Carrier 48XL Filtersize, in.mm, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900

	Table 6	- Heating	Inputs
HEATING INPUT(BTU/HR)*	GAS	SUPPLY	PRESSURE (IN. W.C.)	MANIFOLD PRESSURE (IN. W.C.)
	NUMBER OF		Natural	Natural
	ORIFICES

High Stage	Low Stage
40,000	26,000
60,000	39,000
90,000	58,500
115,000	75,000
130,000	84,500

*Cubic ft of natural gas per hour for gas pressures Table 6.2 (b) NPFA 54 / ANSI Z223.1.

	Min	Max	High Stage	Low Stage
2	4.0	13.0	3.2-3.8	1.4	-	2.0
3	4.0	13.0	3.2-3.8	1.4	-	2.0
3	4.0	13.0	3.2-3.8	1.4	_ 2.0
3	4.0	13.0	3.2-3.8	1.4	_ 2.0
3	4.0	13.0	3.2-3.8	1.4	_ 2.0

of .5 psig (14 IN. W.C.) or less and a pressure drop of .5 IN. W.C. (based on a .60 specific gravity gas). Ref:

					Table	7 - ECM	Wet	Coil Pressure		Drop (IN.	W.C.)
UNIT							STANDARD		CFM (SCFM)
SIZE	600	700	800	900	1000	1100	1200	1300	1400	1500	1600	1700	1800	1900	2000	2100
024	0.005	0.007	0.010	0.012	0.015
030		0.007	0.010	0.012	0.015	0.018	0.021	0.024
036				0.019	0.023	0.027	0.032	0.037	0.042	0.047
042					0.014	0.017	0.020	0.024	0.027	0.031	0.035	0.039	0.043
O48							0.027	0.032	0.036	0.041	0.046	0.052	0.057	0.063	0.068
060										0.029	0.032	0.036	0.040	0.045	0.049	0.053

						Table 8 -	Filter	Pressure Drop Table (IN.				W.C.)
FILTERSIZE										CFM
in.(mm)	500	600	700	800	900	1000	1100	1200	1300	1400	1500	1600	1700	1800	1900	2000	2100	2200	2300
20X20X1	0.05	0.07	0.08	0.1	0.12	0.13	0.14	0.15	...........
(508x508x25)
24X30X1	....				0.05	0.6	0.07	0.07	0.08	0.09	0.1	........
(610x762x25)
24X36X1	.......							0.06	0.07	0.07	0.08	0.09	0.09	0.10	0.11	0.12	0.13	0.14	0.14
(610x914x25)

IMPORTANT: When evaluating the refrigerant charge, an

indicated adjustment to the specified factory charge must always be

very minimal. If a substantial adjustment is indicated, an abnormal

condition exists somewhere in the cooling system, such as

insufficient airflow across either coil or both coils.

REFRIGERANT CHARGE

The amount of refrigerant charge is listed on the unit rating plate

and/or the physical data table. Refer to the Refrigeration Service

Techniques Manual, Refrigerants Section.

NO CHARGE

Check for leak. Use standard evacuating techniques. After

evacuating system, weigh in the specified amount of refrigerant (refer to system rating plate).

LOW CHARGE COOLING

Use Cooling Charging Chart (Fig. 23). Vary refrigerant until the

conditions of the chart are met. Note that charging charts are

different from type normally used. Charts are based on charging

the units to correct subcooling for the various operating conditions.

Accurate pressure gauge and temperature sensing devices are

required. Connect the pressure gauge to the service port on the

suction line. Mount the temperature sensing device on the suction line and insulate it so that the outdoor ambient does not affect the

reading. Indoor air CFM must be within the normal operating range of the unit.

TO USE COOLING CHARGING CHARTS

Take the liquid line temperature and read the manifold pressure gauges.

Refer to the chart to determine what the liquid line temperature

should be.
NOTE:	If the problem causing		the inaccurate		readings	is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
NON-COMMUNICATING		EMERGENCY		COOLING		/
HEATING	MODE: 4-WIRE THERMOSTAT
This mode	of operation	is provided	only in the	case	where the	UI
has failed	or is otherwise	unavailable.	If communications		cannot	be

established with the UI, the Infinity furnace board will enable the

standard thermostat input terminals to allow simple thermostatic control of the 48XL unit.

For control with a standard thermostat, disconnect the ABCD

connectors from both control boards and using No. 18 AWG

color-coded, insulated type 90°C minimum or equivalent wire,

make the connections between the standard thermostat, the furnace

board, and the HP/AC board per Fig. 22. Recommend the use of

interconnecting wire with 105C, 600V, 2/64" insulation.

The Infinity control will respond to cooling and heating demands

with the maximum safe airflow based on gas furnace output and unit cooling capacity.

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