Carrier Gemini 38AU07 Series Installation Instructions Manual page 12

Select the filter drier for maximum unit capacity and mini-
mum 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 liquid 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 connec-
tions, with flow direction arrow pointed at the evaporator
coil. Refer to Table 12. (A liquid line solenoid valve is re-
quired when the liquid line length exceeds 75 ft [23 m].) This
valve prevents refrigerant migration (which causes oil dilu-
tion) 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
8 DIAMS
SINGLE CIRCUIT COIL PIPING CONFIGURATION
FOR SINGLE COMPRESSOR CONDENSING UNITS
TXV
INDOOR SENSING
COIL CKT 2 BULB
AIRFLOW 15 DIAMS
10
MIN
DIAMS
8 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
EQUALIZER LINE
SIGHT GLASS
A LOCATION
FILTER DRIER
A LOCATION
TXV
MIN
LIQUID LINE
SOLENOID
VALVE
EQUALIZER LINE
SIGHT GLASS
A LOCATION
TXV FILTER DRIER
CKT 2 A LOCATION
SIGHT
MIN
GLASSES
B LOCATION
FILTER
LIQUID LINE
DRIERS
SOLENOID
B LOCATION
VALVE
TXV
CKT 1
8 DIAMS
MIN
TXV
SENSING
BULB
AIRFLOW
15 DIAMS
10
MIN
DIAMS
TXV
SENSING
BULB
AIRFLOW 15 DIAMS
10
MIN
DIAMS
SUCTION
CIRCUIT 1
SUCTION
CIRCUIT 2
DUAL CIRCUIT COIL PIPING CONFIGURATION
FOR TWO CIRCUIT CONDENSING UNITS
Fig. 10 — Location of Sight Glasses and Filter
Driers Typical 38AUD Systems
Table 12 — Refrigerant Specialties Part Numbers
LIQUID LINE
LIQUID
SOLENOID
LINE
VALVE
SIZE
(LLSV)
3 / EF680033
8
1 / EF680035
2
5 / EF680028
8
Solenoid Drop Control Wiring
Control the power to the liquid line solenoid through a So-
lenoid Valve Relay (SVR) in all units. Use part number
HN61PC005 (field-supplied, installed). 38AUZ unit requires
one SVR; 38AUD unit requires two relays.
A unit with two liquid line solenoid valves also requires a
separate control power transformer for the liquid solenoid
valve loads. Select TRAN3 transformer part number accord-
ing to unit power supply.
QTY RELAY SVR QTY
MODEL
LSV - PART NUMBER
1 1 — HN61PC005
38AUZ
2 2 — HN61PC005
38AUDA,B 2 2 — HN61PC005
38AUDC 2 1 — HN61PC005
LEGEND
LSV
— Liquid Solenoid Valve
SVR
— Solenoid Valve Relay
N/R
— Not Required
N/R # — Not Required / Factory Installed
* Install as SVR-2 (SVR-1 is factory-installed).
12
EQUALIZER LINE
TXV
CKT 2
8 DIAMS
MIN
SIGHT
GLASSES
FILTER
DRIERS
TXV
CKT 1
8 DIAMS
MIN
SIGHT
LLSV COIL
GLASS
EF680037 KM680008
Provided with
EF680037 KM680004 unit, see
Table 11
EF680032 KM680005
TRAN3 PRIMARY V:
PART NUMBER
N/R
208/230V: HT01BD202
460V: HT01BD702
575V: HT01BD902
N/R #
LIQUID LINE
SOLENOID VALVE
CIRCUIT 2
LIQUID LINE
SOLENOID VALVE
CIRCUIT 1
FILTER
DRIER