R 1EFF : 151-199, 201-210, 1 30-71-00Page 17 1 1 May 01/05 1 1 1CES 1
R R The drain lines are installed on supports and tightened with clamps and covered with insulation.
R R R R Ice protection control unit 3DW and related sensor 40DU control the drain line heaters 41DU, and 42DU to the FWD drain mast, keeping the temperature of the drain tube between +6 deg C (+43 deg F) to +10 deg C (+50 deg F).
R D. Each heater has:
R R R R R - a self limiting element, - two power supply conections, - an inner insulation, - a copper shield (ground bonding connection), - an outer protection sheath.
R E. Each sensor has:
R R R R R - a ceramic and epoxit housing, - a sensing chip (contains a thermister), - two connection pins, The value of the thermister depends on the set temperature of the waste water lines.
R
**ON A/C 301-399,
A. The waste water is discarded through the drain lines to the fwd heated drain mast 4DU and the rear heated drain mast 14DU to atmosphere, which are installed on the lower fuselage shell. The waste water is moved to the drain masts through gravity on the ground and differential pressure in flight.
B. Each drain mast assembly has: - an aluminum alloy housing (aerodynamic shape), - a drain tube with integrated electrical heating-elements, - an PTC temperature sensor (measures the ambient temperature), - an overtemperature switch (prevents damage to heating element), - A flange for installation of the drain mast is part of the top of the fairing.
C. Two ice protection control units 5DU and 15DU regulate the 115 V AC 400Hz single phase to the related heater of the drain mast. The drain mast heating element operates from -55 deg C (-65 deg F) to +75 deg C (+160 deg F). The overtemperature switch installed in the drain mast will stop the power supply if the temperature increases above +120 deg C (+250 deg F). The waste water drain lines to the drain masts have heater assemblies
which are installed on the drain lines with bonding tape.
R 1EFF : 201-210, 301-399, 1 30-71-00Page 18 1 1 May 01/05 1 1 1CES 1 The drain lines are installed on supports and tightened with clamps and covered with insulation. Ice protection control unit 140DU and related sensor control the drain line heaters to the drain mast, keeping the temperature of the drain tube between +6 deg C (+43 deg F) to +10 deg C (+50 deg F).
D. The rear galley and rear lavatory waste water drain lines have heater assemblies which are installed on to the drain lines with bonding tape. The drain lines are installed on supports and tightened with clamps and covered with insulation. A seperate control unit and a sensor are used to regulate the heating of the heaters installed on the rear galley and lavatory drain lines to keep the temperature of the drain tube between +10 deg C (+50 deg F) to +15 deg C (+60 deg F).
E. Each heater has:
-a self limiting element,
-two power supply conections,
-an inner insulation,
-a copper shield (ground bonding connection),
-an outer protection sheath.
F. Each sensor has:
-
a ceramic and epoxit housing,
-
a sensing chip (contains a thermister),
-two connection pins, The value of the thermister depends on the set temperature of the waste water lines.
**ON A/C ALL
4. Operation/Control and Indicating
________________________________
R **ON A/C 001-049, 052-099, 101-105, 151-199, 401-499,
(Ref. Fig. 006)
The waste water ice protection system cannot be controlled manually.
The waste water ice protection system operates automatically when the
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