5/16 Rev. B 57-02497 20
LOW AMBIENT OPERATION CHARGE
Some Master-Bilt
®
units are provided with condenser flooding valves to maintain proper head pressure during the winter.
These valves function by reducing the effective condenser area by flooding or “backing up” refrigerant in the condenser to
reduce the amount of surface available for condensing. To operate properly, more charge is required during this flooding
condition. These flooding valves are standard on “B” models and optional on others.
To use the charts, multiply the number in Chart B by the percent flooding required in Chart C to arrive at the additional charge
required after providing a clear sight glass.
Example: Determine the additional charge required to operate a BCHX0750 at +20°F suction if the unit is charged at +50°F.
From Chart B, model BCHX0750 has a condenser internal volume of 26.3 lbs. of refrigerant. From Chart C at +50°F at time
of charging and +20°F suction, the condenser would need to be flooded 32%.
Therefore, multiply 26.3 lbs. x 32% = 8.4 lbs. to arrive at the additional charge that must be added after clearing the sight glass
for proper winter operation.
CONDENSER VOLUME IN LBS.
Chart B
Lbs. of Lbs. of
Lbs. of Lbs. of
Lbs. of Lbs. of
Charge Charge
Charge Charge
Charge Charge
Unit
to Fill
to Fill
Unit
to Fill
to Fill
Unit
to Fill
to Fill
Model (R-22) (R-404A) Model (R-22) (R-404A) Model (R-22) (R-404A)
BCH*0300 8.4 7.1 BHMX0300 8.4 MCHX0060 4.2
BCH*0500 13.6 13.2 BHMX0400 13.6 MCHX0080 4.2
BCH*0750 26.3 25.6 BHMX0500 13.6 MCHX0110 4.2
BCH*1000 38.8 37.8 BSLZ0300 5.3 MCHX0150 7.9
BCH*1500 38.8 37.8 BSLZ0350 5.3 MCHX0190 7.9
BCHX0150 5.8 BSLZ0400 7.1 MCHX0300 10.2
BCHX0200 5.4 BSLZ0500 7.1 MCHX0440 25.0
BCLZ0150 5.7 BSLZ0600 13.2 MCHX0500 25.0
BCLZ0170 5.7 BSLZ0750 13.2 MCLZ0020 4.1
BCLZ0200 5.7 MCLZ0030 4.1
BCLZ0250 5.3 MCLZ0050 4.1
BCLZ0280 7.1 MCLZ0070 4.1
BCLZ0300 7.1 MCLZ0100 7.7
BCLZ0400 7.1 MCLZ0140 7.7
BCLZ0600 13.2 MCLZ0170 10.0
BCLZ0750 20.9 MHHX0060 4.2
BCLZ0900 25.6 MHHX0080 4.2
BCLZ1000 25.6 MHHX0110 4.2
BCLZ1500 37.8 MHHX0120 7.9
BCLZ2200 37.8 MHHX0150 7.9
BCM*0150 5.8 5.7 MHHX0190 7.9
BCM*0200 5.4 5.3 MHHX0250 7.9
BCM*0300 8.4 7.1 MHHX0300 10.2
BCM*0500 13.6 13.2 MHHX0350 10.2
BCM*0750 21.4 20.9 MHHX0440 25.0
BCM*1000 26.3 25.6 MHHX0500 25.0
BCM*1500 38.8 37.8 MHLZ0020 4.1
BCM*2000 38.8 37.8 MHLZ0030 4.1
BCMX0070 N/A N/A MHLZ0050 4.1
BCMX0100 N/A N/A MHLZ0070 4.1
BHH*0200 5.4 5.3 MHLZ0090 7.7
BHH*0250 5.4 5.3 MHLZ0120 7.7
BHH*0300 8.4 7.1 MSLZ0070 4.1
BHH*0400 13.6 13.2 MSLZ0100 7.7
BHH*0500 13.6 13.2 MSLZ0150 7.7
BHMX0200 5.4 MSLZ0180 24.3
BHMX0250 5.4 MSLZ0220 24.3
*Unit can be filled with either R-22 or R-404A refrigerant
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