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VICTAULIC COUPLING INSTALLATION
1.
The outside surface of the pipe, between the groove and the
pipe end, must be smooth and free from indentations, projec-
tions (including weld seams), and roll marks to ensure a leak-
tight seal. All oil, grease, loose paint, and dirt must be
removed.
2.
Apply a thin coat of Victaulic lubricant or silicone lubricant to
the gasket sealing lips and exterior.
CAUTION
Always use a compatible lubricant to prevent the gasket from
pinching or tearing during installation. Failure to follow this
instruction could result in joint leakage.
3.
Position the gasket over the pipe end. Make sure the gasket
does not overhang the pipe end.
4.
Align and bring the two pipe ends together. Slide the gasket
into position and center it between the groove in each pipe
end. Make sure no portion of the gasket extends into the
groove in either pipe end.
5.
Install the housings over the gasket.
NOTE: Make sure the housings' keys engage the grooves
completely on both pipe ends.
CAUTION
Make sure the gasket does not become rolled or pinched while
installing the housings. Failure to follow this instruction could
cause damage to the gasket, resulting in joint leakage.
6.
Install the bolts, and thread a nut finger-tight onto each bolt.
For couplings supplied with stainless steel hardware, apply an
anti-seize compound to the bolt threads. Make sure the oval
neck of each bolt seats properly in the bolt hole.
7.
Tighten the nuts evenly by alternating sides until metal-to-
metal contact occurs at the bolt pads. Make sure the housings'
keys engage the grooves completely.
NOTE: It is important to tighten the nuts evenly to prevent
gasket pinching.
8.
Visually inspect the bolt pads at each joint to ensure metal-to-
metal contact is achieved.
UNITS
WITH
FACTORY-INSTALLED
PACKAGES
The 30RC chillers with factory-installed hydronic packages are
designed for use with closed systems, meaning that there is no
more than one water-air interface in the water loop. Cooling tower
loops, for example, have two water-air interfaces (sump and noz-
zles) and would thus be classified as open, whereas a correctly de-
signed chilled water loop with the only water-air interface being in
the expansion tank is closed. Since closed and open water systems
behave very differently, these instructions assume that the chilled
water loop is closed. A system installed incorrectly such that air is
not handled properly — pipe leaks, vent leaks, air in pipes, etc. —
may behave as an open system and thus have unsatisfactory oper-
ation. Pump seal wear can also cause leaks that cause poor system
operation.
Proper closed system design and installation procedures should be
followed closely. The system must be constructed with pressure-
tight components and thoroughly tested for installation leaks. Fac-
tory-supplied hydronic systems are available with single or dual
(for back-up) pumps.
Figure 14-16 shows a typical installation with components that
might be installed with the hydronic package of the 30RC unit.
The factory-installed system includes all of the components within
the dashed lines. Figure 17 illustrates a typical dual pump package
for the 010-030 size models.
NOTE: For units with single pumps, it is recommended that isola-
tion (shutoff) valves be placed exterior to the unit to allow removal
and service of the entire pump assembly, if necessary. Units with
dual pumps have pump isolation valves provided. Also, if the unit
is isolated with valves, a properly sized pressure relief valve
should be installed in the piping between the unit and the valves,
following all applicable state and local codes.
System Pressurization
A proper initial cold fill pressure must be established before the
filling of the unit. The initial cold fill pressure is the pressure ap-
plied at the filling point to fill a system to its highest point, plus a
minimum pressure at the top of the system (4 psi [28 kPa] mini-
mum) to operate air vents and positively pressurize the system.
The compression tank (sometimes called expansion tank) is very
important to system pressurization. The compression tank actually
serves several purposes:
1.
Provides net positive suction head required (NPSHR) for the
pump to operate satisfactorily.
2.
Sets system pressure.
3.
Accommodates expansion/contraction of water due to tem-
perature changes.
4.
Acts as a pressure reference for the pump.
25
HYDRONIC
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