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10
The nominal chiller design is for 85°F (38.6°C)
condenser cooling water supply. Under normal
operation under full load there will be about a 10°F
(4.5°C) rise through the condenser resulting in 95°F
(43.1°C) exiting water temperature from the
condenser. To ensure proper water flow through the
condenser, the condenser water pump should
provide at least 25 psi (1.7 bar).
Each condenser has a two-way condenser water-
regulating valve. Under varying loads and condenser
inlet water temperatures the amount of cooling
water needed varies. The condenser water-
regulating valve controls the amount of water
allowed to pass through the condenser in order to
maintain proper refrigeration pressures in the circuit.
To prevent damage to the condenser or regulating
valve, the condenser water pressure should not
exceed 150 psig (10.3 bar). The condenser water-
regulating valve controls the condenser water flow in
order to maintain the pressure set point. The chiller
load, condenser-water inlet temperature, and
pressure set point determine the actual flow.
Water Pressure Gauges
It is highly recommended to install pressure gauges
or taps in the inlet and outlet of both the condenser
and evaporator chilled water piping. The ability to
read the pressure drop across the chiller is important
and will aid in preventive maintenance and in
troubleshooting the chiller performance.
Master Temperature Sensor
This section only applies to installations where
multiple chillers are in a common system where one
chiller will be the master with the other chillers
serving as slaves. In those situations, a field-installed
master fluid-temperature sensor is required to be
field installed in the common chilled water supply
and return piping. The sensor ships loose from the
factory. The supply sensor should be installed
downstream of all individual chilled water supply
streams. Position the sensor to read the mixed
supply temperature. The supply sensor will normally
be the control sensor for the chilled water set point
and will determine the loading/unloading of the
compressors of the system.
Mount the sensor in a ½” NPT coupling in a
minimum pipe size of 3”. The probe sheath is ¼” OD
x 3” in length and is equipped with a ½” NPT male
fitting for direct mounting in a coupling. The sensor
is to be direct immersion for the most accurate
reading and quickest response time. If direct
immersion mounting is not possible, mount the
sensor inside a thermowell to aid in maintenance
and or repair of the sensor if opening of the process
piping is not possible. Use a suitable heat transfer
compound with a thermowell. The sensor is
equipped with a NEMA-4 sensor head with an
integral temperature transmitter. Wiring must be
field provided from the sensor head to the chiller
electrical enclosure and landed at the designated
terminal blocks within the enclosure. Please see the
chiller electrical schematic provided for further
detail.