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Topic: Water cutoff to front Heater (Read 379 times) previous topic - next topic

Water cutoff to front Heater

In the water compartment, is a valve to the front heater.  It tag that states close valve for more heat.  Will opening the valve stop hot water from going to the dash heater core, which should make the front A/C perform better.  Am I correct on this.

Thanks
Jimmy Freytag,  Ardmore, Ok
1999 36ft U320. — -SOLD—-
1988 40ft GV        1990 36ft U280
1993 40ft U280      1996 36ft U280
  TRAVEL WHILE YOU CAN THE TIME WILL COME
            WHEN YOU NO LONGER CAN.

Re: Water cutoff to front Heater

Reply #1 –
Jimmy,

No.  Closing the valve just diverts all engine-heated water from water heater to the dash heater.

Opening it allows water to both.

You can put an in-line ball valve to fully shut off engine-heated water from reaching the dash heater if the original heater valve is not completely shutting off.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Water cutoff to front Heater

Reply #2 –
Quote from: Jimmy Freytag –
In the water compartment, is a valve to the front heater.  It tag that states close valve for more heat.  Will opening the valve stop hot water from going to the dash heater core, which should make the front A/C perform better.  Am I correct on this.
Jimmy,
IIRC, the '96 U280 has a temperature control on the dash that goes from blue (cool) to red (heat).  When the dash control is in the "full cool" stop, the local dash heater core control valve is fully closed and no hot water supply is being provided to the dash heat exchange radiator. 
Conversely, when the valve in the water bay is closed, it stops the engine recirc water from flowing through the propane hot water tank (less heat loss to the water heater) and sends the engine hot recirc water only to the dash (more heat to the dash).  When the valve in the water bay is opened, as you suggest,  engine hot water recirc is allowed to go to the dash and the hot water heater (but will not flow if the dash control valve is in the "full cool" position, because the local control valve is closed, as explained above).
Neal
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Neal (& Brenda) Pillsbury
'02 U320 SPEC, 4200, DGFE, Build #5984
'04 Gold Wing
'07 Featherlite 24'
'14 Jeep Grand Cherokee Summit
MC #14494
Exeter, NH & LaBelle FL
Quality makes the Heart Soar long after Price is Forgotten

Re: Water cutoff to front Heater

Reply #3 –
We do have ball valves on the engine end of both of the dash heater hoses. We put them in when our heater core leaked, so we could wait to get it repaired. We have used them for very hot weather, but not very often.
 

Re: Water cutoff to front Heater

Reply #4 –
Neal, thanks for the reply and the explanation
Jimmy Freytag,  Ardmore, Ok
1999 36ft U320. — -SOLD—-
1988 40ft GV        1990 36ft U280
1993 40ft U280      1996 36ft U280
  TRAVEL WHILE YOU CAN THE TIME WILL COME
            WHEN YOU NO LONGER CAN.