Carrier 38HDF018-036 Maintenance, Lubrication, Troubleshooting, Subcooling Charging Table

Table 5 — Subcooling Charging Table

		REQUIRED LIQUID LINE
LIQUID PRESSURE		TEMPERATURE (F)
AT SERVICE VALVE		Required Subcooling
(psig)			Temperature (F)
	8	10		12	14	16	18
189	58	56		54	52	50	48
195	60	58		56	54	52	50
202	62	60		58	56	54	52
208	64	62		60	58	56	54
215	66	64		62	60	58	56
222	68	66		64	62	60	58
229	70	68		66	64	62	60
236	72	70		68	66	64	62
243	74	72		70	68	66	64
251	76	74		72	70	68	66
259	78	76		74	72	70	68
266	80	78		76	74	72	70
274	82	80		78	76	74	72
283	84	82		80	78	76	74
291	86	84		82	80	78	76
299	88	86		84	82	80	78
308	90	88		86	84	82	80
317	92	90		88	86	84	82
326	94	92		90	88	86	84
335	96	94		92	90	88	86
345	98	96		94	92	90	88
354	100	98		96	94	92	90
364	102	100		98	96	94	92
374	104	102		100	98	96	94
384	106	104		102	100	98	96
395	108	106		104	102	100	98
406	110	108		106	104	102	100
416	112	110		108	106	104	102
427	114	112		110	108	106	104
439	116	114		112	110	108	106
450	118	116		114	112	110	108
462	120	118		116	114	112	110
474	122	120		118	116	114	112
486	124	122		120	118	116	114
499	126	124		122	120	118	116
511	128	126		124	122	120	118

Compressor Lockout Switch — The 38HDR units are provided with a compressor lockout protective device. If the compressor shuts down due to any safety device, a current loop monitoring the compressor current senses no current flow. The unit will lock out until the control power is interrupted to reset the lockout. Determine the reason for the safety trip. To restart, turn the thermostat to the OFF position and then set the thermostat to an operating position.

MAINTENANCE

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

Lubrication

COMPRESSOR — Compressor contains factory oil charge; replace oil when lost. Use Mobile 3MA-POE oil.

Cleaning Coils — Coil should be washed out with water or blown out with compressor air. Note that the blow-thru design causes dirt and debris to build up on the inside of the coils.

Clean coil annually or as required by location and outdoor air conditions. Inspect coil monthly and clean as required. Fins are not continuous through coil sections. Dirt and debris may pass through first section, become trapped between the row of fins and restrict condenser airflow. Use a flashlight to deter- mine if dirt or debris has collected between coil sections. Clean coil as follows:

1.Turn off unit power.

2.Using a garden hose or other suitable equipment, flush coil from the outside to remove dirt. Be sure to flush all dirt and debris from drain holes in base of unit. Fan motors are waterproof.

TROUBLESHOOTING

See Fig. 9 for troubleshooting information.

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