Charging The System - Bosch Greensource SM024 Installation, Operation And Maintenance Manual

SM AH Series Heat Pump

CHARGING THE SYSTEM

Do not overcharge the system. Charge all systems
by weight as determined from Figure #15 and the
supplied factory charge. Remember the
condensing unit is factory charged with sufficient
refrigerant to support the air handler, condensing
section and 25 feet of liquid line. If the lines are
less orm ore than 25 feet, then a charge
adjustment must be calculated. Refer to examples
#1 and #2 in Figure #15..
DANGER: High pressure refrigerant gas and
liquid is present in the unit. Liquid
refrigerant can cause severe burns to
exposed skin areas. Wear safety glasses to
protect the eyese. Liquid refrigerant in
contact with the eyes could cause loss of
sight.
Open both service valves in the condensing section
by turning the valve stops located at the top of
each valve counter-clockwise with an Allen
wrench. Make sure that both valves are fully open.
THINGS TO REMEMBER:
• Do not oversize liquid lines unless absolutely
unavoidable. If oversized lines must be used, a
suction line accumulator may be required and
the addition of a crankcase heater may be
necessary. Consult the Factory for
recommendation.
Figure 15: Refrigerant Charge, Line Sizing and Capacity Multiplier Chart
SYSTEM Factory
R410A
MODEL
Charge
(Oz)*
SM024 80
SM036 86
SM048 88
SM060 115
SM070 127
CAPACITY MULTIPLIER
Example 1:
Model SM036 with 45ft of equivalent length of 3/8" O.D Liquid
Line. Total system charge= Factory charge + (45ft - 25 ft) x .60
oz/ft Total System Charge = 93 oz + (20ft x .60 oz/ft) = 105 oz.
Additional 12 oz of R410A refrigerant required.
Refrigerant Line O.D. Size (Based on Equivalent Line Length)
25 FT. 35 FT.
LIQ. SUC. LIQ. SUC.
3/8 3/4 3/8 3/4
3/8 3/4 3/8 3/4
3/8 7/8 3/8 7/8
3/8 1-1/8 3/8 1-1/8
3/8 1-1/8 3/8 1-1/8
1.00 .995
• If the calculated Equivalent Line Length falls
between the lengths shown on Table 3, use
tubing sized for the next longer length.
• Maximum Linear (actual) liquid line length
without a suction line accumulator is 60 feet.
Liquid line length in excess of 100 feet is not
recommended either with or without a suction
line accumulator.
• A liquid line drier-filter is required, it must be
of the bidirectional type only and approved for
the refrigerant type utilized.
• Suction line size must be one of those given in
Figure #15.
• Horizontal suction line runs should be pitched
slightly toward the compressor to provide free
drainage and aid oil return. Do not exceed the
largest diameter given in the tables on
horizontal runs.
• When brazing always bleed dry nitrogen
through refrigerant tubing to displace air and
prevent oxidation.
• Air handler is pre-charged in the factory with
nitrogen gas. Cut air handler piping with care.
DANGER: Always check refrigerant type on
the unit data plate before servicing. Do not
use R-22 manifold gauges on R-410A units.
Doing so could result in severe injury.
45 FT. 50 FT.
LIQ. SUC. LIQ. SUC.
3/8 3/4 3/8 3/4
3/8 3/4 3/8 7/8
3/8 7/8 3/8 7/8
3/8 1-1/8 3/8 1-1/8
3/8 1-1/8 3/8 1-1/8
0.990 0.990
Example 2:
Model SM060 with 10ft of equivalent length of 3/8" O.D
Liquid Line. Total system charge= Factory charge + (25ft -
10ft) x .60 oz/ft Total System Charge = 150 oz + (15ft x .60
oz/ft) = 141 oz. Additional 12 oz of R410A refrigerant
required.
Charging the system | 13
Suct. Line
Riser Max.
75 FT
LIQ. SUC.
3/4
3/8 7/8
3/4
3/8 7/8
7/8
3/8 7/8
7/8
3/8 1-1/8
7/8
3/8 1-1/8
0.980
8733920846 (2014/01)