6
Before proceeding with the installation of the Closed-
loop system, please take note of the following informa-
tion:
1. Reduced diameter fittings may be used if they do
not reduce flow rate and increase pressure drop
significantly. Galvanized steel unions are recom-
mended at all connections.
2. If water pressure falls below 20 psi, a pressure
switch will interrupt pump motor and heater op-
eration. Use an external water pressure regulator
and back pressure relief valve or regulator set at
maximum 125 psi (150 psi with 7.5 hp motor) con-
nected in the external fill line, to reduce excessive
water pressure. Not provided with CMX-180 mod-
els.
HAZARD OF EXPLOSION, FIRE AND SCALDING
BURNS. To avoid excessive pressures, do not
connect any valves or obstructions which could
prevent free discharge from relief valve in a
safe manner. Route line so water drains com-
pletely. Do not allow drain to freeze or corrode
shut.
Do not install a check valve on the fill line. The
inability of the system to flow back into the
fill line can lead to excessive pressure. If back
flow preventer or check valve is required, in-
stall back pressure regulator rated for 250°F
water with a pressure setting of 30 to 80 psi.
Back pressure regulator setting must be ap-
proximately 10 psi above water supply pres-
sure to minimize water flow directly from sup-
ply to drain.
Hydraulic Installation Closed-Loop
1. Locate the unit as close as possible to the con-
trolled process in order to minimize pressure
drops. Make sure the unit is sitting on a solid, level
foundation.
2. Using 1 1/4” NPT or larger schedule 40 pipe (flex-
ible hose suitable for 150 psi and 250°F minimum
service conditions can be used), connect the 1
1/4” NPT “FROM PROCESS” and “TO PROCESS”
ports to the mold, mold manifold, or other process.
3. Pipe the entire system to minimize air pockets.
Provide air bleed valves at high points and drains
at low points.
4. Connect the cooling water supply (30 psi to 80 psi)
to the unit’s 1/2” NPT “WATER SUPPLY/COOLING
INLET” port with suitable pipe or hose.
5. Connect the 1/4” NPT port identified as “COOL-
ING OUTLET” to a cooling water return line or plant
drain that contains no valves or obstructions that
could impede discharge. Review the condition of
potential hot water going down a plant drain. Verify
that local codes and materials are acceptable for
this service. Temperature of discharge water could
reach 250°F and create steam at atmospheric
pressure.
Heater
Temperature Controller
Cooling Outlet
(1/2 NPT)
From Process
(1-1/4 NPT)
Water Supply/
Cooling Inlet
(1/2 NPT)
Auto
Air Bleed
Pressure
Relief
Valve
Therocouple
Probe
To Process
(1-1/4 NPT)
Solenoid
Valve
Pump and
Motor
Figure 2.3 Closed-Loop System Piping
Before Closed-Loop Hydraulic Installation
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com