Carrier 90MA/MF/MU manual d.Drain condenser and flush with clean water

c.Regulate flow to condenser with a supply line valve. If pump is a non-overloading type, the valve may be fully closed while pump is running. For average scale deposit, allow solution to remain in condenser over- night. For heavy scale deposit, allow 24 hours.

d.Drain condenser and flush with clean water.

(1607 kPa) for R-407C units. Charge to a clear sight glass.

90MU004 UNITS R--22

Figure 10 Forced Circulation Method

5.9Refrigerant Charging

90MA/MF --These units are shipped with a full operating charge. If recharging is necessary (complete charge lost), weigh in amount of refrigerant indicated on unit nameplate and in Table 1, Table 3 or Table 2.

If unit has partial charge, it must be recharged by removing existing charge and recharging by weighing in the required amount of refrigerant.

90MU004 & 006 --These units, used with remote condensers, are shipped with a holding charge only. To charge:

a. Open discharge and liquid service valves. b. Leak test, reclaim refrigerant and evacuate.

c. Using standard refrigerant charging techniques and charging charts (Figure 11) add refrigerant as re- quired to maintain proper operating conditions.

90MU008 & 012 --These units, used with remote condensers, are shipped with a holding charge only. To charge:

a. Open discharge line, liquid line, compressor dis- charge and compressor suction service valves.

b. Leak test, reclaim refrigerant and evacuate.

c.Add sufficient refrigerant vapor to permit continuous operation after starting unit.

d.Start unit. Using standard charging techniques, add refrigerant as required to maintain normal operating conditions. Use charging chart supplied with con- denser, if available. If information is not available, block off enough of condenser or set water regulating valve as applicable to maintain a discharge pressure of 220 psig (1517 kPa) for R-22 units or 233 psig

90MU006 UNITS R--22

90MU004 UNITS R--407C

	2758	-- PSIG	400			(TEA = TEMPERATURE, ENTERING AIR)
-- kPa									TEA120F/49C
	2620		380
PRESS	2482	PRESS	360						TEA110F/43C
	2344		340
DISCHARGE	2206	DISCHARGE	320						TEA100F/38C
	2069		300						TEA90F/32C
	1930		280
									TEA80F/27C
	1793		260
COMPRESSOR	1655	COMPRESSOR	240						TEA70F/21C
	1517		220						TEA60F/16C
	1379		200
	1241		180
			70	75	80	85	90	95	100PSIG
			483 517		552	587	622	655	690kPa

COMPRESSOR SUCTION PRESSURE

90MU006 UNITS R--407C
	2758	-- PSIG	400			(TEA = TEMPERATURE, ENTERING AIR)
-- kPa									TEA110F/43C
	2620		380
PRESS	2482	PRESS	360						TEA100F/38C
	2344		340
DISCHARGE	2206	DISCHARGE	320						TEA90F/32C
	2069		300
	1930		280						TEA80F/27C
	1793		260
COMPRESSOR	1655	COMPRESSOR	240						TEA70F/21C
	1517		220
									TEA60F/16C
	1379		200
	1241		180	75	80	85	90	95	100PSIG
			70
			483 517		552	587	622	655	690kPa
				COMPRESSOR SUCTION PRESSURE

Figure 11 Charging Charts

11 62--10458--00