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fresh Water Systems
When two or more units are supplied from one well,
the pump can be wired (Figure #7) to operate
independently from either unit. An upsized VA
transformer may be required in either case.
C
Y1
UNIT
TERMINAL
STRIP
(24VAC)
C
Y1
figure #7
Pressure/temperature ports are recommended in
both the supply and return lines for system flow
balancing. The water flow can be accurately set by
measuring the water-to-refrigerant heat exchangers
water side pressure drop. See the unit specification
sheets for the water flow and pressure drop
information in the back of this manual.
The discharge water from the heat pump is not
contaminated in any manner and can be disposed
of in various ways depending on local codes (i.e.
discharge well, dry well, storm sewer, drain field,
stream, pond, etc.)
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.
Solenoid valves should be connected across Y and
C on the interface board for all. Make sure that the
VA draw of the valve does not exceed the contact
rating of the thermostat.
freSH WaTer SySTeMS
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 Bosch unit into the water loop. A
Revised 01-11
POWER SUPPLY
2 DP/ST
RELAYS
POWER
TO PUMP
Caution
Subject to change without prior notice
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.
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 in the back of this manual.
earTH CouPled SySTeMS
Closed loop and pond applications require
specialized design knowledge. No attempt at these
installations should be made unless the dealer has
received specialized training. Utilizing Bosch's
Ground Loop Pumping Package (GLP), makes the
installation easy. Anti-freeze solutions are utilized
when low operating conditions are expected to
occur. Refer to the GLP installation manuals for
more specific instructions. A wrapped water coil
option is required for this application.
System Checkout
After completing the installation, and before
energizing the unit, the following system checks
should be made prior to initial startup:
• Verify that the supply voltage to the heat pump is
in accordance with the nameplate ratings
• Make sure that all electrical connections are tight
and secure
• Check the electrical fusing and wiring for the
correct size
6 720 220 045
CP/BP Series 13
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