Indirect DHW tank always on with zone valve installation?

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Old 01-21-15, 11:59 AM
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Indirect DHW tank always on with zone valve installation?

I was looking thru installation instructions for superstore contender indirect water heater and I came across this diagram for installation with zone valves:

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I don't see a zone valve on the DHW zone so it seems that hot water will flow thru the tank when DHW calls for heat or when any other heating zones call for heat.

if DHW has priority the other zones will be shut off, but it seems that DHW will always be on with or without a call for it.

is this typical installation? i wonder if it's a mistake since there is another oddity on the diagram - there are 3 outgoing pipes for 3 zones and there are 4 intake pipes. I wonder if one of those intakes with a zone valve supposed to be to the DHW tank.
 
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Old 01-21-15, 02:40 PM
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I don't grok that diagram at all. Looks like a mistake to me too...

Whoever drew that probably went on coffee break and then forgot where he left off cutting and pasting from the other diagram.

What's with the pump?

If using zone valves, definitely go with the 1" that the diagram calls for.

If using pumps, you need flow check valves so the heating zones can't pump through the WH, and vice versa.
 
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Old 01-21-15, 02:43 PM
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Figure 5 in this one is better, but the pump location is still whack:

http://www.htproducts.com/literature/lp-65.pdf

I wonder how these ever get installed correctly?

(not that installers ever read the instructions... maybe this time it's a good thing?)
 
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Old 01-21-15, 02:50 PM
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The drawings are piss poor... I would ignore them..

Figure 6 -
Installation with Circulators is a little better... just pretend your using zones on the system side .

A call to their engineers is in order IMO...

http://www.htproducts.com/literature/lp-65.pdf
 

Last edited by lawrosa; 01-21-15 at 02:52 PM. Reason: Sry... posted same time as Trooper...
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Old 01-22-15, 05:36 AM
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ok, thank you guys. i thought i was going crazy

and it looks indeed that 4th line was supposed to be the line going to indirect. and the pump is in the wrong place too
 
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