AAON SA-070 - Manual (Page 32)

32
NOTE: Ball valves should be installed in
the condenser water supply and return lines
for unit isolation and water flow balancing.
All manual flow valves should be of the ball
valve design. Globe or gate valves should
not be used due to high pressure drops and
poor throttling characteristics.
Pressure and temperature ports are
recommended in condenser water supply
and return lines for system balancing. These
openings should be 5 to 10 pipe diameters
from the unit water connections. To allow
for mixing and temperature stabilization,
wells in the water piping should extend at
least ½ pipe diameter into the pipe.
Table 4 - Condenser Pressure Drops (Each Heat Exchanger)
SA-023 SA-028 SA-030 SA-035
GPM PSI GPM PSI GPM PSI GPM PSI
45 4.2 45 4.2 45 4.2 45 1.7
39 3.3 39 3.3 39 3.3 39
35 2.8 35 2.8 35 2.8 35
SA-045 SA-050 SA-055 SA-058
GPM PSI GPM PSI GPM PSI GPM PSI
45 4.2 45 4.2 45 4.2 45 4.2
39 3.3 39 3.3 39 3.3 39 3.3
35 2.8 35 2.8 35 2.8 35 2.8
SA-060
SA-065
SA-070
Heat Exchanger 1 Heat Exchanger 2
GPM PSI GPM PSI GPM PSI GPM PSI
45 4.2 45 4.2 45 1.7 45 1.7
39 3.3 39 3.3 39 39
35 2.8 35 2.8 35 35
Each heat exchanger is equipped
with a refrigerant pressure relief
device to relieve pressure should
excessive
condensing pressures
(>675 psig) occur. Codes may
require
installing contractor to
connect and route relief piping
outdoors.
The relief valve has a 5/8”
male flare outlet connection.
CAUTION
Installing contractor is responsible for
properly sizing and installing water
system components. Improper fluid
flow due to valves, piping, or
improper pump operation may result
in unacceptable unit operation and
void warranty.
CAUTION