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Carrier Indoor & Outdoor Split Geothermal Heat Pumps - Rev.: 08/10/05
48
Air Handler Selection Example
Figure 1 shows a typical peformance table for a heat
pump air handler. Suppose the evaporator temperature
required is 50ºF, the capacity required is 35,000 Btuh
and the airfl ow required is 1,200 CFM. Each evaporator
temperature listed in the table shows three wet bulb
temperatures. As recommended in the table notes
above, select the 67ºF WB column. At 1,200 CFM, the
model 003 capacity is 36 MBtuh, which is higher than
the minimum capacity required of 35,000 Btuh. In this
example, model 003 would be the appropriate match.
Figure 1: Selecting Air Handler
Utilizing the Existing Air Handler or Coil (R22 units only)
It is recommended that a new coil or air handler be
installed with any geothermal split system compressor
section due to the low initial cost of the additional
equipment versus the reliability and benefi t of new
technology, increased reliability and warranty. However, if
the existing air handler must be used (R22 systems only),
the following conditions apply:
• If the existing coil currently uses an orifi ce, the orifi ce
must be removed and replaced with a TXV. If the coil
utilizes capillary tubes, it will not operate properly with
the geothermal split system and should be replaced.
• If life expectancy of indoor coil (and associated
components - fan, cabinet, etc.) is less than 7-10 years,
indoor section should be replaced.
Equipment Selection
Selecting Air Handler