3.2.3 HIGH-LIMIT TCR (TEMPERATURE
CONTROL RELAY)
The high-limit TCR (TCR2) is a protection device to
prevent fluid overheating. The high-limit TCR connects
to a second resistance temperature device (RTD) located
near the tank outlet. The default setting for the coolant
high-limit TCR is 90 °C (194 °F) and should always be at
least 10 °C (18 °F) higher than the control TCR set point.
The high-limit TCR hysteresis is not used in the high-limit
control.
3.3
HEATING SYSTEM START-UP
WARNING
!
Hazardous voltage:
Before wiring, servicing or cleaning
the heating system, turn off the power and follow your
organization’s lockout and tagout procedure. Failure to do
so could allow others to turn on the power unexpectedly,
resulting in harmful or fatal electrical shock.
NOTICE
Pump damage:
Do not run the motor/pump assembly
dry for more than five seconds at a time. Running a
pump that is not completely filled with fluid will cause
damage to the pump seal.
Proper heating operation:
The high-limit temperature
control relay (TCR2) must be set at least 10
°
C (18
°
F)
higher than the control temperature control relay (TCR1)
for proper heating operation. This will prevent nuisance
tripping of the high-limit circuit.
Seal damage:
Pump seal faces may adhere while in
storage. Before energizing the pump motor for the first
time, remove the pump shaft guards and rotate the shaft
by hand to ensure the seal faces move freely.
3.3.1 FIRST RUN PROCEDURE
1.
For three-phase applications, ensure a motor rotation
check has been performed prior to introducing fluid to
the pumps (
see
NOTE:
Single-phase motors are prewired at the
factory to ensure rotation in the correct
direction. If a single-phase pump motor
rotates in the incorrect direction, contact
Hotstart for re-wiring instructions.
2.
Check and tighten all electrical and plumbing
connections.
Figure 8. CMM/CLM motor protection switch (left), showing reset/
on
(A)
and
(B)
stop/off buttons. To reset the MPS, the heating system
must be switched off and the MPS reset/on button must be pressed.
CLM/CMM control TCR and high-limit TCR (above). The standard
setting for TCR1 coolant control dial
(C)
is 50 °C (122 °F). The
standard setting for TCR2 coolant high-limit dial
(D)
is 90 °C (194 °F).
B
A
C
D
B
A
C
D
Summary of Contents for CLM
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