Figure 19: Standard SS HP - Standard ECM AHU
Figure 20: Standard SS HP - Standard ECM Gas Furnace
Dehumidification control (typical)
The indoor unit Installation Manual instructions for
the air handler or furnace describe the interface with
the outdoor heat pump. A dehumidification control
accessory SI-2HU16700124 may be used with variable
speed air handlers or furnaces in high humidity areas.
This control works with the variable speed indoor unit to
provide cooling at a reduced air flow, lowering evaporator
temperature and increasing latent capacity. The
humidistat in this control opens the humidistat contacts
as the humidity increases. Installation instructions are
packaged with the accessory. Prior to the installation of
the dehumidification control, the humidistat jumper must
be set to YES on the indoor variable speed air handler or
furnace control board.
During cooling, if the relative humidity in the space is
higher than the desired set point of the dehumidification
control, the variable speed blower motor will operate at
lower speed until the dehumidification control is satisfied.
A 40-60% relative humidity level is recommended to
achieve optimum comfort.
If a dehumidification control is installed, it is
recommended that a minimum air flow of 325 CFM/ton be
supplied at all times.
Indoor cubic feet per minute (CFM)
settings (typical)
Refer to the indoor unit Installation Manual instructions
for the air handler or furnace interface with the outdoor
heat pump. Refer to the outdoor Technical Guide for the
recommended indoor airflow settings of each specific
heat pump. For the system to operate correctly, ensure
that the indoor CFM selection is correct.
R-410A Outdoor Split-System Heat Pump Installation Manual - YH2E / THE2 / RHP143 Series32
Johnson Controls Ducted Systems
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