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.
Fig. 9 — Location of Sight Glass(es) and Filter
Driers Typical 38AUZ Systems
Fig. 10 — Location of Sight Glasses and Filter
Driers Typical 38AUD Systems
Table 12 — Refrigerant Specialties Part Numbers
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.
LEGEND
* Install as SVR-2 (SVR-1 is factory-installed).
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
LIQUID
LINE
SIZE
LIQUID LINE
SOLENOID
VALVE
(LLSV)
LLSV COIL
SIGHT
GLASS
FILTER
DRIER
3
/
8
EF680033
EF680037 KM680008
Provided with
unit, see
1
/
2
EF680035
EF680037 KM680004
5
/
8
EF680028
EF680032 KM680005
MODEL
QTY
LSV
RELAY SVR QTY
- PART NUMBER
TRAN3 PRIMARY V:
PART NUMBER
38AUZ
1
1 — HN61PC005
N/R
2
2 — HN61PC005
208/230V: HT01BD202
38AUDA,B
2
2 — HN61PC005
460V: HT01BD702
575V: HT01BD902
38AUDC
2
1 — HN61PC005
N/R #
LSV
— Li
q
uid Solenoid Valve
SVR
— Solenoid Valve Relay
N/R
— Not Re
q
uired
N/R #
— Not Re
q
uired / Factory Installed
AIRFLOW
SUCTION
CIRCUIT 2
SUCTION
CIRCUIT 1
AIRFLOW
15 DIAMS
MIN
10
DIAMS
8 DIAMS
MIN
TXV
SENSING
BULB
EQUALIZER LINE
SIGHT
GLASSES
TXV
CKT 2
FILTER
DRIERS
LIQUID LINE
SOLENOID VALVE
CIRCUIT 2
FLOW
LIQUID LINE
SOLENOID VALVE
CIRCUIT 1
FLOW
TXV
SENSING
BULB
TXV
CKT 1
8 DIAMS
MIN
15 DIAMS
MIN
10
DIAMS
DUAL CIRCUIT COIL PIPING CONFIGURATION
FOR TWO CIRCUIT CONDENSING UNITS
Summary of Contents for Gemini 38AU07 Series
Page 5: ...5 Fig 3 38AUD Z 07 14 Base Unit Dimensions ...
Page 19: ...19 Fig 17 Typical Single Circuit Single Stage 38AUZ Wiring Diagrams ...
Page 20: ...20 Fig 18 Typical Single Circuit Two Stage 38AUZ Wiring Diagram ...
Page 21: ...21 Fig 19 Typical Dual Circuit Two Stage 38AUD Wiring Diagram ...
Page 30: ...30 Fig 30 38AUZD E08 Charging Chart RTPF 7 5 Ton Dual Stage Charging Chart R 410A Refrigerant ...
Page 48: ......
Page 49: ......