Table 3. Spring Flex Isolators
Figure 4. Spring Flex Mountings
ADJUST MOUNTING SO UPPER
HOUSING CLEAR3 LOWER HOUSING
‘/2”
DIA
SY
AT LEAST %S 8 NOT
POSITIONING PIN
ACOUSTICAL NON-SKID
NEOPRENEPAD
Figure 5. Single Neoprene-in-Shear
Mounting
“D”
D,A
“S”
DIA
POSITIONING PIN
WATER PIPING
GENERAL
Since regional piping practices vary considerably, local or-
dinances and practices will govern the selection and installa-
tion of piping. In all cases local building and safety codes and
ordinances should be studied and complied with.
All piping should be installed and supported to prevent the
unit connections from bearing any strain or weight of the
system piping.
Vibration eliminators in all water piping connected to the
unit are recommended to avoid straining the piping and
transmitting pump noise and vibration to the building
structure.
It is recommended that temperature and pressure indicators
be installed within 3 feet of the inlet and outlet of the shells
to aid in the normal checking and servicing of the unit.
A strainer or some means of removing foreign matter from
the water before it enters the unit or the pump is recom-
mended. It should be placed far enough upstream to prevent
cavitation at the pump inlet (consult pump manufacturer for
recommendations). The use of a strainer will prolong pump
life and thus keep system performance up.
A preliminary leak check of the water piping should be
made before filling the system.
Shutoff valves should be provided at the unit so that nor-
mal servicing can be accomplished without draining the
system.
A WATER FLOW SWITCH OR PRESSURE DIFFERENTIAL
SWITCH MUST BE MOUNTED IN THE WATER LINES TO
THE EVAPORATOR TO ASSURE WATER FLOW BEFORE
STARTING THE UNIT
CHILLED WATER PIPING
The water flow entering the cooler must always be on the end
nearest the expansion valves and cooler refrigerant connec-
tions to assure proper expansion valve operation and unit
capacity (see pages 16 thru 20).
Design the piping so that it has a minimum number of
changes in elevation. Include manual or automatic vent valves
at the high points of the chilled water piping, so that air can
be vented from the water circuit. System pressures can be
maintained by using an expansion tank or a combination
pressure relief and reducing valve.
All chilled water piping should be insulated to prevent con-
densation on the lines. If insulation is not of the self-contained
vapor barrier type, it should be covered with a vapor seal.
Piping should not be insulated until completely leak tested.
Vent and drain connections must extend beyond pro-
posed insulation thickness for accessibility.
Page 6
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IM 508
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