BriskHeat SLCBL Serie Manual De Instrucciones De Instalación Y Mantenimiento página 15

SYMPTOMS PROBABLE CAUSE
C. Power output is zero or 1. Low or no input voltage.
lower than rated.
2. Circuit is shorter than design shows.
***
a. Splices or tees may not have been
connected.
b. Heating cable may have been
severed.
3. Improper crimping causing a high resistance
connection.
4. Control thermostat is wired in the opened
position.
5. Pipe is at an elevated temperature.
6. Heating cable has been exposed to
excessive moisture.
7. Heating cable has been exposed to
excessive temperatures.
D. Power output appears 1. Insulation is wet.
correct but pipe
temperatures are
2. Insufficient heating cable was used on
below design value.
valves, supports, and other heat sinks.
3. Thermostat was set incorrectly.
4. There are thermal design inconsistencies.
*** The power output on lower resistance heating cables is temperature sensitive and requires a special procedure to determine it's
value.
1. Check the pipe temperature under the thermal insulation.
2. Allow heating cable to stabilize for 10 minutes and then measure the current.
3. Calculate the power (watts / ft.) of the heating cable by multiplying the current by the input voltage and dividing by the actual
circuit length
4. Compare this measured value to the power output curves for the heating cable at the measured pipe temperature. If the
heating cable's actual output is substantially below the theoretical output, the bus wire interface with the core has been
damaged by the fault current and the cable must be replaced. This is not a highly accurate method of analysis, so use
discretion in comparing theoretical and actual values.
®
© BriskHeat
Self Regulating Heating Cable
CORRECTION
1. Repair electrical supply lines and equipment.
2. Check routing and length of heating cable
(use "as-builts"), and recalculate power
requirements.
a. Connect and recheck the power.
b. Locate and repair the damaged heating
cable. Recheck the power.
3. Re-crimp using correct procedure.
4. Rewire in the normally closed position.
5. Check pipe temperature and recalculate the
output.***
6,7. Replace the heating cable.
1. Remove and replace with dry insulation and
insure proper weatherproofing.
2. Splice in additional heating cable but do not
go over maximum circuit length.
3. Reset the thermostat.
4. Check with the local or factory representatives
for design conditions. Modify as
recommended.
I xV = Watts
Ft. Ft.
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29
HEAT TRACE INSTALLATION RECORD
1. Circuit No._______________________________
2. Receiving Documentation
Item
A. Cable Type
B. Cable Length
3. Receiving Testing
A. Check for physical damage
B. Continuity Check
Check for continuity between power leads.
C. 500VDC min., 2500VDC recommended,
megger check between leads and
sheath, 20 megohms min.
D. Lot No.
4. Post Installation Testing
A. Continuity Check
Check for continuity between cold leads.
B. 500VDC min., 2500VDC recommended,
megger check between leads and
sheath, 20 megohms min.
C. Visually Check Cable Installation Prior to
Release for Thermal Insulation.
5. Final Testing and Commissioning
A. Circuit approved for testing by client.
B. 500VDC min., 2500 VDC recommended,
megger check between leads and
sheath, 20 megohms min.
C. Energized Testing
(all test data to be within 10% of design data)
1. Circuit Voltage
2. Initial Current
3. Current after 15 minutes of operation
4. Current after 30 minutes of operation
5. Pipe temperature
6. Circuit Acceptance
This circuit has been tested and documented in accordance with the above itemized data. This circuit by:
Contractor_____________________________________________________________
The Heat Trace Installation Record can be used to monitor the initial installation and check out process. This form can be used in
conjunction with the Periodic Inspection Record shown in Figure 20.
®
© BriskHeat
Self Regulating Heating Cable
Date _____________________________________________
DESIGN ACTUAL
_______________________ _______________________
_______________________ _______________________
Date _____________________________________________
O.K. ___________________ Damage ________________
O.K. ___________________ Open ___________________
Megohms _________________________________________
No. ______________________________________________
Date _____________________________________________
O.K. ___________________ Open ___________________
Megohms _________________________________________
Visual Check O.K. __________________________________
Date _____________________________________________
Approved _________________________________________
Megohms _________________________________________
DESIGN ACTUAL
_______________________ _______________________
_______________________ _______________________
_______________________ _______________________
_______________________ _______________________
_______________________ _______________________
_______________________ _______________________
Date_____________________
Figure 21
Corporation. All rights reserved.
30