JOHNSON CONTROLS
35
SECTION 3 - INSTALLATION
FORM 160.84-N1
ISSUE DATE: 11/22/2016
3
MAKE CONNECTIONS
After the unit is leveled, place wedges and/or shims un-
der each corner to solidly support the unit in this position
while connecting and hanging the piping, adjusting the
connections, and checking for proper alignment.
The coolant temperature inside any JCI-supplied liq-
uid-cooled motor starter must be maintained above the
dewpoint temperature in the equipment room to prevent
condensing water vapor inside the starter cabinet. There-
fore, an additional temperature-controlled throttle valve
is needed in the flow path for the starter heat exchanger
to regulate cooling above the equipment room dewpoint
for applications using cooling sources other than evapo-
rative air-exchange methods, such as wells, bodies of
water, and chilled water. The temperature control valve
should be the type to open on increasing drive coolant
temperature, fail-closed, and set for a temperature above
dewpoint. It can be requested as factory-supplied on a
chiller order by special quotation.
Piping Connections
After the unit is leveled (and wedged in place for op-
tional spring isolators) the piping connections may be
made; chilled water, condenser water and refrigerant
relief. The piping should be arranged with offsets for
flexibility, and adequately supported and braced inde-
pendently of the unit to avoid strain on the unit and
vibration transmission refer to Figure 26 on page 38.
Hangers must allow for alignment of pipe. Isolators
(by others) in the piping are highly desirable, and may
be required by specifications, in order to effectively
utilize the vibration isolation characteristics of the vi-
bration isolation mounts of the unit. Piping connecting
to chillers on spring isolators should be isolated with
properly aligned and supported flexible connections.
Otherwise, the piping joint becomes the primary resis-
tance to motion and pipe or fittings are likely to deform
or fatigue during operation.
Check for strain on piping – It is critical that no
strain is present on the relief valve when the piping is
connected. Any strain must be eliminated to minimize
the potential to deform the seal surfaces and cause
a leak. When checking for piping stress in Pressure
Relief Piping:
1. Perform a visual inspection of the existing piping
to determine if there are any clear signs of strain
present.
2. Disconnect piping at ange or union connection if
possible. When the piping is disconnected, there
should be no springing or movement noted. The
piping system must be self supported and in per-
fect alignment with the relief valves.
FIGURE 24 - PRESSURE RELIEF PIPING
LD17201
Check for piping alignment – Upon completion of
piping, a connection in each line as close to the unit
as possible should be opened, by removing the flange
bolts or coupling and checked for piping alignment. If
any of the bolts are bound in their holes, or if the con-
nection springs are out of alignment, the misalignment
must be corrected by properly supporting the piping or
by applying heat to anneal the pipe.
If the piping is annealed to relieve stress,
the inside of the pipe must be cleaned of
scale before it is nally bolted in place.
After the connections are made the unit can be filled
with water and checked for leaks.
If spring isolators were installed, final adjustments
can be made to the leveling bolts until the wedges and
shims can be removed. The unit should now be in cor-
rect level position, clear of the floor or foundation and
without any effect from the weight of the piping.
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