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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.
Unit
Model
BCH*0300
BCH*0500
BCH*0750
BCH*1000
BCH*1500
BCHX0150
BCHX0200
BCLZ0150
BCLZ0170
BCLZ0200
BCLZ0250
BCLZ0280
BCLZ0300
BCLZ0400
BCLZ0600
BCLZ0750
BCLZ0900
BCLZ1000
BCLZ1500
BCLZ2200
BCM*0150
BCM*0200
BCM*0300
BCM*0500
BCM*0750
BCM*1000
BCM*1500
BCM*2000
BCMX0070
BCMX0100
BHH*0200
BHH*0250
BHH*0300
BHH*0400
BHH*0500
BHMX0200
BHMX0250
*Unit can be filled with either R-22 or R-404A refrigerant
5/16 Rev. B 57-02497
CONDENSER VOLUME IN LBS.
Lbs. of
Lbs. of
Charge
Charge
to Fill
to Fill
Unit
(R-22)
(R-404A)
Model
8.4
7.1
BHMX0300
13.6
13.2
BHMX0400
26.3
25.6
BHMX0500
38.8
37.8
BSLZ0300
38.8
37.8
BSLZ0350
5.8
BSLZ0400
5.4
BSLZ0500
5.7
BSLZ0600
5.7
BSLZ0750
5.7
5.3
7.1
7.1
7.1
13.2
20.9
25.6
25.6
37.8
37.8
5.8
5.7
5.4
5.3
8.4
7.1
13.6
13.2
21.4
20.9
26.3
25.6
38.8
37.8
38.8
37.8
N/A
N/A
N/A
N/A
5.4
5.3
5.4
5.3
8.4
7.1
13.6
13.2
13.6
13.2
5.4
5.4
Chart B
Lbs. of
Lbs. of
Charge
Charge
to Fill
to Fill
Unit
(R-22)
(R-404A)
Model
8.4
MCHX0060
13.6
MCHX0080
13.6
MCHX0110
5.3
MCHX0150
5.3
MCHX0190
7.1
MCHX0300
7.1
MCHX0440
13.2
MCHX0500
13.2
MCLZ0020
MCLZ0030
MCLZ0050
MCLZ0070
MCLZ0100
MCLZ0140
MCLZ0170
MHHX0060
MHHX0080
MHHX0110
MHHX0120
MHHX0150
MHHX0190
MHHX0250
MHHX0300
MHHX0350
MHHX0440
MHHX0500
MHLZ0020
MHLZ0030
MHLZ0050
MHLZ0070
MHLZ0090
MHLZ0120
MSLZ0070
MSLZ0100
MSLZ0150
MSLZ0180
MSLZ0220
20
Lbs. of
Lbs. of
Charge
Charge
to Fill
to Fill
(R-22)
(R-404A)
4.2
4.2
4.2
7.9
7.9
10.2
25.0
25.0
4.1
4.1
4.1
4.1
7.7
7.7
10.0
4.2
4.2
4.2
7.9
7.9
7.9
7.9
10.2
10.2
25.0
25.0
4.1
4.1
4.1
4.1
7.7
7.7
4.1
7.7
7.7
24.3
24.3
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