Thermo King 914970, Manual

Page: 19 / 186

Specifications
17
Air Switch
Air Switch Setting: 0.9 ± 0.05 in. (22.7 mm) H
2
0
Belt Tension
Tension No. on TK Gauge 204-427
New Belt Field Reset
Engine/Compressor 75 ± 3 70 ± 3
Compressor/Jackshaft (Electric Motor) 72 ± 3 67 ± 3
Compressor/Evaporator Fan/Alternator 1/2 in. (13 mm) deflection
Alternator/Evaporator Fan 1/2 in. (13 mm) deflection
Water Pump 1/2 in. (13 mm) deflection
NOTE: These are the original factory settings. Because it is difficult to use the
TK gauge 204-427 in the field, adjust each belt to allow 1/2 inch (13 mm)
deflection at the center of the longest span.
NOTE: Belts should be tensioned cold and again tensioned cold after 10 hours
of unit running.
Electrical Control System
Control System Voltage 12.5 Vdc
Alternator 12 V 23 amp brush type integral alternator
Voltage Regulator Setting 14 V @ 70 F (21.1 C)
Alternator/Regulator LED Capacitor 4.7 µfd 50 Vdc
Alternator/Output Capacitor 0.5 µfd 100 Vdc
NOTE: Disconnect components from unit circuit to check resistance.
Electrical Components
Current Draw (Amps)
at 12.5 Vdc
Resistance—
(Ohms)
Glow Plug 7 to 8.3 1.5 ± 0.15
Fuel Solenoid:
Pull In
Hold In 30 to 40
0.97
0.41 to 0.31
12.8
Pilot Solenoid 0.657 19
Starter Motor 90 to 105 (cranking)
Damper Solenoid 5.68 2.2
DC Circuit Breakers 50 amp
20 amp 10.4
High Speed Solenoid 5 amp (approx.) 2.5 (approx.)