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these circuits:
* Power
* Control
* BITE.
These are the external features of the low limit (35F) controller:
* Rotary six-position selector
* BITE instruction placard
* Mounting flange
* Electrical connector
* NO GO indicator light (Red - press to test)
* GO indicator light (Green - press to test).
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-010
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-010
Purpose
The low limit (35F) valve adjusts the quantity of hot air that goes
into the water separator.
Location
The low limit (35F) valve is in the air conditioning compartment.
It attaches to the duct above the water separator.
There is a low limit (35F) valve for the right and left pack.
Physical Description
The low limit (35F) valve is a 115v ac, single phase, motor
operated, butterfly valve. These are the parts of the valve:
* Position indicator
* Electromechanical actuator
* Valve body
* Valve disk
* Electrical connector.
The valve body has an arrow to show flow direction.
AIR CONDITIONING - COOLING - LOW LIMIT (35F) VALVE
EFFECTIVITY
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-007
AIR CONDITIONING - COOLING - LOW LIMIT (35F) VALVE
AIR CONDITIONING - COOLING - LOW LIMIT (35F) VALVE
EFFECTIVITY
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-007
General
The low limit (35F) components monitor and adjust the
temperature in the water separator to prevent water freezing
conditions.
The low limit (35F) system has these components:
* Temperature sensor
* Controller
* Valve.
Functional Description
The low limit controller selector has six positions. The FLIGHT
position is for normal control. The other positions are for the
BITE test.
The FLIGHT position enables the control and modulation
circuits to operate the valve to maintain an air temperature of
35F (1.7C) within the water separator.
The temperature sensor is a thermistor element within the
probe body. The resistance of the sensor changes in relation to
the air temperature inside the water separator.
The low limit controller uses 115v ac, single phase power for
operation. It detects the temperature sensor resistance as part
of a bridge circuit. The controller balances the bridge circuit by
adjustment of the air temperature in the water separator.
The controller sends an open signal to the valve when the air
temperature is less than 34F (1.1C). It sends a close signal to
the valve if the air temperature is more than 36F (2.2C). The
controller does not send a signal when the air temperature is
34F (1.1C) to 36F (2.2C).
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
Page 54
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-011
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - LOW LIMIT (35F) CONTROLLER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
Page 55
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-011
Purpose
The low limit (35F) BITE does tests of these system components:
* Controller
* Valve
* Temperature sensor.
Operation
The low limit (35F) controller has a six-position rotary selector
with these selections:
* FLIGHT
* Position 1
* Position 2
* Position 3
* Position 4
* Position 5.
A placard on the cover gives test instructions. The green GO
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