Carrier AERO 39MN Installation, Start-Up And Service Instructions Manual page 88

SPECIAL PIPING WITH 4 SPLITS PER COIL
Manifolding for 2-Face Splits — Refer to Fig. 75 and exter-
nally 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-diam-
eter-long risers as outlined in previous piping instruc-
tions.
2. Install common liquid line for upper face split to first
(upper) 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.
Manifolding for 2-Row Splits — Refer to Fig. 76 and exter-
nally manifold as outlined for the 2-face splits with the fol-
lowing 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.
Fig. 74 — Distributor and Hot Gas Bypass Auxiliary Side Connector
AIRFLOW
SUCTION LINE
FOR COIL
CONNECTIONS
SUCTION LINE
FOR COIL
CONNECTIONS
LEGEND
TXV — Thermostatic Expansion Valve
DISTRIBUTOR
TXV SENSING
BULBS
TXV SENSING
BULBS
Fig. 75 — Face-Split Coil Manifolding (Typical)
87
Hot Gas Bypass Connection with 4 Splits per Coil — For ei-
ther 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 3 and 4 for
detailed coil data.
Manifolding for 2-Face Splits — Refer to Fig. 75 for coils
with less than 34 tubes in face. Externally manifold as fol-
lows:
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. 75.
2. Install common liquid line for upper face split to first
(upper) 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.
DISCARD CAP
WITH TESTPORT
1
2
1
2
TXV INSIDE CASING (TYP)
3
4
3
4
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SIDE
CONNECTOR
SIGHT GLASS
SOLENOID VALVE (TYP)
FILTER
DRIER
LIQUID LINE
FOR 1 AND 2
DISTRIBUTOR (TYP)
FILTER
DRIER
LIQUID LINE
FOR 3 AND 4
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