Carrier 38AUZ - Install Filter Drier(s) and Moisture Indicator(s)

15
FIRST ON/LAST OFF = 2
VERTICAL INSTALLATION
FIRST ON/LAST OF F = 1
HORIZONTAL INSTALLATION
1
2
2
1
C10071
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). L ocate the filter drier(s) at the indoor unit,
close t o the evaporator coil’s thermal expansion valve
(TXV) inlets.
38AU units include one (38AUZ) or two (38AUD)
Pu ro n- du ty filter drier(s ) , shipped in cartons attached to the
unit basep an . Remove the filter drier( s ) and prepar e to ins tall
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)
Model-Size Qty
Liquid
Line OD
Desiccant
Volume
Part
Number Ref
38AUZ*07 1
3
/
8
-in 8cu.in. KH43LS091
38AUZ*08 1
1
/
2
-in 16 cu. in. KH43LS085
38AUD*12 2
3
/
8
-in 8cu.in. KH43LS091
38AUD*14 2
1
/
2
-in 16 cu. in. KH43LS085
Installation of liquid line moisture indica ting 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, depending on space and
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 refrige rant piping
from the indoor unit to the outdoor unit before opening
the liquid and suction lines at the outdoor unit.
INDOOR
COIL CKT 2
AIRFLOW
INDOOR
COIL CKT 1
AIRFLOW
15 DIAMS
MIN
10
DIAMS
8 DIAMS
MIN
TXV
SENSING
BULB
EQUALIZER LINE
SIGHT GLASS
A LOCATION
SIGHT
GLASSES
B LOCATION
TXV
CKT 2
FILTER DRIER
A LOCATION
FILTER
DRIERS
B LOCATION
FLOW
TXV
SENSING
BULB
TXV
CKT 1
8 DIAMS
MIN
15 DIAMS
MIN
10
DIAMS
Single Circuit Coil Piping Configuration
For single compressor condensing units
Dual Circuit Coil Piping Configuration
For single compressor condensing units
15 DIAMS
MIN
10
DIAMS
8 DIAMS
MIN
INDOOR
COIL CKT
AIRFLOW
TXV
SENSING
BULB
EQUALIZER LINE
SIGHT GLASS
A LOCATION
TXV
FILTER DRIER
A LOCATION
LIQUID LINE
SOLENOID
VALVE
FLOW
LIQUID LINE
SOLENOID
VALVE
C10202
Fig. 7 -- Location of Sight Glass(es) and Filter Driers
Typical 38AUZ Systems
Table 9 – Refrigerant Specialties Part Numbers
LIQUID LINE
SIZE (in.)
LIQUID LINE
SOLENOID VALVE (LLSV)
LLSV
COIL
SIGHT
GLASS
FILTER
DRIER
3
/
8
EF680033 EF680037 KM680008
provided with unit
see Table 8
1
/
2
EF680035 EF680037 KM680004
38AUD units require TWO sets of parts.
38AU