Bryant 280ANV installation instructions Pumpdown & Evacuation, Pump Down

Charging In Cooling Mode - 280ANV024/036

See user interface set in Charging Mode

Heating Check Chart - 280ANV024/036

	400			For use in Heating Charging Mode only						2757
	350				80ºFID	(27ºC)				2413
			Vapor Service				70ºFID(21ºC)
(psig)	300		Valve Pressure							2068	(KPa)
									(16ºC)
								ID
	250							60ºF		1724
Pressure											Pressure
	200									1380
Refrigerant	150									1034	Refrigerant
	100									690
		Suction Pressure
	50									345
	0	0	10	20		30	40	50	60	0
	(-18ºC)		(-12ºC)	(-7ºC)		(-10ºC)	(4ºC)	(10ºC)	(16ºC)

Outdoor Ambient Temperature ºF (ºC)

A12045

280ANV024/036 Heating Pressure check Chart (Psig)

OD DB			Indoor Temperature (_F)
		60		70		80
(_F)
	High	Low	High	Low	High	Low
60	290	129	329	130	368	132
50	263	106	303	108	346	110
40	245	89	285	90	324	90
30	232	74	270	81	312	87
20	222	69	256	68	291	64
10	212	55	246	52	281	53
0	203	49	238	43	270	50

Fig. 12 - Heating Pressure Check Chart 280ANV024/036

Step 14 — Pumpdown & Evacuation

If this system requires either a Pump Down or Evacuation for any reason, the procedures below must be followed:

Pump Down

Because this system has an inverter controlled, compressor, suction pressure transducer and EXV, conventional procedure cannot be used to “pump down” and isolate the refrigerant into the outdoor unit. The UI (User Interface) has provisions to assist in performing this function.

1.Connect gages to 280ANV liquid and vapor or suction ca- pillary service ports to monitor operating pressures during and at completion of the procedure.

2.In the advanced menu of the UI, go to Checkout > Heat Pump> Pumpdown

3.Select mode to pump down in (COOL or HEAT), COOL mode allows refrigerant to be isolated in outdoor unit. HEAT mode allows the refrigerant to be isolated in indoor coil and lineset. Set desired time period. Default time peri- od for the procedure is 120 minutes.

4.Select Start on UI to begin the pumpdown process. Unit will begin running in selected mode after a brief delay.

5.Close the liquid service valve.

6.The unit will run in selected mode with the low pressure protection set to indicate pumpdown is complete when the suction pressure drops below 0 psig. Compressor protec- tions are still active to prevent damage to the compressor or inverter (high pressure, high current, high torque, scroll temperature, etc.) .

7.Once system indicates pumpdown complete or failure to complete shutdown, close vapor service valve.

8.If pumpdown does not complete due to compressor safety shutdown, a recovery system will be required to remove fi- nal quantity of refrigerant from indoor coil and line set.

9.Remove power from indoor and heat pump unit prior to ser- vicing unit.

Charging In Cooling Mode - 280ANV048/060

See user interface set in Charging Mode

Heating Check Chart - 280ANV048/060

For use in Heating Charging Mode only

	450									3102
	400									2757
	350	Vapor Service		80ºF	ID(27ºC)					2413
		Valve Pressure
					70ºFID(21ºC)
Refrigerant Pressure (psig)	300							ID(16ºC)		2068	Refrigerant Pressure (KPa)
							60ºF
	250									1724
	200									1380
	150									1034
	100	Suction Pressure								690
	50									345
	0	0	10	20	30	40	50		60	0
		(-18ºC)	(-12ºC)	(-7ºC)	(-10ºC)	(4ºC)	(10ºC)		(16ºC)

Outdoor Ambient Temperature ºF (ºC)

A12046

280ANV048/060 Heating Pressure check Chart (Psig)

OD DB			Indoor Temperature (_F)
		60		70		80
(_F)
	High	Low	High	Low	High	Low
60	324	121	360	120	407	121
50	293	99	333	100	380	102
40	277	87	307	80	360	88
30	257	69	288	65	333	69
20	242	57	281	60	320	60
10	232	50	263	47	306	50
0	218	42	253	43	288	42

Fig. 13 - Heating Pressure Check Chart 280ANV048/060

NOTE: A small quantity of charge remains in the OD unit that must be manually recovered if isolating refrigerant to indoor coil and lineset via HEAT mode PUMP DOWN.

Evacuation and Recovery of Refrigerant from within 280ANV

Because this system has an EXV for the heating expansion device, additional steps must be taken to open the EXV if the heat pump unit must be evacuated for service reasons. If the EXV is not open when pulling a vacuum or recovering refrigerant from the heat pump unit, extended evacuation time may be required and/or inadequate vacuum obtained. The UI (User Interface) has provisions to open the EXV for refrigerant recovery and/or evacuation.

1.Connect gages to 280ANV liquid and vapor or suction ca- pillary service ports to monitor operating pressures during and at completion of the procedure. Attach recovery system or vacuum pump to gage set as needed for the service pro- cedure. The service valves must be open to evacuate the unit through the line set service ports. The suction capillary service port is a direct connection to the suction port of the compressor.

2.In the advanced menu of the UI, go to Checkout > Heat Pump> > Evacuation.

3.Set desired time period. Default time period for the proced- ure is 120 minutes.

4.Select START on UI to open the valve.

5.Begin evacuation or refrigerant recovery as required for the procedure after UI indicates the EXV is open. Power may be removed from heat pump after the UI indicates “READY TO EVACUATE.”

6.Remove power from indoor and heat pump unit prior to ser- vicing unit. The EXV will retain the open position.

NOTE: See service training materials for troubleshooting the EXV using EXV CHECK mode.

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