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Well
Water
Systems
IMPORTANT:
Table 1 must be consulted for water quality
requirements when using open loop systems. A water sample must
be obtained
and tested, with the results compared to the table.
Scaling
potential
should
be
assessed using
the pH/Calcium
hardness method.
If the pH is <7.5 and the calcium hardness is
1<100 ppm, the potential for scaling is low. For numbers out of the
range listed, a monitoring
plan must be implemented
due to
probable scaling.
Other potential issues such as iron fouling, corrosion, erosion and
clogging must be considered. Careful attention to water conditions
must be exercised when considering a well water application.
Failure to perform water testing and/or applying a geothermal heat
pump to a water supply that does not fall within the accepted
quality parameters will be considered a mis-application
of the unit
and resulting heat exchanger failures will not be covered under
warranty.
Where a geothermal system will be used with adverse
water conditions, a suitable plate-frame heat exchanger MUST be
used to isolate the well water from the geothermal unit.
Proper testing is required to assure the well water quality is suitable
for use with water source equipment.
In conditions anticipating moderate scale formation or in brackish
water, a cupronickel heat exchanger is recommended.
Copper is
adequate for ground water that is not high in mineral content.
In well water applications,
water
pressure
must
always
be
maintained in the heat exchanger. This can be accomplished with
either a control valve or a bladder type expansion tank.
When well water is used exclusively for supplying water to the
heat pump, the pump should operate only when the heat pump
operates. A 24 volt double pole single throw (DP/ST) contactor
(Fig. 2) can be used to operate the well pump with the heat pump.
(_
POWER SUPPLY
UNIT II
[
TEs_T_NAL
II
L
[
DP/ST
RELAY
POWER TO PUMP
A14166
Fig. 2 - 24 volt DP/ST Contactor
When two or more units are supplied from one well, the pump can
be wired to operate independently from either unit (see Fig. 3). An
up-sized VA transformer may be required in either case.
(_
POWER
SUPPLY
TE# "', ALII ' II I 20P;ST
q
STRIP
II
,-.d-_e"'_-_l
RELAYS_r'-:"
"_
t
t
_
POWER
TO PUMP
Fig. 3 - DP/ST
Independent
Wiring
A14167
11
6
7
WELL
WATER
APPLICATIONS
(50°F
EWT
MIN.)
1.
LIN E VOLTAGE
DISGON
NECT
( U NIT)
2.
FLEX DUCT
CONNECTION
3.
LOW VOLTAGE
CONTROL
CON NECTION
4.
LIN E VOLTAGE
CONN
ECTION
5.
VIBRATION
PAD
6.
PIT PORTS
7.
HOSE
KITS
(Optional)
8.
BALL
VALVES
9.
SOLENOID
VALVE
SLOW
CLOSING
10.
CONDENSATE
DRAIN
CON N ECTION
11.
PRESSURETANK
12.
LIN E VOLTAGE
DISCON
NECT
( ELECTRIC
H EATER)
NOTE:
SEE FIGURE
#3 FOR CONDENSATE
DRAIN
CONNECTION
Fig. 4 - Well Water
Application
A14159
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