Cooling Tower/Boiler Systems - Bosch QV Series Installation, Operation And Maintenance Manual

QV Series Heat Pumps

Cooling Tower/Boiler Systems

(Refer to Fig. 14)
These systems typically use a common loop
temperature maintained at 50°F to 100°F to
ensure adequate cooling and heating performance.
In the cooling mode, heat is rejected from the unit
into the water loop. A cooling tower provides
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
temperature.
This diagram shows a typical
installation and is for illustration
purposes only. Ensure access to
Heat Pump is not restricted.
Fig. 14 Typical Cooling Tower and Boiler System Setup
[1] Line-Voltage Disconnect (unit)
[2] Low-Voltage Control Connection
[3] P/T Plugs (optional)
[4] Hose Kits
[5] Ball Valves
[6] Supply and Return Line of Central System
QV Series Heat Pumps
NOTICE: Water piping exposed to extreme
low ambient temperatures is subject to
freezing.
To ensure against leaks and possible heat
exchanger fouling, use Teflon tape thread
sealant. (Teflon is a registered trademark of
DuPont).
Consult the dimensional drawings on pages #51
through #54 for piping sizes.
To avoid possible vibration, use flexible hoses
between the unit and the rigid system. For unit
isolation and unit water-flow balancing, install ball
valves in the supply and return lines.
[7] Flex Duct Connection
[8] Hanging Bracket Assembly
[9] Threaded Rod
Subject to change without prior notice
Specific Application Considerations | 21
8733829041 (2021/07)