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SECTION 5 - COMMISSIONING
PRECAUTIONS FOR THE USE OF WATER
Staining and corrosion of the tubes in the evaporator,
absorber, waste hot water-driven generator, and con-
denser depends on the quality of the water used as
chilled / hot water, cooling water, and waste hot 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 re-
sult. 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,
the cooling water, and the waste hot water
within one month after commissioning.
See Table 23 on page 110.
Install strainers of 10 mesh and above to the chilled /
hot water, cooling water, and waste hot water inlets.
Shut off valves will be installed in the chilled / hot
water, cooling water, and waste hot water inlets and
outlets. Be sure the valves are completely open when
supplying water. If not, the water flow can become tur-
bulent (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, cooling
water, and waste hot water use the valves installed at
the outlet line to make adjustments.
50
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.
Be sure to install a strainer of 20 mesh before the waste
hot water control valve. If the waste hot water control
valve is clogged, the waste hot water flow rate cannot
be controlled. This can cause problems for the chiller-
heater.
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 14 - LIQUID LEVEL GAUGES (SIGHT
GLASS)
LIQUID LEVEL
SYMBOL
GAUGE NAME
Refrigerant overflow
monitoring level gauge
Refrigerant tank level
gauge
Absorber level gauge
HT-GEN level gauge
LT-GEN level gauge
FORM 155.33-ICOM2.EN.GB
ISSUE DATE: 12/4/2017
FUNCTION
Checks refrigerant
LG5
overflow level
Checks lower limit of
LG4
refrigerant tank level
Checks lower limit of
LG1
absorber
Checks condition
LG3
of solution in high-
temperature generator
Checks condition
LG2
of solution in low-
temperature generator
JOHNSON CONTROLS
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