Carrier 38AU Installation, Start-Up And Service Instructions Manual page 15

CKT
2
CKT
1
CKT
1
Fig. 6 - - 38AUD Service Valve Locations
Plan the Circuit 1 and Circuit 2 tubing segments carefully,
mark each segment and check constantly as piping
systems are assembled to avoid piping errors.
38AUD unit cannot
single-circuit/tandem system.
Connecting 40RU to 38AUD: The 40RU fan coil in sizes
16, 25 and 28 is a face-split coil design that also has its
circuits designated as 1 and 2. See Fig. 7. Note that the
lower coil segment changes as the arrangement of the
40RU changes. In a vertical arrangement, the 40RU's
lower coil segment is segment 2; this segment should be
connected to the 38AUD's Circuit 1. In a horizontal
arrangement, the 40RU's lower segment is now segment
1; this segment should be connected to the 38AUD's
Circuit 1.
Note that refrigerant suction piping should be insulated.
40RU Cooling
Arrangement Stage
Y1
Vertical
Y2
Y1
Horizontal
Y2
Install Filter Drier(s) and Moisture Indicator(s) —
Every unit MUST have a filter drier in the liquid line.
38AUD models require two filter driers (one in each
liquid line). Locate the filter drier(s) at the indoor unit,
close to the evaporator coil's thermal expansion valve
(TXV) inlets.
LIQUID LINE
SIZE (in.)
1
/
2
5
/
8
38AUD units require TWO sets of parts.
CKT
2
Circuit 2
Connections
Circuit 1
Connections
C10355
be field-piped as
40RU Coil Connect to
Segment 38AUD
2 Circuit 1
1 Circuit 2
1 Circuit 1
2 Circuit 2
Table 9 – Refrigerant Specialties Part Numbers.
LIQUID LINE
SOLENOID VALVE (LLSV)
EF680035
EF680036
38AU units include one (38AUZ) or two (38AUD)
Puron-duty filter drier(s), shipped in cartons attached to
the unit basepan. Remove the filter drier(s) and prepare to
install in the liquid line(s) at the evaporator coil. Do not
remove connection fitting plugs until ready to connect and
braze the filter drier into the liquid line position.
1
VERTICAL INSTALLATION
a
FIRST ON/LAST OF F = 1
HORIZONTAL INSTALLATIO N
Fig. 7 - - Typical Evaporator Coil Connections (40RU)
Table 8 – Puron-duty Filter Drier(s)
Model-Size Qty
38AUZ*16 1
38AUZ*25 1
38AUD*16 2
38AUD*25 2
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 9 for recommendations on refrigeration
specialties.
LLSV SIGHT
COIL GLASS
EF680037 KM680004
EF680037 KM680005
15
2
FIRST ON/LAST OFF = 2
2
1
Liquid Desiccant
Line OD Volume Number Ref
5
/ -in 30 cu. in. KH43LG087
8
5
/ -in 30 cu. in. KH43LG087
8
1
/ -in 16 cu. in. KH43LG085
2
1
/ -in 16 cu. in. KH43LG085
2
FILTER
DRIER
provided with unit
see Table 8
C10071
Part