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This system is NOT for use with oil based or
synthetic heat transfer fluids.
To avoid possible damage to the heaters do not
energize the heater unless the system is filled
with fluid.
EXPLOSION HAZARD. When heating in closed
vessels, controls and back-up controls must be
used to regulate build-up of temperature and/
or pressure.
Read manufacturer’s technical bulletins and instruc-
tions carefully.
If you are not sure you are using an accepted heat
transfer fluid, check with fluid manufacturer.
FIRE/EXPOSION HAZARD. This heater is not
intended for use in hazardous atmospheres
where flammable vapors, gases, liquids or
other combustible atmospheres are present as
defined in the National Electrical Code. Failure
to comply can result in personal injury or prop-
erty damage.
DO NOT mix heat transfer fluids unless authorized and
approved by the fluid manufacturer. All heat transfer
fluids are not compatible with each other, whether
made by the same manufacturer or a different manu-
facturer. If you plan to switch fluids, check with the fluid
manufacturer to determine the following.
A. Is the new fluid compatible with the old?
B. What is the recommended cleaning method to re-
move the old fluid, its sludge, or any deposits re-
maining in the system?
C. Does the fluid manufacturer have a reclaiming ser-
vice for used fluid? Do they have recommended
procedure for disposal of used or old fluid?
DO NOT allow heat transfer fluid to reach freezing tem-
peratures, as this can permanently damage system.
Fluid Compatibility
Unit Installation
Note: When installing system, allow sufficient room to
remove heating bundle.
Hydraulics
Note: The MWS systems should be mounted so the
control box does not fall in direct sunlight.
The bed plate should be mounted on a level, solid
foundation and bolted down.
1. Allow at least 1 foot or more around unit for proper
maintenance,
2. Unit is designed for 104˚F (40˚C) maximum operat-
ing environment.
3. Unit will be operating at elevated temperatures.
Proper care must be provided to ensure personnel
safety.
Piping Installation
1. The pipe size should be the same as the system
piping connections. All piping must be supported
so the pump is not carrying any of the pipe weight.
If these instructions are not followed, distortion in
the pump may cause unnecessary wear and faulty
operation.
2. The piping of the entire system should be arranged
to minimize pockets where air may be trapped.
Manual air vents or bleeder valves should be pro-
vided in the system where air pockets may occur,
or where the flow of fluid may drop.
3. Piping should be properly supported so pump can be
removed without changing the position of the piping.
If piping moves when the pump is removed, pump
malfunction is probably due to stresses and twist-
ing caused by the piping. These stresses will multiply
where the system is hot due to thermal expansion.
4. If there is a high differential pressure between the
inlet and outlet of the heat transfer system at oper-
ating temperature, this is probably due to a piping
restriction. A continuing high differential pressure
can cause excessive wear on the pump and pump
stuffing box packing or mechanical seal and will
eventually cause premature failure of the pump.
The major causes of restrictions are:
a. Inlet and outlet pipes smaller than provided on
the system.
b. Piping many processes in series with one another.
To reduce the pressure drop of the system, equip-
ment should be re-piped in balanced parallel flow.
DO provide for expansion and contraction of process
piping and connections to the system. Piping strains
can cause pump and motor misalignment, excessive
wear on pump body, bearings and stuffing box packing
or mechanical seal and will eventually cause failure of
the pump and system.