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

1
2
FIRST ON/LAST OFF = 2
VERTICAL INSTALLATION
1
FIRST ON/LAST OF F = 1
HORIZONTAL INSTALLATIO N
Fig. 6 - - Typical Evaporator Coil Connections (40RU)
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.
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.
Table 8 – Puron-duty Filter Drier(s)
Liquid
Model-Size Qty
Line OD
3
38AUZ*07 1 / -in
8
1
38AUZ*08 1 / -in
2
3
38AUD*12 2 / -in
8
1
38AUD*14 2 / -in
2
LIQUID LINE
SIZE (in.)
3
/
8
1
/
2
38AUD units require TWO sets of parts.
2
C10071
Desiccant Part
Volume Number Ref
8 cu. in. KH43LS091
16 cu. in. KH43LS085
8 cu. in. KH43LS091
16 cu. in. KH43LS085
Table 9 – Refrigerant Specialties Part Numbers
LIQUID LINE
SOLENOID VALVE (LLSV)
EF680033
EF680035
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.
In some applications,
convenience requirements, it may be desirable to install 2
filter driers and sight glasses in a single circuit
application. One filter drier and sight glass may be
installed at A locations (see Fig. 7) or 2 filter driers and
sight glasses may be installed at B locations (see Figs. 7
and 8).
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 suction lines at the outdoor unit.
TXV
INDOOR SENSING
COIL CKT BULB
AIRFLOW 15 DIAMS
10
MIN
DIAMS
Single Circuit Coil Piping Configuration
For single compressor condensing units
TXV
INDOOR SENSING
COIL CKT 2 BULB
AIRFLOW 15 DIAMS
10
MIN
DIAMS
TXV
SENSING
INDOOR
BULB
COIL CKT 1
AIRFLOW 15 DIAMS
10
MIN
DIAMS
Dual Circuit Coil Piping Configuration
For single compressor condensing units
Fig. 7 - - Location of Sight Glass(es) and Filter Driers
Typical 38AUZ Systems
LLSV SIGHT
COIL GLASS
EF680037 KM680008
EF680037 KM680004
15
depending on space
EQUALIZER LINE
SIGHT GLASS
A LOCATION
FILTER DRIER
A LOCATION
TXV
8 DIAMS
MIN
LIQUID LINE
SOLENOID
VALVE
EQUALIZER LINE
SIGHT GLASS
A LOCATION
FILTER DRIER
TXV
CKT 2 A LOCATION
8 DIAMS
SIGHT
MIN
GLASSES
B LOCATION
FILTER
LIQUID LINE
DRIERS
SOLENOID
B LOCATION
VALVE
TXV
CKT 1
8 DIAMS
MIN
FILTER
DRIER
provided with unit
see Table 8
and
C10202