135
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 — 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.
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.
Refer to installation instructions for Hot Gas Bypass.
AIRFLOW
TXV SENSING
BULBS
TXV SENSING
BULBS
SUCTION LINE
FOR COIL
CONNECTIONS
SUCTION LINE
FOR COIL
CONNECTIONS
FILTER
DRIER
FILTER
DRIER
TXV INSIDE CASING (TYP)
DISTRIBUTOR (TYP)
SIGHT GLASS
SOLENOID VALVE (TYP)
LIQUID LINE
FOR 1 AND 2
LIQUID LINE
FOR 3 AND 4
1
2
3
4
1
2
3
4
a39-4294
LEGEND
TXV —
Thermostatic Expansion Valve
Fig. 110 —
Face-Split Coil Manifolding (Typical)
