Bryant 619E manual Application Data, Maximum Line Lengths, Maximum Lift Ð

APPLICATION DATA (cont)

9.Metering devices

a.009, 012 units Ð The 009 and 012 units have capillary tubes for refrigerant metering located in the outdoor con- densing unit.

b.018, 024 units Ð The 018, 024 units use a piston-type metering device located in the indoor unit.

NOTE: All 538A, 538C, 538D (018, 024) duct-free split sys- tems use Chattleff style AccuRater pistons. DO NOT mix piston types. All 538D009, 012 systems use Aeroquip type pistons. See Long-Lines Applications section on page 20 for changes in piston sizes due to long lines.

10.Drain connections

Install drains to meet local sanitation codes. If adequate gravity drainage cannot be provided, unit should be equipped with accessory condensate pump. High wall fan coil unit condensate pumps have a 10 ft lift capability above the condensate pan level.

See base unit dimensional drawings on pages 13 and 14 for fan coil unit drain locations and sizes.

NOTE: High wall fan coil units have internal condensate traps.

Drain connections may be routed through alternate loca- tions on most fan coils. See base unit dimensional drawings on pages 13 and 14 for possible alternate locations.

11.Refrigerant lines

a. General refrigerant line sizing:

1)All charges, line sizing, and capacities are based on runs of 25 ft. For runs over 25 ft, consult long-lines section on page 20 for proper line sizing, charge, and AccuRater refrigerant metering device sizing.

NOTE: For runs less than 25 ft, some of the charge may need to be removed to obtain the correct system super- heat. The minimum line length should be 8 ft.

MAXIMUM LINE LENGTHS

		MAXIMUM LIFT Ð	MAXIMUM LIFT Ð
	MAXIMUM	FAN COIL	FAN COIL
UNIT	EQUIVALENT	BELOW	ABOVE
	FT	CONDENSING	CONDENSING
		UNIT	UNIT
538A, 538D018,024	200	150	65
538D, 538D009	35	35	16
538C, 538D012	49	35	16*
538S	50	30²	30²

*This changes to 25 ft with addition of accessory crankcase heater. ²Maximum distance permitted is 30 ft from lowest system component to

highest system component.

2)Refrigerant lines should not be buried in the ground. If it is necessary to bury the lines, not more than 36 in. should be buried. Provide a minimum 6-in. ver- tical rise to the service valves to prevent refrigerant migration.

3)The vapor line must be insulated. Use a minimum of 1¤2-in. thick insulation. Closed-cell insulation is rec- ommended in all long-line (over 25 ft) applications.

4)Special consideration should be given to isolating interconnecting tubing from the building structure. Isolate the tubing so that vibration or noise is not transmitted into the structure.

b.538C,D009,012 units

1)These units are shipped with a charge of R-22 refrig- erant. Check the charge using the superheat

method. Since all refrigerant lines are on the low side of the system, it is not normally necessary to add or remove charge.

2)These units have mixed-phase refrigerant ¯ow in the liquid line. DO NOT install a ®lter drier in the liquid line. The liquid line must be insulated.

3)No line size changes should be made on 009, 012 units.

c.538A,D018, 024 units

1)These units are shipped with a charge of R-22 refrig- erant. See System Piston Guide and Refrigerant Charges tables on page 21 for system charges. Add additional charge by weight as necessary and check the charge with a superheat calculator.

2)For these units, install the ®lter drier provided with the unit in the liquid line. Use of a ®eld-supplied mois- ture indicator is also recommended.

d.538S units

1)Outdoor units are shipped with the charges listed in the Speci®cations Ð 538S Condensing Units table on page 8. To determine if additional charge is re- quired, add all charges listed in fan coil unit speci®- cations table(s) in the Product Data literature for your system (per circuit). The sum of the charges listed is the system circuit charge required based on 25 ft of line.

2)For the 538S units, ®lter driers are provided in the unit.

3)Vapor supply lines on all 538S units should be 5¤8 in. only. DO NOT resize vapor supply lines for additional length.

4)When sizing vapor return line, determine line length by ®nding equivalent ft of tubing. Equivalent line lengths equal the linear length (measured length) of the interconnecting vapor return tubing plus losses due to elbows (see Fitting Loss in Equivalent Ft For Elbows table on page 21). If the number of elbows is not yet known, assume 50% additional length for equivalent length. In determining line size, be sure oil can be properly returned to the compressor. Contact your local representative for oil return recommenda- tions as necessary. For line lengths from 25 to 50 ft, no special tubing requirements are normally re- quired. Adjust charge to required amount by adding charge per subcooling method. Refer to 538S base unit installation instructions for charging details.

e.Long-lines applications, 538A,D018,024 units:

1)Liquid lines on all 538A,D018,024 units should be 3¤8 in. only. DO NOT resize liquid lines for additional length.

2)When sizing vapor line, determine line length by ®nd- ing equivalent ft of pipe. Equivalent line lengths equal the linear length (measured length) of the in- terconnecting vapor tubing plus losses due to elbows (see Fitting Loss in Equivalent Ft For Elbows table on page 21). If the number of elbows is not yet known, assume 50% additional length for equivalent length. In determining line size, be sure oil can be properly returned to the compressor. Consult your lo- cal representative for proper oil return recommenda- tions as necessary. For line lengths from 15 to 49 ft, no special piping requirements are normally required. Adjust charge to required amount by add- ing charge per Step l) on page 23 and checking superheat.

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