WSHP-PRC004-EN
12
Features and
Benefits
Adjustable
Temperature
Setting
(Factory set
to 55 F
[12.8 C])
Power
Connection
Water
Sensor
Figure FB-21 – Boilerless Controller
Boilerless Control and Electric Heat
(option)
The boilerless electric heat option is
composed of a nichrome open wire
heating element with an internal
temperature limit placed above the fan
housing and an electronic (boilerless)
controller located in the main control
box.
See Figure FB-21 for boilerless
controller.
The boilerless control option is
comprised of a single stage of electric
heat and is designed to invoice electric
heat in the event that entering-water
temperatures falls below 55 F [12.8 C].
On a call for heating, the electric heater is
energized, locking out the compressor.
Once the entering water temperature
rises, above 60 F [15.6 C], the boilerless
controller returns the unit to normal
compressor heating operation and locks
out the electric heater. This option is
ONLY available on heat pump units.
See
Figure FB-22 for boilerless control
electric heat schematic.
Table FB-3 – Heating Elements
Unit Size
Voltage
No. of Elements
kW
Heat Total Amps
Digit 22
006-015
220-240
2
3.00
10.83
2 (Minimum)
4.00
14.44
3 (Maximum)
Figure FB-22 – Boilerless Control Electric Heat Schematic
Cooling Only Units with Electric Heat
(option)
Electric heat on a cooling only system
incorporates the same nichrome open
wire coil design as mentioned in the heat
pump version. Although, for units that
utilize a cooling ONLY-electric heat
design, the thermostat is wired directly
to the primary electric heat contactor for
heating, and the compressor contactor
for cooling. See Figure FB-23 for cooling
only with electric heat diagram and
Table FB-3 for heating element size and
quantity.
Figure FB-23 – Cooling Only With Electric Heat Schematic
