Water Piping; Well Water Systems - Bosch BP070 Installation And Maintenance Manual

12 CP/BP Series
operating Pressures and Temperatures
Operating pressures and temperatures in the reheat
mode vary slightly from standard cooling mode operat-
ing characteristics. The variations are as follows:
Discharge Pressure: (-) 5 to 20 PSIG
Discharge Gas Temperature: (-) 5°F to 15°F
Suction Pressure: (+) 5 to 10 PSIG
Suction Gas Temperature: (+) 5°F to 10°F

WaTer PIPInG

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 condensation.
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
characteristics.
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
6 720 220 045
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 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.

Well WaTer SySTeMS

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 (Refer to recommended methanol
concentration table in back of this manual). 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 (Figure #6) can be used to
operate the well pump with the heat pump.
C Y1 Y1
UNIT
TERMINAL
STRIP
(24VAC)
figure #6
Subject to change without prior notice
Water Piping
POWER SUPPLY
DP/ST RELAY
POWER TO PUMP
Revised 01-11