Bryant 619E manual Change in Indoor Unit Piston Size For Elevation, Horizontal Conguration, Fcu

APPLICATION DATA (cont)

e)Changes in piston size Ð The metering device for a long-line application must be adjusted to compen- sate for the frictional losses due to the long refriger- ant lines, refrigerant lines accessories, and indoor coil above or below the outdoor unit. The AccuRater refrigerant metering device piston may need to be changed to provide this adjustment. The AccuRater piston should be changed for the indoor unit depending upon system con®guration and line length. Use the Change in Indoor Unit Piston Size El- evation table on next page to determine correct AccuRater piston size. The standard piston size is shown in the System Piston Guide and Refrigerant Charges tables on page 21.

f)Horizontal con®guration Ð If the total equivalent horizontal length is 100 ft or longer, the indoor piston must be increased one full piston size, in addition to the charge change in Step l), page 23. If exact size is not available, use next smaller size per Chattleff Common Piston Sizes table.

g)Elevated con®guration Ð After ®nding the appropri- ate change in piston size, add or subtract the change from the original piston size number. If the piston size is decreased, round down to the next common piston size. If the piston size is increased, round the new piston size up to the next common piston size.

h)Liquid line solenoid and tubing con®guration Ð The solenoid has a ¯ow arrow stamped on the valve body. When the valve is closed (not energized), the pressure is applied in the direction of the ¯ow arrow, complete shut off will occur. If pressure is applied against the direction of the arrow, leakage through the valve will occur. When determining the proper lo- cation for a solenoid in a system liquid line, consider both ¯ow direction and location of the valve in the system. See the diagram below for proper location, and install per sections i), j), and k) below.

i)Horizontal con®guration (see ®gure below) Ð Install a bi¯ow (538D only or standard) liquid line solenoid valve within 2 ft of the fan coil with the ¯ow arrow pointing toward the indoor unit if equivalent ft of pip- ing is 100 ft or more.

Slope the vapor line toward the indoor unit to provide for refrigerant migration protection during the off cycle due to temperature differences caused by slight el- evation changes between indoor and outdoor units.

NOTE: When installing a liquid line solenoid, a low- voltage transformer may be required.

CHANGE IN INDOOR UNIT PISTON SIZE

FOR ELEVATION

OUTDOOR UNIT ABOVE INDOOR UNIT

Ft		Piston Change
0- 25		0
26-	50	-3
51-	75	-5
76-100		-7
101-125		-9
126-150		-10
	INDOOR UNIT ABOVE OUTDOOR UNIT
Ft		Piston Change
0-25		0
26-65		+4

	LEGEND
FCU	Ð	Fan Coil Unit
OU	Ð	Outdoor Unit	*009,012 systems.

²538A,538D018,024 systems.

Horizontal Con®guration

*009,012 systems. ²538A,538D018,024 systems.

	LEGEND
FCU	Ð Fan Coil Unit
OU	Ð Outdoor Unit
	Liquid Line
	Solenoid Valve
	(if used)

Lowered Con®guration Ð Indoor Unit

Installed Below the Outdoor Unit

*009,012 systems. ²538A,538D018,024 systems.

	LEGEND
FCU	Ð Fan Coil Unit
OU	Ð Outdoor Unit
	Liquid Line
	Solenoid Valve
	(Required over 25 ft)

Elevated Con®guration Ð Indoor Unit

Installed Above the Outdoor Unit

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