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Form 201.28-NM1.1
Issue date: 08/06/2021
A. An appropriate freeze protection fluid selected for
the lowest possible ambient temperature must be
used in the chilled fluid circuit.
......-or-
B. The fluid in the evaporator must be drained by
completing the following steps:
• Remove the power to the water box heaters
• Close the chilled fluid circuit isolation valves
• Drain the evaporator
• Leave the evaporator drain valves open
In applications where a freeze protection fluid is not
used but continuous power to the chiller control panel,
chilled fluid circuit pumps and evaporator heaters can
be guaranteed during periods of subfreezing ambient
temperatures, then one of the freeze damage protec-
tion protocols in the following table must be followed:
Table 11 - YVAA freeze damage protection requirements
Ambient air temperatures from
32⁰F (0⁰C) down to 0⁰F (-17.8⁰C)
Ambient air temperatures below
0⁰F (-17.8⁰C) down to -20⁰F
(-28⁰C)
JOHNSON CONTROLS
Chiller control of chilled fluid
circuit pumps
Required if actuated suction
service isolation valve is not
selected
Required
Actuated suction service
isolation valve
Required if chilled fluid pumps are
not controlled by chiller control
panel
Required
SECTION 6 - COMMISSIONING
Water box immersion heaters
Not required
Required
6
101
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