Hotstart CLM, Installation & Operation Manual

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11
installation
&
operation manual
|
cmm
/
clm heating system
4.2.4 SYSTEM DRAINING
Use the following points for draining purposes ( see
SECTION 4.2.11
and
SECTION 4.2.12
):
•
Coolant tank plug (A)
4.2.5 MAGNETIC CONTACTORS
Magnetic contactors are used to control motors and
heating elements in Hotstart heating systems. The
contactor coils operate at the system’s nameplate control
voltage. To test for failure, check for continuity across
the coil connections (A1 and A2); an open or direct-short
reading indicates a failed contactor coil.
With power disconnected, verify that the mechanism of
the contactor moves freely and is not stuck in an open
or closed position. With the contacts held closed, check
for unusually high resistance across the main poles.
For contactors with screw terminals, verify that all wire
connections are properly tightened.
Magnetic contactors have finite life cycles, as they
contain moving parts and electrical contacts that will
wear out with use. Replace contactors that develop
functional problems or show obvious external signs
of heat damage. Hotstart recommends that element
contactors be replaced at least every five years as a
preventative maintenance measure.
NOTE: Higher-current systems or systems operating in
high ambient temperatures may require more
frequent contactor replacement.
4.2.6 PUMP SEAL
If seal becomes worn, replacement pump seals are
available. To improve pump seal longevity, ensure
the supply line does not restrict flow excessively ( see
SECTION 2.1.1).
NOTE: Instructions to replace the pump seals are
included with replacement seal kits.
4.2.7 PRESSURE RELIEF VALVE
The pressure relief valve on coolant systems must be
periodically checked and replaced when appropriate.
At a minimum, the valve should be removed from the
system, checked for deposits and corrosion, and tested
to ensure that it relieves the proper pressure.
4.2.8 PRESSURE/ TEMPERATURE
GAUGE
The pressure/temperature gauge will indicate a pressure
increase when the respective pump motor is engaged
by pressing the
prime
button or during normal heating
system operation. The gauge will also indicate the
current fluid temperature. No maintenance for this part
is required.
4.2.9 VOLATILE CORROSION
INHIBITOR
A volatile corrosion inhibitor (VCI) is provided with each
control box and should be replaced once a year.
NOTE: Heating systems placed in extended storage
will require the VCI to be replaced at six month
intervals. See SECTION 4.4 .
A
Figure 10. CMM/CLM, showing drain plug (A) at coolant tank.