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Figure 3: Liquid line filter-drier installation at outdoor
unit
Installing the filter-drier at indoor coil
About this task:
Complete the following steps and see
filter-drier at the indoor coil:
1.
Connect low pressure nitrogen to the liquid line
indoor coil.
2.
Insert a short piece of 3/8 in. tubing into the liquid
line indoor coil. Install filter drier (direction arrow
toward indoor coil) on the short piece of tubing
and insert the liquid line going to the indoor coil
into the opposite end of the filter drier.
3.
Wrap a wet rag around the filter drier.
4.
Braze the liquid line connections.
Figure 4: Liquid line filter-drier installation at indoor
coil
8
Installation Manual: R-410A Outdoor Split-System Air Conditioner
Piping connections
The outdoor condensing unit must be connected to the
indoor evaporator coil using field-supplied refrigerant
grade (ACR) copper tubing that is internally clean and
dry. Units must be installed only with the tubing sizes for
approved system combinations as specified in the Tabular
Data Sheet. The charge given is applicable for total tubing
lengths up to 15 ft (4.6 m). Refer to the Piping Application
Guide (P/N 24077) for installing tubing of longer lengths
and elevation differences.
Figure 4
to install a
Precautions during line installation
•
•
Johnson Controls Ducted Systems
NOTICE
Using a larger than specified line size could result
in oil return problems. Using too small a line results
in loss of capacity and other problems caused by
insufficient refrigerant flow. Slope horizontal vapor
lines at least 1 in. (2.5 cm) every 20 ft (6.1 m) toward
the outdoor unit to facilitate adequate oil return. If
more than the 80 ft line length is necessary, facilitate
correct refrigerant velocity with adjusted line diameter
in accordance with the Piping Application Guide (P/N
24077).
CAUTION
This system uses R-410A refrigerant, which operates
at higher pressures than R-22. No other refrigerant
may be used in this system. Gauge sets, hoses,
refrigerant containers, and the recovery system must
be designed to handle R-410A. If you are unsure,
consult the equipment manufacturer.
WARNING
Never install a suction-line filter-drier in the liquid line
of an R-410A system. Failure to follow this warning
can cause a fire, injury or death.
Install the lines with as few bends as possible. Be
careful not to damage the couplings or kink the
tubing. Use clean hard drawn copper tubing where no
appreciable amount of bending around obstruction is
necessary. If soft copper must be used, be careful to
avoid sharp bends, which may cause a restriction.
Install the lines so that they do not obstruct service
access to the coil, air handling system, or filter.
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