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Lochinvar Cascade Operation With Smaller Leader
I’d like to use a WHN55 as the leader and WHN199 as a
follower. The 199 would also heat an
indirect tank. Can any of you provide
some practical comments on this type of setup?
The service manual doesn’t say you can and doesn’t say you can’t have a
smaller leader. It does mention that
when the leader and follower are different sizes an “efficiency mode” is
automatically selected. Some questions:
-Could I select lead/lag in this configuration or is it
locked out? The lead/lag description in
the service manual seems better than the efficiency mode
-I’m concerned the transition from the WHN55 to the WHN199
might not be smooth. The description of
lead/lag addresses this, but the efficiency mode does not. I’m assuming that Lochinvar has taken into
account since “efficiency mode” is set when different boiler sizes are
connected. Whats get me is the sentence that
“both boilers modulate together” in the service manual. Can anyone clear this up for me?
-I’m assuming when both units are firing and there is a DHW
call, the non-DHW boiler will ramp up to 100% if needed. Is this a good assumption?
Any tips, tricks, experiences are appreciated.