Carrier 48TJ016-028 specifications VO Ltag E, Gas, Tbi

Step 8 --Install Gas Piping --Unit is equipped for use with natured gas. Installation must conform with loc_d building codes or. in the absence of loc_d codes, with the National Fuel Gas Code, ANSI Z223.1.

Install field-supplied manu_d gas shutoff valve with a lh-in. NPT pressme tap for test gage connection at unit. Field gas pip- ing must include sediment trap and union. See Fig. 13.

Tlansformer no. 1 is wired for 230-v unit. If 208/230-v unit

is to be run with 208-v power supply, the transformer must be rewired as follows:

1.Remove cap fiom red (208 v) wire.

2.Remove cap from orange (230 v) spliced wire.

3.Replace orange wire with led wire.

4.Recap both wires.

Do not pressure test gas supply while connected to unit. Always disconnect union before servicing. Exceeding maximum manifold pressure may cause explosion and injury.

tion must not be less than 5.5 in. wg or greater than

IIMPORTANT: Natural gas pressure at unit gas connec-

13.5in. wg.

Size gas-supply piping for 0.5-in. wg maximum pressure drop. Do not use supply pipe sm_dler than unit gas connection.

MANUAL SHUTOFF
(FIELD SUPPLIED) _	FT'I
_ _	GAS

PRESSURE TAP (1/8" NPT PLUG)

UNIT _
o&	• ---- SEDIMENTTRAP

Fig. 13 --Field Gas Piping

Step 9 --Make Electrical Connections

FIELD POWER SUPPLY- Unit is factory wiled for volt- age shown on nameplate.

When inst_dling units, provide a disconnect per NEC (Na- tional Electrical Code) of adequate size (Table 5).

All field wiring must comply with NEC and local requirements.

Route power ground lines through control box end panel or unit basepan (see Fig. 4 and 5) to connections as shown on unit wiring diagram and Fig. 14.

The correct power phasing is critical in the operation of the scroll compressol,s. An incorrect phasing will cause the compressor to rotate in the wrong direction. This may lead to premature compressor failure.

The unit must be electrically grounded in accor&mce with local codes and NEC ANSI/NFPA 70 (National Fire Pro-

tection Association) to protect against fire and electric shock.

Field wiring must confirm to temperature limitations for type "T" wire. All field wiring must comply with NEC and lo- cal requirements.

Be certain unused wires ale capped. Failure to do so may &_mage the transformers.

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

Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause &Lmage to electrical components.

FIELD CONTROL WIRING -- Install a Carrier-approved accessory thermostat assembly according to installation in- structions included with accessory. Ix)cate thermostat assembly on a solid interior wall in the conditioned space to sense aver- age temperature.

Route thermostat cable or equivalent single leads of colored wire from subbase termimds through conduit in unit 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 (American Wire Gage) 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 at

the thermostat and will require a junction box and splice at the thermostat.

Set heat anticipator settings as follows:

VO LTAG E	W 1	W2
208/230,575	0.98	0.44
460	0.80	0.44

Settings may be changed slightly to provide a greater degree of comfort for a particuku installation.

----1					TBI
II			FIELD	i	_
i_II	III	I III	II_
[			POWER	I	_
=U.l	.......		SUP_PLY
z z

i

		I-IN
	l	EQUIP GND
	I
..............	]
		LEGEND
EQUIP	--	Equipment
GND	--	Ground
NEC	--	National Electrical Code
TB	--	Terminal Block

NOTE: The maximum wire size for TB1 is 2/0.

Fig. 14- Field Power Wiring Connections

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