JOHNSON CONTROLS
90
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
SECTION 5 - COMMISSIONING
A Earth Leakage Breaker (ELB) is not installed on this
chiller unit. You MUST install an adequate ground fault
circuit breaker at the primary side of the chiller unit.
The Chiller Pre-Start Up and Commissioning Checklist
contains specific information for the installation and
start-up of the unit. The steps and procedures MUST
be performed by a YORK/Johnson Controls Service
person prior to customer use.
All items on the checklist MUST be completed prior to
charging and initial operation. Failure to do this may
result in machine malfunction, damage, and/or injury.
PRECAUTIONS FOR THE USE OF WATER
Staining and corrosion of the tubes in the evaporator,
absorber, generator, and condenser largely depend on
the quality of the water used as chilled water, hot wa-
ter, and cooling water. As a result, water quality must
be checked periodically for stain and corrosion to pre-
vent problems. If water quality is not controlled and
maintained properly, premature tube failure can result.
Causes of bad quality water include:
• Polluted seawater
• Brackish water
• Polluted underground water
• Cooling tower located near a chimney or in dirty
air
NOTE: Be sure to analyze the chilled, hot,
and the cooling water within one month
after commissioning. See Figure 57 on
page 124
Install strainers of 10 mesh and above to the chilled
water and cooling water inlets.
Shut off valves will be installed at the customer site in
the chilled water, cooling water and hot water inlets
and outlets. Be sure the valves are completely open
when suppling water. If not, the water flow can become
turbulent (at the shut off valves) and damage the wa-
ter chamber case and tubes. When you need to reduce
the quantity of the chilled water, cooling water and hot
water temporarily, use the valves to make adjustments.
When the flow rate change of the chilled water is con-
trolled (if the flow rate change function is installed),
the load change speed is limited.
• The load change condition to limit the chilled
water temperature at the outlet is ±0.9°F : 1.5%
minimum/maximum.
• The critical load change condition to prevent an
overcooling trip of the chiller is 5% minimum/
maximum.
Be sure to install a strainer of 20 mesh before the hot
water control valve. If the hot water control valve is
clogged, the hot water flow rate cannot be controlled.
This may cause chiller malfunction.
CHILLED WATER OUTLET TEMPERATURE
CONTROLLER
The chilled water outlet temperature controller is lo-
cated on the sequencer and controls the chilled water
outlet temperature.
LIQUID LEVEL GAUGES
Liquid level gauges are used to check the condition of
the chiller components.
TABLE 24 - LIQUID LEVEL GAUGES
LIQUID LEVEL
GAUGE NAME
SYMBOL FUNCTION
Refrigerant
overow
monitoring level
gauge
G101
Checks refrigerant
overow level
Refrigerant tank
level gauge
G102
Checks lower limit of
refrigerant tank level
Absorber level
gauge
G103
Checks lower limit of
absorber
Condenser level
gauge (EXE type
only)
G104
Checks condition
of refrigerant in
condenser
Generator level
gauge
G105
Checks condition
of solution in low-
temperature generator
START THE CHILLER
Before starting the chiller, inspect the following items:
• Check the hot water supply valve.
• Check that the refrigerant blow valve (V8) is
closed.
• Check the degree of the vacuum in the machine.
Use the pressure gauge of the generator.
• Check the hot water inlet temperature.
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