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Cooling Tower/Boiler Systems - Bosch Greensource SM024 Installation, Operation And Maintenance Manual

Greensource cdi series sm model water-to-air heat pumps
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Greensource CDi Series SM Model

Cooling Tower/Boiler Systems

The cooling tower and boiler water loop
temperature is usually maintained between 50°F
to 100°F to ensure adequate cooling and heating
performance. In the cooling mode, heat is ejected
from the 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
ensure 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
NOTICE: Water piping exposed to extreme
low ambient temperatures is subject to
NOTICE: Gaskets are used with swivel
fittings. See Swivel Fitting Gasket
Installation on page #19.
This diagram shows a typical
installation and is for illustration
purposes only. Ensure access to
Heat Pump is not restricted.
Fig. 54 Typical Cooling Tower and Boiler System Setup
[1] Line voltage disconnect (unit)
[2] Low voltage control connection
[3] P/T ports (optional)
[4] Hose kits (optional)
[5] Ball valves
Greensource CDi Series SM Model
Cooling Tower/Boiler Systems Piping
Consult the specification sheets for pipe
connection sizes.
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.
[6] Supply and return line of central system
[7] Flex duct connection
[8] Hanging bracket assembly
[9] Threaded rod
[10] Hanging bracket assembly
Subject to change without prior notice
Specific Application Considerations | 25
8733819578 (2019/02)

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