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* ref - reference
* STBY - standby
* vlv - valve
AIR CONDITIONING - TEMPERATURE CONTROL - INTRODUCTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 44
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-801
AIR CONDITIONING - TEMPERATURE CONTROL - INTRODUCTION
AIR CONDITIONING - TEMPERATURE CONTROL - INTRODUCTION
EFFECTIVITY
GUN 001-099 21-60-00
Page 45
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-801
AIR CONDITIONING - TEMPERATURE CONTROL - INTRODUCTION
AIR CONDITIONING - TEMPERATURE CONTROL - INTRODUCTION
EFFECTIVITY
GUN 201-999 21-60-00
Page 46
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-801
General Description
The temperature control system can operate when the air
conditioning packs operate. The packs operate when there is a
bleed source from the pneumatic system.
The air conditioning accessory units (ACAU) monitor the
operation logic for the pneumatic and air conditioning
systems. It enables the temperature control system when the
air systems are serviceable.
The pack/zone temperature controllers receive control signals
from the temperature control panel. Temperature sensors send
temperature data from the flight and passenger compartments.
The pack/zone temperature controllers send control and
operation signals through the ACAU for temperature control.
The temperature control system has overheat switches in the
supply ducts. The overheat switches give indication and stop
operation when the temperature is out of limits.
Temperature bulbs in the passenger cabin and duct monitor
and send temperature data to the cabin temperature control
panel. The temperature control panel shows air temperatures.
Temperature Control Panel
The temperature control panel is the flight crew interface for
system control and indication.
The flight crew selects the temperature setpoints for the three
airplane zones with the temperature selectors.
Pack/Zone Temperature Controllers
There are two pack/zone temperature controllers. They monitor
system parameters and control the air conditioning
temperatures for the three air conditioning zones.
The pack/zone temperature controllers are part of a redundant,
fault tolerant control system. The system reconfigures to give
optimum performance when there are faults.
The controllers process inputs from these things:
* Zone temperature selectors
* Zone cabin temperature sensors
* Zone duct temperature sensors
* Pack temperature sensors
* Mix manifold sensors.
The controllers modulate these valves in response to
temperature control requirements:
* Pack temperature control valves (normal and standby)
* Zone trim air modulating valves.
Pack Temperature Control Valves (Normal and Standby)
The temperature control valves control the discharge
temperature of the air conditioning packs.
AIR CONDITIONING - TEMPERATURE CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 47
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-803
The temperature control valve is the normal valve for control of
pack output temperature
The standby temperature control valve does these functions:
* Controls pack output temperature if the normal system
components fail
* Operates to prevent icing in the condenser.
Trim Air Pressure Regulating and Shutoff Valve
The trim air pressure regulating and shutoff valve does these
functions:
* Controls airflow to the zone trim air modulating and shutoff
valves
* Controls the pressure of the airflow to the zone trim air
modulating valves.
Zone Trim Air Modulating Valves
The zone trim air modulating valves control the trim air flow to
the three air conditioning zones. Hot trim air goes to the zones
that have hotter demands.
Zone Trim Air Mufflers
The forward zone trim air muffler reduces the amount of air
distribution noise that is sent to the forward air conditioning
zone. The aft zone trim air muffler reduces the amount of air
distribution noise that is sent to the aft air conditioning zones.
Duct Overheat Switch
The duct overheat switch provides overheat protection of the
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