Daikin Maverick I Installation And Maintenance Manual page 45

Figure 38: System Charging Chart: MPS 020B
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SYSTEM CHARGE CHART - REFRIGERANT 410A
20 TON, CIRCUITS 1 & 2
CAUTION: BOTH COMPRESSORS MUST BE OPERATING BEFORE CHECKING
REFRIGERANT CHARGE.
RETURN AIR TEMPERATURE MUST BE WITHIN COMFORT CONDITIONS
BEFORE FINAL REFRIGERANT CHECK!
MEASURE PRESSURE AT COMPRESSOR SUCTION AND DISCHARGE.
INSTRUCTIONS:
MEASURE OUTDOOR AMBIENT TO UNIT.
PLACE (X) ON CHART WHERE SUCTION AND DISCHARGE INTERSECT.
IF (X) IS BELOW OUTDOOR AMBIENT LINE, ADD CHARGE AND REPEAT
STEPS 1-3.
IF (X) IS ABOVE OUTDOOR AMBIENT LINE, RECOVER EXCESS CHARGE
AND REPEAT STEPS 1-3.
575
550
525
500
475
450
425
400
375
350
325
300
275
250
225
100 105 110 115 120
SUCTION PRESSURE (PSIG)
575
550
525
500
475
450
425
400
375
350
325
300
275
250
225
100 105 110 115 120
SUCTION PRESSURE (PSIG)
20 TON, CIRCUIT 2
125 130 135 140 145 150 155
20 TON, CIRCUIT 1
125 130 135 140 145 150 155
45
115
105
95
85
75
65
55
160 165
115
105
95
85
75
65
55
160 165
IM 972-2 • MAVERICK I ROOFTOP SYSTEMS
Maintenance