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LIQUID LINE SIZE (in.)
1/2
5/8
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 6. (A liquid line solenoid valve is required when the liq-
uid line length exceeds 75 ft [23 m].) This valve prevents re-
frigerant migration (which causes oil dilution) to the compres-
sor during the off cycle, at low outdoor ambient temperatures.
Wire the solenoid according to the unit label diagram.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment dam-
age.
Failure to use a solenoid valve relay (SUR) accessory may
cause overload of Comfort Alert Diagnostic Module
(CADM) and compressor alarm lock out.
CAPACITY CONTROL LIQUID LINE SOLENOID VALVE
Evaporator capacity control via liquid solenoid valve is not
recommended for use with 575J models.
TXV
SENSING
BULB
AIRFLOW
15 DIAMS
10
MIN
DIAMS
TXV
SENSING
BULB
15 DIAMS
AIRFLOW
10
MIN
DIAMS
SUCTION
CIRCUIT 1
SUCTION
CIRCUIT 2
Dual Circuit Coil Piping Configuration
Fig. 6 — Location of Sight Glasses and Filter Driers
MAKE PIPING CONNECTIONS
Piping connections at the 575J unit are ball valves with stub
tube extensions. Do not open the unit service valves until all
interconnecting tube brazing as been completed. The stub tube
connections include 1/4 in. SAE service fittings with Schrader
valve cores (see Fig. 7). Before making any brazed connections
to the unit service valves, remove both Schrader valve caps and
cores and save for re-installation. Connect a source for nitrogen
to one of these service fittings during tube brazing to prevent
the formation of copper oxides inside the tubes at brazed joints.
Table 6 — Refrigerant Specialties Part Numbers
LIQUID LINE SOLENOID VALVE (LLSV)
EF680035 plus EF680039 biflow kit
EF680036 plus EF680039 biflow kit
EQUALIZER LINE
TXV
CKT 2
8 DIAMS
MIN
SIGHT
GLASSES
FILTER
DRIERS
TXV
CKT 1
8 DIAMS
MIN
SOLENOID COIL
EF680037
EF680037
Factory
High-Flow
Access Port
Service Valve
with Stem Cap
Fig. 7 — Typical Piping Connection Assembly
When connecting the field tubing to the 575J service valves,
wrap the valves in wet rags to prevent overheating. Pressure-
test all joints from outdoor unit connections over to the indoor
coil, using nitrogen as pressure and with soap-and-bubbles.
When pressure-testing is completed, remove the nitrogen source at
the outdoor unit service valves and re-install the two Schrader
valve cores. Torque the cores to 2-3 in.-lb (23-34 N-cm).
Where vapor line is exposed to outdoor air, line must be insu-
lated. See Table 7 for insulation requirements.
Table 7 — Insulation for Vapor Line Exposed to Outdoor
LENGTH OF
EXPOSED VAPOR LINE
ft
10
25
50
NOTE(S):
a. Recommended vapor line insulation for piping exposed to outdoor conditions
to prevent loss of heating during heating cycle. When vapor line goes through
interior spaces, insulation should be selected to prevent condensation on cool-
ing cycle. Heating capacity should be reduced 1000 Btuh (295 W) if over 35 ft
(11 m) of vapor line with 3/4 in. (19 mm) insulation is exposed to outdoor con-
ditions.
b. Closed cell foam insulation with a thermal conductivity of: 0.28 Btu • in./ft
(0.04 W/m • °C).
EVACUATION/DEHYDRATION
Evacuate and dehydrate the connected refrigeration system(s) (ex-
cluding the 575J unit) to 500 microns using a two-stage vacuum
pump attached to the service ports outside the 575J service valves,
following description in GTAC II, Module 4, System Dehydration.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures
than standard R-22 systems. Do not use R-22 service
equipment
or
components
equipment.
IMPORTANT: Charge in Cooling mode only!
11
SIGHT GLASS
KM680004
KM680005
Field Service
Access Port
(Schrader core)
Sweat
Connection
Conditions
INSULATION
a
THICKNESS
m
in.
3
3/8
8
1/2
15
3/4
WARNING
on
R-410A
b
mm
10
13
19
• h • °F
2
refrigerant
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