AERCO KC Series Equipped with C-More Controller for Massachusetts Only - Manual (Page 13)

INSTALLATION
2-3
Shut-off valves and union conections must be
installed in the inlet and outlet lines for main-
tenance. The use of dielectric unions is recom-
mended. Install the piping and accessories as
per the following drawings, located in Appendix F
of this manual.
• SD-A-424 for single units
• SD-A-425 for multiple units
• SD-A-432 for single units with a stratified
tank
• SD-A-434 for multiple units with a stratified
storage tank
NOTE:
All piping must be arranged so that it does
not interfere with removal of any cover,
inhibit service or maintenance, or prevent
access between the unit and walls, or
another unit.
Figure 2.3
Inlet and Outlet Location
2.3.3 TEST HOSE BIB
A Test Hose Bib connection, upstream of the
shut off valve on the hot water outlet, is required
for startup and testing. It should be a minimum
of 3/4". It cannot be omitted (See Fig. 2.4a)
Figure 2.4a
Hose Bib Location
2.3.4 PRESSURE/TEMPERATURE
RELIEF AND DRAIN VALVE
INSTALLATION
An ASME rated Pressure/Temperature Relief
Valve is supplied with each unit. The valve
setpoint is 150 psig/210 ° F. Install the relief valve
as shown in Fig. 2.4b. A suitable pipe compound
should be used on the threaded connections.
Any excess should be wiped off to avoid getting
any into the valve body. The relief valve should
be piped to within 12 inches of the floor to
prevent injury in the event of a discharge. The
relief piping must be full size, 1-1/2”, without
reduction. No valves, restrictions, or other
blockages are allowed in the discharge line. In
multiple unit installations the discharge lines
must not be manifolded together. Each must be
individually run to a suitable discharge location.
A 1” drain valve assembly is furnished with each
unit. The assembly should be installed as shown
in Figure 2.4b. The drain should be hard piped to
a suitable drain.
2.3.5 SYSTEM RECIRCULATION
The system recirculating line ties into the unit at
the recirculating tee fitting provided in the drain
valve assembly (see Fig. 2.4b). Shut off valves
and union connections are recommended for
maintenance. Recirculation flow rates must be
kept to 8 gpm or less. In a multiple unit
installation, each unit must be tied into the
system recirculation system.