Well Water Systems; Cooling Tower / Boiler Application - Bosch CE SPLIT series Installation And Maintenance Manual

Installation of Pressure
Always check refrigerant type on the unit data
plate before servicing. Do not use R22
manifold gauges on R-410A units. Doing so
could result in severe injury.
InSTallaTIon of PrESSurE
rEGulaTInG ValVES
Pressure regulating valves are used to increase or
decrease water flow through the heat pump in
response to refrigerant pressure. In some cases
more water may be required in heating than in
cooling, or vice versa. With the CE heat pumps these
valves are not required. However, if installed, a pair
of valves are required for proper operation, one valve
for cooling (direct acting) and another valve for
heating (indirect acting) or one dual acting valve. A
refrigerant tap is provided in the refrigerant line
located between the reversing valve and the water-
to-refrigerant heat exchanger for proper monitoring
of the refrigerant pressures.
The discharge water from the heat pump is not
contaminated in any manner and can be disposed of
in various ways depending on local building codes
(i.e. discharge well, dry well, storm sewer, drain
field, stream or pond, etc.) Most local codes forbid
the use of a sanitary sewer for disposal. Consult your
local building and zoning department to insure
compliance in your area.

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. 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 using a single water well
to supply both domestic water and the heat pump
care must be taken to insure that the well can
provide sufficient flow for both. In well water
applications a slow closing solenoid valve must be
used to prevent water hammer.
Revised 03-11
Caution
Subject to change without prior notice
Solenoid valves should be connected across Y1 and
C1 on the interface board. Make sure that the VA
draw of the valve does not exceed the contact rating
of the thermostat.
CoolInG TowEr/boIlEr SYSTEMS
The cooling tower and boiler water loop temperature
is usually maintained between 50°F to 100°F to
assure adequate cooling and heating performance.
In the cooling mode, heat is rejected from the Bosch
unit into the water loop. A cooling tower provides
evaporative cooling to the loop water thus
maintaining a constant supply temperature to the
unit. When utilizing open cooling towers, chemical
water treatment is mandatory to ensure the water is
free from corrosive elements. A secondary heat
exchanger (plate frame) between the unit and the
open cooling tower may also be used. It is imperative
that all air be eliminated from the closed loop side of
the heat exchanger to insure against fouling.
In the heating mode, heat is absorbed from the
water loop. A boiler can be utilized to maintain the
loop at the desired temperature.
Water piping exposed to extreme low ambient
temperatures is subject to freezing.
Consult the specification sheets for piping sizes.
Teflon tape sealer should be used when connecting
to the unit to insure 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. Pressure/temperature ports
are recommended in both supply and return lines for
system flow balancing. Water flow can be accurately
set by measuring the water-to-refrigerant heat
exchangers water side pressure drop. See
specification sheets for water flow vs. pressure drop
information
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
6 720 220 049
CE Split Series 15