Bryant R-22 service manual Required Liquid-Linetemperature

TABLE 24—REQUIRED LIQUID-LINE TEMPERATURE

PRESSURE (PSIG)			REQUIRED SUBCOOLING TEMPERATURE (°F)
AT SERVICE FITTING	0	5		10	15	20	25
134	76	71		66	61	56	51
141	79	74		69	64	59	54
148	82	77		72	67	62	57
156	85	80		75	70	65	60
163	88	83		78	73	68	63
171	91	86		81	76	71	66
179	94	89		84	79	74	69
187	97	92		87	82	77	72
196	100	95		90	85	80	75
205	103	98		93	88	83	78
214	106	101		96	91	86	81
223	109	104		99	94	89	84
233	112	107		102	97	92	87
243	115	110		105	100	95	90
253	118	113		108	103	98	93
264	121	116		111	106	101	96
274	124	119		114	109	104	99
285	127	122		117	112	107	102
297	130	125		120	115	110	105
309	133	128		123	118	113	108
321	136	131		126	121	116	111
331	139	134		129	124	119	114
346	142	137		132	127	122	117
359	145	140		135	130	125	120

3.Check electrical connections for tightness and controls for proper operation each heating (heat pump only) or cooling season and service as necessary.

CAUTION: Because of possible damage to the equip- ment or personal injury, maintenance should be per- formed by qualified personnel only.

COIL CLEANING

1. Remove top cover. See Remove Top Cover section.

CAUTION: Coil fin damage can result in higher oper- ating costs or compressor damage. Do not use flame, high-pressure water, steam, or volatile or corrosive clean- ers on fins or tubing.

2.Clean coil using vacuum cleaner and its crevice tool. Move crevice tool vertically, close to area being cleaned, making sure tool touches only the dirt on the fins and not the fins. To prevent fin damage, do not scrub fins with tool or move tool horizontally against fins.

3.If oil deposits are present, spray coil with ordinary house- hold detergent. Wait 10 minutes, and proceed to next step.

4.Using garden hose, spray coil vertically downward with constant stream of water at moderate pressure. Keep nozzle at a 15° to 20° angle, about 3 in. from coil face and 18 in. from tube. Spray so debris is washed out of coil and basepan.

5.Restore power to unit.

CLEANING OUTDOOR FAN MOTOR AND BLADE

1.Remove fan motor and blade. Refer to Remove Fan-Motor Assembly section of this manual. Be careful not to bend or dent fan blade.

2.Clean motor and blade with soft brush or cloth. Be careful not to disturb balance weights on fan blade.

3.Check fan-blade setscrew for tightness.

4.Reinstall fan motor and blade to top cover and check for alignment.

5.Reinstall top cover and position blade as per Fig. 24.

6.Reconnect electrical power and check for proper operation.

ELECTRICAL CONTROLS AND WIRING

1.Disconnect power to both the outdoor and indoor units.

2.Check all electrical connections for tightness. Tighten all screws on electrical connections. If any connections appear to be burned or smoky, disassemble the connection, clean all parts and stripped wires, and reassemble. Use a new connector if old one is burned or corroded and crimp tightly.

3.Reconnect electrical power to the indoor and outdoor units and observe unit through 1 complete operating cycle.

4.If there are any discrepancies in the operating cycle, troubleshoot to find the cause, and correct.

REFRIGERANT CIRCUIT

1.Check the refrigerant charge using the superheat or sub- cooling method, whichever is applicable. If low on charge, check unit for leaks using an electronic leak detector.

2.If any leaks are found, recover or isolate charge (pump- down) if applicable and make necessary repairs.

3.Evacuate, recharge, and operate unit through entire cycle.

FINAL CHECKOUT

After the unit has been operating, the following items should be checked:

1.Check that unit operational noise is not excessive due to vibration of components, tubing, panels, etc. If present, isolate problem and correct.

2.Check to be sure caps are installed on service valves and that they are tight.

—46—