Bryant 598B X. Start-Up, Xi. Check Charge, A. Cooling Only Procedure, B. Unit Charge

X. START-UP

CAUTION: To prevent compressor damage or personal injury, observe the following:

• Do not overcharge system with refrigerant.

•Do not operate unit in a vacuum or at negative pressure.

•Do not disable low-pressure switch.

CAUTION: To prevent personal injury wear safety glasses, protective clothing, and gloves when handling refrigerant and observe the following:

•Back seating service valves are not equipped with Schrader valves. Fully back seat (counter clockwise) valve stem before removing gage port cap.

CAUTION: Do not vent refrigerant to atmosphere. Re- cover during system repair or final unit disposal.

Follow these steps to properly start up the system:

1.The outdoor unit is equipped with a crankcase heater which operates when the compressor is off. Energize crankcase heater 24 hr. before starting unit. To energize heater only, set indoor thermostat to OFF position and close power disconnect to unit.

NOTE: Starting the compressor without a minimum of 12 hours of crankcase heat prior to initial start-up may result in compressor chattering noise and possible damage to the compressor.

2.Fully back seat (open) liquid and vapor tube service valves.

3.Unit is shipped with valve stem(s) front seated and caps installed. Replace stem caps after system is opened to refrigerant flow (back seated). Replace caps finger tight and tighten additional 1/12 turn (20 ft-lb torque) with wrench.

4.Close electrical disconnects to energize system.

5.Set room thermostat at desired temperature. Be sure set point is below indoor ambient and is set low enough to energize desired speed.

NOTE: Bryant electronic thermostats are equipped with a 15 minute staging timer. This timer prevents the two-speed system from operating at high speed until unit has been operating in low speed for 15 minutes unless there is at least a 5°F difference between room temperature and thermostat set point. To force high speed (after a minimum of 2 minutes in low speed), adjust the set point at least 5° below room ambient.

6.Set room thermostat to COOL and fan control to AUTO or ON as desired. Wait for appropriate time delay(s) and 2 minute minimum low-speed run time. Operate unit for 15 minutes. Check refrigerant charge.

NOTE: If unit has not operated within the past 12 hours or following a unit power-up, upon the next thermostat high- or low-speed demand, unit operates for a minimum of 5 minutes in high speed.

XI. CHECK CHARGE

WARNING: Service valve gage ports are not equipped with Schrader valves. To prevent personal injury, make sure gage manifold is connected to the valve gage ports before moving valves off fully back seated position. Wear safety glasses and gloves when handling refrigerant.

A.COOLING ONLY PROCEDURE

1.Operate unit a minimum of 15 minutes before checking charge.

—11—

2.Measure liquid service valve pressure by attaching an accurate gage to service port.

3.Measure liquid line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoor coil.

4.Refer to Table 4 for required subcooling temperature.

5.Refer to Table 3. Find the point where required subcooling temperature intersects measured liquid service valve pres- sure.

6.To obtain required subcooling temperature at a specific liquid line pressure, add refrigerant if liquid line tempera- ture is higher than indicated or reclaim refrigerant if temperature is lower. Allow a tolerance of ± 3 °F.

TABLE 3—REQUIRED LIQUID-LINE TEMPERATURE (°F)

LIQUID		REQUIRED SUBCOOLING
PRESSURE AT			TEMPERATURE
SERVICE VALVE					(°F)
(PSIG)	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

B. UNIT CHARGE

Factory charge and charging method are shown on pink charging label. Puron® refrigerant cylinders contain a dip tube which allows liquid refrigerant to flow from cylinder in upright position. Charge Puron units with cylinder in upright position and a commercial type metering device in manifold hose. Charge refrigerant into suction line.

NOTE: Unit is to be charged in high capacity only. Charging in low capacity may cause compressor chattering and possible damage to the compressor.