11
installation
&
operation
manual
|
ocle
/
ocla
heating
system
The oil pump pressure relief valve is internal to the pump
and releases pressure from the discharge side of the
pump to the suction side of the pump at 75 psi (525
kPa). No plumbing for this component is required. The
pressure relief valve cap must always point toward the
inlet side of the pump.
The OCLE/OCLA heating system is designed to not
exceed 125 psi (862 kPa); however, the oil pump will not
exceed 75 psi (517 kPa). In the event the pressure relief
valve is activated, the pump will continue to produce
flow, but will not exceed a pressure of 75 psi (517 kPa).
3.2
SYSTEM COMPONENTS
3.2.1 MOTOR PROTECTION SWITCH
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
local
/
off
/
remote
switch must
be switched to
off
and the operator must press the
reset
button or press the MPS reset/on button
(B)
.
See
Fig. 7
. For additional troubleshooting,
see
SECOIO 4.5
.
3.2.2 CONTROL TCR (TEMPERATURE
CONTROL RELAY)
The control TCRs (TCR1 and TCR3)are used to control
the temperature of the corresponding fluid. The control
TCR uses a resistance temperature device (RTD) to sense
the temperature of the fluid as it enters the heater. The
standard setting for the coolant control temperature relay
(TCR1) is 122 °F (50 °C). The standard setting for the oil
control temperature relay (TCR3) is 104 °F (40 °C).
See Fig. 7
.
3.2.3 HIGH-LIMIT TCR (TEMPERATURE
CONTROL RELAY)
The high-limit TCRs (TCR2 and TCR4) are a protection
device to prevent fluid overheating. The high-limit TCR
uses a resistance temperature device (RTD) located near
the tank outlet. The default setting for the coolant and oil
high-limit TCR is 194 °F (90 °C) and should always be at
least 18 °F (10 °C) higher than the corresponding control
TCR set point. The high-limit TCR hysteresis is not used
in the high-limit control.
See Fig. 7
.
Figure 7. OCLE/OCLA motor protection switch (left), showing stop/
off
(A)
and reset/on
(B)
buttons. To reset the MPS, the heating
system must be switched off and either the
reset
button or the
MPS reset/on button must be pressed.
OCLE/OCLA control TCR and high-limit TCR (left). The standard
setting for TCR1 coolant control dial
(C)
is 122 °F (50 °C). The
standard setting for TCR3 oil control dial
(D)
is 104 °F (40 °C).
TCR4
TCR3
TCR2
TCR1
HIGH LIMIT
OIL
CONTROL
OIL
HIGH LIMIT
COOLANT
CONTROL
COOLANT
0
0
0
0
MPS1
MPS2
C
T1
T2
T3
L1
L2
L3
T1
T2
T3
L1
L2
L3
13
14
13
14
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
A
B
D
TCR4
TCR3
TCR2
TCR1
HIGH LIMIT
OIL
CONTROL
OIL
HIGH LIMIT
COOLANT
CONTROL
COOLANT
0
0
0
0
MPS1
MPS2
T1
T2
T3
L1
L2
L3
T1
T2
T3
L1
L2
L3
13
14
13
14
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
TCR4
TCR3
TCR2
TCR1
HIGH LIMIT
OIL
CONTROL
OIL
HIGH LIMIT
COOLANT
CONTROL
COOLANT
0
0
0
0
MPS1
MPS2
C
T1
T2
T3
L1
L2
L3
T1
T2
T3
L1
L2
L3
13
14
13
14
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
A3
A1
T2
T3
T1
11
12
A2-
14
13
A
B
D
