Category: Technical information associated with Raychem Trace
Heating Product Selector Part 2
Email Tyco Thermal Controls - Raychem Trace Heating
Tyco Thermal Controls (UK) Ltd - Raychem Trace Heating
Raychem
Trace Heating Product Selector Part 2
2. Connection System
Consult the selection matrix in order to determine the type and
quantity of components required to form a variety of heating cable
connection configurations.
Note: All Raychem heating cable must be used with the RayClic connection
system, with the exception of FS-C-2X heating cable which may only be
used with the junction box and heat shrink connection system.
3. Heater Length Calculation
Raychem Heating Cables are straight traced.
Length required = Total pipe length
+ 0.3m per power connection
+ 0.5m per splice
+ 1.0m per T-connection
+ 1.2m per four way connection
+ 0.5m per valve/stop cock etc
+ any heater loops
+ additional amounts for heat sinks
+ 5% contingency
4. Electrical Circuit Protection
*Circuit breakers MCB’s to BS EN 60898 Types C or D, or equivalent.
Additionally a residual current device of 30mA sensitivity that trips
within 100mS should be used. Consideration should also be given to power
cable leakage current.
5. Number of Electrical Circuits
Min No of Circuits = Heater length required (step 3)
Max. circuit length for breaker size used (step 4)
6. Electrical Loading
HWAT-M 9.3W/m @ 55oC FS-A-2X 10W/m @ 5oC
FS-B-2X 26W/m @ 5oC
HWAT-R 13.3 W/m @ 60oC FS-C-2X 31W/m @ 5oC
7. Trace Heating Systems
Typical Raychem Hot Water Maintenance System
In a typical Raychem hot water maintenance system the heating cable is
installed as a straight trace along the hot water pipe. It is attached
directly to the pipe with glass cloth tape or, if installing on plastic
pipes, aluminium tape.
The 230V connection takes only a minute to install, using the RayClic
electrical connection, fastened to a bracket. For installations
requiring variable maintained temperatures the special HWAT-ECO control
unit should be used. The HWAT-ECO incorporates a timer and a
time-temperature programme can be stored.
The system can be further controlled using the BMS, facilitating thermal
Legionella prevention or weekend shut-down in addition to variable
temperature maintenance in the range 50ºC to 60ºC.
At a pipework tee a RayClic T connection can be used, attached to a
special bracket. The incoming heating cable powers both outgoing cables.
At the ends of the piping system the heating cable is cut to length and
terminated with the silicone gel-filled end seals, which are included
with every RayClic connection kit.
Typical Raychem Advanced Frost Protection System
A typical Raychem system, as with the system above is installed as a
straight trace along the exposed water services pipework. It is attached
directly to the pipe with glass cloth tape or, if installing on plastic
pipes, aluminium tape.
The heating cables should then be connected and terminated with the
connection systems identified in section 2 at the top of this page.
Control of the freeze protection circuits on temperature sensitive water
services, such as potable and chilled water pipework, should be achieved
by the use of an AT-TS-13 pipe sensing thermostat or Raystat-ECO-10
“Smart” Controller (providing increased energy efficiency) located on
each trace heating circuit. The control of all non-temperature sensitive
water services can be achieved by using a single AT-TS-13 ambient
sensing thermostat, which switches the trace heating system on via a
contactor in the distribution board.
General
Following the installation of the heating cable, the insulation
should be installed to the design recommendations. “Electric Traced”
labels are applied in visible areas at intervals of 5 metres. For
further information please contact us on the number below.
Technical information associated with: Raychem Trace Heating - Tyco
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