System information

ClimateMaster Geothermal Heat Pump Systems
29
Residential Products Technical Guide
• Once the equipment is selected for sensible cooling and the
proper size for heating has been determined, the latent cooling
requirements should be considered. In the product catalog
data, TC (Total Cooling capacity) and SC (Sensible Cooling
capacity) are shown. Latent capacity equals TC minus SC. The
heat gain calculation should also show TC and SC, which can
be compared to the product catalog data. In most residential
applications, properly selected equipment for heating and
cooling will provide adequate latent capacity to maintain 50%
to 55% RH (Relative Humidity). However, especially in humid
climates, the latent capacity may not be suffi cient to satisfy
the latent load (this is true of any residential air conditioning
system). In those cases, equipment selection should include
two-stage operation, ECM fan and in some cases additional
dehumidifi cation equipment. Two-stage operation increases
equipment run time, thereby increasing the amount of
moisture removal over time. The ECM fan option provides
a dehumidifi cation mode that operates the fan at about 25%
less than the normal airfl ow in the cooling mode (the heating
mode is unaffected). Finally, ClimaDry
®
II Whole House
Dehumidifi cation can be applied to further assist in removing
moisture in extreme climates.
Figure 19: Geo A Bin Report From
GeoDesigner Software
ASHRAE Summer and Winter Comfort Zones (I.P. Units)
Acceptable ranges of operative temperature and humidity for people in typical
summer and winter clothing during primarily sedentary activity.
Equipment Sizing