Specifications

20 | Maintenance SM CS Series Heat Pump
SM CS Series Heat Pump8 733 920 846 (2014/01) Subject to change without prior notice
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.
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.
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 14: Refrigerant Charge, Line Sizing and Capacity Multiplier Chart
SYSTEM
MODEL
Factory
R410A
Charge
(Oz)*
Refrigerant Line O.D. Size (Based on Equivalent Line Length)
Suct. Line
Riser Max.
25 FT. 35 FT. 45 FT. 50 FT. 75 FT
LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC.
SM024
80
3/8 3/4 3/8 3/4 3/8 3/4 3/8 3/4 3/8 7/8
3/4
SM036
86
3/8 3/4 3/8 3/4 3/8 3/4 3/8 7/8 3/8 7/8
3/4
SM048
93
3/8 7/8 3/8 7/8 3/8 7/8 3/8 7/8 3/8 7/8
7/8
SM060
115
3/8 1-1/8 3/8 1-1/8 3/8 1-1/8 3/8 1-1/8 3/8 1-1/8
7/8
SM070
127
3/8 1-1/8 3/8 1-1/8 3/8 1-1/8 3/8 1-1/8 3/8 1-1/8
7/8
CAPACITY MULTIPLIER
1.00 .995 0.990 0.990 0.980
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.
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.
Figure 15: Liquid Line Charge Per Linear Foot
Liquid Line Size, O.D.
1/4 5/16 3/8 1/2 5/8
R410A oz per foot
.25 .44 .60 1.15 1.95