46 UV-PRC001-EN
Selection Procedure
Hydronic Coils
Coil Selection
Selecting the correct hydronic coil
is done by using the Trane Official
Product Selection System
TOPSS.
Figure 33: TOPSS Icon.
DX and steam coils are not avail-
able in TOPSS. Refer to pages 78,
79, 81, 82, and 83.
Entering Conditions-Cooling
In cooling applications, the mixture
of wet bulb and dry bulb tempera-
tures are determined by the return
air temperature, outside air tem-
perature and percentage of outside
air. The percentage of outside air is
simply the cfm of outside air re-
quired for ventilation, divided by
the total air delivery of the unit.
Wet Bulb Mixed =
WBr +% OA(WBo - WBr)
Dry Bulb Mixed =
DBr +% OA(DBo - DBr)
WBr = Wet Bulb Return Air
WBo = Wet Bulb Outside Air
DBr = Dry Bulb Return Air
DBo = Dry Bulb Outside Air
% OA = Outside Air Percentage
For convenience, TOPSS has a
mixed air calculator built into the
program.
Hydronic Selections
Hydronic coil selections are deter-
mined from:
• The entering wet and dry bulb
(EWB and EDB) temperatures
for cooling applications
• The entering dry bulb (EDB)
temperature for heating appli-
cations
• The entering water tempera-
ture (EWT) in both heating and
cooling applications
• Either the desired gallons per
minute (GPM) or the water
temperature change +T
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