AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 16)

HE-
111 − INSTALLATION
Rev B Mar 2013 2-6
The AERCO recommended heat exchanger and Control Valve piping arrangements for single and
parallel heat exchanger installations are presented in Appendix C.
11. For best heat exchanger performance, OBSERVE THE FOLLOWING VERY CAREFULLY when
installing the heat exchanger piping:
a. Do not use cement or red lead when assembling pipe joints.
b. For heat exchanger connection types, sizes, and exact locations, see Figure 2-1, Figure 2-2 or
Figure 2-3.
c. All piping to the heat exchanger top head should be provided with unions or flanges LOCATED
BEYOND THE OUTSIDE DIAMETER OF THE HEAT EXCHANGER HEAD to permit removal of
the head and shell for in-place maintenance.
d. Include all of the stop valves, check valves, steam traps, strainers and other elements shown in
Appendix C, or as specified separately by AERCO.
e. If the heat exchanger is furnished with the Control Valve not connected as shown in Figure 2-1,
Figure 2-2, or Figure 2-3, make the piping between the Control Valve and the heat exchanger as
short as possible, with sufficient unions or flanges included to allow easy Valve removal.
f. Reductions from a pipe to a smaller size connection at the heat exchanger or Control Valve
should be made directly at the heat exchanger or Valve connection. Expansions from a pipe to a
larger size connection at the heat exchanger or Control Valve should be made as far as practical
from the heat exchanger or Valve connection.
g. The condensate return piping must be arranged to permit condensate to drain freely by gravity
from the heat exchanger connection. If condensate drain by gravity is not feasible, you may
substitute a pumping steam trap. Refer to the trap manufacturer’s instructions for sizing and
installation procedures.
CAUTION
Failure to provide proper condensate drainage can result in improper
operation of the heat exchanger and/or damage to the heat exchanger
condensate drainage system.
h. All drain discharges
― relief valve, over-temperature solenoid valve and heat exchanger shell
drain
― should be piped directly to a convenient floor drain.
IMPORTANT
Before making final piping connections to and from the heat exchanger
and Control Valve, blow out all piping thoroughly.
2.4 INSTALLING THE CXT-E ELECTRONIC CONTROL SYSTEM
The Control Box and all other Electronic Control System (ECS) components are installed on the heat
exchanger assembly before it is shipped from the factory, so that the ECS installation consists of
connecting AC power to the Control Box and making the internal power and control connections to the
CXT-E Control Valve. However, if your ECS was ordered with the MODBUS Communication option, you
are required to make several additional connections (starting with step 8, below) to enable the ECS to be
controlled by an external Energy Management System (EMS), Building Automation System (BAS) or
computer.