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2.13 SAFETY DEVICES
The system is protected from high pressure conditions which may occur when exposed to very high temperatures
(such as a fire) by a fusible plug mounted in the receiver. Under very high temperature conditions (refer to Section
2.10) the plug will melt, releasing the refrigerant pressure.
System components are protected from damage caused by unsafe operating conditions by automatic shut-down of
the unit when such conditions occur. This is accomplished by the safety devices listed in the following table.
Unsafe Conditions
Safety Device
Device Setting
Excessive operating pressure
High Pressure Switch
(HPS)
Refer to Section 2.10
Excessive current draw by microprocessor
Fuse (F1)
Opens at 7.5 amps
Excessive current draw by speed relay
Fuse (F2)
Opens at 10 amps
Excessive current draw by run relay
Fuse (F3)
Opens at 7.5 amps
Excessive current draw by battery output
Fuse (F5)
Opens at 80 amps
Excessive current draw by control circuit
Fuse (F6)
Opens at 15 amps
Excessive current draw by battery charger in-
put - 20 amp charger.
Fuse (F7, F8)
Opens at 3 amps (single charger)
OR
opens at 6amps (dual chargers)
See note.
Excessive current draw by battery charger in-
put - 40 amp charger(s).
Fuse (F7, F8, F29)
Opens at 5 amps (timed)
Excessive current draw by generator/power
supply contactors
Fuse (F9)
Opens at 10 amps
Excessive current draw by evaporator heaters Fuse (F10/F11/12)
Opens at 12 amps
Excessive current draw by fuel heater circuit
Fuse (F19)
Opens at 20 amps
Excessive current draw by fuel level sensor
circuit
Fuse (FLS)
Opens at 3 amps
Excessive current draw by evaporator or con-
denser fan motor
Fuse (F26/F27/F28)
Opens at 12 amps
Excessive condenser fan motor winding
temperature
Internal protector
Auto reset
Excessive compressor motor winding
temperature
Internal protector
Auto reset
Excessive evaporator motor winding
temperature
Internal protector
Auto reset
NOTE: When a second 20 amp rated charger is used to charge a lift gate battery, the higher rated fuse is installed