Figure 18: Standard SS HP - Standard ECM AHU
Figure 19: Standard SS HP - Standard ECM Gas Furnace
Dehumidification control (typical)
The indoor unit Installation Manual for the air handler
or furnace describes 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. Before 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 operates at a
lower speed until the dehumidification control is satisfied.
Aim for a 40-60% relative humidity level 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
indoor airflow settings of each specific heat pump. For the
system to operate correctly, ensure that the indoor CFM
selection is correct.
Installation Manual: R-410A Outdoor Split-System Heat Pump - YH2F, THF2, RHP150 Series 35
Johnson Controls Ducted Systems
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