Thermo King Service Manual Kd Ii Sr
I have been working on a thermo king KDII MAX for a customer for some time now. Unit has been working great for about 1 year or so. Untill today. He called me and said that it was not operaiting at all and the digital display was totally blank (all controls and switches were turned on). I discovered that the unit was tripping a small circut breaker that is attatched to the lower left control board. This short in the system is very intermittent and only lasts for about 15 seconds or so then 'un-shorts' itself for lack of better terms. I cannot find the short because it happens so fast.
The only thing that seems to be somewhat consistant is that it seems to only happen when the motor is on low speed, possibly when it is cycling between cool and heating. I have checked the coils on the valves to see if they are shorted and when I check them they aren't. I am leaning towards changing the t-stat because is it is the only other thing that changes when cycling between cooling and heating. Any help or maybe a service manual would be awsome. Thanks everyone! Is it the circuit breaker for the engine protection? (low oil pressure, high engine temp) After following every circut (after this breaker) yesturday I never ran across any of the sensors for engine protection like oil pressure ect.
Although the engine protection reset switch is in this circut. Speaking of that, I am not fully understanding that reset switch. It appears to be like a bimetal heater or something, I suppose so if there is a small fluctuation in the oil pressure or temp it has a time delay maybe???? That switch never trips. Does anyone have a service manual for this thing. One that might show resistance values for different items.
Thanks again. 3 things cause that breaker to trip.
Yes it does use heat via ground through either the oil pressure switch or the hi engine temp switch. The other cause is the hi pressure switch. If tripped, it will not allow power to go to run solenoid. Engine quits and oil pressure switch goes to ground and trips breaker.
My money is on the oil pressure switch because it uses a diapham and if it develops a leak in diaphram, when engine goes into low speed, oil pressure drops and trips breaker. Disconnect oil pr. Switch to test. DO NOT RUN TOO LONG IN CASE THERE ACTUALY IS LOW OIL PRESSURE!!! Hope this helps??
3 things cause that breaker to trip. Yes it does use heat via ground through either the oil pressure switch or the hi engine temp switch. The other cause is the hi pressure switch. If tripped, it will not allow power to go to run solenoid. Engine quits and oil pressure switch goes to ground and trips breaker.
I am wanting to clean the internal parts, and see why the shells won’t stay in when you put them in the tube of the gun. Take care, Phil. Sorry I can’t come up with more than that but it’s a place to start. Winchester model 54 values. Ted Rigg said I have a Winchester model 25 12 gauge shotgun. It is suppose to hold 2 shells, and 1 in the chamber.
My money is on the oil pressure switch because it uses a diapham and if it develops a leak in diaphram, when engine goes into low speed, oil pressure drops and trips breaker. Disconnect oil pr. Switch to test. DO NOT RUN TOO LONG IN CASE THERE ACTUALY IS LOW OIL PRESSURE!!!
Hope this helps?? AbbsWhat should the oil pressure be on high and low speed. I was too, that's why I asked the question in post #10.
Are they not the same?No they are not the same. CB2 protects the 2B circuit and remainder subcircuits while the 8D and 20 circuit go to the safety reset switch and open anytime there is ground on the 20 wire via, low oil press switch, low oil level switch, high water temp switch, and high evap temperature switch if applicable. I like you am confused as to what influence the CB2 has with the safety reset switch and vise versa. I am sure someone will come on and explain or offer some clarification. If you are sure it is cb2 tripping you need to be looking at circuits past the on/off switch. Have you had an ammeter in the circuit to check that you do have a short?
The circuit breakers can go soft and trip under normal load. Think cb2 is around 20 amps. One i have seen many times is the damper door shorting on the nimber 29 wire on the defrost solenoid, when the unit goes into defrost the damper closes and shorts on the soleniod terminal and trips the circuit breaker.
Thermo King
Good huntingThe other one I have seen that causes the CB2 to pop is an internally shorted intergral fuel solenoid, or a defective pull-in timer. But based on the symptoms that were supplied I would be inclined to agree with Fox that there is an issue with the defrost damper circuit.
Thermo King Service Manual Kd Ii Sr Parts
Covers: Thermo King KD-II SR Models. KD-II SR 30 (097195). KD-II SR 50 230/3/60 EEC (097199).
Thermo King Service Manual Kd Ii Sr User
KD-II SR 50 230/3/60 (097196). KD-II SR 50 220/3/50 EEC (097200). KD-II SR 50 380-460/3/50-6 (097197). KD-II SR 50 380/3/50 EEC (097201). KD-II SR 30 EEC (097198) Pages: 182 Format: PDF file Compatibility: Windows/Mac/Tablet Note: Instant digital download only – no printed copy or CD-ROM media.