The figure illustrates a typical flow path for a separate cabin heating loop.  While it is possible to simply route engine coolant to space heater registers located in the cabin, use of a separate exchanger as illustrated here provides more flexibility in regulating hot water flow to space heat registers, and avoids loss of engine coolant should leaks develop in the space heating circulation loop.  A cabin heater may also be installed on a fresh water cooled engine.

Hot engine coolant in the thermostat bypass circuit is routed through the space heating exchanger, then returned to the engine circulation pump suction.  Space heat circulating fluid is pumped from a fill reservoir through the heat exchanger, and then through the space heating register(s).

Phone: 360-734-6860    Fax: 360-676-5957   e mail: admin@orcamarine.com  
Last modified: June 3, 2008.  Copyright © 2003, 2004, 2005, 2006, 2007, 2008 Trunek Enterprises, Inc.  All rights reserved.