Technical information

UGH021/0301 VL Series Portable Chillers, 2 to 40 Tons
Page: 71
8.6 LOW FLOW BYPASS CIRCUITS
A. In cases of restricted flow or reduced capacity conditions, as an
option Conair supplies manual or automatic low flow bypass
circuits on water cooled or air cooled portable chillers. It is
recommended that where low flow conditions exist, a bypass
system be installed either in the field or by Conair. It is the ultimate
responsibility of the user to make sure adequate flow through the
evaporator is achieved.
B. The low flow bypass circuit, whether automatic or manual, is
designed to provide the chiller with the proper amount of flow
through the chiller’s evaporator continually. This prevents default on
the low flow safety switch in times of restricted flow or reduced
capacity.
C. AUTOMATIC low flow bypass circuits place a pressure actuated
valve between the from process and to process lines. Conair presets
the valve to open at the pump’s dead head pressure to prevent
overloading and to provide proper flow to the evaporator at all
times.
D. MANUAL low flow bypass circuits place a ball valve between the
from process and to process lines. The valve is shipped in the closed
position. The valve is then field adjusted based on process
requirements.
WATER REGULATOR VALVE
COOLANT PUMP
TO PROCESS
SENSOR PROBE
TO PROCESS
PORT CONNECTION
FROM PROCESS
PORT CONNECTION
CONDENSER WATER IN
PORT CONNECTION
CONDENSER WATER OUT
PORT CONNECTION
RESERVOIR TANK
EXPANSION VALVE
EVAPORATOR
SERVICE LID
REFRIGERANT
SIGHT GLASS
LIQUID LINE
SOLENOID VALVE
FILTER-DRIER
HOT GAS
BYPASS VALVE
COMPRESSOR
HIGH PRESSURE
SAFETY SWITCH
LOW PRESSURE SAFETY SWITCH
WATER COOLED CONDENSER
AUTOMATIC BYPASS
PRESSURE ACTIVATED VALVE
WATER MAKE-UP
CONNECTION
(OPTIONAL)
MAKE-UP
SOLENOID VALVE
(OPTIONAL)
LEVEL SWITCH
(OPTIONAL)
WATER REGULATOR VALVE
COOLANT PUMP
TO PROCESS
SENSOR PROBE
TO PROCESS
PORT CONNECTION
FROM PROCESS
PORT CONNECTION
MANUAL BYPASS VALVE
CONDENSER WATER IN
PORT CONNECTION
CONDENSER WATER OUT
PORT CONNECTION
RESERVOIR TANK
EXPANSION VALVE
EVAPORATOR
SERVICE LID
REFRIGERANT
SIGHT GLASS
LIQUID LINE
SOLENOID VALVE
FILTER-DRIER
HOT GAS
BYPASS VALVE
COMPRESSOR
HIGH PRESSURE
SAFETY SWITCH
LOW PRESSURE SAFETY SWITCH
WATER COOLED CONDENSER
WATER MAKE-UP
CONNECTION
(OPTIONAL)
MAKE-UP
SOLENOID VALVE
(OPTIONAL)
LEVEL SWITCH
(OPTIONAL)
AUTOMATIC BYPASS DIAGRAM
MANUAL BYPASS DIAGRAM