8
7 SERIES 700A11 INSTALLATION MANUAL
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 the Aurora 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, FE
2
+ (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
