Bosch FHP EC Large Series Installation, Operation And Maintenance Manual page 20

20 | Cooling Tower/Boiler Systems
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.
NOTE: 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
overtighten the connections. Flexible hoses should
be used between the unit and the rigid system to
avoid possible vibration. Ball valves should be
[1] Line voltage disconnect (unit)
[2] Low voltage control connection
[3] P/T ports (optional)
[4] Hose kits (optional)
[5] Ball valves
T111970289 (2015/01)
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.
NOTE: 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. (Figure #21)
Figure # 17
[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
EC Series
EC Series