Ground-Water Heat Pump Applications
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CAUTION!
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CAUTION!
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Figure 2: Typical Open Loop/ Well Application
Air Pad or
Extruded
polystyrene
insulation board
Unit Power
Disconnect
Pressure
Tank
Flow
Regulator
Water
Control
Valve
P/T Plugs
Water Out
Shut-Off
Valve
Boiler
Drains
Water In
Optional
Filter
Thermostat Wiring
Wa t e r- t o - Wa t e r ( 5 0 Y E R ) S e r i e s - P u r o n
®
R e v. : 1 J u l y, 2 0 1 0
12
CAUTION!
Refrigerant pressure activated water regulating
valves should never be used with geothermal heat pump
equipment.
CAUTION!
Many units are installed with a factory or field
supplied manual or electric shut-off valve.
DAMAGE WILL
OCCUR
if shut-off valve is
closed
during unit operation. A
high pressure switch must be installed on the heat pump
side of any field provided shut-off valves and connected to
the heat pump controls in series with the built-in refrigerant
circuit high pressure switch to disable compressor
operation if water pressure exceeds pressure switch
setting. The field installed high pressure switch shall have
a cut-out pressure of 300 psig and a cut-in pressure of
250 psig. This pressure switch can be ordered with a 1/4”
internal flare connection as part number 39B0005N02.
