Maintenance - Bosch SM024 Installation, Operation And Maintenance Manual

20 | Maintenance

MAINTENANCE
1. Filter changes or cleanings are required at
regular intervals. The time period between
filter changes will depend upon type of
environment the equipment is used in. In a
single family home, that is not under
construction, changing or cleaning the filter
every 60 days is sufficient. In other
applications such as motels, where daily
vacuuming produces a large amount of lint,
filter changes may need to be as frequent as
biweekly.
Equipment should never be used during
construction due to likelihood of wall board
dust accumulation in the air coil of the
equipment which permanently affects the
performance and may shorten the life of the
equipment.
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.
Figure 16: Liquid Line Charge Per Linear Foot
R410A oz per foot
8 733 920 846 (2013/11)
Refrigerant Line O.D. Size (Based on Equivalent Line Length)
25 FT. 35 FT.
LIQ. SUC. LIQ.
3/8 3/4 3/8
3/8 3/4 3/8
3/8 7/8 3/8
3/8 1-1/8 3/8
3/8 1-1/8 3/8
1.00 .995
Liquid Line Size, O.D.
1/4 5/16 3/8
.25 .44 .60
Subject to change without prior notice
2. An annual "checkup" is recommended by a
licensed refrigeration mechanic. Recording the
performance measurements of volts, amps,
and water temperature differences (both
heating and cooling) is recommended. This
data should be compared to the information on
the unit's data plate and the data taken at the
original startup of the equipment.
3. Lubrication of the blower motor is not
required, however may be performed on some
motors to extend motor life. Use SAE-20 non-
detergent electric motor oil.
4. The condensate drain should be checked
annually by cleaning and flushing to insure
proper drainage.
45 FT. 50 FT.
SUC. LIQ. SUC. LIQ.
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 3/8
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.
1/2 5/8
1.15 1.95
SM CS Series Heat Pump
Suct. Line
Riser Max.
75 FT
SUC. LIQ. SUC.
3/4 3/8 7/8
7/8 3/8 7/8
7/8 3/8 7/8
1-1/8 3/8 1-1/8
1-1/8 3/8 1-1/8
0.980
SM CS Series Heat Pump
3/4
3/4
7/8
7/8
7/8