Well Water Systems; Cooling Tower/Boiler Systems - Bosch LM024 Installation, Operation And Maintenance Manual

LM Series Heat Pump

WELL WATER SYSTEMS

(Figure #10)
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.
Solenoid valves should be connected across Y1
and C1 on the interface board for all. Make sure
that the VA draw of the valve does not exceed the
contact rating of the thermostat.
COOLING TOWER/BOILER SYSTEMS
(Figure ##16)
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 FHP
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.
CAUTION: Water piping exposed to extreme
low ambient temperatures is subject to
freezing.
Revised 01-14
Consult the dimensional drawingsfor piping sizes.
Teflon tape sealer should be used when
connecting to the unit to insure against leaks and
possible heat exchanger fouling. Do not
overtighten 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 may be connected to the water loop and
should have all valves wide open.
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