) wire.
2.Remove cap from spliced orange (230 v) wire. Discon- nect orange wire from black unit power wire.
3.Cap orange wire.
4.Splice red wire and black unit power wire. Cap wires.
IMPORTANT: BE CERTAIN UNUSED WIRES ARE CAPPED. Failure to do so may damage the transformers.
FIELD CONTROL WIRING — Install either a Carrier- approved thermostat or a CCN (Carrier Comfort Network) compatible temperature sensor. Thermostats are used on CV (constant volume) units only. Control box diagrams are shown in Fig.
LEGEND
GND — Ground
NEC — National Electrical Code
TB — Terminal Block
Fig. 28 — Field Power Wiring Connections
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