Doug/Karen,
Check out CIRCULATION-LOOP:LOOP-OPERATION = SUBHOUR-DEMAND
For a loop of type WLHP or CW only, this control strategy will cause the
loop pump to cycle subhourly in accordance with the cycling demands of the
attached WLHP/DX units. However, it will not affect the operation of a
boiler/fluid-cooler that may also be attached to the loop; those components
are assumed to run for the entire hour.
Steve Gates
I have further found that the low differential temperatures between supply
and return happens when the loop is in heating mode only. When the loop has
a cooling only load, the temperature differentials are as expected (I can
send a test file directly if anyone is interested).
If the pump is cycling, then this should help maintain a higher difference
in supply and return temperatures.
--
Karen