CCI Thermal Technologies MX - Pipe-Insert Immersion Heater - Manuel (Page 2)

CCI Thermal Technologies Inc. 2767 Brighton Road, Oakville, ON L6H 6J4 Tel. (905) 829-4422 Fax (905) 829-4430
www.ccithermal.com
MI134 REV. 5
Page 2 of 3
12.0 Heaters for use in hazardous locations require special terminal
housings (check factory).
13.0 Check that all connections are tight.
14.0 If a thermostat is provided, verify that it is operating properly
by cycling it and verifying cutout.
15.0 Perform an IR test prior to energization and verify that levels
are acceptable 500,000 ohms.
16.0 Energize the heater and check for signs of hot spots in the
electrical connections or vessel.
17.0 Retorque all bolted fitting connections and all electrical
connections after 10 cycles.
18.0 Always maintain a minimum of 76 mm (3”) of liquid above the
heated portion of the element or element failure may result.
19.0 Heating elements should be kept above sediment deposits or
it may overheat and shorten life expectancy.
MAINTENANCE
Disconnect all power before installing or
servicing the heater. Failure to do so could result
in personal injury and/or property damage. All
maintenance and installation should be done by
qualified personnel in compliance with local
codes.
20.0 Heaters stored for prolonged periods may absorb moisture.
Using a 500VDC megger (insulation resistance tester) check the value
of the insulation resistance to ground for each circuit. Initial readings
of over 500,000 ohms to ground are normally acceptable. Should
lower readings be observed, check factory for instructions.
21.0 Periodically check electrical connections for tightness and
check wire insulation for any damage and replace if necessary.
22.0 Remove the immersion heater periodically to inspect for
corrosion, sludge build-up and for scale removal. Do not continue to
use a heater showing visible signs of damage.
9.0 In immersion heating systems:
a) The insert pipes should be totally sealed from the tank liquid.
Sealing integrity should be verified by pressure testing at the
point of fabrication of the tank.
b) Standard pipe insert immersion heaters have a 150 mm (6”)
cold section past the screwplug or mounting flange. Insert
pipe nozzle extensions on the outside of the tank should be
150 mm (6”) or less.
c) If possible, maintain a separation of 190 mm (7½”) minimum
between the insert pipes. For tanks requiring many pipe
heaters it may be useful to install a second layer of pipes at
right angles to the first layer.
d) Insert pipes should not extend through the tank wall on both
ends. It is best that the immersed ends be supported in a
cradle which is designed to permit thermal expansion.
e) Insert pipes should be spaced about 150 mm (6”) from the
tank bottom and 76 mm (3”) below the minimum tank level.
OPERATION
RISK OF EXPLOSION. Do not operate heater at
voltages higher than the rating specified on the
nameplate. Failure to do this will cause elevated
temperatures.
For metal sheathed heaters, prior to operation
an insulation resistance check must be
performed. Heater with values less than .5 MΩ
Ω Ω Ω Ω
should follow a drying process. Please contact
factory for details on procedure if heater is under
.5 MΩ
Ω Ω Ω Ω.
Heaters are designed to operate in an air
medium. System design should consider
pressure and temperature control if other
mediums are used.
Low megohm on heating elements with epoxy
or hermetic seals cannot be serviced in the
field. Typical resistance values when sealed are
1000 MΩ
Ω Ω Ω Ω or greater.
10.0 A line voltage or pilot duty thermostat should be used to control
the heater. The pilot duty thermostat must be used with a contactor
and (if required) a transformer. Generally, heaters supplied with built-
in thermostats will be factory prewired if suitable for line voltage
operation. Integral thermostats not factory prewired are usually
intended for pilot duty.
11.0 High temperature limit controls are recommended for safe
operation and heater protection. Limit controls are available with a
built-in mechanical type limit or a thermocouple. These controls will
sense air temperature inside the pipe which will be much higher
than type it should be set at 600°F in most cases; if using a high
limit thermocouple control the temperature setting on the remote
temperature controller should be 800°F in most cases. Should the
liquid level drop below the pipe(s) the temperature within the pipe will
tend to rise and will trigger a high limit condition.