Cooling Tower/Boiler Application - Bard QW Series Installation Instructions Manual

WARNING
Thin ice may result in the vicinity of the
discharge line.
For complete information on water well systems and
lake and pond applications, refer to Manual 2100-078
available from your distributor.
COOLING TOWER/BOILER
APPLICATION
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 unit
into the source 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
minerals.
It is imperative that all air be eliminated from the
source closed loop side of the heat exchanger to ensure
against fouling.
Manual 2100-577C
Page 42 of 50
TABLE 8
Water Flow and Pressure Drop
QW2S1 & QW3S1
GPM
PSIG Ft. Hd.
3 0.1 0.23
4 0.5 1.15
5 1.2 2.77
6 1.7 3.92
7 2.3 5.31
8 3.1 7.15
9 4.1 9.46
10
11
12
13
14
15
16
17
18
In the heating mode, heat is absorbed from the source
water loop. A boiler can be utilized to maintain the
loop at the desired temperature. In milder climates a
"flooded tower" concept is often used. This concept
involves adding makeup water to the cooling tower
sump to maintain the desired loop temperature.
CAUTION
Water piping exposed to extreme low ambient
temperatures are subject to freezing.
Units are equipped with double O-ring (female pipe
thread) fittings. Consult the specification sheets
for sizes. Teflon tape sealer should be used when
connection to the unit to ensure against leaks and
possible condenser 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 rate
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
refrigerant to water heat exchangers water side pressure
drop. See Table 8 for water flow and pressure drop
information.
QW4S1 QW6
PSIG Ft. Hd. PSIG Ft. Hd.
0.9 2.08
1.4 3.23
2.3 5.31
3.2 7.38 2
4.1 9.46 2.5
5.1 11.77 3.2
6.1 14.07 3.9
7.1 16.38 4.7
8.2 18.92 5.5
9.4 21.69 6.4
10.6 24.45 7.3
8.1
9
9.9
4.61
5.77
7.38
9.00
10.84
12.69
14.76
16.84
18.69
20.76
22.84