9
1/2'' Pitch
Drain
1.5 in. 1.5 in.
PVC tube stub
PVC coupling Vent (if needed)
PVC tube stub
1/8 in. per foot
NOTE: Check dimensional data for actual PVC sizes.
Figure 6: Unit Pitch for Drain
Figure 5: Horizontal Drain Connection
Low Water Coil Limit
Set the freeze sensing switch SW2-1 on the Aurora Base Control
(ABC) printed circuit board for applications using a closed loop
antifreeze solution to “LOOP” (15°F). On applications using an
open loop/ground water system (or closed loop no antifreeze), set
this dip switch to “WELL” (30°F), the factory default setting. (Refer
to the DIP Switch Settings table in theAurora Control section.)
Condensate Drain
On vertical units, the internal condensate drain assembly consists
of a drain tube which is connected to the drain pan, a 3/4-inch PVC
female adapter and a flexible connecting hose. The female adapter
may exit either the front or the side of the cabinet. The adapter
should be glued to the field-installed PVC condensate piping.
On vertical units, a condensate hose is inside all cabinets as a
trapping loop; therefore, an external trap is not necessary.
On horizontal units, a PVC stub is provided for condensate drain
piping connection. An external trap is required (see below). If a
vent is necessary, an open stand pipe may be applied to a tee in
the field-installed condensate piping.
Water Quality
In ground water situations where scaling could be heavy or where
biological growth such as iron bacteria will be present, a closed
loop system is recommended. The heat exchanger coils in ground
water systems may, over a period of time, lose heat exchange
capabilities due to a buildup of mineral deposits inside. These
can be cleaned, but only by a qualified service mechanic, as
special solutions and pumping equipment are required. Hot water
generator coils can likewise become scaled and possibly plugged.
In areas with extremely hard water, the owner should be informed
that the heat exchanger may require occasional flushing.
Units with cupronickel heat exchangers are recommended for
open loop applications due to the increased resistance to build-up
and corrosion, along with reduced wear caused by acid cleaning.
Failure to adhere to the guidelines in the water quality table could
result in the loss of warranty.
General Installation Information cont.
Material Copper 90/10 Cupronickel 316 Stainless Steel
pH Acidity/Alkalinity 7 - 9 7 - 9 7 - 9
Scaling Calcium and
Magnesium Carbonate (Total Hardness)
less than 350 ppm (Total Hardness)
less than 350 ppm (Total Hardness)
less than 350 ppm
Corrosion
Hydrogen Sulfide Less than 0.5 ppm (rotten egg
smell appears at 0.5 ppm) 10 - 50 ppm Less than 1 ppm
Sulfates Less than 125 ppm Less than 125 ppm Less than 200 ppm
Chlorine Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm
Chlorides Less than 20 ppm Less than 125 ppm Less than 300 ppm
Carbon Dioxide Less than 50 ppm 10 - 50 ppm 10 - 50 ppm
Ammonia Less than 2 ppm Less than 2 ppm Less than 20 ppm
Ammonia Chloride Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm
Ammonia Nitrate Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm
Ammonia Hydroxide Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm
Ammonia Sulfate Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm
Total Dissolved Solids (TDS) Less than 1000 ppm 1000 - 1500 ppm 1000 - 1500 ppm
LSI Index +0.5 to -0.5 +0.5 to -0.5 +0.5 to -0.5
Iron Fouling
(Biological Growth)
Iron, FE2+ (Ferrous)
Bacterial Iron Potential < 0.2 ppm < 0.2 ppm < 0.2 ppm
Iron Oxide Less than 1 ppm, above this level
deposition will occur Less than 1 ppm, above this level
deposition will occur Less than 1 ppm, above this level
deposition will occur
Erosion Suspended Solids Less than 10 ppm and filtered for
max. of 600 micron size Less than 10 ppm and filtered for
max. of 600 micron size Less than 10 ppm and filtered for
max. of 600 micron size
Threshold Velocity
(Fresh Water) < 6 ft/sec < 6 ft/sec < 6 ft/sec
NOTES: Grains = ppm divided by 17
mg/L is equivalent to ppm 2/22/12
AFFINITY SINGLE & DUAL CAPACITY SERIES INSTALLATION MANUAL
