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Hurricane furnace plumbing diagram 2000 Magna

Yahoo Message Number: 69590
I've posted on another forum but got no help. I've been studying the plumbing drawings for my Hurricane Furnace and found a symbol that I cannot identify.
I've posted a photo of a section of the drawing under Pete's 2000 Magna Hurricane Drawing in the photo area. The part I'm interested in is the one labeled 8H near the center of the drawing. This is on the return line coming from the engine which is identified as item 9. I wondered if this is a hand valve that I might use to shut off the block heating portion of the furnace while I'm am parked for the winter season and not planning on driving the coach. I've searched for a valve but can't locate one.

Thanks for any help.
Pete

2000 40' Magna 5892
Pete
 2000 40'  Magna #5892  CAT C-10

Re: Hurricane furnace plumbing diagram 2000 Magna

Reply #1 –
Yahoo Message Number: 69612
Jim,

On my coach, the Hurricane and engine coolant loop are two separate circuits. The engine coolant may become warm due to heat transfer through the coolant, but the engine coolant is not being circulated. As far as I know, there is no valve. This would cause problems if you ran the engine coolant pump and forgot to open the valve. I'm sure the pump would be damaged.
This setup should work for you since the system will not run unless the plumbing or coach heat thermostat calls for it. Yes, the engine coolant temp may rise above 100 degrees, but only when the other zones are calling for heat. The Hurricane is so efficient that I would not be concerned about some potential heat loss through the engine coolant.

Rob

2002 Intrigue #11480