CCI Thermal Technologies CPXD - Control Panel for XDF Duct Heater - Manual (Page 3)

After all connections have been made and before
starting up the system, ensure that all housings,
plugs, covers, etc. have been installed.
7.0 STARTUP AND OPERATION
T O ENSURE SAFE AND RELIABLE OPERATION,
DO NOT EXCEED THE MAXIMUM OUTLET
TEMPERATURE OF 40°C AND DO NOT ALLOW
THE AIRFLOW TO DROP BELOW THE MINIMUM
AIRFLOW AS SHOWN ON THE PRODUCT
NAMEPLATE.
7.1 Turn on the airflow through the duct heater. Ensure that
the minimum airflow, as shown on the product nameplate, is
maintained at all times.
7.2 The field installed explosion-proof differential pressure switch
may require field adjustment. Consult manufacturer’s operation
instructions included with this manual.
THE PRESSURE DIFFERENTIAL SWITCH IS A CRITICAL
SAFETY COMPONENT. IMPROPER SETTING OF THE SWITCH
MAY RESULT IN HAZARDOUS CONDITIONS.
7.3 Apply power to the control panel.
7.4 Turn the control on/off switch to “On”.
7.5 Set the temperature controller to the desired set point. Do not
exceed the maximum outlet temperature of 40°C.
7.6 Ensure that the temperature controller is working properly.
Consult the manufacturer’s operation instructions supplied with the
temperature controller.
7.7 Except when purchasing a control panel to accompany your
XDF heater, the high limit set points must be set in the field. Table
2 gives the maximum high limit set points for safe operation of the
heater. For initial start-up, set the high limit controllers to the values
indicated in Table 2.
TO PREVENT UNSAFE OPERATION OF THE
HEATER, DO NOT EXCEED THE MAXIMUM
HIGH-LIMIT SET POINTS. OPERATION OF
THE HEATER WITH HIGH LIMIT SET POINTS
GREATER THAN THOSE SHOWN IN TABLE 2
CREATES A SIGNIFICANT RISK OF EXPLOSION.
Table 2 - Maximum High Limit Set Points
6.0 WIRING
Whenever hazardous materials are present,
ensure that the terminal housing covers, plugs,
etc., are secured (but not overtightened) before
energizing the heater.
All circuits must be in the open position before
removing junction or terminal box covers.
Use supply wires suitable for 90°C. Supply wires
are to be fused with appropriately sized HRC
fusing.
Use approved conduit and conduit seals as
required by hazardous location standards.
Ensure that no power is connected to the
equipment prior to making any connections.
6.1 The heater is factory prewired to supply terminal blocks in the
heater terminal housing ready for direct connection to the power
supply. The heater also contains one (1) high limit thermocouple
per heating bank that must be wired to the control equipment.
For double bank heaters, Heater Bank #1 is defined as the
inlet bank and Heater Bank #2 is defined as the outlet bank.
This distinction is important in order to ensure proper high
limit set limit set points must be set in the field. Table 2 gives
the maximum high limit set points for safe operation of the
heater. For initial start-up, set the high limit controllers to the
values indicated in Table 2.
6.2 To wire the heater to the control equipment, make the following
connections at the connection points indicated on the assembly
drawing:
a) 1¼” NPT conduit entries have been provided in each heater
terminal housing for wiring the power supply and ground to
the heaters. Connect the heating bank(s) to the contactor(s)
in the control panel.
b) ¾” NPT conduit entries have been provided on each heater
bank for wiring the J type high limit thermocouple(s) to
Certified, manual-reset high limit controller(s) in the control
panel. Using appropriate thermocouple extension wire,
connect the thermocouple(s) to the high limit controllers,
ensuring proper connection of the positive and negative
leads.
c) Connect the “Normally Open” contacts of the supplied
pressure differential switch to the interlocks in the control
circuit.
MI289 REV.2.01 Page 3 of 4
CCI Thermal Technologies Inc. 2721 Plymouth Drive, Oakville, ON L6H 5R5 Tel. (905) 829-4422 Fax (905) 829-4430
www.ccithermal.com
Temperature Code
Heater Bank #1 (Inlet)
Heater Bank #2 (Inlet)
T2D T3A T3B
201 (94) 172 (78) 149 (65)
257 (125) 212 (100) 181 (83)
High Limit Set-Point °F (°C)