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JOHNSON CONTROLS
56
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
SECTION 5 - COMMISSIONING
PRECAUTIONS FOR THE USE OF WATER
Staining and corrosion of the tubes in the evaporator,
absorber and condenser depends on the quality of the
water used as chilled / hot water and cooling water. As
a result, water quality must be checked periodically to
prevent problems. If water quality is not controlled and
maintained properly, premature tube failure can result.
Causes of bad water quality include:
• polluted seawater
• brackish water
• polluted underground water
• cooling tower located near a chimney or in dirty
air
Be sure to analyze the chilled / hot water,
and the cooling water within one month
after commissioning.
Install strainers of 10 mesh and above to the chilled /
hot water and cooling water inlets.
Shut off valves will be installed in the chilled / hot wa-
ter, cooling water inlets and outlets. Be sure the valves
are completely open when supplying water. If not,
the water flow can become turbulent (at the shut off
valves) and damage the water chamber case and tubes.
When you need to temporarily reduce the quantity of
the chilled / hot water and cooling water use the valves
installed at the outlet line to make adjustments.
When the flow rate change of the chilled / hot water
is controlled (if the flow rate change function is in-
stalled), the load change speed is limited.
• The load change condition to limit the chilled / hot
water temperature at the outlet is ±0.5 °C: 1.5% of
the minimum/maximum.
• The critical load change condition to prevent an
overcooling trip of the chiller-heater is 5% of the
minimum/maximum.
CHILLED / HOT WATER OUTLET
TEMPERATURE CONTROLLER
The chilled / hot water outlet temperature control-
ler (23A) is located on the sequencer. It controls the
chilled / hot water outlet temperature.
LIQUID LEVEL GAUGES
Liquid level gauges are used to check the condition of
the chiller-heater components.
TABLE 15 - LIQUID LEVEL GAUGES (SIGHT
GLASS)
LIQUID LEVEL
GAUGE NAME
SYMBOL FUNCTION
Refrigerant overflow
monitoring level gauge
LG5
Checks refrigerant
overflow level
Refrigerant tank level
gauge
LG4
Checks lower limit of
refrigerant tank level
Absorber level gauge LG1
Checks lower limit of
absorber
HT-GEN level gauge LG3
Checks condition
of solution in high-
temperature generator
LT-GEN level gauge LG2
Checks condition
of solution in low-
temperature generator