15
installation
&
operation
manual
|
ocle
/
ocla
heating
system
4.2.10 RESISTANCE TEMPERATURE
DEVICE (RTD)
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.
High-limit or control resistance temperature devices
(RTDs) sense temperature to either control fluid
temperature or protect the system and fluid from
overheating. To replace a resistance temperature device
(RTD), use the following procedures.
OOE:
Before removing and replacing an RTD,
ensure the RTD is malfunctioning.
See
SECOIO 4.2.9
.
1.
De-energize the heating system. Allow fluid to cool.
2.
Close isolation valves. Drain the fluid from the
heating tank. Locate the RTD that requires
replacement.
See Fig. 10
.
3.
Unscrew RTD enclosure cover and disconnect
RTD leads from wire connectors.
See Fig. 11.
4.
Unscrew RTD enclosure from RTD. For OCLA RTD
enclosure removal, both enclosures may need to be
removed for access.
5.
Unscrew RTD from tank.
See Fig. 11
.
6.
Screw replacement RTD to tank. Reconnect RTD
leads to wire connectors:
RTD LEAD
CONNECTOR
WIRE COLOR
white
TS(
1 or 2
):WHT
white
red
TS(
1 or 2
):RED
red
red
TS(
1 or 2
):RED
black
green
Ground (
W
)
bare/silver
7.
Screw RTD enclosure to RTD.
8.
To ensure proper installation and temperature
regulation, re-energize and operate heating system.
Refer to
SECOIO 3.3.1
for system start-up
procedures.
Figure 10. OCLE/OCLA high-limit RTD enclosures
(A)
and control
RTD enclosures
(B)
.
Figure 11. RTD plug.
A
B
