Technical information

Page: 72
VL Series Portable Chillers, 2 to 40 Tons UGH021/0301
8.7 OVERHEAD PIPING KIT
A. Conair portable chillers have between a 4.5 to 60 gallon reservoir
capacity (depending on chiller size). When a Conair portable chiller
is used with overhead piping, the chiller tank will overflow upon
shut-down due to the drainback of water volume from the overhead
piping system (which exceeds the tank capacity of the chiller). If the
piping arrangement is not above the chiller tank level, then this
problem will not exist.
B. To prevent tank overflow, an overhead piping kit should be
installed. This kit is available from Conair as an option and factory
installed, or can be field retrofitted.
C. The overhead piping kit places a solenoid valve on the FROM
PROCESS line and a check valve on the TO PROCESS line. The
solenoid valve is activated by an auxiliary contact on the process
pump motor starter.
D. During operation, when the pump is on, the solenoid valve on the
FROM PROCESS line opens to allow flow to the chiller. The check
will open due to the flow generated by the pump on the TO
PROCESS line.
E. During shut down, the solenoid valve will close preventing flow to
the tank. The check valve will close as well. With both valves closed,
water in the overhead piping system can not flow back to the
chiller causing the chiller to overflow.
WATER REGULATOR VALVE
COOLANT PUMP
TO PROCESS
SENSOR PROBE
TO PROCESS
PORT CONNECTION
MAKE-UP PORT
CONNECTION (OPTIONAL)
MAKE-UP
SOLENOID VALVE
(OPTIONAL)
LEVEL SWITCH
(OPTIONAL)
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
SOLENOID VALVE
CHECK VALVE