AERCO KC1000 Heater 2002 - Manual (Page 11)

INSTALLATION
2-3
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 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 2.4b. 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.
Figure 2.4b
Pressure/Temperature Relief and Drain
Valve Installation Location
2.3.6 CONDENSATE PIPING
The KC Heater is designed to condense.
Therefore, the installation site must include
suitable provisions for condensate drainage or
collection. A stainless steel condensate cup is
separately packed within unit’s shipping
container. To install the condensate cup,
proceed as follows:
1. Remove the left side panel and only the left
half of the rear cover to provide access to the
exhaust manifold and burner (Figure 2.5).
2. Insert the 1-3/4 inch manifold drain hose into
the condensate cup. Allow the cup to rest on
the floor directly beneath the manifold drain
hole (Figure 2.5).
3. Attach a length of 3/4 inch I.D. polypropylene
tubing to the condensate cup drain tube and
route it to a floor drain. . If a floor drain is not
available, a condensate pump can be used to
remove the condensate to drain. The
condensate drain line must be removable for
routine maintenance. Therefore, DO NOT
hard-pipe.
4. Replace the rear cover and side panel on the
unit.