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Subject: TWL: FW: Hydronic Heating
From: Ed Bottrell (Bottrell@XXX.XXX)
Date: Wed Dec 18 2002 - 15:42:04 EST
Andy,
I believe your description of our hydronic system is correct... one system,
shared coolant with furnace, engine and H/W heater. Admittedly, there are
more opportunities for leaks - about 18 clamped connections counting the two
gate valves that can isolate the diesel furnace system. I don't know if
these valves also isolate the H/W heater because I have not traced all the
hoses (3/4" ID). BTW, I'm planning to replace all of the coolant with CAT's
version of permanent antifreeze next spring.
The three mitigating offsets for the increased chance of leaks are: 1) ER
check before every run includes fluid level check of coolant system; 2)
separate engine temperature (1) and exhaust temperature alarms (2); and, 3)
when diesel furnace is running, low fluid level will trigger overtemp
shutdown.
We do not have a separate expansion tank for the coolant system but I can
bleed the system with a butterfly valve just past the output of the furnace
and relieve pressure by opening the engine coolant expansion tank when the
engine is not running.
Furnace exhaust temperature is too hot to touch and needs shielding vs.
ESPAR where you can leave your hand on the exhaust pipe after a few feet
from the furnace.
CO monitor, I'm told, should be at the same level as your head when
sleeping.
Regards,
Ed
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