The electrical circuit in the heat pump is dependent on the controller and sequence that is
being utilized. The unit can be supplied with a 208V, 277V or 460V power supply. The unit
is equipped with an unfused service disconnect. A copy of the electrical schematic can be
found folded in a pouch inside of each geothermal/water source, located on the electrical
enclosure or supply air fan housing.
All the included damper assemblies have airfoil section extruded aluminum blades with
flexible seal blade tips and jamb seals. The damper actuator manufacturer can vary.
Please refer to the wiring schematic for the damper actuator model type and control.
100% economizer is an option feature on the water source heat pumps. This module
includes a modulating spring return damper actuator and aluminum damper assembly and
associated controls.
Internal powered exhaust is an optional feature that may be provided with the VHW series.
This feature comes with a spring return actuated aluminum damper, direct drive fan and
ECM motor. It shall operate in tandem with the outdoor air damper to be able to provide up
to 100 % power exhaust
Typically 1” disposable filters are provided in the unit. Please refer to the “shop drawings”
for specific details on filter construction and thickness for your unit. Below are the sizes
and quantity for the typical base unit and additional filters for optional modules.
Model Number
Filter Size
Quantity per Unit
VHW 36/48/60
18
” x 25” nominal
2
Energy Recovery Module
12
” x 20” nominal
2
-7-
Electrical Circuit
Dampers
100% Powered Exhaust (optional)
Filtration
100% Economizer (optional)
