Bryant 538J-18-1 manual START-UP Preliminary Checks, II. Leak Test, III. Evacuate and Dehydrate

Table 2 — American/European Wire Conversions

	AMERICAN		EUROPEAN
Industry		American Conversion	Industry Standard
Standard Size		(mm)	Size (mm2)
18 AWG		0.82	1.0
16 AWG		1.30	1.5
14 AWG		2.08	2.5
12 AWG		3.30	4.0
10 AWG		5.25	6.0
8 AWG		6.36	10.0
6 AWG		13.29	16.0
4 AWG		21.14	25.0
3 AWG		26.65	—
2 AWG		33.61	35.0
1 AWG		42.39	50.0
1/0 AWG		53.49	—
2/0 AWG		67.42	70.0
3/0 AWG		85.00	95.0
4/0 AWG		107.19	120.0
250 kcmil		126.64	150.0
300 kcmil		151.97	—
350 kcmil		177.90	185.0
400 kcmil		202.63	240.0
500 kcmil		253.29	300.0
600 kcmil		303.95	—

LEGEND

AWG — American Wire Gage kcmil — Thousand Circular Mils

START-UP

I.PRELIMINARY CHECKS

1.Check that all internal wiring connections are tight and that barriers, covers, and panels are in place.

2.Make certain field electrical power source agrees with unit nameplate rating.

3.Open all service valves.

II. LEAK TEST

Field piping and fan coil must be leak tested by the pressure method. Use R-22 at approximately 25 psig (172 kPa) backed up with an inert gas to a total pressure not to exceed 245 psig (1690 kPa).

III. EVACUATE AND DEHYDRATE

Field piping and fan coil must be evacuated and dehydrated.

IV. CHARGE SYSTEM

Release factory charge into system by opening (backseating) liquid and suction line service valves. Add charge amount as required for the total system. Refer to separate indoor unit installation instructions for the required total system charge when connected to the indoor unit.

V. TO START UNIT

NOTE: When using 538J unit in conjunction with 619 series fan coils, refer to start-up instructions included with fan coil for correct start-up procedures.

Be sure that field disconnect is closed. Set room thermostat below ambient temperature. Operate unit for 15 minutes, then check system refrigerant charge. See Refrigerant Charging section on page 8.

Unit compressor starts after a 5-minute delay if equipped with accessory Time Guard® II device.

SERVICE

WARNING: Before performing recommended main- tenance, be sure unit main power switch is off. Failure to do so may result in electrical shock or injury from rotat- ing fan blade.

I. OUTDOOR FAN

A reinforced wire mount holds the outdoor fan assembly in place. See Fig. 7 for proper mounting positions.

UNIT 538J DIMENSIONS — in. (mm)

018	024-036	048-060
0.433 (11)	0.709 (18)	0.16 (4)

Fig. 7 — Condenser Fan Mounting Positions

II. HIGH-PRESSURE RELIEF VALVE

Valve is located in compressor. Relief valve opens at a pressure differential of approximately 450 ± 50 psig (3100 ± 345 kPa) between suction (low side) and discharge (high side) to allow pressure equalization.

III.INTERNAL CURRENT AND TEMPERATURE SENSITIVE OVERLOAD

Control resets automatically when internal compressor motor temperature drops to a safe level (overloads may require up to 45 minutes to reset). When an internal over- load is suspected of being open, check by using an ohmmeter or continuity tester.

IV. PUMPDOWN PROCEDURE

The system may be pumped down in order to make repairs on low side without losing complete refrigerant charge.

To pump down:

1.Attach pressure gage to suction service valve gage port.

2.Frontseat the liquid line valve.

CAUTION: The 538J unit coils hold only the factory-designated amount of refrigerant. Additional refrigerant may cause units to relieve pressure through compressor internal pressure relief valve (indicated by sudden rise of suction pressure) before suction pressure reaches 5 psig (34 kPa). If this occurs, shut off unit immediately, then frontseat the suction valve and remove and reclaim excess refrigerant fol- lowing accepted practice.

3.Start unit and run until suction pressure reaches 5 psig (34 kPa).

4.Shut unit off and frontseat suction valve.

5.Depressurize low side of unit and recover refrigerant following accepted practice.

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