Specifications
15
Electrical Control System
Voltage 12.5 Vdc
Battery One, group C31, 12 volt battery
Circuit Breaker CB1—Zone 2 Fan Motors 30 amp, auto reset
Circuit Breaker CB2—Zone 3 Fan Motors 30 amp, auto reset
Fuse Link Rating 110 amps @ 72 F (22 C)
Fuse F2—Electric Contactors 5 amp
Fuse F3—Zone 1 Damper 15 amp
Fuse F4—High Speed (Throttle) Solenoid 15 amp
Fuse F6—Zone 1 (Host) Solenoids 15 amp
Fuse F12—Zone 3 Fan Motors 25 amp
Fuse F13—Zone 3 Solenoids 15 amp
Fuse F15—Zone 2 Fan Motors 25 amp
Fuse F16—Zone 2 Solenoids 15 amp
Fuse F20—Control Circuit Power 40 amp
Fuse F22—Host Unit Controls 25 amp
Fuse F23—Starter Circuit 40 amp
Other Fuses 2 or 5 amp
Battery Charging: Model 30 12 volt, 120 amp, brush type alternator
Model 50 12 volt, 105 amp, brush type alternator
Voltage Regulator Setting 13.8 to 14.3 volts @ 77 F (25 C)
NOTE: Fuse F7 (Bypass resistor for Prestolite Alternator) must be removed for the Bosch Alternator.
The Bosch alternator has the word “BOSCH” on the end opposite the pulley (see Figure 17 on page 43).
Electrical Components
NOTE: Disconnect components from unit circuit to check resistance.
Current Draw (Amps)
at 12.5 Vdc
Resistance—Cold
(Ohms)
Fuel Solenoid: Pull-in Coil 35 to 45 0.2 to 0.3
Hold-in Coil 0.5 24 to 29
Damper Solenoid 5.7 2.2
High Speed (Throttle) Solenoid 2.9 4.3
Condenser Inlet Solenoid 1.3 9.6
Liquid Line Solenoid in Host Unit 1.5 8.3
Liquid Line Solenoids in Remote Units 1.3 9.6
Hot Gas Solenoids 1.5 8.3
Suction Line Solenoids 1.3 9.6
Receiver Tank Pressure Solenoid 0.7 17.0
Purge Valve 0.7 17.0
Air Heater 70.0-89.0 0.14
Starter Motor—Gear Reduction Type 250-375*
*On-the-engine cranking check. Bench test is approximately 100 amps on the direct drive starter and approximately 80 amps
on the gear reduction starter.
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