Installation manual

10
Table 3 – Puron-duty Filter Drier(s)
Model- S ize Qty
Liquid
Line OD
Desiccant
Volume
Part
Number Ref
38AUQ*16 2
1
/
2
-in 16 cu. in. KH43LG089
38AUQ*25 2
1
/
2
-in 16 cu. in. KH43LG089
Table 4 – Refrigerant Specialties Part Numbers
LIQUID LINE
SIZE (in.)
LIQUID LINE
SOLENOID VALVE (LLSV)
SOLENOID
COIL
SIGHT
GLASS
FILTER
DRIER
1
/
2
EF680035 plus EF680039 biflow kit EF680037 KM680004
Provided with unit
See Table 4
5
/
8
EF680036 plus EF680039 biflow kit EF680037 KM680005
Install Liquid Line Solenoid Valves —
It is recommended that bi-directional solenoid valves be
placed in the main liquids line for circuits 1 and 2 (see
Fig. 6) between the outdoor unit and the indoor coil.
Locate the solenoid valves at the end of the liquid lines,
near the outdoor unit connections, with flow direction
arrow pointed at the outdoor unit. Refer to Table 4. (A
liquid line solenoid valve is required when the liquid line
length exceeds 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 according to the unit label
diagram.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Failure to use a solenoid valve relay (SUR) accessory
may cause overload of Comfort Alert Diagnostic
Module (CADM) and compressor alarm lock out.
CAUTION
!
Capacity Control Liquid Line Solenoid Valve —
Evaporator capacity control via liquid solenoid valve is
not recommended for use with 38AUQ models.
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
TXV
SENSING
BULB
TXV
CKT 1
8 DIAMS
MIN
15 DIAMS
MIN
10
DIAMS
Dual Circuit Coil Piping Configuration
C10830
Fig. 6 -- Location of Sight Glasses and Filter Driers
Table 5 – Minimum Outdoor Air Operating Temperature
UNIT
%
COMPRESSOR
CAPACITY
MINIMUM OUTDOOR
TEMP — F (C)*
Standard Unit
Head Pressure
Control
†
38AUQ16
100
35 (1.7) –20 (–28.9)
38AUQ25 35 (1.7) –20 (–28.9)
* Applies to Cooling mode of operation only.
† Wind baffles (field-supplied and field-installed) are recommended for all
units with low ambient head pressure control. Refer to Low Ambient
Control Installation Instructions (shipped with accessory) for details.
38AUQ