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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 averagescale
deposit, allow solution to remain in condenser over-
night. For heavy scale deposit, allow 24 hours.
d. Drain condenser and flush with clean water.
Figure 10 Forced Circulation Method
5.9 Refrigerant Charging
90MA/MF --
These units are shipped with a full
operating charge. If recharging is necessary (complete
charge lost), weighin amountof 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 s tandard 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
(1607 kPa) for R--407C units. Charge to a clear sight
glass.
90MU004 UNITS R--22
90MU006 UNITS R--22
70 75 80 85 90 95 100
180
200
220
240
260
280
300
320
340
360
380
400
TEA60F/16C
TEA70F/21C
TEA80F/27C
TEA90F/32C
TEA100F/38C
TEA1 10F/43C
TEA120F/49C
1379
1241
2069
1517
1655
1793
1930
2206
2344
2482
2620
2758
483 517 552 587 655622 690
COMPRESSORDISCHARGEPRESS-- PSIG
COMPRESSORDISCHARGEPRESS-- kPa
PSIG
kPa
COMPRESSOR SUCTION PRESSURE
(TEA= TEMPERATURE, ENTERINGAIR)
kPa
PSIG
TEA1 10F/43C
TEA100F/38C
TEA90F/32C
TEA80F/27C
TEA70F/21C
TEA60F/16C
517483
70
180
COMPRESSOR SUCTION PRESSURE
552
75 80
587
85
655
95
622
90
690
100
(TEA= TEMPERATURE, ENTERINGAIR)
1379 200
1241
2069 300
1655
1517
1930
1793
220
240
260
280
2344
2206
2620
2482
320
340
360
380
2758 400
COMPRESSORDISCHARGEPRESS-- PSIG
COMPRESSORDISCHARGEPRESS-- kPa
90MU004 UNITS R--407C
90MU006 UNITS R--407C
Figure 11 Charging Charts