Johnson Controls YORK YPC Series, Installation Manual

Page: 32 / 114

JOHNSON CONTROLS
32
SECTION 9 – HIGH-TEMPERATURE GENERATOR INLET STEAM PIPING
FORM 155.17-N1
ISSUE DATE: 4/1/2013
STEAM SEPARATOR
A steam separator should be in stalled after the auto-
matic shut-off valve. It is used to separate any liquid
(condensate) present in the supply steam. This steam
con den sate should normally be piped through a steam
trap, then to the condensate tank. The steam trap
(mounted below the steam separator) will pre vent any
steam from blow ing through the separator and into the
condensate re turn sys tem. The use of a steam sep a ra tor
and trap will allow only dry steam to enter the unit at
all times.
STEAM STRAINER
A fine mesh steam strainer (#50 mesh) is used to cap-
ture any impurities in the steam supply line. These
impurities may manifest themselves in the form of
dirt, rust, or precipitates. This strainer will prevent
the chiller system components from getting plugged.
Plugged components will reduce system capacity and
increase maintenance costs. A pressure gauge must be
installed just before and after the steam strainer. If the
pressure drop as read from these two gauges increases
to an unacceptable level, the steam strainer should be
re moved and cleaned.
PRESSURE REGULATOR (NOT SHOWN IN
FIG. 12)
A pressure regulator is not needed in all cases. It is
only necessary if the steam supply pres sure to the unit
will exceed 128 PSIG (8.83 bar). If the steam supply
pressure is known to fluctuate, it is rec om mend ed that
a steam pressure regulator be used.
PRESSURE RELIEF VALVE
A pressure re lief valve set to open at 150 PSIG (8.83
bar) must be installed to protect the high-temperature
steam gen er a tor shell.
STEAM CONTROL VALVE
This valve is sup plied by the Johnson Controls fac to-
ry and can be found among the unit’s shipped loose
parts (it is usu al ly packed in a large wood en crate).
This valve should be con nect ed to the ap pro pri ate wir-
ing har ness (also supplied by YORK) and is used to
control the amount of steam flow that en ters the unit.
It should be installed horizontally within 200 inches
(5.0 meters) of the first stage gen er a tor in let flange to
minimize steam pres sure drop be tween the exit of the
valve and the inlet of the gen er a tor. (See
Figure 12 on
page 33
Dimension H1 is a minimum of 40 inch es
(101.6 cm) to prevent con den sate back-
flow from the first stage gen er a tor into
the steam piping.