14
installation
&
operation
manual
|
ocle
/
ocla
heating
system
4.2.9 TEMPERATURE CONTROL RELAY
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.
If the OCLE/OCLA heating system does not maintain the
desired preset control temperature or signals a high-limit
temperature fault immediately upon system start-up,
the TCR (temperature control relay), the RTD (resistance
temperature device), or the RTD cable may require
replacement. To perform this troubleshooting, you
will need:
•
Ohmmeter
1.
De-energize the heating system. Verify fluid
is present and flow is not restricted. Check
temperature gauge to ensure the liquid in the tank
is below 122 °F (50 °C).
2.
Verify the control TCR is set correctly. Verify that
high-limit TCR is set at least 18 °F (10 °C) higher
than the control TCR set point.
3.
Using the ohmmeter, measure the resistance
between TCR terminals
O1
and
O2
(See Fig. 8)
:
h
If the measured resistance is
between 80 and
120 ohms
continue troubleshooting.
Proceed
to step 4.
h
If the resistance is
lower than 80 ohms
or
higher than 120 ohms
,contact HOTSTART
for further assistance.
4.
Using the ohmmeter, test for continuity between
TCR terminals
O2
and
O3
:
h
If there
is continuity
between TCR terminals
O2
and
O3
, the TCR, RTD and RTD cable are
functioning correctly. Close control panel.
Allow fluid to cool below high-limit preset
temperature. Perform system start-up
(see
SECOIO 4
)
. If fault or temperature problems
persist after start-up, contact HOTSTART for
further assistance.
h
If there
is no continuity
between TCR terminals
O2
and
O3
, locate connected RTD on the
heating tank. Unscrew the RTD plug from
RTD.
See Table 2 and Fig. 10, Fig. 11
on
following page.
5.
Using the ohmmeter, touch the probes to RTD
lead OS2:WHO (A)
and
lead OS2:RED (B)
.
See Fig.
9.
Note the resistance. Touch the probes to
lead
OS2:RED (B)
and
lead OS2:RED (C)
to check for
continuity:
h
If the resistance between RTD
lead OS2:WHO
(A)
and
lead OS2:RED (B)
is
between 80 and
120 ohms
and there
is continuity
between RTD
OS2:RED (B)
and
lead OS2:RED (C)
, the RTD is
functioning properly. Replace the RTD cable.
h
If the resistance between RTD
lead OS2:WHO
(A)
and
lead OS2:RED (B)
is
not between
80 and 120 ohms
or there is
no continuity
between lead OS2:RED (B)
and
lead OS2:RED
(C)
, the RTD is malfunctioning. Replace the RTD.
See
SECOIO 4.2.10.
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
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
Figure 8. Control and
high-limit TCRs showing
terminals T1, T2 and T3.
Figure 9. RTD leads and connectors shown on the RTD assembly,
TSX:WHT
(A)
, TSX:RED (red wire)
(B)
, TSX:RED (black wire)
(C)
, and
Ground
(D)
. Disconnect wire from connector as shown.
OS2EWHO
OS2ERTD
OS2ERTD
(
W
)
D
A
B
C
TCR
TYPE
RTD Position
TCR1
Coolant
Control
50 °C
Coolant Tank Inlet
TCR2
Coolant
High-limit
90 °C Coolant Tank Outlet
TCR3
Oil
Control
40 °C
Oil Tank Inlet
TCR4
Oil
High-limit
90 °C
Oil Tank Outlet
Table 2. TCR types, default temperature settings and
corresponding RTD positions.