UNITS
and
(See Fig. 1.)
Line
Connect the field-supplied line to the
factory-provided stubs in the discharge line
the
circuit no. 1 compressor and in the
no.
line,
between expansion valve and cooler (stubs are sealed
from factory).
Bypass Valve
Install the valve in the
line as
close to the cooler as possible. This
liquid
storage between valve and cooler when valve is closed
and prevents flood of liquid refrigerant when the valve
opens.
To
ensure proper closing, install the bypass valve
in a horizontal section of the bypass line, with the pilot
valve installed vertically (coil on top).
Solenoid Pilot Valve
Install on the bypass valve at the
external equalizer
OD sweat connection). The
outlet side of the pilot valve is a
SAE thread. Run
a
OD tube from this connection to the thermo-
static expansion valve (TXV) equalizer line, If the
connection is made directly to the TXV, use a
FL
x
female flare tee. If the connection is made into
the equalizer line, use a standard
FL tee.
UNITS,
(See Fig. 2.)
Bypass Line
Install field-supplied line between the
header on inlet side of lead coil and the entrance to the
cooler. Two factory-sealed stubs are provided in each
circuit, one on the lead coil header and one on the liquid
line between the Flotronic expansion valve (EXV) and
the cooler.
NOTE: The 30GB 1
units have 2 stubs in the high
side of each circuit, one on each lead coil header; it is
necessary to connect piping to only one of these stubs.
Bvpass Valve
Install the valve in the bypass line as
close to the cooler as possible. This minimizes liquid
storage between the valve and cooler when valve is
closed and prevents flood of liquid refrigerant when the
valve opens.
To ensure proper closing, install the by ass
valve in a horizontal section of the bypass line, wit
the
pilot valve installed vertically (coil on top).
Solenoid Pilot Valve
Install on the bypass valve at
the external equalizer. The outlet side of the pilot valve is
a
SAE thread. Run a
OD tube from this
connection to the suction valve of the lead compressor
in the circuit.
SUCTION LINE VALVE
EXV- ELECTRONIC EXPANSION VALVE
TXV- THERMOSTATIC EXPANSION VALVE
PIPING
PIPING
NOTE: Circuit 2 should be piped same as circuit 1. The
tube should be connected to the lead compressor in both circuits.
CKT
CKT
CKT
CKT
CKT
CKT
CKT
CKT
CKT
q 2pJ
0 6 0
0 7 5 , 0 8 0
090,100
110,125
CKT
CKT
q
ma
q l2Jlml-g
2 0 0
Compressor numbers, viewed facing compressor side of unit.
Fig. 2
Schematic Piping;
with Electronic Controls (Flotronic)
2
