11
installation
&
operation
manual
|
dlv
heating
system
3
SYSTEM COMPONENTS AND OPERATION
The control box contains the electrical components for the heating system. The following is an operation
description for the standard parts located in the system, including:
•
on
/
off
/
prime
switch
•
Motor protection switch (MPS)
•
Pressure gauge
•
Pressure relief valve
•
Control TCR (temperature control relay)
•
High-limit TCR (temperature control relay)
OOE:
Parts in the control box may vary depending on the particular system configuration purchased.
3.1
ON/OFF/PRIME SWITCH
•
on
– The system is
on
.
•
off
– The system is shut
off
.
•
prime
– Turn and hold the switch to
prime
to energize the pump motor in order to remove any air
in the respective fluid system without energizing the elements.
3.2
MOTOR PROTECTION SWITCH (MPS)
The motor protection switch (MPS) protects the pump motor
from overloads. The MPS will be set at the full load amperage of
the motor when shipped from the factory. To reset the MPS, the
on
/
off
/
prime
switch must be switched to
off
and the operator
must press the MPS reset/on button.
See
SECOIO 5.1
.
RESET / ON
STOP / OFF
Figure 5. Motor protection
switches MPS1 (coolant)
and MPS2 (oil). To reset
the MPS, the heating
system must be switched
off and the reset/on
button must be pressed.