21-44-09
 ú ú 09 Page 404 ú Jun 20/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
 SUPPLEMENTAL HEATING SYSTEM - DESCRIPTION AND OPERATION
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General
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 A.  The supplemental heating system consists of four foot electric surface heaters and two shoulder air supply heaters that are located in the flight deck.
Component Details (Fig. 1)
_________________
 A.  Foot Electric Surface Heaters_____________________________
 (1)  
Physical Description

 (a)  
Electric foot warmers are installed in the airplane cockpit, for the convenience of the pilot and co-pilot.

 (b)  
The foot heater may be operated at 115 or 200 Vac. The surface temperature is thermostatically controlled at 60° |10°F.

 (c)  
Another thermostat is used as a safety factor to control the over temperature cut-off at 150°F. maximum.

 (2)  
Operation

 (a)  
The foot warmer is energized by 115/200 Vac, 400 Hz input voltage applied between pins 1 and 2 of connector (J1). Thermostat TC1 controls the temperature of heater HR1 at 60°F. The TC2 is a safety device to control the over temperature cut-off at 150°F. maximum.

 B.  Shoulder Air Supply Heater__________________________
 (1)  A shoulder air supply heater supplies heated air to the captain's shoulder area. An identical heater is provided for the first officer. Each heater mounts in the sidewall conditioned air distribution duct immediately below the flight deck floor. The shoulder air supply heater is a dual range electrical element heater. The heater operates on low range using 115 Vac or on high using 200 Vac. An integral heating control thermostat monitors heater coil temperature and opens at 150°F interrupting current flow to the coil. A backup safety thermostat opens at 250°F.
Operation (Fig. 2)
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 A.  Individual heaters provide heated air to captain's and first officer's shoulder areas and surface heat to the foot area. Switches on the captain's fwd aux panel (P13) provide individual control for the captain's foot and shoulder heaters. Similar switches on the first officer's fwd aux panel (P14) provide control for the first officer's heaters. Each switch is a three positon toggle switch with OFF, LOW and HI control positions. Each air supply heater operates in a similar manner.
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 ALL  ú ú 01 Page 1 ú Sep 15/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

SEEB
SEE B SEE A
SHOULDER AIR SUPPLY HEATER
FWD SHOULDER AIR SUPPLY HEATER B
FOOT HEATER
FWD
FOOT ELECTRIC SURFACE HEATER A Supplemental Heating Components Figure 1
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 ALL  ú ú 01 Page 2 ú Sep 15/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

P70  HEATER L
CAPT SUPPLEMENTAL HEATING SYSTEM
(F/O SUPPLEMENTAL HEATING SYSTEM SIMILIAR)

Supplemental Heating System Schematic
Figure 2

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 ALL  ú ú 01 Page 3 ú Dec 15/85
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F09152
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757 MAINTENANCE MANUAL
 SUPPLEMENTAL HEATING SYSTEM - ADJUSTMENT/TEST
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 1.  General
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 A.  This procedure contains one task. The task is a system test of the supplemental heating system.
 TASK 21-45-00-735-001
 2.  System Test - Supplemental Heating System
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