AERCO KC1000 Heater w/Mod-Box Controller - Manual (Page 9)

INSTALLATION PROCEDURES
4
for startup and testing. It should be a minimum
of 3/4". It cannot be omitted (See Fig. 2.4a)
Figure 2.4a
Hose Bibb 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
0
F. Install the relief
valve as shown in Fig. 2.4. 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 pipied 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 2.4. 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.
Figure 2.4b
Pressure/Temperature Relief and Drain
Valve Installation Location
2.3.6 CONDENSATE PIPING
The KC Heater is designed to condense and the
installation must have provisions for suitable
drainage. A 1 inch ID silicone hose, supplied
with the unit, directs condensate from the
exhaust manifold to a stainless steel condensate
cup. The condensate cup is shipped loose and
should be installed inside the unit directly under
the manifold’s condensate drainage hole. The
condensate drain fitting is attached to the cup
and should be located at the rear of the unit as
shown in Figure 2.5. A 5/8-inch ID flexible
polypropylene tubing (or suitable equivalent)
should be used to carry the condensate by
gravity to a nearby floor drain. If a floor drain is
not available, a condensate pump can be used
to remove the condensate to a convenient drain.
The maximum condensate flow rate is 5 GPH.
The condensate cup and line must be
removable for routine maintenance. Do not
hard pipe.