Special Piping With 4 Splits Per Coil - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

SPECIAL PIPING WITH 4 SPLITS PER COIL

Manifolding for 2-Face Splits — Refer to Fig. 110 and external-
ly 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 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 with 4 Splits per Coil — For either
face or row splits connect a hot gas bypass auxiliary side connec-
tor 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 —
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. Externally 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. 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 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.
All
Refer to installation instructions for Hot Gas Bypass.
1
2
3
4
135
SIGHT GLASS
1
SOLENOID VALVE (TYP)
2
FILTER
DRIER
LIQUID LINE
FOR 1 AND 2
TXV INSIDE CASING (TYP)
3
DISTRIBUTOR (TYP)
4
FILTER
DRIER
LIQUID LINE
FOR 3 AND 4
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