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10-15 TON HYDRONIC HEAT PUMP INSTALLATION GUIDE
Flow Rate
Load Flow Rate
The load flow on all water to water products including
the Two-Stage Hydronic Series should be 3 gpm per ton
(typically the rated flow and the highest flow shown in the
capacity charts). Refer to the table below. This flow rate is
required especially when heating water to limit the effects
of the higher condensing temperatures of water heating for
radiant floor heating or domestic water use.
Minimum
Open
Loop
18
120
24
180
Flow Switches
The manufacturer recommends the installation of fl ow
switches on the load and source sides. The fl ow switches will
prevent the unit from stating under no or low fl ow conditions.
The source side fl ow switch will also act as an additional
layer in freeze detection controls. Refer to the units wiring
schematic for fl ow switch wiring.
Source Flow Rate
Open
Closed Loop Range
Loop
(Min - Full Flow)
< 50°F
24
27
36
32
36
48
Source Flow Rate
The source flow can range between 2.25 and 3 gpm per
ton for earth loops. For open loop well water systems the
minimum flow should be 1.5 gpm per ton. In earth loop
systems where entering water temperatures are expected to
be above 95°F, 3 gpm per ton should be used. In well systems
where the water temperature is below 50°F, 2 gpm per ton
should be used to avoid nuisance freeze detection trips.
Load
Flow
Rate
36
48
12
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