Bryant 580G manual Ð Indoor Air Quality Sensor Conguration, D. Field Control Wiring

JUMPER CONNECTION

FOR VOLTAGE OUTPUT

JUMPER CONNECTION

FOR CURRENT OUTPUT

Fig. 12 Ð Indoor Air Quality Sensor Con®guration

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.

D. Field Control Wiring

Install an approved accessory thermostat. Control box dia- gram is shown in Fig. 14.

Thermostat Wiring

Install an approved accessory thermostat assembly (per cur- rent price pages) according to the installation instructions in- cluded with the accessory, or these instructions. Locate ther- mostat assembly on a solid wall in the conditioned space to sense average temperature.

Route thermostat cable or equivalent single leads of no. 18 AWG (American Wire Gage) colored wire from subbase terminals to low-voltage connections as shown on unit label wiring diagram and in Fig. 15.

NOTE: For wire runs up to 50 ft, use no. 18 AWG insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

Set heat anticipators settings to .1 for all voltages. Settings may be changed slightly to provide a greater degree of com- fort for a particular installation.

			LEGEND
EQUIP	Ð	Equipment	NEC	Ð	National Electrical Code
GND	Ð	Ground	TB	Ð	Terminal Block

NOTE: TB1 Maximum wire size is 500 MCM.

Fig. 13 Ð Field Power Wiring Connections

Operating voltage to compressor must be within voltage range indicated on unit nameplate. On 3-phase units, voltages be- tween phases must be balanced within 2% and the current must be balanced within 10%.

Use the formula in Table 3 to determine the percentage 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 208/230-v units, transformer no. 1 is wired for 230-v. If 208/230-v unit is to be run with 208-v power supply, the trans- former must be rewired as follows:

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.

LEGEND

CÐ Compressor/Contactor

CB	Ð Circuit Breaker
DIP	Ð Dual In-Line Package
FU	Ð Fuse
HR	Ð Heater Relay
IF	Ð Indoor Fan
OF	Ð Outdoor Fan
PEC	Ð Power Exhaust Controller
TB	Ð Terminal Block

TRAN Ð Transformer

Fig. 14 Ð Control Box Diagram

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