10
INSTALLATION (continued)
Double Check Pressure Equalizing Valve
The double check pressure equalizing valve
(22)
is provided to prevent a pressure build-up between
the
RuptureSeal
™ valve and the rupture disk, usually resulting from a seeping rupture disk. This
special double check pressure equalizing valve allows low pressure build-up to bleed-off, but re-seals
itself at high pressures or vacuum
.
Warning:
DO NOT obstruct relief of Double Check Pressure Equalizing Valve
(22)
.
Chillers Utilizing R-123 (
special piping instructions
)
Warning:
When installing the RuptureSeal™ on a chiller utilizing R-123, it is advised
that you pipe the output of the Double Check Pressure Equalizing Valve
(
22)
[after
removal of the filter/vent
(34)
] into the line running from the Valve Body water drain
hole
(24)
to the Drip Leg
(31)
. If there’s a rupture, this will prevent seepage of
R-123
into the equipment room. (See illustration at bottom right corner of Appendix “C” on
page 17.)
Leak Testing Procedure
Caution
: DO NOT use this procedure if chiller is at a pressure lower than 15” Hg.
Otherwise, accidental bursting of the rupture disk could occur by imploding the
rupture disk into the chiller!
1. Remove pipe plug (or alarm, if the optional
Redi Controls Alarm
™ is used) from alarm port
(35)
of Tee
(14)
.
2. Utilizing a 1/8” NPT x 1/4” Flair half union, connect a refrigeration manifold set (low side hose) to
the alarm port
(35)
of Tee
(14)
.
3.
Carefully raise the pressure level to
NO MORE THAN 5 PSI MAXIMUM,
and test for leaks using
standard leak testing procedures.
Warning:
During testing, to maintain pressure at such a low psi, you may have to
remove the filter/vent
(34)
and hold your finger over the outlet of the Double Check
Pressure Equalizing Valve. DO NOT use a plug in outlet of the Double Check Pressure
Equalizing Valve. If the plug were not removed, it would create a serious safety hazard.
4. At conclusion of Leak test procedure, release pressure and remove hose at fitting from Tee
(14)
.
Re-install the alarm or plug in the alarm port
(35)
of Tee
(14)
and secure tightly.
DO NOT
reinstall pipe plug or alarm in any position other than the alarm port
(35)
of Tee
(14)
.