Carrier 48XL Routing Power Leads Into Unit, Connecting Ground Lead to Ground Screw

Table2- MaximumGas Flow Capacity*

NOMINAL		INTERNAL							LENGTH OF PIPE ft (m)'{"
IRON PIPE		DIAMETER	10	20	30	40	50	60	70	80	90	100	125	150	175	200
SIZE (IN.)		(IN.)	(3.0)	(6.1)	(9.1)	(12.1)	(15.2)	(18.3)	(21.3)	(24.4)	(27.4)	(30.5)	(38.1)	(45.7)	(53.3)	(61.0)
	1/2	.622	175	120	97	82	73	66	61	57	53	50	44	40	--	--
	3/4	.824	360	250	200	170	151	138	125	118	110	103	93	84	77	72
	1	1.049	680	465	375	320	285	260	240	220	205	195	175	160	145	135
1	- 1/4	1.380	1400	950	770	600	580	530	490	460	430	400	360	325	300	280
1	- 1/2	1.610	2100	1460	1180	990	900	810	750	690	650	620	550	500	460	430

*Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5-IN. W.C. (based on a 0.60 specific gravity gas). Refer to Table, NFPA 54/ANSI Z223,1.

1- This length includes an ordinary number of fittings.

ROUTING POWER LEADS INTO UNIT

Use only copper wire between disconnect and unit. The high voltage leads should be in a conduit until they enter the duct panel;

conduit termination at the duct panel must be watertight. Run the

high-voltage leads through the power entry knockout on the power entry side panel. See Fig. 5 and 6 for location and size. For

single-phase units, connect leads to the black and yellow wires.

CONNECTING GROUND LEAD TO GROUND SCREW

Connect the ground lead to the chassis using the ground screw on the control plate near the inducer switch (See Fig. 13).

ROUTING CONTROL POWER WIRES

For detailed instruction on the low voltage connections to the User Interface (UI), refer to the UI installation guide.

Form a drip-loop with the control leads before routing them into the unit. Route the low voltage control leads through grommeted,

low-voltage hole provided into unit (See Fig. 5 and 6). Connect user interface leads to unit control power leads as shown in Fig. 14.

The unit transformer supplies 24-v power for complete system

including accessory electrical heater. Transformer is factory wired for 230-v operation. If supply voltage is 208-v, rewire transformer

primary as described in Special Procedures for 208-v Operation section.

The furnace board is fused by a board-mounted automotive fuse

placed in series with transformer SEC1 and R circuit. The C circuit

of transformer circuit is referenced to chassis ground through a

printed circuit run at SEC2 and gas valve grounding wire. Check to

be sure control board is mounted securely using both

factory-installed screws.

ACCESSORY INSTALLATION

A. Outdoor Air Thermistor (OAT)

EQUIPMENT OPERATION HAZARD

The installation of an outdoor temperature sensor using the

Infinity control board OAT terminals is required. Many

Infinity features (auto humidity control, comfort rollback, ETC.) will be lost if the OAT is not connected.

For detailed mounting instructions for the OAT sensor,

please refer to TSTATXXSEN01-B installation instructions

(catalog no. 63TS-TAI3): Procedures 1 through 3.

The OAT input is used to supply outdoor temperature data for

system level functions and for temperature display on User

Interface (UI). Using two wires of the field-supplied thermostat wire cable, wire the ends of the two black OAT pigtails. Wire the

opposite ends of these two wires to the OAT provided with the UI. There is no polarity to be observed.

NOTE: Mis-wiring OAT inputs will not cause damage to either

Infinity control or thermistor. If the thermistor is wired incorrectly,

no reading will appear at UI. Re-wire thermistor correctly for normal operation.

B. Humidifier Connections

The furnace control board terminal marked HUM is provided for

low voltage (24-vac) control of a humidifier. No humidistat is required as UI monitors indoor humidity.

When commanded to operate humidifier, the unit control will

energize the HUM output to turn humidifier on and de-energize

HUM output to turn humidifier off. Wire HUM and COM

terminals directly to humidifier as shown in Fig. 14.

C. Electronic Air Cleaner

Electronic Air Cleaner terminals are provided on the Infinity

Control Board (EAC-I and EAC-2). While these terminals can be

used to power a 230V EAC, it is recommended that any EAC be

installed per the EAC installation instructions and connected

separately to a standard II5V or 230V outlet with an airflow sensor to control operation of the EAC.

SPECIAL PROCEDURES FOR 208-V OPERATION

Be sure unit disconnect switch is open.

Disconnect the black primary lead from the transformer. See unit wiring label (See Fig. 16 and 17).

Connect the black primary lead to the transformer terminal labeled 208-v.

12