Carrier Gemini 38AU 07 Series Installation, Start-Up And Service Instructions Manual page 12

FIRST ON/LAST OFF = 2
VERTICAL INSTALLATION
FIRST ON/LAST OFF = 1
HORIZONTAL INSTALLATION
Fig. 8 — Typical Evaporator Coil Connections (40RU)
The 38AU units include one (38AUZ) or two (38AUD) Puron-
duty filter drier(s), shipped in cartons attached to the unit basepan
(see Table 12). 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.
Installation of liquid line moisture indicating sightglass in each
circuit is recommended. Locate the sightglass(es) between the out-
let of the filter drier and the TXV inlet.
Refer to Table 13 for recommendations on refrigeration
specialties.
Table 12 — Puron-duty Filter Drier(s)
LIQUID LINE
MODEL SIZE QTY
OD (in.)
38AUZ*07 1 /
3
38AUZ*08
1 1 /
38AUZ*12 1 /
1
38AUZ*14 1 /
5
38AUD*12 2 /
3
38AUD*14 2 /
1
Table 13 — Refrigerant Specialties Part Numbers
LIQUID LINE
LIQUID
SOLENOID
LINE LLSV COIL
VALVE
SIZE
(LLSV)
/ EF680033 EF680037
3
8
/ EF680035 EF680037
1
2
/ EF680028 EF680032
5
8
LIQUID LINE
CONNECTION
SUCTION-VAPOR
CONNECTION
CONDENSATE DRAIN
CONNECTION
CONDENSATE DRAIN CONNECTION
PART
DESICCANT
NUMBER
VOLUME
REF.
8 cu in. KH43LS091
8
16 cu in. KH43LS085
2
16 cu in. KH43LS085
2
16 cu in. KH43LS086
8
8 cu in. KH43LS091
8
16 cu in. KH43LS085
2
SIGHT FILTER
GLASS DRIER
KM680008
Provided with
KM680004 unit, see
Table 12
KM680005
In some applications, depending on space and convenience re-
quirements, 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. 9) or 2 filter driers
and sight glasses may be installed at B locations (see Fig. 9 and
10).
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.
INSTALL LIQUID LINE SOLENOID VALVE
It is recommended that a solenoid valve be placed in the main liq-
uid line (see Fig. 9 and 10) between the condensing unit and the
evaporator coil. Locate the solenoid valve at the outlet end of the
liquid line, near the evaporator coil connections, with flow direc-
tion arrow pointed at the evaporator coil. Refer to Table 13. (A liq-
uid line solenoid valve is required when the liquid line length ex-
ceeds 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 in parallel
with the compressor contactor coil (see Fig. 9 and 10). This means
of electrical control is referred to as solenoid drop control.
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. 9 — Location of Sight Glass(es) and Filter Driers
Typical 38AUZ Systems
12
EQUALIZER LINE
SIGHT GLASS
A LOCATION
FILTER DRIER
A LOCATION
TXV
8 DIAMS
MIN
LIQUID LINE
SOLENOID
VALVE
EQUALIZER LINE
SIGHT GLASS
A LOCATION
TXV FILTER DRIER
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