Bryant 575B, 575C, 541A Iii. Complete Refrigerant Piping Connections, A. Check Vertical Separation

III. COMPLETE REFRIGERANT PIPING CONNECTIONS

Refrigerant lines must be carefully designed and constructed to ensure equipment reliability and efficiency. Line length, pressure drop, compressor oil return, and vertical separation are several of the design criteria that must be evaluated. See Table 2.

IMPORTANT: Do not bury refrigerant piping underground.

IMPORTANT: Piping must be properly sized and installed for the system to operate efficiently.

A. Check Vertical Separation

If there is any vertical separation between the indoor and out- door units, check to ensure that the separation is within allowable limits. Relocate equipment if necessary. See Table 3.

B. Refrigerant Line Sizing

Consider the length of the piping required between the out- door and indoor units. The maximum allowable line length is 100 ft. See Table 3. Refrigerant suction piping should be insulated.

IMPORTANT: A refrigerant receiver is not provided with the unit. Do not install a receiver.

IMPORTANT: For 575C090,120 applications with liquid lift greater than 20 ft, use 5/8-in. liquid line. Maximum lift is 60 ft.

Table 2 — Refrigerant Piping Sizes

			LENGTH OF PIPING ft						MAXIMUM
OUTDOOR		0-25			26-60		61-100		LIQUID
UNIT				Line Size (in. OD)					LINE
									(in. OD)*
	L		V		L	V	L	V
575B072	1/2		11/8		5/8	11/8	5/8	11/8	5/8
575C090	3/8		11/8		1/2	11/8	1/2	11/8	5/8
575C120	1/2		13/8		1/2	13/8	1/2	13/8	5/8
541A180	5/8		15/8		3/4	15/8	3/4	15/8	3/4

*If there is a vertical separation between indoor and outdoor units, see Table 3 — Maximum Vertical Separation.

LEGEND

L — Liquid Line V — Vapor Line

NOTES:

1.Pipe sizes are based on a 2 F loss for liquid and vapor lines.

2.Pipe sizes are based on the maximum linear length, shown for each column, plus a 50% allowance for fittings.

3.Charge units with R-22 refrigerant in accordance with unit installation instructions.

4.Maximum line length must not exceed 100 ft.

5.Do not bury refrigerant piping.

Table 3 — Maximum Vertical Separation*

OUTDOOR		INDOOR UNIT	DISTANCE FT
			Outdoor Unit
UNIT		524A-H
			Above 524A-H
575B	072	090	50
575C	090	090	60
	120	120	60
541A	180	180	80

*Vertical distance between indoor and outdoor units.

C. Install Filter Drier(s) and Moisture Indicator(s)

Every unit should have a filter drier and liquid-moisture indicator (sight glass). In some applications, depending on space and convenience requirements, it may be desirable to install 2 filter driers and sight glasses. One filter drier and sight glass may be installed at A locations in Fig. 5. If desired, 2 filter driers and sight glasses may be installed at B locations in Fig. 5.

Select the filter drier for maximum unit capacity and minimum pressure drop. Complete the refrigerant piping from indoor

unit to outdoor unit before opening the liquid and vapor lines at the outdoor unit. For specific filter driers see Table 4.

D. Liquid Line Piping Procedure

Pipe the system liquid line as follows:

WARNING: Unit is pressurized with a holding charge of refrigerant. Recover R-22 holding charge before removing runaround liquid piping loop. Failure to recover holding charge before removing piping loop could result in equipment damage and personal injury.

1.Open service valves in sequence:

a.Discharge service valve on compressor.

b.Suction service valve on compressor.

c.Liquid line valve.

2.Remove 1/4-in. flare cap from liquid valve Schrader port.

3.Attach refrigerant recovery device and recover hold- ing charge.

4.Remove runaround loop (581A180 only).

5.Connect system liquid line from liquid connection of outdoor unit (575B,C, 541A) to indoor unit (524A-H) liquid line connections. Select proper field-supplied bi-flow filter driers and install in the liquid line. See Fig. 5. Install a field-supplied liquid moisture indica- tor between the filter drier(s) and the liquid connec- tions on the indoor unit. Braze or silver alloy solder all connections. Pass nitrogen or other inert gas through piping while making connections to prevent formation of copper oxide. (Copper oxides are extremely active under high temperature and pres- sure. Failure to prevent collection of copper oxides may result in system component failures.)

E.Liquid Line Solenoid Valve

Addition of a liquid solenoid valve (LLSV) is required (except for 541A180 units that already have LLSV factory-installed). The LLSV must be a bi-flow type suited for use in heat pump systems. Refer to Table 4. Wire the solenoid valve in parallel with the compressor contactor coil.

The LLSV must be installed at the outdoor unit with the flow arrow pointed toward the outdoor unit (in-flow direction for the Heating mode).

LEGEND

TXV — Thermostatic Expansion Valve

Fig. 5 — Location of Sight Glass(es)

and Filter Driers

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