TTA-R407C-EN1113
6
Refrigerant Piping Guidelines
Figure 1
Refrigerant Piping
To ensure the return of oil in the
refrigerant lines, it is necessary to
follow these recommendations:
1. Select the tube lengths with care
and try to avoid having a final few
meters of tube to use up. Refer to
table 2 for tube sizes.
2. Pitch all horizontal suction lines
down towards the unit to assist
gravity oil drainage back to the
compressor.
3. Avoid creating large oil traps in
horizontal suction lines as this will
reduce oil circulating in the system
and may eventually lead to failure
of the compressor.
4. A small oil trap at the end of a
horizontal suction line before a long
vertical riser (of more that 2.5
metres) has the advantage of
assisting the high velocity gas to
carry the oil up the vertical pipe.
5. The installation of a liquid line
sight is recommended. It is veryu
seful during the maintenance
procedures.
Refrigerant Piping Guidelines
A. Maximum recommended line
lengths: (per circuit)
Maximum linear length
200 Ft.
Maximum suction line lift
60 Ft.
Maximum liquid line lift
60 Ft.
B. Maximum allowable pressure
drops (R407C):
Suction line
6 psi.
Liquid line
35 psi.
(without subcooler)
Route refrigerant piping for
minimum linear length,
minimum number of bends and
fittings (no reducers) and minimum
amount of line exposed to outdoor
ambients.
C. Recommended line sizes:
TTA060FD (Single Circuit)
TTA075ED (Single Circuit)
TTA150ED (Dual Circuit)
Suction line
Liquid line
1 1/8 inch sealed type L
refrigerant tubing.
1/2 inch sealed type L
refrigerant tubing.
D. Recommended line sizes:
TTA100ED, TTA120FD and
TTA120ED (Single Circuit)
TTA180ED, TTA200ED and
TTA240ED (Dual Circuit)
Suction line
Liquid line
E. Recommended line sizes:
TTA150ED0G, TTA180ED0G,
TTA200ED0G, TTA240FD and
TTA240ED0G (Manifolded
Compressor) TTA150ED (New/
Single Circuit)
Suction line
Liquid line
1 3/8 inch sealed type L
refrigerant tubing.
1/2 inch sealed type L
refrigerant tubing.
1 5/8 inch sealed type L
refrigerant tubing.
5/8 inch sealed type L
refrigerant tubing.
Note:
Insulate all refrigerant piping
and connections.
Table 2 - Recommended Interconnecting Lines
(W/o accumulator)
TTA 060 FD
1/2
1 1/8
1/2
1 1/8
1/2
1 1/8
1/2
1 1/8
TTA 120 FD
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
TTA 240 FD
1/2
1 3/8
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
Length of Interconnecting Line (feet)
0-20 21-40
41-60
61-80
Liq. Suct. Liq. Suct. Liq. Suct. Liq. Suct.
TTA 075 ED
1/2
1 1/8
1/2
1 1/8
1/2
1 1/8
1/2
1 1/8
TTA 100 ED
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
TTA 120 ED
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
Model
TTA 150 ED
1/2
1 1/8
1/2
1 1/8
1/2
1 1/8
1/2
1 1/8
TTA 180 ED0G
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
TTA 200 ED0G
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
TTA 240 ED0G
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
TTA 180 ED
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
TTA 200 ED
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
TTA 240 ED
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
1/2
1 3/8
TTA 150 ED0G
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
Notes: 1. Two line sets are required for dual circuits units.
2. For line lengths over 80 linear feet and 15 feet liquid line riser,
consult your local Trane representative.
TTA 150 ED (New) 5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
5/8
1 5/8
TUBE CONNECTON
CAP
CHARGING
PORT
CAP VALVE PORT
BODY (FORGED)
TUBE CONNECTON
O - RING
O - RING
SEAL
PLUNGER
VALVE CORE
TTA-R407C-EN1113.indd 6
TTA-R407C-EN1113.indd 6
12-Sep-16 13:28:23
12-Sep-16 13:28:23
