Nibe CLIMACOOL UCR 30, Installation, Operation & Maintenance Manual

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As with any water system, it is important that the system
be clean . If care is taken during installation, the possibility
of dirt related problems are avoided in future operation
of the chiller . The pipe work installer must remove weld
scale, rust and contamination during pipe work fabrication .
The system water piping must be flushed thoroughly
with recommended alkaline flush or other chemicals that
are compatible with 316 stainless steel, prior to making
connections to the ClimaCool chiller . There are certain
necessary components that should always be installed in
the chilled water system . (See Figures 13 and 14 on page
20 - Water Piping Configurations). Piping configurations on
multiple modules may also be found on page 20 . All water
piping must be installed in accordance with applicable codes
and standards .
Temperature Sensor and Wells
ClimaCool provides two (2) temperature sensors and wells
with each chiller system programmed by the CoolLogic
Control System . The temperature sensor and wells must be
field installed a minimum of 36” but no more than 60” away
from the bank and before the strainer, on the chilled water
inlet, chilled water outlet (See Water Piping Configuration
on page 20) . Note: Sensors must be fully inserted into
the well to obtain proper readings and must be 2 ½ pipe
diameter minimum before or after an elbow.
Pressure Differential Flow Sensor
It is imperative that minimum and maximum water flow
rates, as defined in the Operational Limitations tables on
page 56, are not exceeded . To prevent operation of the
chiller without sufficient water flow to the evaporator it is
required to install pressure differential flow sensors in the
chilled water circuit, downstream of the strainer on the
inlet and outlet of a straight pipe as close to the module as
possible . Do not put in an elbow on the outlet. (See Water
Piping Configurations on page 20).
Pressure Taps
The installing contractor must provide access ports for
connecting the pressure differential flow sensor and
pressure gauges for the chilled water system. A 1/4” pressure
tap is required on the inlet and the outlet of the chilled
water system for a total of four (4) taps . If a port is shared
by the pressure differential flow sensor and the pressure
gauge it will require two (2) 1/2” taps. (See Water Piping
Configurations – page 20).
Water Isolation Valves
It is recommended to provide bank water isolation valves for
proper isolation and maintenance of the chiller, pump and
strainer (see Water Piping Configurations – page 20).
Strainers – Minimum 60 Mesh Screen Required
ClimaCool chillers employ brazed plate heat exchangers
which are extremely sensitive to debris . Therefore, it is
mandatory that all chilled water systems include a strainer
with a minimum of 60 mesh screen for proper filtration
and be in place at all times while chillers are in operation.
The strainers must be installed as shown in the Water Piping
Configurations on page 20.
ClimaCool’s warranty does not cover and does not apply to
products which have defects or damages due to freezing
of the water supply, an inadequate or interrupted water
supply, corrosives or abrasives in the water supply, or
improper or inadequate filtration or treatment of the
water supply.
Chiller System Water Header Bypass
A bypass is required for any chilled water/evaporator,
hot water/condenser and source water side (geothermal,
cooling tower or closed circuit cooler) with variable
pumping . The bypass must be piped in such a way that
the temperature and differential pressure sensors are
still sensing active flow (see Water Piping - Figures 10 and
11 on page 19) . The purpose of the chiller system bypass
is to prevent deadheading of the pumps when all of the
internal unit valves go closed as well as allow temperature
and differential pressure sensors to sense active flow.
The bypass should be sized for an absolute minimum of
one module’s worth of design flow. (Refer to selection
submittals for design flow rates).
Modules can also be designated for use as an internal
bypass, however, use of a module acting as a bypass can
cause increased wear of heat exchangers due to abrasion
from excessive bypass flow.
ClimaCool offers two types of water header bypass kits,
direct return (Figure 10 on page 19) and reverse return
(Figure 11 on page 19) . The bypass kits must be installed on
each water source loop and controls are integrated with the
CoolLogic software . Installation location can be found on
page 20 – Water Piping Configuration.
Water Piping