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SPECIAL PIPING WITH 4 SPLITS PER COIL
Manifolding for 2-Face Splits
Refer to Fig. 110 and externally manifold as follows:
1. Connect the 4 expansion valves to the 4 distributors on
each coil and connect the 4 suction lines to the 15-diame-
ter-long risers as outlined in previous piping instructions.
2. Install common liquid line for upper face split to first
(upper) and second expansion valves. Also, install a com-
mon suction line from suction lines attached to first (up-
per) and second suction header connections.
3. Repeat Step 2 for lower face split using third and fourth
distributor and suction connections.
Manifolding for 2-Row Splits
Refer to Fig. 111 and externally manifold as outlined for the 2-face
splits with the following exceptions:
1. Manifold in pairs, the first and third coil connections for
one split.
2. Manifold the second and fourth pairs of coil connections
for the other split.
Note: Split section using first and third pairs of coil connec-
tions should be first-on, last-off.
Hot Gas Bypass Connection with 4 Splits per Coil
For either face or row splits connect a hot gas bypass auxiliary
side connector to each distributor of coil split that is first-on, last-
off. Refer to installation instructions for Hot Gas Bypass.
SPECIAL PIPING FOR DOUBLE-CIRCUIT COILS
All 8-row coils that are double circuited require special piping
to manifold suction and liquid lines. See Tables 5-7 for
detailed coil data.
SUCTION LINE
FOR COIL
CONNECTIONS
SUCTION LINE
FOR COIL
CONNECTIONS
LEGEND
TXV — Thermostatic Expansion Valve
TXV SENSING
BULBS
AIRFLOW
TXV SENSING
BULBS
Fig. 110 — Face-Split Coil Manifolding (Typical)
Manifolding for 2-Face Splits
Refer to Fig. 110 for coils with less than 34 tubes in face. External-
ly manifold as follows:
1. Coils with less than 34 tubes: Connect the 4 expansion
valves to the 4 distributors on each coil and connect the
4 suction lines to the 15-diameter-long risers as outlined
in previous piping instructions. Refer to Fig. 110.
2. Install common liquid line for upper face split to first (up-
per) and second expansion valves. Also, install a common
suction line from suction lines attached to first (upper)
and second suction header connections.
3. Repeat Step 2 for lower face split using third and fourth
distributor and suction connections.
4. For units with two coils repeat procedures of Steps 1, 2
and 3 for second coil.
Manifolding for 2-Row Splits
Refer to Fig. 111 for coils with less than 34 tubes in face. External-
ly manifold as outlined for the 2-face splits with the following ex-
ceptions:
1. Manifold in pairs, the first and third coil connections for
one split.
2. Manifold the second and fourth pairs of coil connections
for the other split.
Note: Split section using first and third pairs of coil connec-
tions should be first-on, last-off.
Hot Gas Bypass Connection for Double-Circuited Coils
For either face or row splits connect a hot gas bypass auxiliary
side connector to each distributor of coil split that is first on, last
off. Refer to installation instructions for Hot Gas Bypass.
1
2
1
2
3
4
3
4
142
SIGHT GLASS
SOLENOID VALVE (TYP)
FILTER
DRIER
LIQUID LINE
FOR 1 AND 2
TXV INSIDE CASING (TYP)
DISTRIBUTOR (TYP)
FILTER
DRIER
LIQUID LINE
FOR 3 AND 4
a39-4294
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