Carrier 38HDL018-060 specifications Start-Up, Preliminary Checks, To Start Unit, Service

Table 2 Ð American/European Wire Conversions

	AMERICAN		EUROPEAN
Industry		American	Industry
Standard		Conversion	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	Ð
2 AWG		33.61	35.0
1 AWG		42.39	50.0
1/0 AWG		53.49	Ð
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	Ð
350 kcmil		177.90	185.0
400 kcmil		202.63	240.0
500 kcmil		253.29	300.0
600 kcmil		303.95	Ð

LEGEND

AWG Ð American Wire Gage kcmil Ð Thousand Circular Mils

START-UP

Preliminary Checks

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

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

3.Open all service valves.

Leak Test Ð Field piping and fan coil must be leak tested by pressure method described in Carrier Standard Service Techniques Manual, Chapter 1, Section 1-6. 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).

Evacuate and Dehydrate Ð Field piping and fan coil must be evacuated and dehydrated by either of the methods described in Carrier Standard Service Techniques Manual, Chapter 1, Section 1-7.

Charge System Ð Release factory charge into sys- tem 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.

To Start Unit

NOTE: When using in conjunction with 40QAB, 40QKB, or 40QNB fan coils, refer to start-up instructions included with fan coil for correct start-up procedures.

Be sure that ®eld disconnect is closed. Set room thermo- stat below ambient temperature. Operate unit for 15 min- utes, 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

Before performing recommended maintenance, be sure unit main power switch is off. Failure to do so may result in electrical shock or injury from rotating fan blade.

Outdoor Fan Ð A reinforced wire mount holds the out- door fan assembly in place. See Fig. 7 for proper mounting positions.

DIMENSIONS Ð in. (mm)

38HDL018	38HDL024-036	38HDL048-060
0.433 (11)	0.709 (18)	0.16 (4)

Fig. 7 Ð Condenser Fan Mounting Positions

High-Pressure Relief Valve Ð Valve is located in compressor. Relief valve opens at a pressure differential of approximately 450 ± 50 psig (3100 ± 345 kPa) between suc- tion (low side) and discharge (high side) to allow pressure equilization.

Internal Current and Temperature Sensitive Over-

load Ð Control resets automatically when internal com- pressor motor temperature drops to a safe level (overloads may require up to 45 minutes to reset). When an internal overload is suspected of being open, check by using an ohm- meter or continuity tester. If necessary, refer to Carrier Stand- ard Systems Techniques Manual, Chapter 2, for complete information.

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

To pumpdown:

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

2.Frontseat the liquid line valve.

The 38HDL unit coils hold only the factory-designated amount of refrigerant. Additional refrigerant may cause units to relieve pressure through compressor inter- nal pressure relief valve (indicated by sudden rise of suction pressure) before suction pressure reaches 5 psig (34 kPa). If this occurs, shut off unit imme- diately, then frontseat the suction valve and remove and reclaim excess refrigerant following 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 fol- lowing accepted practice.

7