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Install Liquid Line Solenoid Valves
It is recommended that a bi-directional solenoid valve be
placed in the main liquid line (see Fig. 5 and 6) between the
outdoor unit and the indoor coil. Locate the solenoid valve at
the end of the liquid line, near the outdoor unit connections,
with flow direction arrow pointed at the outdoor unit. Refer to
Table 8. (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.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Failure
to
use
a
solenoid
P/N HN61PC005 may cause overload of Comfort Alert
Diagnostic Module (CADM) and compressor alarm
lock out.
TXV
Indoor
Sensing
Bulb
Coil CKT
15 Diams
Airflow
10
Min
Diams
LEGEND
TXV — Thermostatic Expansion Valve
Fig. 5 — Location of Sight Glass(es) and Filter Driers
(typical 575J size 07 and 08)
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
LEGEND
TXV — Thermostatic Expansion Valve
Fig. 6 — Location of Sight Glass(es) and Filter Driers
(typical 575J size 12)
CAUTION
valve
relay
Equalizer Line
Sight Glass
A Location
Filter Drier
A Location
TXV
8 Diams
Min
EQUALIZER LINE
SIGHT GLASS
LOCATION
TXV
FILTER DRIER
CKT 2
LOCATION
8 DIAMS
MIN
TXV
CKT 1
8 DIAMS
MIN
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.
(SVR)
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 9 for insulation requirements.
Table 9 — Insulation for Vapor Line Exposed to Outdoor
LENGTH OF
EXPOSED VAPOR LINE
ft
10
25
35
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
conditions.
b. Closed cell foam insulation with a thermal conductivity of: 0.28 Btu • in./ft
(0.04 W/m • °C).
11
Factory
High-Flow
Access Port
Field Service
Access Port
(Schrader Core)
Sweat
Connection
Conditions
INSULATION THICKNESS
a
m
in.
3
3/8
8
1/2
11
3/4
15
3/4
b
mm
10
13
19
19
2
• h • °F
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