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Water Piping; Well Water Systems; Fresh Water Systems - Bosch EP015 Installation And Maintenance Manual

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Differential Pressure Switch


Water piping exposed to extreme low ambient
temperatures are subject to freezing.
Remember water freezes at 32°F.
Supply and return piping must be as large as the
water connections on the heat pump (larger on long
runs). Never use flexible hoses of a smaller inside
diameter than that of the water connections on the
unit. The heat pump units are supplied with either a
copper or optional cupro-nickel condenser.
Galvanized pipe or fittings are not
recommended for use with these units due to
the possible galvanic corrosion.
Both the supply and discharge water lines will sweat
if subject to low water temperature. These lines
should be insulated to prevent damage from
All manual flow valves used in the system must be
ball valves. Globe and gate valves must not be used
due to high pressure drop and poor throttling
Never exceed the recommended water flow rates.
Serious damage or erosion of the water to refrigerant
heat exchanger could occur.
Improper heat exchanger water flow due to
piping, valve arrangement or improper pump
operation is hazardous to the unit and
constitutes abuse which will void the heat
exchanger and compressor warranty.
All heat pump units are equipped with female pipe
thread fittings. Consult the specification sheets for
sizes. Teflon tape sealer should be used when
connecting water piping connections to the units to
ensure against leaks and possible heat exchanger
fouling. Do not over tighten the connections. Flexible
hoses should be used between the unit and the rigid
system to avoid possible vibration. Ball valves should
be installed in the supply and return lines for unit
isolation and unit water flow balancing.
No unit should be connected to the supply or return
piping until the water system has been completely
cleaned and flushed to remove any dirt, piping chips
or other foreign material. Supply and return hoses
should be connected together during this process to
Revised 12-13
Subject to change without prior notice
ensure the entire system is properly flushed. After the
cleaning and flushing has taken place the unit may be
connected to the water loop and should have all valves
wide open.


Copper is adequate for ground water that is not high in
mineral content. Should your well driller express concern
regarding the quality of the well water available or should
any known hazards exist in your area, we recommend
proper testing 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 cupro-nickel heat exchanger is recommended. In well
water applications water pressure must always be
maintained in the heat exchanger. This can be
accomplished with either 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 can be used to operate the well pump with the
heat pump.
When two or more units are supplied from one well, the
pump can be wired to operate independently from either
unit. An upsized VA transformer may be required in either


The Units shall be designed to operate throughout the range
of entering fluid temperature of 50°F to 110°F in the cooling
mode and 50°F to 80°F in the heating mode. Units shall have
an operating range of 25 °F to 80°F in the heating mode
when equipped with the optional extended range. In the
cooling mode, heat is rejected from the FHP unit into the
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