Step 3 -- Cooler Fluid And Drain Piping; Freeze Protection; Units With Hydronic Pump Package; Units Without Hydronic Pump Package - Carrier AQUASNAP 30RB060-390 Installation Instructions Manual

Step 3 -- Cooler Fluid and Drain Piping Con-
nections -- The 30RB units are supplied with a factory-
installed flow switch in the leaving water (fluid) piping. Flow
switch wiring is Ihctory installed.
To facilitate servicing it is recolrnnended additional field-
supplied air vents be installed to thcilitate smicing. Locate air
vents at the highest possible point of the chilled water system.
In addition to field-supplied air vents, thcititate servicing in ad-
dition to flow balancing by installing field-supplied shut-off"
valves, thermometers, clean-out tees, pressure and temperature
taps in the inlet and outlet piping. Locate vanes in retum and
supply cooler water lines as close to the chiller as possible.
In sound sensitive applications, consider the installation of
piping vibration isolators.
FREEZE PROTECTION Upon completion of the field
piping installation, tieeze protection must be considered.
Freeze protection for file cooler is available from the factory
with a tieeze protection option Ibr the unit. Freeze protection
for the pump (hydronlc) package is standard on all units with
the optional hydronic package (30RB060-190 units). External
piping tieeze protection also must be considered. Since power
is sometimes lost for extended periods during winter storms,
fieeze protection provided by heater tapes will be effective
only if a back-up power supply can be assured for the unit's
control circuit, heater and cooler pump. If not protected with
an antitieeze solution, draining the cooler and outdoor piping
is recolrnnended if the system will not be used during fieezing
weather conditions.
NOTE: See page 39 for a more detailed overview of fieeze
protection.
!
IMPORTANT: Glycol anti-freeze solutions are highly [
recommended since heater tapes provide no protection
I
in the event of a power thiture
UNITS WITH HYDRONIC PUMP PACKAGE Tile
30RB060-190 units can be equipped with a thctory-instalted
hydronic pump package consisting of a suction guide/strainei;
pump, combination valve, intemat piping and wiring con-
nected at the factory.
The combination valve performs the following functions:
• Drip-tight shut-offvalve
• Spring closure design with a non-slam check valve
• Flow-throttling valve
When facing the cooler side of unit, the inlet (return) water
connection is on the right. The outlet (supply) water connection
is on the left. The inlet is connected to the suction mlide/
strainer of the pmnp via a Victaulic-type connection. The cool-
er supply has water-side Victautic-type connections (tbllow
connection directions as provided by the coupling manuthctur-
er). Provide proper support for the piping. If compressor and
cooler grilles have been added, holes must be cut in the grilles
for field piping and insulation.
The suction guide/strainer is shipped fiom the thctory with a
ran-in screen. This screen is a temporary device used during
the start-up/clean-up process of the chilled water circuit to
prevent construction debris fiom damaging the pump or
internal tubes of cooler. After all debris has been removed or a
maximum of 24 running hours the temporary screen must
be removed. See the Start-Up, Controls, Operation and
Troubleshooting guide for further information.
The suction mlide/strainer is shipped tiom the fiactory with
a ran-in screen. This temporary screen must be removed
after all debris has been removed or a maximum of 24 run-
ning hours. Failure to remove the temporary screen may
result in damage to the pump or cooler.
NOTE: It is required that a 20 mesh field-supplied strainer be
installed in the inlet piping to the cooler on open loop systems.
A
3/4
in. NPT fitting is installed in the inlet piping of the
pmnp for connection to an expansion tank. Install the tank in
accordance with the manul:acmrer's instructions.
Figures 20 and 21 illustrate typical single and dual pump
packages.
Three drain connections are provided and are located at
leaving water (supply) end of coolei; pump volute, and the
suction guide. See Fig. 2-13 tbr connection location. Insulate
the drain piping (in the same manner as the chilled ,a_aterpip-
ing) for at least 1 ft (305 lrnn) fiom the cooler.
UNITS WITHOUT HYDRONIC PUMP PACKAGE When
thcing the cooler side of the unit, the inlet (return) ,a_atercon-
nection is on the right. It is required that a field-supplied strain-
er with a minimum size of 20 mesh be installed ahead of the
cooler inlet to prevent debris fiom &nnaging internal tubes of
the cooler. The outlet (supply) water connection is on the left.
The cooler has water-side victaulic-type connections (follow
connection directions as provided by the coupling manuthctur-
er). Provide proper support for the piping. If compressor and
cooler grilles have been added, holes must be cut in the m-itles
for field piping and insulation. See FN. 22 tbr a typical piping
diamam ofa 30RB unit without a hydronic pump package.
A drain connection is located at the leaving water (supply)
end of cooler. See Fig. 2-13 for connection location. Insulate
the drain piping (in the same manner as the chilled water
piping) tbr at least 12 in. (305 mm) fiom the unit.
FOR ALL UNITS
Dual Chiller Leavin_ Water Sensor If the Dual Chiller
algc_hm is used, and the machines are installed in parallel, a
dual chilled water sensor must be installed tbr each module.
For 30RB315-390, a thctory-supptied thermistor and welt are
shipped in the control box of each module. Install the well in
the colrnnon leaving water header. See Fig. 23.
See page 41 for more dual chiller leaving water sensor
information.
Minimum Loop Volume The preferred minimum loop vol-
ume is dependent on the type of application. In order to obtain
leaving ,a_atertemperature stability for comfort cooling appli-
cations, a minimum of 3 gallons per ton (3.25 liters per kW) is
required on all unit sizes. For process cooling applications,
applications where high stability is critical, or operation at
ambient temperatures below 32 F (0° C) is expected, the loop
volume should be increased to 6 to 10 gallons per ton (6.46 to
10.76 liters per kW) of cooling.
In order to achieve this volume, it may be necessary to add a
water storage tank to the water loop. If a storage tank is added
to the system, it should be properly vented so that the tmlk can
be completely filled and all air eliminated. Failure to do so
could cause lack of pump stability and poor system operation.
Any storage tank that is placed in the water loop should
have internal baffles to allow thorough mixthg of the fluid. See
Fig. 24.
System Pipina Proper system design and installation proce-
dures should be followed closely. The system must be
constructed with pressure tight components and thoroughly
tested for installation leaks. Factory-supplied hydronic packag-
es are available with single or dual (for back-up) pumps. The
thctory-instatled package includes all of the components above
the line in Fig. 20 and 21.
Installation of water systems should follow sound engineer-
ing practice as well as applicable local and industry standards.
Improperly designed or installed systems may cause unsatis-
thctory operation and/or system failure. Consult a water
treatment specialist or appropriate literature for information
regarding filtration, water treannent, and control devices.
Fimlre 20 shows a typical installation with components that
might be installed with the hydronic package of the 30RB unit.
28