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WSHP-PRC001-EN 11
Boilerless Control/Electric Heat
Heating/Cooling Mode
In heating mode, when the water tem-
perature falls below 55 F (factory set-
ting), the electric heater
is energized, locking
out the compressor.
The systems electric
heat source will continue to be
utilized for primary
heating until
the loop
tempera-
ture rises
above 60 F.
Once the
entering water tempera-
ture rises above 60 F, the boiler-
less controller returns the unit to
normal compressor heating opera-
tion and locks out the electric heater.
This maximizes efficiency from the
unit during the few days requiring
heat from the mechanical system. See
Figure 18 for the factory mounted and
wired boilerless control electric heat
water-source heat pump. Available as
a single point power connection.
If the unit employs a cooling only unit
design, the electric heat contactor is
wired directly to the thermostat for
primary heating, and the compressor
contactor for cooling.
Note: For geothermal applications,
the boilerless controller has an adjust-
able setting of 25, 35, 45, 55 and 60
degrees.
Features and
Benefits
Figure 18: Boilerless control, electric heat water-source heat pump