Sanden compressor clutch and other things
Posted by HH56 On 2013/10/18 16:55:40
As some may remember, we have been discussing the Sanden clutch operating at 6v adnauseum.
Some have said the clutch will work on 6v. This may be true but I have yet to confirm it directly. Dwight H. says his 54 runs one with no issues. Another who is supposed to be running one on 6v in a prewar Clipper did not respond to my email asking for info. Others have been reported as running them but no confirmations as to who they are or if any issues.
Have been playing around and testing possibilities for my 47 AC. I can confirm clutch will not pull in at 6.3v but will at a slightly higher voltage. My thinking -- until proven otherwise -- is that those cars running them on 6v are relying on the higher generator charging voltage to do the work.
After a fair amount of testing, I am becoming comfortable at running the blower on 6v. Worst case, with the proper evaporator configuration that 12v motor could be changed out. The clutch has still been a maybe. For want of something better, I made a module to switch a small extra battery in series with the regular battery to provide a proper 12v for operation of the clutch. Have been doing testing for several days on the bench and it seems to be functioning as planned. The circuit keeps the extra battery in parallel when not needed so it stays charging. When the thermostat calls for clutch operation, a relay changes to series output and supplies the clutch only with 12v. When thermostat cycles clutch off, battery reverts to parallel again.
A second relay was added to disconnect the circuit when engine was starting so excess current is not pulled from the small battery. The resistor is to keep the charging current to the small battery fairly low. Not shown on the schematic is a control relay. If the AC power is taken from that point directly off the main battery, a relay or some means of controlling AC with ign switch would be needed.
Testing mode used the regular car battery as one battery with a charger substituting for the generator circuit. The extra battery is a small 12ah unit. Since the clutch only draws about 2.75 amps at 12v, the small battery would keep it operating for 2 or 3 hours. With the AC cycle down time going back to a charge configuration, am hoping it will work as envisioned for a considerable period of time.
Only downside I see at the moment is the absent minded mechanic hooking the regular battery up backwards. Hopefully putting the large fuse where it is will prevent too much excitement. The small fuse is just to protect the clutch and wiring.
Anyway, for anyone interested here is the circuit. It will be some time before my car is ready for a real test. I will be installing it eventually but if anyone wants to shoot the theory full of holes or even give it a try, be my guest. Any questions or anything not clear as mud, feel free.
Module will be in an enclosure and battery is in a separate package. Both are reasonably small so can be mounted out of sight and/or separated. I wanted flexibility so went a little fancy with sockets and terminal strips but all could be done wire to wire.
Attach file:
(43.97 KB)
(126.51 KB)
Some have said the clutch will work on 6v. This may be true but I have yet to confirm it directly. Dwight H. says his 54 runs one with no issues. Another who is supposed to be running one on 6v in a prewar Clipper did not respond to my email asking for info. Others have been reported as running them but no confirmations as to who they are or if any issues.
Have been playing around and testing possibilities for my 47 AC. I can confirm clutch will not pull in at 6.3v but will at a slightly higher voltage. My thinking -- until proven otherwise -- is that those cars running them on 6v are relying on the higher generator charging voltage to do the work.
After a fair amount of testing, I am becoming comfortable at running the blower on 6v. Worst case, with the proper evaporator configuration that 12v motor could be changed out. The clutch has still been a maybe. For want of something better, I made a module to switch a small extra battery in series with the regular battery to provide a proper 12v for operation of the clutch. Have been doing testing for several days on the bench and it seems to be functioning as planned. The circuit keeps the extra battery in parallel when not needed so it stays charging. When the thermostat calls for clutch operation, a relay changes to series output and supplies the clutch only with 12v. When thermostat cycles clutch off, battery reverts to parallel again.
A second relay was added to disconnect the circuit when engine was starting so excess current is not pulled from the small battery. The resistor is to keep the charging current to the small battery fairly low. Not shown on the schematic is a control relay. If the AC power is taken from that point directly off the main battery, a relay or some means of controlling AC with ign switch would be needed.
Testing mode used the regular car battery as one battery with a charger substituting for the generator circuit. The extra battery is a small 12ah unit. Since the clutch only draws about 2.75 amps at 12v, the small battery would keep it operating for 2 or 3 hours. With the AC cycle down time going back to a charge configuration, am hoping it will work as envisioned for a considerable period of time.
Only downside I see at the moment is the absent minded mechanic hooking the regular battery up backwards. Hopefully putting the large fuse where it is will prevent too much excitement. The small fuse is just to protect the clutch and wiring.
Anyway, for anyone interested here is the circuit. It will be some time before my car is ready for a real test. I will be installing it eventually but if anyone wants to shoot the theory full of holes or even give it a try, be my guest. Any questions or anything not clear as mud, feel free.
Module will be in an enclosure and battery is in a separate package. Both are reasonably small so can be mounted out of sight and/or separated. I wanted flexibility so went a little fancy with sockets and terminal strips but all could be done wire to wire.
Attach file:
(43.97 KB)
(126.51 KB)
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