Table3 - Maximum Vapor Line Sizes
38AUQ Unit 38AUQ Unit
38AUQ
BELOW ABOVE
Size
ID Unit ID Unit
Max Diameter, Single Pipe (in.)
07 1 - 1/8 1-5/8
08 1-3/8 1-5/8
12 1-5/8 1-5/8
Table 4 - Puron-duty Filter Drier(s)
Model-Size Qty Liquid
Line OD
38AUQ*07 1 3/8-in
38AUQ*08 1 1/2-in
38AUQ* 12 1 1/2_in
Desiccant Part
Volume Number Ref
8 cu. in. KH43LG088
16 cu. in. KH43LG089
16 cu. in. KH43LG089
Table 5 - Refrigerant Specialties Part Numbers
LIQUID LINE LIQUID LINE SOLENOID SIGHT FILTER
SIZE (in,) SOLENOID VALVE (LLSV) COIL GLASS DRIER
3/8 EF680033 plus EF680039 biflow kit EF680037 KM680008
1/2 EF680035 plus EF680039 biflow kit EF680037 KM680004 Provided with unit
See Table 4
5/8 EF680036 plus EF680039 biflow kit EF680037 KM680005
Install Filter Drier and Moisture Indicator --
Every unit MUST have a bi-directional filter drier in the
liquid line. Locate the filter drier(s) at the indoor unit, close
to the indoor coil's thermal expansion valve (TXV) inlets.
38AUQ units include one Puron-duty filter drier, shipped
in cartons attached to the unit basepan. Remove the filter
drier and prepare to install in the liquid line at the indoor
coil. Do not remove connection fitting plugs until ready to
connect and braze the filter drier into the liquid line
position. See Table 4.
IMPORTANT: A refrigerant receiver is not
provided with the unit. Do not install a receiver.
Installation of liquid line moisture indicating sightglass in
each circuit is recommended. Locate the sightglass(es)
between the outlet of the filter drier and the TXV inlet.
Refer to Table 5 for recommendations on refrigeration
specialties.
Select the filter drier for maximum unit capacity and
minimum pressure drop. Complete the refrigerant piping
from the indoor unit to the outdoor unit before opening
the liquid and vapor service valves at the outdoor unit.
Install Liquid Line Solenoid Valves m
It is recommended that a bi-directional solenoid valve be
placed in the main liquid line (see Figs. 5 & 6) between
the outdoor unit and the indoor coil. Locate the solenoid
valve at the end of the liquid line, near the outdoor unit
connections, with flow direction arrow pointed at the
outdoor unit. Refer to Table 5. (A liquid line solenoid
valve is required when the liquid line length exceeds 75 ft
[23 m].) This valve prevents refrigerant migration (which
causes oil dilution) to the compressor during the off cycle,
at low outdoor ambient temperatures. Wire the solenoid
according to the unit label diagram.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Failure to use a solenoid valve relay (SVR) PNO
HN61PC005 may cause overload of Comfort Alert
Diagnostic Module (CADM) and compressor alarm
lock out.
CAPACITY CONTROL LIQUID LINE SOLENOID
VALVE - 38AUQ units are single-stage only designs. DO
NOT USE a capacity control liquid line solenoid valve on
the indoor coil.
EQUALIZERLINE
TXV
INDOOR SENSING
COIL CKT BULB SIGHTGLASS
A LOCATION
FILTERDRIER
A LOCATION
AIRFLOW J'
LEGEND
TXV -- Thermostatic Expansion Valve
C11036
Fig. 5 - Location of Sight Glass(es) and Filter Driers
(typical 38AUQ size 07 & 08)
10
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