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AirComm Corporation Bell 429 Heating System 429H201M1 Rev3 User Manual
AirComm Corporation Bell 429 Heating System 429H201M1 Rev3 User Manual
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HEATER SERVICE MANUAL 429H-201M-1
Revision 2 Page 7-1
CHAPTER 7
TROUBLESHOOTING
1. SYSTEM TROUBLESHOOTING
Prior to troubleshooting a defective system, it is advisable to conduct a visual inspection for
general condition, and obvious signs of damage or failure.
The following matrix lists the easiest checks, and the most likely problems.
Problem Probable Cause Solution
No Heat
Bleed air shutoff valve not
open Operate heater switch to ON
position
No Heat
Heater System Control Valve
in the off position Operate the heater system control
valve to the ON position
No Heat
Shutoff valve failure Replace shutoff valve
No Heat
HTR Circuit breaker tripped Reset breaker
No Heat. Heater OVER TEMP
light illuminated
Malfunction of Temp Sensor
Switch Check switches – all switches
should be electrically open (See
figures 3.10 and 3.12)
No Heat. Heater OVER TEMP
light illuminated
Air blockage of heater inlet or
outlets Remove blockage
No Heat. Heater OVER TEMP
light illuminated
Bleed air line fitting loose
causing an over temperature
condition Check all lines and fittings for
security
HEATER DUCT HOT light
illuminated. Thermal Snap Switch too
close to duct assembly Inspect snap switches to ensure a
minimum 0.8 inch clearance
between the snap switch and the
duct.
HEATER SERVICE MANUAL 429H-201M-1
Revision 1 Page A-1
APPENDIX A
Weight and Balance Information
Weight breakdown – Bell 429 Provisions:
Item Drawing Number Wt.
(lbs) X-Arm
(in) Y-Arm
(in) X-M
(in-lb) Y-M
(in-lb)
Misc Heater Provisions Instl 429H-514-1 2.29 163.4 -1.4 373 -3
Plumbing Provisions, Cabin
Roof to Control Valve Instl 429H-534-1 7.23 157.5 -19.0 1139 -137
Plumbing Provisions, Control
Valve to Ejectors Instl (Tubes) 429H-544-1 5.84 154.0 0.4 899 2
Plumbing Provisions, Control
Valve to Ejectors Instl
(Fittings) 429H-544-1 1.17 151.6 0.2 177 0
Electrical Provisions Instl 429H-814-1 0.11 222.0 11.0 23 1
Total (English Units) 429H-201 16.63 157.1 -8.8 2612 -137
Total (Metric Units) 429H-201 7.54 3989.7 -223.9 30095 -1577
* Negative value indicates left of center
Weight breakdown – Bell 429 Components