Table of Contents
Advertisement
Chilled/hot water
connections
Submittals and product literature
detailing unit operation, controls
and connections should be
thoroughly reviewed before
beginning the connection of the
various cooling and/or heating
mediums to the unit.
Position all isolation, control and
balancing valves according to
the design drawings.
n Install all valves and make
all connections per industry
approved plumbing practices
and local codes.
n For 4-pipe coils, ensure that
the chilled water connection
is made to the chilled water
circuit and the hot water
connections be made to the
hot water circuit.
n It is recommended that the
unit be connected with readily
removable pipe lengths and
unions of flexible hoses to
permit disconnection and
removal of the unit should this
be required.
In preparing to make the
secondary water (SCHW) piping
connections to the coil, ensure
that the piping is aligned with the
coil connections. If threaded NPT
coil connections are provided,
use the correct tools to grip the
flare nut and union and apply
only sufficient force to make the
joint.
n Take care during this jointing
process to ensure that the coil-
piping alignment is maintained.
n Do not apply excessive force
in tightening water connection
fittings. The use of excessive
force could result in fracturing
of the water pipes or their
solder connections.
Connect the condensate drain
from the unit drip tray outlet to the
condensate drainage system (if
required).
n Should the system design not
require condensate drainage, leave
the sealing cap of the condensate
outlet in place.
The inlet supply connection is
the lowest coil stub-out with the
highest coil stub-out being the outlet
return connection (see dimensional
drawings). In the case of field
installed valve packages and piping,
the chilled water valve package
should be installed in such a way
that any dripping condensate is
captured in the drain pan/drip pan or
alternatively, is eliminated through
the use of insulation.
After the connections are completed,
the system should be tested for
leaks. Since some components are
not designed to hold pressure with
a gas, hydronic systems should be
tested with water. Test pressure must
not exceed 250 psig. Pressure testing
should be completed prior to sheet
rocking, finished floors, painting,
caulking, etc.
All water coils must be protected
from freezing after initial filling with
water. Even if the system is drained,
unit coils may still hold enough water
to cause damage when exposed to
temperatures below freezing.
In the event that leaking or defective
components are discovered, the
Zehnder Rittling sales representative
must be notified before any repairs
are attempted. All leaks should be
repaired before proceeding with the
installation.
After system integrity has been
established, the piping should
be insulated in accordance with
the project specifications. This is
the responsibility of the installing
or the insulation contractor.
Zehnder Rittling will not accept
any charges associated with
re-insulating piping if the
installing contractor failed to
establish system integrity prior to
insulating. All chilled water piping
and valves must be insulated to
prevent damage from sweating.
The condensate drain (where
applicable) should always be
connected and piped to an
acceptable disposal point. For
proper condensate flow, the
drain piping should be sloped
away from the unit at least 1/8
inch per foot. A P-trap may be
required by local codes and it
is strongly recommended for
odor containment. Condensate
drain lines should be at least
the same diameter as the drain
connection. Properly sized traps
should be used to allow proper
removal of the condensate from
the drain pan. The bottom of
the trap should be at least (1" +
cabinet static pressure) below
the drain pan connection. The
top of the trap should be at least
1" below the drain connection
when cabinet is under positive
pressure and ½ the distance of
the bottom of the trap from the
drain connection when cabinet is
under negative pressure.
Chilled/hot water connections
25
Advertisement
Table of Contents
